/* ==========================================================================
   Mehvi — Read Time Calculator for Articles & Blogs
   Stylesheet: style.css
   Pure CSS3 with custom variables, 3D perspective, responsive grid & accessibility
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Variables & Design Tokens
   -------------------------------------------------------------------------- */
:root {
  --primary: #2563EB;          /* Royal Blue */
  --primary-hover: #1D4ED8;
  --primary-light: #EFF6FF;
  --primary-glow: rgba(37, 99, 235, 0.15);
  
  --secondary: #06B6D4;        /* Teal / Cyan */
  --secondary-hover: #0891B2;
  --secondary-light: #ECFEFF;
  --secondary-glow: rgba(6, 182, 212, 0.15);

  --bg-page: #F3F4F6;          /* Light Gray */
  --card-bg: #FFFFFF;          /* Pure White */
  --card-subtle: #F9FAFB;
  
  --text-main: #1F2937;        /* Charcoal Dark */
  --text-muted: #4B5563;
  --text-subtle: #6B7280;
  --text-light: #9CA3AF;
  
  --border-color: #E5E7EB;
  --border-subtle: #F3F4F6;
  --border-focus: #2563EB;
  
  --success: #059669;
  --success-light: #ECFDF5;
  --warning: #D97706;
  --warning-light: #FFFBEB;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 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, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.09), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-pill: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 220ms cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1200px;
}

/* --------------------------------------------------------------------------
   2. Reset & Global Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img, svg {
  display: block;
  max-width: 100%;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

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

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

/* Accessibility Focus Ring */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Skip link for keyboard accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 1000;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

/* --------------------------------------------------------------------------
   3. Navbar
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: box-shadow var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
  gap: 1.5rem;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-logo-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.15rem;
  box-shadow: 0 4px 8px var(--primary-glow);
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-text span {
  color: var(--primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  padding: 0.25rem 0;
  position: relative;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--primary);
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: #ffffff;
  padding: 0.5rem 1.125rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.nav-cta-btn:hover {
  background: var(--primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
}

.hamburger-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
}

.hamburger-btn:focus-visible {
  outline: 2px solid var(--primary);
}

.hamburger-icon {
  width: 1.5rem;
  height: 1.5rem;
}

/* --------------------------------------------------------------------------
   4. Hero Section & 3D Visual
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 3.5rem 0 3rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3rem;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
  border: 1px solid rgba(37, 99, 235, 0.15);
}

.hero-title {
  font-size: clamp(2.25rem, 4vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  text-wrap: balance;
}

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

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 38rem;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--primary);
  color: #fff;
  padding: 0.875rem 1.625rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--primary-glow);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: #fff;
  color: var(--text-main);
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--secondary);
  background-color: var(--secondary-light);
  color: var(--secondary-hover);
  transform: translateY(-2px);
}

.hero-badges-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero-badge-item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.hero-badge-item svg {
  color: var(--success);
  flex-shrink: 0;
}

/* 3D Visual Stage */
.hero-visual-stage {
  perspective: 1200px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 380px;
}

.glow-backdrop {
  position: absolute;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, var(--secondary-glow) 0%, var(--primary-glow) 60%, transparent 80%);
  filter: blur(40px);
  z-index: 1;
  pointer-events: none;
}

.visual-3d-scene {
  position: relative;
  width: 100%;
  max-width: 380px;
  transform-style: preserve-3d;
  transform: rotateX(12deg) rotateY(-14deg) rotateZ(2deg);
  animation: floatScene 6s ease-in-out infinite alternate;
  z-index: 2;
}

@keyframes floatScene {
  0% {
    transform: rotateX(12deg) rotateY(-14deg) rotateZ(2deg) translateY(0px);
  }
  100% {
    transform: rotateX(15deg) rotateY(-10deg) rotateZ(3deg) translateY(-14px);
  }
}

.tablet-mockup {
  background: #ffffff;
  border: 2px solid rgba(229, 231, 235, 0.8);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.18), 0 0 0 1px rgba(255, 255, 255, 0.8);
  transform: translateZ(10px);
}

.tablet-screen {
  background: var(--card-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  border: 1px solid var(--border-color);
}

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

.article-title-placeholder {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
}

.article-meta-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.article-lines-preview {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.text-skeleton {
  height: 0.55rem;
  background: #E5E7EB;
  border-radius: var(--radius-pill);
}

.text-skeleton.w-90 { width: 90%; }
.text-skeleton.w-100 { width: 100%; }
.text-skeleton.w-75 { width: 75%; }
.text-skeleton.w-60 { width: 60%; }

/* Floating 3D Depth Badges */
.floating-3d-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transform-style: preserve-3d;
  pointer-events: none;
}

.card-top-right {
  top: -1.25rem;
  right: -1.5rem;
  transform: translateZ(55px);
  border-left: 3px solid var(--primary);
}

.card-bottom-left {
  bottom: -1.25rem;
  left: -1.5rem;
  transform: translateZ(70px);
  border-left: 3px solid var(--secondary);
}

.badge-icon {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.badge-icon.blue {
  background: var(--primary-light);
  color: var(--primary);
}

.badge-icon.cyan {
  background: var(--secondary-light);
  color: var(--secondary-hover);
}

.badge-content {
  display: flex;
  flex-direction: column;
}

.badge-val {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.badge-lbl {
  font-size: 0.6875rem;
  color: var(--text-subtle);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   5. Calculator Section & Dashboard
   -------------------------------------------------------------------------- */
.calculator-section {
  padding: 2.5rem 0 4.5rem;
  scroll-margin-top: 5rem;
}

.calc-container {
  background: var(--card-bg);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  padding: 2rem;
}

.calc-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.calc-title-group h2 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.calc-title-group p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.calc-quick-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn-utility {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--card-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-utility:hover {
  background: #fff;
  border-color: var(--primary);
  color: var(--primary);
}

.btn-utility.danger:hover {
  border-color: #EF4444;
  color: #DC2626;
  background: #FEF2F2;
}

/* Textarea Box */
.calc-input-box {
  position: relative;
  margin-bottom: 1.5rem;
}

.calc-textarea {
  width: 100%;
  min-height: 240px;
  padding: 1.25rem;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-main);
  background: #FFFFFF;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  resize: vertical;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.calc-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.calc-textarea::placeholder {
  color: var(--text-light);
  line-height: 1.6;
}

.textarea-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-subtle);
  padding: 0 0.25rem;
}

.privacy-notice {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.privacy-notice svg {
  color: var(--success);
}

.live-char-indicator {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--text-muted);
}

/* Speed Controls Bar */
.speed-control-bar {
  background: var(--card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 2rem;
}

.speed-control-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.875rem;
}

.speed-control-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
}

.speed-control-desc {
  font-size: 0.8125rem;
  color: var(--text-subtle);
}

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

.speed-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 0.75rem 1rem;
  background: #ffffff;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.speed-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.speed-btn.active {
  background: var(--primary-light);
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary);
}

.speed-btn-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
}

.speed-btn.active .speed-btn-label {
  color: var(--primary);
}

.speed-btn-wpm {
  font-size: 0.75rem;
  color: var(--text-subtle);
  font-variant-numeric: tabular-nums;
}

/* Custom Speed Input Box */
.custom-speed-box {
  display: none;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border-color);
  align-items: center;
  gap: 1rem;
}

.custom-speed-box.show {
  display: flex;
  flex-wrap: wrap;
}

.custom-speed-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.custom-speed-input-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.custom-speed-input {
  width: 6.5rem;
  padding: 0.45rem 0.65rem;
  font-size: 0.9375rem;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  text-align: center;
}

.custom-speed-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.custom-speed-error {
  display: none;
  color: #DC2626;
  font-size: 0.8125rem;
  font-weight: 500;
}

/* Results Section Layout */
.results-dashboard {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.primary-result-card {
  background: linear-gradient(135deg, #1E40AF 0%, #2563EB 50%, #06B6D4 100%);
  color: #ffffff;
  border-radius: var(--radius-xl);
  padding: 2.25rem 2rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.25);
}

.primary-result-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.result-main-group {
  display: flex;
  flex-direction: column;
}

.result-tagline {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #BAE6FD;
  margin-bottom: 0.5rem;
}

.reading-time-display {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: #ffffff;
  font-variant-numeric: tabular-nums;
}

.reading-time-subtitle {
  font-size: 0.9375rem;
  color: #E0F2FE;
  margin-top: 0.5rem;
}

.reading-time-empty-hint {
  font-size: 1.25rem;
  font-weight: 600;
  color: #E0F2FE;
}

.result-formula-badge {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  font-size: 0.8125rem;
  max-width: 260px;
}

.result-formula-badge strong {
  display: block;
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
  color: #ffffff;
}

/* Speed Comparison 3-Grid */
.speed-comparison-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.speed-compare-card {
  background: var(--card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast);
}

.speed-compare-card:hover {
  transform: translateY(-2px);
}

.speed-compare-card.current {
  border-color: var(--primary);
  background: #ffffff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.compare-card-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-subtle);
  margin-bottom: 0.5rem;
}

.current-indicator {
  display: none;
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-pill);
}

.speed-compare-card.current .current-indicator {
  display: inline-block;
}

.compare-card-time {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.25rem;
}

.compare-card-wpm {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Statistics Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1rem;
}

.stat-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
}

.stat-box-value {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.stat-box-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-subtle);
  line-height: 1.3;
}

/* Calculator Footer / Actions */
.calc-actions-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.action-buttons-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: #ffffff;
  border: 1.5px solid var(--border-color);
  color: var(--text-main);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-action:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.btn-action svg {
  flex-shrink: 0;
}

/* Accessible Notification Toast */
.action-feedback-toast {
  display: none;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--success);
  background: var(--success-light);
  border: 1px solid rgba(5, 150, 105, 0.2);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
}

.action-feedback-toast.show {
  display: inline-flex;
}

/* --------------------------------------------------------------------------
   6. Ad Placement Placeholders (Google AdSense Readiness)
   -------------------------------------------------------------------------- */
.ad-slot-container {
  margin: 3rem 0;
  padding: 1.25rem;
  background: #FAFAFA;
  border: 1px dashed #D1D5DB;
  border-radius: var(--radius-md);
  text-align: center;
}

.ad-slot-label {
  display: block;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: #9CA3AF;
  margin-bottom: 0.5rem;
}

.ad-slot-placeholder-box {
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #6B7280;
  font-size: 0.8125rem;
  background: #F3F4F6;
  border-radius: var(--radius-sm);
  padding: 1rem;
}

/* --------------------------------------------------------------------------
   7. Editorial & Educational Content Sections
   -------------------------------------------------------------------------- */
.content-section {
  padding: 4.5rem 0;
  position: relative;
}

.content-section.alt-bg {
  background-color: #FFFFFF;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  margin-bottom: 2.75rem;
}

.section-header.text-center {
  text-align: center;
}

.section-kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 44rem;
  line-height: 1.6;
}

.section-header.text-center .section-desc {
  margin-left: auto;
  margin-right: auto;
}

/* Bento Grid Features */
.bento-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.bento-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.bento-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(37, 99, 235, 0.25);
}

.bento-icon-box {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.bento-icon-box.teal {
  background: var(--secondary-light);
  color: var(--secondary-hover);
}

.bento-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.625rem;
}

.bento-text {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Prose Narrative Styles */
.prose-block {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-main);
  max-width: 52rem;
}

.prose-block p {
  margin-bottom: 1.25rem;
  color: #374151;
}

.prose-block h3 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.prose-block ul, .prose-block ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.prose-block li {
  margin-bottom: 0.5rem;
  color: #374151;
}

/* Formula Showcase Box */
.formula-showcase-box {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}

.formula-display-banner {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary-light) 100%);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  text-align: center;
  margin-bottom: 1.75rem;
}

.formula-math-text {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 800;
  color: var(--primary-hover);
  letter-spacing: -0.01em;
}

.formula-math-text span {
  color: var(--text-main);
}

.formula-variables-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.formula-var-card {
  background: var(--card-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  border: 1px solid var(--border-color);
}

.formula-var-symbol {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.formula-var-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.formula-var-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Educational Tables */
.responsive-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: #FFFFFF;
  margin: 2rem 0;
}

.edu-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
}

.edu-table th {
  background: var(--card-subtle);
  padding: 1rem 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.edu-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
}

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

.edu-table td strong {
  color: var(--text-main);
}

.edu-table td.tabular-cell {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--text-main);
}

/* Numbered Steps Grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.step-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
}

.step-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 1rem;
  opacity: 0.85;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.625rem;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Practical Examples Grid */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.example-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.example-type {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.example-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.example-stats-row {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--border-color);
}

.example-stat-item {
  display: flex;
  flex-direction: column;
}

.example-stat-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
}

.example-stat-lbl {
  font-size: 0.6875rem;
  color: var(--text-subtle);
}

.example-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Accuracy & Privacy Cards */
.split-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.info-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
}

.info-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.info-card-icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.info-card-icon.blue {
  background: var(--primary-light);
  color: var(--primary);
}

.info-card-icon.green {
  background: var(--success-light);
  color: var(--success);
}

.info-card-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-main);
}

.info-card-body {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.info-card-body p {
  margin-bottom: 1rem;
}

.info-card-body ul {
  padding-left: 1.25rem;
}

.info-card-body li {
  margin-bottom: 0.5rem;
}

/* --------------------------------------------------------------------------
   8. FAQ Accordion Section
   -------------------------------------------------------------------------- */
.faq-accordion-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 52rem;
  margin: 0 auto;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.faq-summary {
  padding: 1.25rem 1.5rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--text-subtle);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-content {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.65;
  border-top: 1px solid var(--border-subtle);
  margin-top: 0.25rem;
  padding-top: 1rem;
}

/* --------------------------------------------------------------------------
   9. About Mehvi Section
   -------------------------------------------------------------------------- */
.about-box {
  background: linear-gradient(135deg, #FFFFFF 0%, var(--card-subtle) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: var(--shadow-sm);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-copy h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.about-copy p {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.about-features-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.about-feat-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9375rem;
  color: var(--text-main);
}

.about-feat-item svg {
  color: var(--primary);
  margin-top: 0.2rem;
  flex-shrink: 0;
}

.about-metrics-panel {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  box-shadow: var(--shadow-md);
}

.about-metric-block {
  display: flex;
  flex-direction: column;
}

.about-metric-val {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  margin-bottom: 0.25rem;
}

.about-metric-lbl {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   10. Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: #111827;
  color: #9CA3AF;
  padding: 4rem 0 2.5rem;
  margin-top: auto;
  border-top: 1px solid #1F2937;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand-title {
  font-size: 1.375rem;
  font-weight: 800;
  color: #FFFFFF;
}

.footer-brand-title span {
  color: var(--secondary);
}

.footer-brand-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  color: #9CA3AF;
  max-width: 20rem;
}

.footer-nav-col h3 {
  font-size: 0.875rem;
  font-weight: 700;
  color: #FFFFFF;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1.25rem;
}

.footer-nav-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-nav-col a {
  font-size: 0.875rem;
  color: #9CA3AF;
  transition: color var(--transition-fast);
}

.footer-nav-col a:hover {
  color: #FFFFFF;
}

.footer-bottom-bar {
  padding-top: 2rem;
  border-top: 1px solid #1F2937;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8125rem;
}

.footer-legal-copy {
  color: #6B7280;
}

.footer-deployment-badge {
  color: #6B7280;
}

.footer-deployment-badge span {
  color: var(--secondary);
}

/* --------------------------------------------------------------------------
   11. Standalone Policy & 404 Pages
   -------------------------------------------------------------------------- */
.standalone-page {
  padding: 4rem 0 6rem;
}

.standalone-content-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: var(--shadow-sm);
  max-width: 52rem;
  margin: 0 auto;
}

.standalone-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.standalone-date {
  font-size: 0.875rem;
  color: var(--text-subtle);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

/* 404 Page Specific */
.error-404-container {
  text-align: center;
  padding: 5rem 1rem;
  max-width: 36rem;
  margin: 0 auto;
}

.error-404-code {
  font-size: clamp(5rem, 12vw, 8rem);
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

.error-404-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.error-404-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 2rem;
}

.error-404-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Contact Form Specific */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-input, .form-textarea {
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  color: var(--text-main);
  background: #FFFFFF;
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

/* --------------------------------------------------------------------------
   12. Responsive Breakpoints & Mobile Optimization
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .hero-visual-stage {
    min-height: 320px;
  }
  
  .bento-features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
  }

  .hamburger-btn {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 4.25rem;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    gap: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.is-active {
    display: flex;
  }

  .nav-cta-btn {
    width: 100%;
    text-align: center;
  }

  .calc-container {
    padding: 1.25rem;
  }

  .speed-comparison-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .formula-variables-grid {
    grid-template-columns: 1fr;
  }

  .split-info-grid {
    grid-template-columns: 1fr;
  }

  .bento-features-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .card-top-right {
    right: 0;
    top: -0.5rem;
  }

  .card-bottom-left {
    left: 0;
    bottom: -0.5rem;
  }

  .about-box {
    padding: 1.75rem;
  }

  .about-metrics-panel {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .standalone-content-card {
    padding: 1.75rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .calc-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .calc-quick-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .action-buttons-group {
    width: 100%;
    flex-direction: column;
  }

  .btn-action {
    width: 100%;
    justify-content: center;
  }

  .primary-result-card {
    padding: 1.5rem 1.25rem;
  }

  .reading-time-display {
    font-size: 2.25rem;
  }
}

/* --------------------------------------------------------------------------
   13. Reduced Motion Support & Print Styles
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .visual-3d-scene {
    animation: none;
    transform: none;
  }

  .floating-3d-card {
    transform: none;
  }
}

@media print {
  .site-header,
  .hero-section,
  .calc-header,
  .speed-control-bar,
  .calc-quick-actions,
  .calc-actions-footer,
  .ad-slot-container,
  .site-footer {
    display: none !important;
  }

  body {
    background: #ffffff;
    color: #000000;
  }

  .calc-container {
    box-shadow: none;
    border: none;
    padding: 0;
  }

  .primary-result-card {
    background: #2563EB !important;
    color: #ffffff !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .speed-compare-card, .stat-box {
    border: 1px solid #999;
  }
}