/* CSCA.ai Premium Design System */
/* Apple + Duolingo Aesthetic */

:root {
  /* Apple-inspired neutrals */
  --color-bg: #ffffff;
  --color-bg-secondary: #f5f5f7;
  --color-bg-tertiary: #fafafa;
  --color-text: #1d1d1f;
  --color-text-secondary: #86868b;
  --color-border: #d2d2d7;
  
  /* Duolingo-inspired accents */
  --color-emerald: #58cc02;
  --color-emerald-dark: #389e0d;
  --color-orange: #ff9600;
  --color-orange-dark: #e6850b;
  --color-blue: #1cb0f6;
  --color-blue-dark: #0d8bc9;
  --color-red: #ff4b4b;
  --color-purple: #ce82ff;
  
  /* Navy (CSCA brand) */
  --color-navy: #1a237e;
  --color-navy-light: #3949ab;
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  
  /* Spacing (Apple-style) */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
  --space-2xl: 120px;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
  
  /* Border radius (24px as requested) */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.47059;
  color: var(--color-text);
  background: var(--color-bg);
  letter-spacing: -0.022em;
}

/* Typography Scale (Apple-style) */
.text-hero {
  font-size: 80px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.015em;
}

.text-headline {
  font-size: 48px;
  font-weight: 600;
  line-height: 1.08349;
  letter-spacing: -0.003em;
}

.text-title-1 {
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0;
}

.text-title-2 {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.125;
  letter-spacing: 0.004em;
}

.text-title-3 {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.16667;
  letter-spacing: 0.009em;
}

.text-body {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47059;
  letter-spacing: -0.022em;
}

.text-caption {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.28577;
  letter-spacing: -0.016em;
}

/* Glassmorphism Navigation */
.glass-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.glass-nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 21px;
  color: var(--color-navy);
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
}

/* Navigation Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

.nav-link:hover {
  background: var(--color-bg-secondary);
}

.nav-link.active {
  color: var(--color-navy);
  font-weight: 600;
}

/* CTA Button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--color-emerald);
  color: white;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 0 var(--color-emerald-dark);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 var(--color-emerald-dark);
}

.btn-primary:active {
  transform: translateY(4px);
  box-shadow: 0 0 0 var(--color-emerald-dark);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  background: white;
  color: var(--color-navy);
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--color-navy);
  background: var(--color-bg-tertiary);
}

.btn-orange {
  background: var(--color-orange);
  box-shadow: 0 4px 0 var(--color-orange-dark);
}

.btn-orange:hover {
  box-shadow: 0 6px 0 var(--color-orange-dark);
}

.btn-orange:active {
  box-shadow: 0 0 0 var(--color-orange-dark);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 120px var(--space-md) var(--space-2xl);
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(88, 204, 2, 0.1);
  color: var(--color-emerald-dark);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-emerald);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  max-width: 900px;
  margin-bottom: var(--space-md);
}

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

.hero-subtitle {
  font-size: 24px;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-lg);
}

/* Live Counter */
.live-counter {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 16px 24px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  margin-bottom: var(--space-lg);
}

.counter-number {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-navy);
  font-variant-numeric: tabular-nums;
}

.counter-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-align: left;
  line-height: 1.3;
}

/* Hero CTA Group */
.hero-cta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

/* Bento Grid */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.bento-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.bento-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.bento-card-large {
  grid-column: span 2;
}

.bento-card-full {
  grid-column: span 3;
}

/* Feature Cards */
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: var(--space-md);
}

.feature-icon.emerald { background: rgba(88, 204, 2, 0.1); }
.feature-icon.orange { background: rgba(255, 150, 0, 0.1); }
.feature-icon.blue { background: rgba(28, 176, 246, 0.1); }
.feature-icon.purple { background: rgba(206, 130, 255, 0.1); }

/* Progress Ring (Duolingo-style) */
.progress-ring {
  position: relative;
  width: 80px;
  height: 80px;
}

.progress-ring svg {
  transform: rotate(-90deg);
}

.progress-ring-bg {
  fill: none;
  stroke: var(--color-bg-secondary);
  stroke-width: 8;
}

.progress-ring-fill {
  fill: none;
  stroke: var(--color-emerald);
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s ease;
}

.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-emerald);
}

/* Blog Cards */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: var(--space-md);
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.blog-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.blog-card-image {
  height: 200px;
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
}

.blog-card-content {
  padding: var(--space-md);
}

.blog-card-category {
  display: inline-block;
  padding: 6px 12px;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
}

.blog-card-title {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.blog-card-excerpt {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Article Layout (Notion-style) */
.article-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 100px var(--space-md) var(--space-2xl);
}

.article-header {
  margin-bottom: var(--space-lg);
}

.article-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-secondary);
  font-size: 14px;
}

/* TL;DR Box */
.tldr-box {
  background: linear-gradient(135deg, #fef9e7 0%, #fcf3cf 100%);
  border-left: 4px solid #f4d03f;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.tldr-box h3 {
  font-size: 14px;
  font-weight: 700;
  color: #b7950b;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.tldr-box p {
  color: #7d6608;
  line-height: 1.6;
}

/* Pro Tip Box */
.protip-box {
  background: linear-gradient(135deg, #e8f8f5 0%, #d1f2eb 100%);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin: var(--space-md) 0;
  display: flex;
  gap: var(--space-sm);
}

.protip-box::before {
  content: '💡';
  font-size: 24px;
  flex-shrink: 0;
}

.protip-box strong {
  color: #0e6251;
  display: block;
  margin-bottom: 4px;
}

.protip-box p {
  color: #117a65;
  font-size: 15px;
  line-height: 1.5;
}

/* Warning Box */
.warning-box {
  background: linear-gradient(135deg, #fdedec 0%, #f5b7b1 100%);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin: var(--space-md) 0;
  display: flex;
  gap: var(--space-sm);
}

.warning-box::before {
  content: '⚠️';
  font-size: 24px;
  flex-shrink: 0;
}

.warning-box strong {
  color: #922b21;
  display: block;
  margin-bottom: 4px;
}

.warning-box p {
  color: #7b241c;
  font-size: 15px;
  line-height: 1.5;
}

/* Graduate Box */
.graduate-box {
  background: linear-gradient(135deg, #ebf5fb 0%, #d4e6f1 100%);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin: var(--space-md) 0;
  display: flex;
  gap: var(--space-sm);
}

.graduate-box::before {
  content: '🎓';
  font-size: 24px;
  flex-shrink: 0;
}

.graduate-box strong {
  color: #1a5276;
  display: block;
  margin-bottom: 4px;
}

.graduate-box p {
  color: #2471a3;
  font-size: 15px;
  line-height: 1.5;
}

/* Table of Contents */
.toc {
  position: sticky;
  top: 100px;
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
}

.toc-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

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

.toc-list li {
  margin-bottom: 8px;
}

.toc-list a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 14px;
  display: block;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.toc-list a:hover {
  background: var(--color-bg-secondary);
  color: var(--color-navy);
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: var(--space-md) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.data-table th {
  background: var(--color-bg-secondary);
  padding: 16px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.data-table td {
  padding: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 15px;
}

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

/* Timeline */
.timeline {
  position: relative;
  padding-left: 32px;
  margin: var(--space-md) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-md);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: white;
  border: 3px solid var(--color-emerald);
  border-radius: 50%;
}

.timeline-item.completed::before {
  background: var(--color-emerald);
}

.timeline-date {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-emerald-dark);
  margin-bottom: 4px;
}

.timeline-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.timeline-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Eligibility Checker */
.eligibility-checker {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  max-width: 600px;
  margin: 0 auto;
}

.checker-step {
  display: none;
}

.checker-step.active {
  display: block;
}

.checker-options {
  display: grid;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.checker-option {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

.checker-option:hover {
  background: white;
  border-color: var(--color-emerald);
}

.checker-option.selected {
  background: rgba(88, 204, 2, 0.1);
  border-color: var(--color-emerald);
}

.checker-option-icon {
  font-size: 32px;
}

.checker-option-text {
  flex: 1;
}

.checker-option-title {
  font-weight: 600;
  color: var(--color-text);
}

.checker-option-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Mock Test Preview Card */
.mock-preview {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  color: white;
  position: relative;
  overflow: hidden;
}

.mock-preview::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(88, 204, 2, 0.1) 0%, transparent 70%);
}

.mock-preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
}

.mock-preview-title {
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mock-preview-timer {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-orange);
}

.mock-preview-question {
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
}

.mock-preview-qtext {
  font-size: 16px;
  margin-bottom: var(--space-md);
  line-height: 1.5;
}

.mock-preview-options {
  display: grid;
  gap: 8px;
}

.mock-preview-option {
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mock-preview-option:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* WhatsApp Share Button */
.whatsapp-share {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: #25d366;
  color: white;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.whatsapp-share:hover {
  background: #128c7e;
  transform: translateY(-2px);
}

/* Footer */
.footer {
  background: var(--color-bg-secondary);
  padding: var(--space-2xl) var(--space-md);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-lg);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 21px;
  color: var(--color-navy);
  margin-bottom: var(--space-sm);
}

.footer-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  max-width: 1200px;
  margin: var(--space-lg) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copyright {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
  .text-hero {
    font-size: 56px;
  }
  
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .bento-card-large,
  .bento-card-full {
    grid-column: span 2;
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .text-hero {
    font-size: 40px;
  }
  
  .nav-links {
    display: none;
  }
  
  .bento-grid {
    grid-template-columns: 1fr;
  }
  
  .bento-card-large,
  .bento-card-full {
    grid-column: span 1;
  }
  
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .blog-card-image {
    height: 140px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .article-container {
    padding-top: 80px;
  }

  .data-table {
    display: block;
    overflow-x: auto;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .text-hero { font-size: 32px; }
  .hero-subtitle { font-size: 16px; }
  .blog-card-title { font-size: 17px; }
  .blog-card-image { height: 120px; font-size: 48px; }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.hidden { display: none !important; }