/* ========================================
   Snow Day Academy - Marketing Site
   ======================================== */

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

:root {
  --color-snow: #f8fafc;
  --color-ice: #e8f0fe;
  --color-frost: #c5d5ea;
  --color-slate: #334155;
  --color-dark: #0f172a;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-accent: #0ea5e9;
  --color-warm: #f59e0b;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-white: #ffffff;
  --font-serif: 'Libre Baskerville', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --container-max: 1120px;
  --radius: 8px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.05);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  line-height: 1.25;
  color: var(--color-dark);
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 600;
  text-align: center;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
}

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

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

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

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

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

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

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

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

/* --- Header / Nav --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-ice);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-dark);
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--color-accent);
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

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

.nav-links .btn:hover {
  background: var(--color-primary-dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: all 0.3s;
}

.nav-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero --- */
.hero {
  padding: 100px 0 80px;
  background: linear-gradient(135deg, var(--color-snow) 0%, var(--color-ice) 100%);
}

.hero-content {
  max-width: 680px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- Section Helpers --- */
.section-title {
  font-size: 2.2rem;
  text-align: center;
  margin-bottom: 16px;
}

.section-subtitle {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 56px;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  line-height: 1.7;
}

/* --- Features --- */
.features {
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.feature-card {
  padding: 36px;
  border-radius: var(--radius-lg);
  background: var(--color-snow);
  border: 1px solid var(--color-ice);
  transition: box-shadow 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

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

/* --- Web App Section --- */
.web-app-section {
  padding: 100px 0;
  background: var(--color-snow);
}

.app-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.app-text h2 {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.app-text .lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
  line-height: 1.7;
}

.app-features-list {
  list-style: none;
  margin-bottom: 32px;
}

.app-features-list li {
  padding: 12px 0;
  padding-left: 28px;
  position: relative;
  line-height: 1.6;
  color: var(--color-slate);
}

.app-features-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* App Mockup */
.app-mockup {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  border: 1px solid var(--color-ice);
}

.mockup-bar {
  display: flex;
  gap: 6px;
  padding: 14px 18px;
  background: var(--color-snow);
  border-bottom: 1px solid var(--color-ice);
}

.mockup-bar .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-frost);
}

.mockup-content {
  padding: 32px;
}

.mockup-passage {
  margin-bottom: 28px;
}

.mockup-book-title {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.mockup-text {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  font-style: italic;
  padding: 16px;
  background: var(--color-snow);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-accent);
}

.mockup-controls {
  margin-top: 16px;
  display: flex;
  gap: 12px;
}

.mockup-btn-mic {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
}

.mockup-score {
  display: flex;
  justify-content: center;
}

.score-circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.score-number {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}

.score-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
}

/* --- Ebooks Section --- */
.ebooks-section {
  padding: 100px 0;
}

.ebook-card {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 56px;
  align-items: center;
  padding: 48px;
  border-radius: var(--radius-lg);
  background: var(--color-snow);
  border: 1px solid var(--color-ice);
}

.ebook-card.featured {
  box-shadow: var(--shadow-lg);
}

/* Book Cover CSS */
.ebook-cover {
  position: relative;
  perspective: 800px;
}

.book-spine {
  display: none;
}

.book-front {
  background: linear-gradient(160deg, #1a365d 0%, #1e3a5f 40%, #2d4a7a 100%);
  color: var(--color-white);
  padding: 40px 28px;
  border-radius: 4px 12px 12px 4px;
  min-height: 420px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  box-shadow:
    inset -2px 0 8px rgba(0,0,0,0.15),
    6px 6px 20px rgba(0,0,0,0.2);
  overflow: hidden;
}

.book-front::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(255,255,255,0.01) 2px,
    rgba(255,255,255,0.01) 4px
  );
  pointer-events: none;
}

.book-front::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 16px;
  background: linear-gradient(90deg, rgba(0,0,0,0.2) 0%, transparent 100%);
  pointer-events: none;
}

.ebook-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--color-warm);
  color: var(--color-dark);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border-radius: 4px;
  font-family: var(--font-sans);
}

.ebook-series {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  opacity: 0.7;
  margin-bottom: 20px;
}

.ebook-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.35;
  margin-bottom: 24px;
  color: var(--color-white);
}

.ebook-author {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  opacity: 0.8;
}

.ebook-details h3 {
  font-size: 1.6rem;
  margin-bottom: 16px;
}

.ebook-details p {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  font-size: 1.05rem;
}

.ebook-highlights {
  list-style: none;
  margin-bottom: 32px;
}

.ebook-highlights li {
  padding: 8px 0 8px 28px;
  position: relative;
  color: var(--color-slate);
  line-height: 1.5;
}

.ebook-highlights li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* --- CTA Section --- */
.cta-section {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e40af 100%);
  color: var(--color-white);
}

.cta-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  color: var(--color-white);
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.cta-content p {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- 404 Page --- */
.error-page {
  padding: 120px 0;
  background: linear-gradient(135deg, var(--color-snow) 0%, var(--color-ice) 100%);
  min-height: 60vh;
  display: flex;
  align-items: center;
}

.error-content {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.error-icon {
  font-size: 3rem;
  color: var(--color-accent);
  display: block;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 5rem;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.error-content p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Footer --- */
.site-footer {
  padding: 64px 0 32px;
  background: var(--color-dark);
  color: var(--color-frost);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo-icon {
  color: var(--color-accent);
}

.footer-brand .logo-text {
  color: var(--color-white);
}

.footer-brand p {
  margin-top: 12px;
  color: var(--color-frost);
  font-size: 0.95rem;
}

.footer-links h4 {
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--color-frost);
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

.footer-bottom {
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .hero h1 {
    font-size: 2.2rem;
  }

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

  .app-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .app-visual {
    order: -1;
  }

  .ebook-card {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px;
  }

  .ebook-cover {
    max-width: 280px;
    margin: 0 auto;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-white);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-ice);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 60px 0;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .features,
  .web-app-section,
  .ebooks-section,
  .cta-section {
    padding: 64px 0;
  }

  .ebook-details h3 {
    font-size: 1.3rem;
  }

  .cta-content h2 {
    font-size: 1.7rem;
  }
}