/* ==========================================================================
   Modern Calculator Design System (CalculatorBowl)
   ========================================================================== */

:root {
  /* Color Palette - Light Mode */
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-input: #ffffff;
  --border-color: #e2e8f0;
  --border-focus: #4f46e5;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-primary-glow: rgba(79, 70, 229, 0.15);
  --accent-secondary: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 25px rgba(79, 70, 229, 0.2);

  --font-main: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Plus Jakarta Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --container-max: 1240px;
  --transition-fast: 0.12s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0a0e17;
  --bg-surface: #111827;
  --bg-surface-elevated: #1a2234;
  --bg-subtle: #1e293b;
  --bg-input: #151d2e;
  --border-color: #26334d;
  --border-focus: #6366f1;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-primary-glow: rgba(99, 102, 241, 0.25);
  --accent-secondary: #22d3ee;
  --accent-emerald: #34d399;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.45);
  --shadow-xl: 0 24px 36px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 35px rgba(99, 102, 241, 0.3);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* Ambient glow (GPU Accelerated, zero layout-shift) */
body::before {
  content: '';
  position: fixed;
  top: 0;
  right: 0;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle at 100% 0%, var(--accent-primary-glow) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
  transform: translateZ(0);
  will-change: transform;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-primary-hover);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(var(--bg-surface), 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px var(--accent-primary-glow);
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--accent-primary-glow);
  color: var(--accent-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: var(--bg-subtle);
}

.nav-link.active {
  color: var(--accent-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.search-trigger {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 1rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 220px;
}

.search-trigger:hover {
  border-color: var(--accent-primary);
  color: var(--text-secondary);
  background: var(--bg-surface);
}

.search-shortcut {
  margin-left: auto;
  font-size: 0.72rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
}

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

/* ==========================================================================
   Main Layout & Breadcrumbs
   ========================================================================== */
.main-wrapper {
  flex: 1;
  max-width: var(--container-max);
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
}

.breadcrumb-container {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb-item a {
  color: var(--text-secondary);
}

.breadcrumb-item a:hover {
  color: var(--accent-primary);
}

.breadcrumb-separator {
  opacity: 0.5;
  font-size: 0.75rem;
}

.breadcrumb-item.current {
  color: var(--text-primary);
  font-weight: 600;
}

/* ==========================================================================
   Ad Placements
   ========================================================================== */
.ad-slot-container {
  background: var(--bg-surface);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  margin: 1.5rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.ad-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.ad-placeholder-box {
  background: linear-gradient(135deg, var(--bg-subtle) 0%, rgba(79, 70, 229, 0.04) 100%);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  color: var(--text-secondary);
}

.ad-placeholder-box.banner {
  min-height: 90px;
}

.ad-placeholder-box.sidebar {
  min-height: 250px;
}

.ad-placeholder-box.in-content {
  min-height: 120px;
}

.ad-subtext {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Homepage Hero Section with Embedded Basic Calculator
   ========================================================================== */
.home-hero-calc-section {
  display: grid;
  grid-template-columns: minmax(430px, 470px) 1fr;
  gap: 2.5rem;
  align-items: center;
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-lg);
  position: relative;
}

@media (max-width: 1024px) {
  .home-hero-calc-section {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 1.5rem;
  }
}

.home-hero-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.25rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.hero-search-wrapper {
  position: relative;
  width: 100%;
}

.hero-search-input {
  width: 100%;
  padding: 0.95rem 1.25rem 0.95rem 3.2rem;
  font-size: 1rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  outline: none;
  transition: all var(--transition-normal);
}

.hero-search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

.hero-search-icon {
  position: absolute;
  left: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.15rem;
  pointer-events: none;
}

.search-results-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 0.5rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: 50;
  max-height: 350px;
  overflow-y: auto;
  display: none;
  text-align: left;
}

.search-result-item {
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-fast);
  cursor: pointer;
}

.search-result-item:hover {
  background: var(--bg-subtle);
}

.search-result-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.search-result-name {
  font-weight: 600;
  color: var(--text-primary);
}

.search-result-cluster {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.quick-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.65rem;
}

.quick-tool-card {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.7rem 0.85rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.quick-tool-card:hover {
  background: var(--accent-primary-glow);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

/* ==========================================================================
   Basic Standard Handheld Calculator Case & Keypad (Optimized Sizing)
   ========================================================================== */
.basic-calc-case {
  background: var(--bg-surface-elevated);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem 1.6rem;
  box-shadow: 0 16px 36px -6px rgba(0, 0, 0, 0.12), 0 6px 12px -2px rgba(0, 0, 0, 0.05);
  width: 100%;
  max-width: 470px;
}

.basic-calc-screen {
  background: #080d1a;
  border: 2px solid #1a2333;
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.4rem;
  margin-bottom: 1.4rem;
  text-align: right;
  box-shadow: inset 0 3px 10px rgba(0, 0, 0, 0.8), 0 1px 0 rgba(255, 255, 255, 0.05);
  min-height: 105px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.basic-screen-indicators {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 20px;
}

.basic-screen-history {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: #64748b;
  font-weight: 500;
}

.basic-screen-main {
  font-family: var(--font-mono);
  font-size: 2.75rem;
  font-weight: 800;
  color: #38bdf8;
  letter-spacing: -0.02em;
  line-height: 1.15;
  overflow-x: auto;
  white-space: nowrap;
  text-shadow: 0 0 15px rgba(56, 189, 248, 0.35);
}

.basic-calc-keypad {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.75rem;
}

.calc-key {
  height: 56px;
  font-family: var(--font-main);
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 12px;
  border: 1.5px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.12s ease;
  user-select: none;
  box-shadow: 0 3px 0 var(--border-color);
}

.calc-key:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 0 var(--border-color);
  border-color: var(--accent-primary);
}

.calc-key:active {
  transform: translateY(3px);
  box-shadow: none;
}

.calc-key.key-num {
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 1.35rem;
  font-weight: 700;
}

.calc-key.key-num:hover {
  background: var(--bg-subtle);
}

.calc-key.key-op {
  background: var(--accent-primary-glow);
  color: var(--accent-primary);
  border-color: rgba(79, 70, 229, 0.35);
  font-size: 1.45rem;
  font-weight: 700;
  box-shadow: 0 3px 0 rgba(79, 70, 229, 0.25);
}

.calc-key.key-op:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.calc-key.key-fn {
  background: var(--bg-subtle);
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 700;
}

.calc-key.key-mem {
  background: var(--bg-subtle);
  color: var(--accent-emerald);
  font-size: 0.95rem;
  font-weight: 800;
  border-color: rgba(16, 185, 129, 0.25);
}

.calc-key.key-clear {
  background: rgba(244, 63, 94, 0.1);
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.35);
  font-size: 1.15rem;
  box-shadow: 0 3px 0 rgba(244, 63, 94, 0.2);
}

.calc-key.key-clear:hover {
  background: var(--accent-rose);
  color: #ffffff;
}

.calc-key.key-equals {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  color: #ffffff;
  border: 1.5px solid transparent;
  font-size: 1.65rem;
  font-weight: 800;
  box-shadow: 0 3px 0 #3730a3, 0 6px 16px var(--accent-primary-glow);
}

.calc-key.key-equals:hover {
  filter: brightness(1.1);
  box-shadow: 0 5px 0 #3730a3, 0 8px 20px var(--accent-primary-glow);
}

/* ==========================================================================
   CalculatorSoup-style Homepage 2-Column Directory Layout
   ========================================================================== */
.home-directory-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 960px) {
  .home-directory-layout {
    grid-template-columns: 1fr;
  }
}

.directory-category-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  transition: all var(--transition-normal);
}

.directory-category-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

.directory-cat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1.5px solid var(--border-color);
  padding-bottom: 0.85rem;
  margin-bottom: 1rem;
}

.directory-cat-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.directory-cat-title a {
  color: var(--text-primary);
}

.directory-cat-title a:hover {
  color: var(--accent-primary);
}

.directory-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.5rem 1rem;
  list-style: none;
}

.directory-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.directory-item a:hover {
  background: var(--bg-subtle);
  color: var(--accent-primary);
  transform: translateX(3px);
}

.directory-item-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--bg-subtle);
  color: var(--text-muted);
}

.directory-item a:hover .directory-item-badge {
  background: var(--accent-primary-glow);
  color: var(--accent-primary);
}

.directory-view-all {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-primary);
}

/* Popular Tools Box on Sidebar */
.popular-tools-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.popular-tool-item a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  background: var(--bg-subtle);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.popular-tool-item a:hover {
  border-color: var(--accent-primary);
  background: var(--bg-surface);
  color: var(--accent-primary);
  transform: translateX(4px);
}

/* ==========================================================================
   Category & Detail Page Layout
   ========================================================================== */
.clusters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.cluster-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.cluster-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent-primary);
}

.cluster-card-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.cluster-card-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  color: var(--text-secondary);
}

.cluster-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.calculator-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 960px) {
  .calculator-layout {
    grid-template-columns: 1fr;
  }
}

.calculator-card-main {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.calc-header {
  padding: 1.75rem 2rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.calc-cluster-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.calc-title {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.calc-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.calc-body {
  padding: 2rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.form-label-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}

.input-with-addon {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-input);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.input-with-addon:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.input-addon {
  padding: 0.75rem 0.9rem;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  border-right: 1px solid var(--border-color);
  user-select: none;
}

.input-addon.suffix {
  border-right: none;
  border-left: 1px solid var(--border-color);
}

.input-with-unit {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-input);
  overflow: hidden;
  transition: all var(--transition-fast);
  width: 100%;
}

.input-with-unit:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.input-unit {
  padding: 0.75rem 1rem;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.88rem;
  border-left: 1px solid var(--border-color);
  white-space: nowrap;
  user-select: none;
  display: flex;
  align-items: center;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

.form-control:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.input-with-addon .form-control,
.input-with-unit .form-control {
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none !important;
}

.form-select, select.form-control {
  width: 100%;
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  background-color: var(--bg-input);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem;
  cursor: pointer;
}

.form-select:focus, select.form-control:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.form-range {
  width: 100%;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  outline: none;
  accent-color: var(--accent-primary);
  cursor: pointer;
  margin: 0.4rem 0;
}

.range-live-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: var(--accent-primary-glow);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: block;
  margin-top: 0.25rem;
}

.btn-block {
  width: 100%;
  display: flex;
  justify-content: center;
}

.calc-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-primary-hover) 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--accent-primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-primary-glow);
}

.btn-secondary {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
}

/* Results & Steps */
.results-section {
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  background: var(--bg-surface-elevated);
}

.result-hero-box {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(6, 182, 212, 0.05) 100%);
  border: 1.5px solid var(--accent-primary-glow);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.result-hero-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
}

.result-hero-value {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.result-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.result-stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
}

.result-stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.result-stat-val {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.steps-wrapper {
  margin-top: 2rem;
}

.steps-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.steps-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.step-card:hover {
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent-secondary);
}

.step-num-badge {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: 0.35rem;
  display: inline-block;
}

.step-content {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.6;
}

.math-formula-box {
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin: 0.6rem 0;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--accent-primary);
  overflow-x: auto;
  display: inline-block;
}

.math-fraction {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
  text-align: center;
  font-family: var(--font-mono);
  padding: 0 0.25rem;
}

.fraction-numerator {
  border-bottom: 1.5px solid currentColor;
  padding-bottom: 2px;
}

.fraction-denominator {
  padding-top: 2px;
}

.chart-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 1.75rem;
}

/* Sidebar */
.cluster-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-widget {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.widget-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}

.pillar-hub-badge {
  background: var(--accent-primary-glow);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  color: var(--accent-primary);
  font-weight: 600;
  font-size: 0.88rem;
  transition: all var(--transition-fast);
}

.pillar-hub-badge:hover {
  background: var(--accent-primary);
  color: #fff;
}

.related-calcs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.related-calc-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.related-calc-link:hover, .related-calc-link.active {
  background: var(--bg-subtle);
  color: var(--accent-primary);
  transform: translateX(3px);
}

/* In-Content SEO & FAQ */
.calc-seo-content {
  margin-top: 3rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
}

.seo-content-title {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.seo-content-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.in-text-link {
  font-weight: 600;
  color: var(--accent-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: all var(--transition-fast);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
  background: var(--accent-primary-glow);
}

.in-text-link:hover {
  background: var(--accent-primary);
  color: #ffffff;
  text-decoration: none;
}

.contextual-guide-card {
  background: linear-gradient(135deg, var(--bg-subtle) 0%, rgba(79, 70, 229, 0.04) 100%);
  border: 1.5px solid var(--border-color);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin: 2rem 0;
}

.contextual-guide-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.contextual-guide-body {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.suggested-matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.suggested-matrix-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.suggested-matrix-card:hover {
  border-color: var(--accent-primary);
  background: var(--bg-surface-elevated);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
  color: var(--accent-primary);
}

/* Rich Content Infographic Cards & Tables */
.content-infographic-card {
  background: var(--bg-surface-elevated);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}

.infographic-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.infographic-badge {
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--accent-primary-glow);
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.infographic-header h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.infographic-caption {
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-primary);
  margin-top: 1rem;
  line-height: 1.5;
}

/* SEO Interactive Diagram Containers */
.seo-diagram-container {
  width: 100%;
  margin: 1.5rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.seo-diagram-container:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.seo-diagram-container svg {
  display: block;
  width: 100%;
  height: auto;
}

/* Formula Callouts & Math Notation */
.formula-callout {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.06) 0%, rgba(6, 182, 212, 0.04) 100%);
  border: 1.5px solid rgba(79, 70, 229, 0.2);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.formula-label {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-primary);
  margin-bottom: 0.4rem;
}

.formula-eq {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
  margin-bottom: 0.4rem;
}

.formula-expl {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Comparison Matrix Tables */
.comparison-matrix-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  background: var(--bg-surface);
}

.comparison-matrix-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.comparison-matrix-table th {
  background: var(--bg-subtle);
  padding: 0.85rem 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 2px solid var(--border-color);
  font-family: var(--font-heading);
  letter-spacing: 0.01em;
}

.comparison-matrix-table td {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  vertical-align: middle;
}

.comparison-matrix-table tr:last-child td {
  border-bottom: none;
}

.comparison-matrix-table tr:hover td {
  background: rgba(79, 70, 229, 0.03);
}

.comparison-matrix-table tr.matrix-highlight td {
  background: var(--accent-primary-glow);
  font-weight: 600;
  color: var(--text-primary);
}

/* Matrix Badges */
.matrix-badge-green {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.matrix-badge-blue {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(59, 130, 246, 0.12);
  color: #2563eb;
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.matrix-badge-amber {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(245, 158, 11, 0.12);
  color: #d97706;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.matrix-badge-rose {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(244, 63, 94, 0.12);
  color: #e11d48;
  border: 1px solid rgba(244, 63, 94, 0.25);
}

.matrix-badge-purple {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  background: rgba(168, 85, 247, 0.12);
  color: #9333ea;
  border: 1px solid rgba(168, 85, 247, 0.25);
}

[data-theme="dark"] .matrix-badge-green {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
}
[data-theme="dark"] .matrix-badge-blue {
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
}
[data-theme="dark"] .matrix-badge-amber {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
}
[data-theme="dark"] .matrix-badge-rose {
  background: rgba(244, 63, 94, 0.2);
  color: #fb7185;
}
[data-theme="dark"] .matrix-badge-purple {
  background: rgba(168, 85, 247, 0.2);
  color: #c084fc;
}

.content-subheading {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.75rem 0 0.75rem;
  letter-spacing: -0.01em;
}

.content-list, .content-ordered-list {
  padding-left: 1.4rem;
  margin: 0.75rem 0 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  line-height: 1.6;
}

.content-table-wrapper {
  overflow-x: auto;
  margin: 1.25rem 0 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.content-data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.content-data-table th {
  background: var(--bg-subtle);
  padding: 0.75rem 1rem;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 2px solid var(--border-color);
}

.content-data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.content-data-table tr:last-child td {
  border-bottom: none;
}

.content-data-table tr:hover td {
  background: var(--bg-subtle);
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-subtle);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1rem 1.25rem;
  background: transparent;
  border: none;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-answer {
  padding: 0 1.25rem 1rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   CalculatorSoup-Style Clean Footer
   ========================================================================== */
.soup-style-footer {
  background: var(--bg-surface);
  border-top: 1.5px solid var(--border-color);
  padding: 2.25rem 1.5rem 2rem;
  margin-top: auto;
  text-align: center;
}

.soup-footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.soup-footer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  align-items: center;
}

.soup-footer-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  font-size: 0.95rem;
}

.soup-link {
  color: #0056b3;
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

[data-theme="dark"] .soup-link {
  color: #60a5fa;
}

.soup-link:hover {
  color: var(--accent-primary);
  opacity: 0.85;
}

.soup-divider {
  color: var(--text-muted);
  font-size: 0.85rem;
  user-select: none;
  opacity: 0.7;
}

.soup-footer-copyright {
  margin-top: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  width: 100%;
  max-width: 600px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   CalculatorSoup-Style Alphabetical (A–Z) Calculator List Directory
   ========================================================================== */
.az-directory-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.az-index-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.35rem 0.6rem;
  padding: 1rem 1.25rem;
  background: var(--bg-subtle);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin: 1.5rem 0 2.5rem;
}

.az-letter-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-decoration: none;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.az-letter-link:hover {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.az-letter-link.disabled {
  opacity: 0.35;
  pointer-events: none;
  background: transparent;
  border-color: transparent;
  color: var(--text-muted);
}

.az-letter-group {
  margin-bottom: 2.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  scroll-margin-top: 5rem;
}

.az-letter-group:last-child {
  border-bottom: none;
}

.az-letter-heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--accent-primary);
  margin-bottom: 1rem;
}

.az-letter-heading-badge {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.az-calc-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 0.85rem 1.5rem;
  margin: 0;
  padding: 0;
}

.az-calc-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  line-height: 1.5;
}

.az-calc-link {
  font-size: 0.96rem;
  font-weight: 600;
  color: #0056b3;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

[data-theme="dark"] .az-calc-link {
  color: #60a5fa;
}

.az-calc-link:hover {
  color: var(--accent-primary);
}

.az-calc-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  white-space: nowrap;
}

.az-calc-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.feedback-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.feedback-input, .feedback-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.feedback-input:focus, .feedback-textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-glow);
}

.feedback-btn {
  align-self: flex-start;
  padding: 0.75rem 1.5rem;
  background: var(--accent-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.feedback-btn:hover {
  opacity: 0.9;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.25s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* ==========================================================================
   Multilingual (i18n) & Language Selector Styles
   ========================================================================== */
.lang-selector-wrapper {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--accent-primary);
  box-shadow: 0 0 12px var(--accent-primary-glow);
}

.lang-flag {
  font-size: 1.1rem;
  line-height: 1;
}

.lang-name-code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.lang-arrow {
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.lang-btn[aria-expanded="true"] .lang-arrow {
  transform: rotate(180deg);
}

.lang-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 280px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 1000;
  overflow: hidden;
  animation: fadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.lang-dropdown-header {
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-subtle);
}

.lang-dropdown-title {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
}

.lang-search-box {
  width: 100%;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.82rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.lang-search-box:focus {
  border-color: var(--accent-primary);
}

.lang-list-scroll {
  max-height: 280px;
  overflow-y: auto;
  padding: 0.4rem;
}

.lang-list-scroll::-webkit-scrollbar {
  width: 5px;
}
.lang-list-scroll::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.lang-option-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.65rem;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.85rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-option-btn:hover {
  background: var(--bg-subtle);
  color: var(--accent-primary);
}

.lang-option-btn.active {
  background: var(--accent-primary-glow);
  color: var(--accent-primary);
  font-weight: 600;
}

.lang-opt-flag {
  font-size: 1.1rem;
}

.lang-opt-name {
  font-weight: 500;
}

.lang-opt-native {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.lang-opt-check {
  color: var(--accent-primary);
  font-weight: bold;
  margin-left: 0.4rem;
}

.lang-no-match {
  padding: 1rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* RTL Support (Arabic) */
[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

[dir="rtl"] .lang-dropdown-menu {
  right: auto;
  left: 0;
}

[dir="rtl"] .search-shortcut {
  margin-left: 0;
  margin-right: auto;
}

[dir="rtl"] .lang-opt-native {
  margin-left: 0;
  margin-right: auto;
}

/* Hide Google Translate toolbar bar to preserve custom design */
.goog-te-banner-frame.skiptranslate,
.goog-te-banner-frame {
  display: none !important;
}

body {
  top: 0px !important;
  position: static !important;
}

.goog-te-gadget {
  display: none !important;
}

.goog-tooltip,
.goog-tooltip:hover {
  display: none !important;
}

.goog-text-highlight {
  background-color: transparent !important;
  box-shadow: none !important;
}

/* ==========================================================================
   A–Z Calculator Directory Styles
   ========================================================================== */
.az-directory-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.5rem 0 3rem;
}

.az-index-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  padding: 0.75rem 1rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 2rem;
  position: sticky;
  top: 70px;
  z-index: 20;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.az-letter-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  padding: 0 0.4rem;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  text-decoration: none;
  background: var(--bg-subtle);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.az-letter-link:hover {
  background: var(--accent-primary);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--accent-primary-glow);
}

.az-letter-link.disabled {
  opacity: 0.3;
  pointer-events: none;
  background: transparent;
}

.az-letter-group {
  margin-bottom: 2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast);
}

.az-letter-group:hover {
  border-color: var(--accent-primary-glow);
}

.az-letter-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
}

.az-letter-char {
  font-size: 1.6rem;
  font-weight: 800;
  font-family: var(--font-heading);
  color: var(--accent-primary);
  line-height: 1;
}

.az-letter-heading-badge {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-color);
}

.az-calc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.5rem 1.5rem;
}

.az-calc-item {
  display: block;
}

.az-calc-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  width: 100%;
}

.az-calc-bullet {
  color: var(--accent-primary);
  font-size: 1.1rem;
  line-height: 1;
  transition: transform var(--transition-fast);
}

.az-calc-link:hover {
  color: var(--accent-primary);
  background: var(--bg-subtle);
  transform: translateX(3px);
}

.az-calc-link:hover .az-calc-bullet {
  transform: scale(1.3);
}

@media (max-width: 768px) {
  .az-index-bar {
    top: 60px;
    padding: 0.5rem;
    gap: 0.25rem;
  }
  .az-letter-link {
    min-width: 1.65rem;
    height: 1.65rem;
    font-size: 0.78rem;
  }
  .az-calc-list {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
  .az-letter-group {
    padding: 1rem;
  }
}

/* ==========================================================================
   Network & Speed Test Utilities Styles
   ========================================================================== */

.speedtest-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

.speedtest-header-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.speedtest-isp-info,
.speedtest-server-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.st-isp-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.st-isp-details {
  display: flex;
  flex-direction: column;
}

.st-isp-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.st-isp-val {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.speedtest-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.st-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
}

.speedtest-status-badge.testing .st-status-dot {
  background: #f59e0b;
  animation: pingPulse 1.2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes pingPulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 6px rgba(245, 158, 11, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
}

.speedtest-gauge-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.speedometer-container {
  position: relative;
  width: 100%;
  max-width: 380px;
  display: flex;
  justify-content: center;
}

.speedometer-svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

.gauge-tick-label {
  font-size: 11px;
  font-weight: 600;
  fill: var(--text-muted);
  text-anchor: middle;
}

.speedometer-digital-readout {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.digital-speed-val {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-primary);
  letter-spacing: -0.04em;
}

.digital-speed-unit {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.digital-phase-badge {
  font-size: 0.72rem;
  font-weight: 800;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--accent-primary);
  border: 1px solid var(--border-color);
  letter-spacing: 0.05em;
}

.speedtest-action-area {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 400px;
}

.btn-speedtest-start {
  position: relative;
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-full);
  padding: 1rem 2.5rem;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 8px 24px -4px rgba(79, 70, 229, 0.4);
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-speedtest-start:hover:not(:disabled) {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 12px 28px -4px rgba(79, 70, 229, 0.5);
}

.btn-speedtest-start:disabled {
  opacity: 0.85;
  cursor: not-allowed;
}

.gauge-track-bg {
  stroke: var(--border-color);
  transition: stroke var(--transition-normal);
}

.gauge-track-active {
  transition: stroke-dashoffset 0.15s ease-out;
}

.gauge-ticks text, .gauge-tick-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  fill: var(--text-muted);
  text-anchor: middle;
}

.gauge-needle-polygon {
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.3));
}

.btn-start-content {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  position: relative;
  z-index: 2;
}

.btn-start-icon {
  font-size: 1.2rem;
}

.btn-start-text {
  font-weight: 800;
  letter-spacing: 0.04em;
}

.btn-start-pulse {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: var(--radius-full);
  background: var(--accent-primary);
  opacity: 0.4;
  animation: startPulse 2s infinite;
  z-index: 1;
}

@keyframes startPulse {
  0% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(1.08); opacity: 0; }
  100% { transform: scale(1); opacity: 0; }
}

.st-metric-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.data-cap-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
}

.btc-tab-content, .gold-tab-content, .ratio-tab-content {
  display: block;
  animation: fadeIn 0.25s ease-in;
}

.featured {
  position: relative;
}

.featured::after {
  content: '★ POPULAR';
  position: absolute;
  top: -8px;
  right: 12px;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 0.15rem 0.45rem;
  background: linear-gradient(135deg, var(--accent-amber), #ea580c);
  color: #fff;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 6px rgba(234, 88, 12, 0.3);
}

.speedtest-progress-wrapper {
  width: 100%;
  margin-top: 1.25rem;
}

.speedtest-progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.speedtest-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, #6366f1, #ec4899);
  transition: width 0.3s ease;
}

.speedtest-progress-label {
  font-size: 0.82rem;
  text-align: center;
  margin-top: 0.4rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.speedtest-metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  width: 100%;
}

.st-metric-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.st-metric-card.active-ping,
.st-metric-card.active-download,
.st-metric-card.active-upload {
  border-color: var(--accent-primary);
  background: var(--bg-subtle);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
  transform: translateY(-2px);
}

.st-metric-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.st-metric-value-row {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.st-metric-number {
  font-family: var(--font-heading);
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
}

.st-metric-unit {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.st-metric-footer {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.speedtest-rating-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.st-rating-heading {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.st-ratings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.st-rating-item {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.st-rating-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.st-rating-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.st-rating-badge {
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}

.st-rating-badge.grade-s {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.st-rating-badge.grade-a {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.st-rating-badge.grade-b {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.st-rating-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
  margin: 0;
}

.st-result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: flex-end;
}

/* Streaming & Data Usage Styles */
.data-cap-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-top: 1rem;
}

.data-cap-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.data-cap-percent {
  color: var(--accent-primary);
}

.data-cap-bar-track {
  width: 100%;
  height: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.data-cap-bar-fill {
  height: 100%;
  transition: width 0.3s ease;
}

.data-cap-status {
  font-size: 0.8rem;
  line-height: 1.4;
}

.plan-recommendation-box {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(168, 85, 247, 0.08) 100%);
  border: 1.5px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-top: 1rem;
}

.plan-rec-header {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.plan-rec-icon {
  font-size: 1.35rem;
}

.plan-rec-title {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.plan-rec-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* ==========================================================================
   Calculator Grid & Two-Column Panels
   ========================================================================== */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  margin-bottom: 2rem;
  align-items: start;
}

@media (max-width: 960px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}

.calc-input-panel, .calc-result-panel {
  background: var(--bg-surface-elevated);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transition: all var(--transition-normal);
}

.calc-input-panel:hover, .calc-result-panel:hover {
  border-color: rgba(79, 70, 229, 0.3);
  box-shadow: var(--shadow-lg);
}

.panel-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1.5px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ==========================================================================
   Hero Results Card & Sub-Metrics Row
   ========================================================================== */
.result-hero-card {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(6, 182, 212, 0.06) 100%);
  border: 1.5px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px var(--accent-primary-glow);
}

.result-hero-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.result-hero-value {
  font-family: var(--font-heading);
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1.1;
  margin-bottom: 0.25rem;
  text-shadow: 0 2px 10px var(--accent-primary-glow);
}

.result-hero-sub {
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.result-metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
}

.result-metric-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.result-metric-box:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

.metric-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.result-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.result-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.result-value {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
}

.result-subtext {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Step-by-Step Breakdown & Math Equations
   ========================================================================== */
.step-breakdown-card {
  background: var(--bg-surface-elevated);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  margin-top: 2rem;
}

.step-breakdown-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.formula-box {
  background: var(--bg-subtle);
  border: 1.5px dashed var(--accent-primary);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent-primary);
  font-weight: 600;
  overflow-x: auto;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.step-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-size: 0.95rem;
  line-height: 1.6;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.step-item:hover {
  border-left-color: var(--accent-secondary);
  box-shadow: var(--shadow-md);
  transform: translateX(3px);
}

.step-item strong {
  display: block;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.step-item p {
  margin: 0;
  color: var(--text-secondary);
}

.step-badge {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--accent-primary);
  background: var(--accent-primary-glow);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  display: inline-block;
  margin-bottom: 0.35rem;
}

.step-solution-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1rem;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   Data Tables & Matrices
   ========================================================================== */
.data-table-container, .table-responsive {
  background: var(--bg-surface-elevated);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  margin-top: 2rem;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.92rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.data-table th {
  background: var(--bg-subtle);
  color: var(--text-primary);
  font-weight: 700;
  text-align: left;
  padding: 0.9rem 1.15rem;
  border-bottom: 2px solid var(--border-color);
  font-family: var(--font-heading);
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.data-table td {
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  background: var(--bg-surface);
  transition: background var(--transition-fast);
  vertical-align: middle;
}

.data-table tbody tr:hover td {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.amortization-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  margin-top: 1.5rem;
}

/* ==========================================================================
   Tabs, Pills & Specialty Controls (Bitcoin, Gold, Weather, Tip, Ratio)
   ========================================================================== */
.btc-nav-tab, .gold-nav-tab, .ratio-tab-btn {
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.88rem;
  border: 1.5px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  user-select: none;
}

.btc-nav-tab:hover, .gold-nav-tab:hover, .ratio-tab-btn:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.btc-nav-tab.active, .gold-nav-tab.active, .ratio-tab-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 4px 12px var(--accent-primary-glow);
}

.btc-pill-card, .karat-pill-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btc-pill-card:hover, .karat-pill-card:hover {
  border-color: var(--accent-primary);
  background: var(--bg-surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.candle-tf-btn, .btc-candle-tf-btn, .chart-mode-btn, .btc-chart-mode-btn, .chart-period-btn, .btc-chart-period-btn {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.candle-tf-btn.active, .btc-candle-tf-btn.active, .chart-mode-btn.active, .btc-chart-mode-btn.active, .chart-period-btn.active, .btc-chart-period-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.tip-preset-btn {
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.9rem;
  border: 1.5px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex: 1;
  text-align: center;
}

.tip-preset-btn:hover, .tip-preset-btn.active {
  border-color: var(--accent-primary);
  background: var(--accent-primary-glow);
  color: var(--accent-primary);
}

.live-pulse-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 800;
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  animation: pulseGlow 1.5s infinite;
}

@keyframes pulseGlow {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.daily-forecast-card, .hourly-forecast-pill, .weather-metric-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.weather-metric-icon, .st-metric-icon, .st-rating-icon {
  font-size: 1.25rem;
}

.quick-city-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-city-badge:hover {
  background: var(--accent-primary-glow);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.search-city-option {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-city-option:hover {
  background: var(--bg-subtle);
}

.calc-tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: all var(--transition-normal);
}

.calc-tool-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.az-calc-name {
  font-weight: 700;
  color: var(--text-primary);
}

.currency-symbol {
  font-weight: 700;
  color: var(--accent-primary);
}

@media print {
  .site-header, .site-footer, .ad-slot-container, .cluster-sidebar, .theme-toggle-btn, .search-trigger, .lang-selector-wrapper, .btn {
    display: none !important;
  }
  body {
    background: #fff !important;
    color: #000 !important;
  }
  .calculator-layout {
    grid-template-columns: 1fr !important;
  }
}