/* OSCE Exam Guide - Core Stylesheet
   Clean, responsive layout for OSCE exam content */

:root {
  /* Brand Colors */
  --primary-blue: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  --accent-purple: #8b5cf6;
  
  /* Neutrals */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-light: #e2e8f0;
  --border-medium: #cbd5e1;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 30px rgba(37, 99, 235, 0.3);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Spacing */
  --spacing-unit: 0.25rem;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ═══════════════════════════════════════════════════════════════
   RESET & BASE
   ═══════════════════════════════════════════════════════════════ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  line-height: 1.6;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ═══════════════════════════════════════════════════════════════
   STICKY HEADER
   ═══════════════════════════════════════════════════════════════ */

.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

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

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  transition: transform 0.2s ease;
}

.logo:hover {
  transform: scale(1.05);
}

.logo-image {
  height: 40px;
  width: auto;
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-menu a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: color 0.2s ease;
  position: relative;
}

.nav-menu a:hover {
  color: var(--primary-blue);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-blue);
  transition: width 0.3s ease;
}

.nav-menu a:hover::after {
  width: 100%;
}

.cta-buttons {
  display: flex;
  gap: 0.75rem;
}

.btn {
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-outline {
  border: 2px solid var(--primary-blue);
  color: var(--primary-blue);
  background: white;
}

.btn-outline:hover {
  background: var(--primary-blue);
  color: white;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 0.375rem;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s ease;
}

/* ═══════════════════════════════════════════════════════════════
   HERO SECTION
   ═══════════════════════════════════════════════════════════════ */

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hero {
  background: white;
  border-radius: var(--radius-2xl);
  margin: 2rem auto;
  padding: 4rem 3rem;
  box-shadow: var(--shadow-2xl);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.1), transparent 70%);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary-blue);
  margin-bottom: 1.5rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary), var(--primary-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-blue);
  display: block;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* ═══════════════════════════════════════════════════════════════
   TABLE OF CONTENTS
   ═══════════════════════════════════════════════════════════════ */

.toc {
  background: #ffffff;
  border-radius: var(--radius-xl);
  padding: 1.75rem 1.75rem 1.5rem;
  margin: 2rem auto;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

.toc h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.toc-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: background 0.15s ease, border-color 0.15s ease;
  background: white;
}

.toc-item:hover {
  border-color: var(--border-medium);
  background: var(--bg-secondary);
}

.toc-icon {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-medium);
  font-weight: 600;
  font-size: 0.8rem;
}

.toc-label {
  font-weight: 500;
  color: var(--text-secondary);
}

/* ═══════════════════════════════════════════════════════════════
   SECTION LAYOUTS
   ═══════════════════════════════════════════════════════════════ */

.section {
  background: white;
  border-radius: var(--radius-2xl);
  padding: 3rem 2.5rem;
  margin: 2rem auto;
  box-shadow: var(--shadow-lg);
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* ═══════════════════════════════════════════════════════════════
   INTERACTIVE QUIZ
   ═══════════════════════════════════════════════════════════════ */

.quiz-container {
  background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
  border-radius: var(--radius-xl);
  padding: 2rem;
  border: 2px solid var(--primary-blue);
}

.quiz-header {
  text-align: center;
  margin-bottom: 2rem;
}

.quiz-question {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.quiz-options {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.quiz-option {
  padding: 1rem 1.5rem;
  background: white;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  text-align: left;
  transition: all 0.2s ease;
  font-weight: 500;
}

.quiz-option:hover:not(.correct):not(.incorrect) {
  border-color: var(--primary-blue);
  transform: translateX(4px);
}

.quiz-option.correct {
  background: #dcfce7;
  border-color: var(--accent-green);
}

.quiz-option.incorrect {
  background: #fee2e2;
  border-color: #ef4444;
}

.quiz-result {
  padding: 1rem;
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: 600;
  display: none;
}

.quiz-result.show {
  display: block;
}

.quiz-result.success {
  background: #dcfce7;
  color: #166534;
}

.quiz-result.error {
  background: #fee2e2;
  color: #991b1b;
}

/* ═══════════════════════════════════════════════════════════════
   STATION TIMER
   ═══════════════════════════════════════════════════════════════ */

.timer-widget {
  background: linear-gradient(135deg, #fff7ed, #fed7aa);
  border-radius: var(--radius-xl);
  padding: 2rem;
  text-align: center;
  border: 2px solid var(--accent-orange);
}

.timer-display {
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent-orange);
  margin: 1rem 0;
  font-variant-numeric: tabular-nums;
}

.timer-controls {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.timer-presets {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.preset-btn {
  padding: 0.5rem 1rem;
  background: white;
  border: 2px solid var(--accent-orange);
  border-radius: var(--radius-md);
  color: var(--accent-orange);
  font-weight: 600;
  font-size: 0.875rem;
}

.preset-btn:hover {
  background: var(--accent-orange);
  color: white;
}

/* ═══════════════════════════════════════════════════════════════
   FEATURE CARDS
   ═══════════════════════════════════════════════════════════════ */

.feature-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

/* Two-column variant for selected sections (e.g. preparation) */
.feature-grid-2col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-card {
  padding: 2rem;
  background: linear-gradient(135deg, #f8fafc, #ffffff);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-blue);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-purple));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-glow);
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.98rem;
}

/* ═══════════════════════════════════════════════════════════════
   STATION TYPES
   ═══════════════════════════════════════════════════════════════ */

.station-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.station-card {
  padding: 1.5rem;
  background: white;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.station-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-blue), var(--accent-purple));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.station-card:hover::before {
  transform: scaleX(1);
}

.station-card:hover {
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-lg);
}

.station-emoji {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

.station-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.station-description {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════════
   PROGRESS TRACKER
   ═══════════════════════════════════════════════════════════════ */

.progress-widget {
  background: linear-gradient(135deg, #ede9fe, #ddd6fe);
  border-radius: var(--radius-xl);
  padding: 2rem;
  border: 2px solid var(--accent-purple);
}

.progress-header {
  text-align: center;
  margin-bottom: 2rem;
}

.progress-bar-container {
  background: white;
  height: 24px;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 1.5rem 0;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-green), var(--primary-blue));
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 0.75rem;
  font-weight: 700;
  color: white;
  font-size: 0.75rem;
}

.progress-checklist {
  display: grid;
  gap: 0.75rem;
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: white;
  border-radius: var(--radius-md);
}

.checklist-checkbox {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.checklist-checkbox.checked {
  background: var(--accent-green);
  border-color: var(--accent-green);
}

.checklist-checkbox.checked::after {
  content: '✓';
  color: white;
  font-weight: 700;
}

.checklist-label {
  flex: 1;
  font-weight: 500;
  color: var(--text-secondary);
}

/* ═══════════════════════════════════════════════════════════════
   FAQ ACCORDION
   ═══════════════════════════════════════════════════════════════ */

.faq-list {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.faq-item {
  background: white;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-item.active {
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--text-primary);
  background: white;
  transition: background 0.2s ease;
}

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

.faq-toggle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary-blue);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 1rem;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.5rem;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  padding: 0 1.5rem 1.25rem;
  max-height: 500px;
}

/* ═══════════════════════════════════════════════════════════════
   CTA SECTIONS
   ═══════════════════════════════════════════════════════════════ */

.cta-banner {
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-purple));
  border-radius: var(--radius-2xl);
  padding: 3rem 2rem;
  text-align: center;
  color: white;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-2xl);
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent 50%);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.cta-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
}

.cta-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-description {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.cta-buttons-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-white {
  background: white;
  color: var(--primary-blue);
  padding: 1rem 2rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  box-shadow: var(--shadow-lg);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

/* ═══════════════════════════════════════════════════════════════
   TESTIMONIALS
   ═══════════════════════════════════════════════════════════════ */

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.testimonial-card {
  padding: 2rem;
  background: linear-gradient(135deg, #ffffff, #f8fafc);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-xl);
  position: relative;
}

.quote-mark {
  font-size: 3rem;
  color: var(--primary-blue);
  opacity: 0.2;
  position: absolute;
  top: 1rem;
  left: 1.5rem;
}

.testimonial-text {
  position: relative;
  z-index: 1;
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-blue), var(--accent-green));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.125rem;
}

.author-info {
  flex: 1;
}

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

.author-role {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ═══════════════════════════════════════════════════════════════
   TABLE STYLING
   ═══════════════════════════════════════════════════════════════ */

.table-container {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
}

.data-table thead {
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
  color: white;
}

.data-table th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.data-table tbody tr:hover {
  background: var(--bg-secondary);
}

/* ═══════════════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════════════ */

.footer {
  background: white;
  border-radius: var(--radius-2xl);
  padding: 3rem 2.5rem;
  margin: 2rem auto 3rem;
  box-shadow: var(--shadow-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-column h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--primary-blue);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    display: none;
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .hero {
    padding: 2rem 1.5rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-stats {
    gap: 1rem;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .section {
    padding: 2rem 1.5rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .feature-grid,
  .station-grid,
  .testimonial-grid {
    grid-template-columns: 1fr;
  }
  
  .timer-display {
    font-size: 3rem;
  }
  
  .cta-banner {
    padding: 2rem 1.5rem;
  }
  
  .cta-title {
    font-size: 1.5rem;
  }
}

/* ═══════════════════════════════════════════════════════════════
   ANIMATIONS & UTILITIES
   ═══════════════════════════════════════════════════════════════ */

.fade-in {
  animation: fadeIn 0.6s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--primary-blue);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 999;
}

.scroll-to-top.visible {
  opacity: 1;
  pointer-events: all;
}

.scroll-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2xl);
}