/* Hallmark · pre-emit critique: P5 H4 E5 S4 R5 V4 */

:root {
  --color-bg: #0A0F1A;
  --color-surface: #141B2D;
  --color-surface-hover: #1E2640;
  --color-accent: #8B5CF6;
  --color-accent-light: #A78BFA;
  --color-accent-glow: rgba(139, 92, 246, 0.15);
  --color-text: #F5F5F5;
  --color-text-muted: #9CA3AF;
  --color-border: rgba(255, 255, 255, 0.08);
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  background: rgba(10, 15, 26, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.125rem;
}

.nav-logo-img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-cta {
  background: var(--color-accent);
  color: var(--color-text) !important;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  transition: background 0.2s, transform 0.2s !important;
}

.nav-cta:hover {
  background: var(--color-accent-light);
  transform: translateY(-1px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--color-accent-glow);
}

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

.btn-secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-text-muted);
}

.btn-large {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

/* Hero Section */
.hero {
  min-height: 80vh;
  padding: 10rem 1.5rem 6rem;
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.hero-content {
  max-width: 650px;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: var(--color-accent-glow);
  color: var(--color-accent-light);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 2rem;
  border: 1px solid rgba(139, 92, 246, 0.2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 1.75rem;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

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

.phone-mockup {
  position: relative;
  width: 260px;
  height: 540px;
  background: var(--color-surface);
  border-radius: 40px;
  padding: 10px;
  box-shadow: 
    0 50px 100px -20px rgba(0, 0, 0, 0.5),
    0 0 0 1px var(--color-border),
    inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.phone-mockup::before {
  content: '';
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: 70px;
  height: 22px;
  background: var(--color-bg);
  border-radius: 20px;
  z-index: 10;
}

.phone-mockup img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 30px;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
}

.hero-stats {
  display: flex;
  gap: 4rem;
  justify-content: center;
  padding: 2rem 3rem;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent-light);
}

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

/* Section Header */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto;
}

/* Features Section */
.features {
  padding: 6rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139, 92, 246, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-glow);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-accent-light);
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Subjects Section */
.subjects {
  padding: 6rem 1.5rem;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.subjects-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  max-width: 900px;
  margin: 0 auto;
}

.subject-tag {
  padding: 0.625rem 1.25rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: all 0.2s;
}

.subject-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-light);
}

/* Download Section */
.download {
  padding: 8rem 1.5rem;
  text-align: center;
}

.download-content {
  max-width: 600px;
  margin: 0 auto;
}

.download h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.download > .download-content > p:first-of-type {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.download-note {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Footer */
.footer {
  padding: 4rem 1.5rem 2rem;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 3rem;
}

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

.footer-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 7rem 1.25rem 4rem;
    min-height: auto;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero h1 {
    font-size: 2.25rem;
    line-height: 1.15;
  }

  .hero h1 br {
    display: none;
  }

  .hero-subtitle {
    font-size: 1rem;
    padding: 0 0.5rem;
  }

  .features {
    padding: 4rem 1.25rem;
  }

  .section-header h2 {
    font-size: 1.75rem;
  }

  .subjects {
    padding: 4rem 1.25rem;
  }

  .download {
    padding: 5rem 1.25rem;
  }

  .download h2 {
    font-size: 1.75rem;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 1rem;
  }

  .nav-links a:not(.nav-cta) {
    display: none;
  }

  .nav-cta {
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
  }

  .hero {
    padding: 6rem 1rem 3rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
    line-height: 1.6;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    max-width: 100%;
    justify-content: center;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }

  .features {
    padding: 3rem 1rem;
  }

  .features-grid {
    gap: 1rem;
  }

  .section-header {
    margin-bottom: 2rem;
  }

  .section-header h2 {
    font-size: 1.5rem;
  }

  .section-header p {
    font-size: 0.95rem;
  }

  .feature-card {
    padding: 1.25rem;
  }

  .feature-card h3 {
    font-size: 1rem;
  }

  .feature-card p {
    font-size: 0.875rem;
  }

  .subjects {
    padding: 3rem 1rem;
  }

  .subjects-list {
    gap: 0.5rem;
  }

  .subject-tag {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
  }

  .download {
    padding: 4rem 1rem;
  }

  .download h2 {
    font-size: 1.5rem;
  }

  .download-content > p {
    font-size: 0.95rem;
  }

  .footer {
    padding: 3rem 1rem 1.5rem;
  }

  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }

  .footer-brand {
    max-width: 100%;
  }

  .footer-links {
    gap: 1.5rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* Focus states */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}