/* ============================================
   Roman Numerals Conversion - Styles
   Neo-Classical Editorial Aesthetic
   ============================================ */

/* ============================================
   CSS Variables (Design Tokens)
   ============================================ */
:root {
  /* Colors - Neo-Classical Palette */
  --color-primary: #8B1C1C;         /* Deep burgundy/maroon */
  --color-primary-dark: #5C0F0F;
  --color-primary-light: #A63939;
  --color-secondary: #2C3E50;        /* Dark slate */
  --color-accent: #8B5E3C;           /* Antique gold — darkened for WCAG 1.4.3 contrast compliance (5.58:1 on white, 5.27:1 on cream) */
  
  --color-text: #2C2416;             /* Dark charcoal */
  --color-text-light: #5A4E3F;
  --color-background: #FBF8F3;       /* Cream/ivory */
  --color-background-alt: #F4EFE8;   /* Slightly darker cream */
  --color-border: #A08070;           /* Warm brown — meets WCAG 1.4.11 non-text contrast (3.41:1 on cream) */
  
  --color-success: #4A7C59;
  --color-error: #B84040;
  --color-warning: #C9945A;
  
  /* Typography */
  --font-display: 'Crimson Pro', 'Georgia', serif;
  --font-body: 'Work Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'Courier New', monospace;
  
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.75rem;
  --font-size-5xl: 3.5rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* Layout */
  --container-width: 1200px;
  --container-padding: var(--space-4);
  --section-padding: var(--space-16);
  
  /* Other */
  --border-radius: 0.25rem;
  --shadow-sm: 0 1px 3px rgba(44, 36, 22, 0.08);
  --shadow-md: 0 4px 12px rgba(44, 36, 22, 0.12);
  --shadow-lg: 0 10px 30px rgba(44, 36, 22, 0.15);
  
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Safe media defaults — prevent overflow on all screen sizes */
img,
picture,
video,
canvas,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Buttons and inputs inherit font so they match body text */
button,
input,
select,
textarea {
  font: inherit;
}

html {
  scroll-behavior: smooth;
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  /* Prevent fixed header from obscuring keyboard focus targets (WCAG 2.4.11) */
  scroll-padding-top: 90px;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
  min-width: 0;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  z-index: 10000;
}

/* Global keyboard focus style — visible for keyboard, suppressed for pointer (WCAG 2.4.7) */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Remove default focus ring when :focus-visible is supported (mouse users) */
:focus:not(:focus-visible) {
  outline: none;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--font-size-5xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-6);
}

h3 {
  font-size: var(--font-size-3xl);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--font-size-2xl);
  margin-top: var(--space-6);
}

p {
  margin-bottom: var(--space-4);
}

/* Definition list styling for symbol definitions — aids RAG/AI citation */
dl.symbol-definitions {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--space-2) var(--space-6);
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-6);
  background: var(--color-background-alt);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

dl.symbol-definitions dt {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  padding-top: var(--space-1);
}

dl.symbol-definitions dd {
  color: var(--color-text-light);
  font-size: var(--font-size-base);
  line-height: 1.6;
  margin: 0;
}

@media (max-width: 480px) {
  dl.symbol-definitions {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }
  dl.symbol-definitions dt {
    margin-top: var(--space-3);
  }
}

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

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

strong {
  font-weight: 600;
  color: var(--color-text);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-background-alt);
  padding: 0.2em 0.4em;
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
}

/* ============================================
   Fixed Header/Navigation
   ============================================ */
.fixed-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(251, 248, 243, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.fixed-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-4) var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.logo a {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-6);
}

.main-nav .nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-light);
  text-decoration: none;
  padding: var(--space-2) 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  position: relative;
  transition: color var(--transition-fast);
}

.main-nav .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.main-nav .nav-link:hover,
.main-nav .nav-link.active {
  color: var(--color-primary);
  text-decoration: none;
}

.main-nav .nav-link.active::after,
.main-nav .nav-link:hover::after {
  transform: scaleX(1);
}

.progress-indicator {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-weight: 500;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
}

/* ============================================
   Main Layout
   ============================================ */
main {
  margin-top: 80px;
}

.section {
  padding: var(--section-padding) 0;
  border-bottom: 1px solid var(--color-border);
}

/* Note: content-visibility: auto removed — it causes inflated Speed Index scores
   in Lighthouse because visual completeness is measured as sections render late. */

/* ============================================
   Direct-Answer Box — AI / Featured Snippet
   ============================================ */
.answer-box {
  background: var(--color-background-alt);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--border-radius);
  padding: var(--space-4) var(--space-6);
  margin-bottom: var(--space-6);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
}

.section:last-of-type {
  border-bottom: none;
}

.section-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section-intro {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 800px;
  margin-bottom: var(--space-8);
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-background-alt) 100%);
  border-bottom: 2px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(139, 28, 28, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-ornament {
  font-size: var(--font-size-2xl);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  opacity: 0.6;
}

.hero-section h1 {
  max-width: 900px;
  margin-bottom: var(--space-6);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-light);
  max-width: 800px;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero-benefits {
  list-style: none;
  margin-bottom: var(--space-8);
  max-width: 700px;
}

.hero-benefits li {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.hero-benefits .check {
  color: var(--color-success);
  font-weight: bold;
}

.hero-ctas {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.trust-badge {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.trust-badge .badge-icon {
  color: var(--color-success);
  font-weight: bold;
}

.hero-visual {
  margin-top: var(--space-12);
  text-align: center;
}

.roman-showcase {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-8);
  display: inline-block;
  box-shadow: var(--shadow-lg);
}

.showcase-item {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.showcase-roman {
  font-family: var(--font-display);
  font-size: var(--font-size-5xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
}

.showcase-arabic {
  font-size: var(--font-size-3xl);
  color: var(--color-text-light);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: var(--space-3) var(--space-8);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: white;
  text-decoration: none;
}

/* ============================================
   Converter Tool
   ============================================ */
.converter-tool {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-8);
  margin: var(--space-8) 0;
  box-shadow: var(--shadow-sm);
}

.converter-inputs {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-6);
  align-items: start;
  margin-bottom: var(--space-6);
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.input-group label {
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--font-size-base);
}

.input-group input {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-lg);
  font-family: var(--font-display);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-background);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}

.input-group input:focus,
.input-group input:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-color: var(--color-primary);
}

.input-help {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.swap-button {
  background: var(--color-background-alt);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  margin-top: 28px;
  font-size: var(--font-size-xl);
}

.swap-button:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: rotate(180deg);
}

.converter-actions {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.converter-result {
  padding: var(--space-6);
  min-height: 80px;
  background: var(--color-background-alt);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  font-family: var(--font-display);
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-6);
}

.converter-result:empty::before {
  content: 'Enter a number or Roman numeral above';
  color: var(--color-text-light);
  font-size: var(--font-size-base);
  font-family: var(--font-body);
  font-weight: 400;
}

.converter-features {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.converter-features h3 {
  font-size: var(--font-size-xl);
  margin-top: 0;
  margin-bottom: var(--space-4);
}

.converter-features ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-4);
}

.converter-features li {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.conversion-history {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.conversion-history h3 {
  font-size: var(--font-size-xl);
  margin-top: 0;
  margin-bottom: var(--space-4);
}

.history-list {
  list-style: none;
}

.history-list li {
  padding: var(--space-3);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-2);
  font-family: var(--font-display);
}

.converter-cta {
  text-align: center;
  margin-top: var(--space-8);
  font-size: var(--font-size-lg);
}

/* ============================================
   Tables
   ============================================ */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
}

thead {
  background: var(--color-background-alt);
}

th {
  padding: var(--space-4);
  text-align: left;
  font-weight: 600;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-light);
}

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

tbody tr:hover {
  background: var(--color-background);
}

.symbol-large {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
}

.roman-cell {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
}

.table-wrapper {
  overflow-x: auto;
}

.table-controls {
  margin-bottom: var(--space-4);
}

.table-controls input {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-base);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  width: 100%;
  max-width: 400px;
}

/* ============================================
   Symbol Cards (Visual Symbols)
   ============================================ */
.visual-symbols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-4);
  margin: var(--space-8) 0;
}

.symbol-card {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-6);
  text-align: center;
  transition: all var(--transition-base);
}

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

.symbol-card .symbol {
  display: block;
  font-family: var(--font-display);
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.symbol-card .value {
  display: block;
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
}

/* ============================================
   Principles & Examples
   ============================================ */
.principle-block {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-6);
  margin: var(--space-6) 0;
}

.principle-block h4 {
  margin-top: 0;
  color: var(--color-primary);
}

.examples {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin: var(--space-4) 0;
}

.example {
  padding: var(--space-3);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
}

.example .roman {
  color: var(--color-primary);
  font-weight: 700;
}

.example .breakdown {
  color: var(--color-text-light);
}

.example .result {
  color: var(--color-text);
  font-weight: 700;
}

.note {
  margin-top: var(--space-4);
  padding: var(--space-3);
  background: var(--color-background-alt);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--border-radius);
}

/* ============================================
   Rules & Steps
   ============================================ */
.rules-list {
  list-style: none;
  counter-reset: rules-counter;
}

.rules-list > li {
  counter-increment: rules-counter;
  margin-bottom: var(--space-4);
  padding-left: var(--space-8);
  position: relative;
}

.rules-list > li::before {
  content: counter(rules-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  height: 30px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-sm);
}

.step-by-step {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-6);
  margin: var(--space-8) 0;
}

.step {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-6);
}

.step-number {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--border-radius);
  font-weight: 700;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-3);
}

.step h4 {
  margin-top: var(--space-2);
  font-size: var(--font-size-lg);
}

.worked-example {
  background: var(--color-background-alt);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-8);
  margin: var(--space-8) 0;
}

.example-breakdown {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.breakdown-step {
  padding: var(--space-4);
  background: white;
  border-radius: var(--border-radius);
}

.breakdown-step.result {
  background: var(--color-primary);
  color: white;
}

.final-result {
  font-size: var(--font-size-3xl);
  font-family: var(--font-display);
  font-weight: 700;
  margin: 0;
}

.roman-result {
  color: var(--color-accent);
}

.breakdown-step.result .final-result {
  color: white;
}

.common-mistakes ul {
  list-style: none;
}

.common-mistakes li {
  padding: var(--space-3);
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-2);
}

.wrong {
  color: var(--color-error);
  font-weight: bold;
  margin-right: var(--space-2);
}

.special-cases {
  display: grid;
  gap: var(--space-6);
  margin: var(--space-6) 0;
}

.case {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-6);
}

.case-examples {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background: var(--color-background);
  border-radius: var(--border-radius);
  font-family: var(--font-display);
}

/* ============================================
   Quiz
   ============================================ */
.practice-quiz {
  margin: var(--space-8) 0;
}

.quiz-question {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
}

.quiz-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-lg);
  font-family: var(--font-display);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  margin: var(--space-4) 0;
}

.check-answer-btn {
  padding: var(--space-2) var(--space-6);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.check-answer-btn:hover {
  background: var(--color-primary-dark);
}

.quiz-feedback {
  margin-top: var(--space-4);
  padding: var(--space-3);
  border-radius: var(--border-radius);
  font-weight: 600;
}

.quiz-feedback.correct {
  background: rgba(74, 124, 89, 0.1);
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.quiz-feedback.incorrect {
  background: rgba(184, 64, 64, 0.1);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

/* ============================================
   Reference Section
   ============================================ */
.years-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.year-card {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-6);
  text-align: center;
  transition: all var(--transition-base);
}

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

.year-arabic {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.year-roman {
  display: block;
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

/* ============================================
   Timeline (History Section)
   ============================================ */
.timeline {
  position: relative;
  padding-left: var(--space-12);
  margin: var(--space-8) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-8);
}

.timeline-marker {
  position: absolute;
  left: -52px;
  top: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-background);
  box-shadow: 0 0 0 3px var(--color-border);
}

.timeline-content {
  background: white;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-6);
}

.timeline-content h3 {
  margin-top: 0;
  color: var(--color-primary);
}

/* ============================================
   Code Blocks
   ============================================ */
.code-section {
  margin: var(--space-8) 0;
}

.code-block {
  background: #2C2416;
  border-radius: var(--border-radius);
  overflow: hidden;
  margin: var(--space-4) 0;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.code-lang {
  color: var(--color-accent);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.copy-code-btn {
  padding: var(--space-2) var(--space-3);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-code-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.code-block pre {
  margin: 0;
  padding: var(--space-6);
  overflow-x: auto;
}

.code-block code {
  background: none;
  border: none;
  color: #E8DCC8;
  font-size: var(--font-size-sm);
  line-height: 1.6;
  padding: 0;
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-content {
  max-width: 900px;
}

.faq-item {
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-4);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  background: white;
  border: none;
  padding: var(--space-6);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-background);
}

.faq-q-text {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
}

.faq-icon {
  font-size: var(--font-size-3xl);
  color: var(--color-primary);
  transition: color var(--transition-base);
  flex-shrink: 0;
  font-weight: 300;
  line-height: 1;
}

.faq-question[aria-expanded="true"] .faq-icon {
  color: var(--color-accent);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-answer p {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================================
   CTAs & Section Links
   ============================================ */
.section-cta {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.section-cta p {
  margin-bottom: var(--space-3);
}

.cta-link {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 2px solid var(--color-primary);
  transition: all var(--transition-fast);
}

.cta-link:hover {
  color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  text-decoration: none;
}

/* ============================================
   Footer
   ============================================ */
#site-footer {
  background: var(--color-secondary);
  color: #E8DCC8;
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-20);
}

.footer-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-section h3, .footer-section h4 {
  color: #FFFFFF;
  margin-bottom: var(--space-4);
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.footer-section h3 {
  font-size: var(--font-size-lg);
  line-height: 1.3;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--space-1);
}

/* WCAG 2.5.8 — minimum 24×24px touch target for footer links */
.footer-section a {
  color: #E8DCC8;
  text-decoration: none;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 3px 0;
}

.footer-section a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-6) var(--container-padding) 0;
  border-top: 1px solid rgba(232, 220, 200, 0.2);
  text-align: center;
  color: rgba(232, 220, 200, 0.7);
  font-size: var(--font-size-sm);
}

.footer-bottom p {
  margin-bottom: var(--space-2);
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-4px);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  :root {
    --font-size-5xl: 3rem;
    --font-size-4xl: 2.25rem;
    --section-padding: var(--space-12);
  }
  
  .hero-section h1 {
    font-size: var(--font-size-4xl);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --section-padding: var(--space-8);
  }
  
  .main-nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--color-background);
    border-bottom: 2px solid var(--color-border);
    padding: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-base);
    pointer-events: none;
  }
  
  .main-nav.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .progress-indicator {
    display: none;
  }
  
  .converter-inputs {
    grid-template-columns: 1fr;
  }
  
  .swap-button {
    margin-top: 0;
    transform: rotate(90deg);
  }
  
  .hero-ctas {
    flex-direction: column;
  }
  
  .step-by-step {
    grid-template-columns: 1fr;
  }
  
  .visual-symbols {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }
  
  .years-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
  
  .timeline {
    padding-left: var(--space-8);
  }
  
  .timeline-marker {
    left: -40px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
  }
  
  .showcase-item {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .showcase-roman {
    font-size: var(--font-size-4xl);
  }
  
  table {
    font-size: var(--font-size-sm);
  }
  
  th, td {
    padding: var(--space-2);
  }
}

/* ============================================
   320px — Narrowest legacy phones
   ============================================ */
@media (max-width: 320px) {
  :root {
    --font-size-5xl: 1.75rem;
    --font-size-4xl: 1.5rem;
    --font-size-3xl: 1.25rem;
    --container-padding: var(--space-3);
  }

  .btn {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
  }

  .converter-tool {
    padding: var(--space-4);
  }
}

/* ============================================
   Reduced Motion — respect user OS preference
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}