/* LoreSync Website Stylesheet - Pure CSS, No External Dependencies */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  
  /* Light mode palette (reading feel: warm paper, high contrast slate) */
  --bg-page: #fafaf9;
  --bg-surface: #ffffff;
  --bg-subtle: #f4f4f5;
  --bg-card: #ffffff;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;
  
  --accent-primary: #2563eb;
  --accent-primary-hover: #1d4ed8;
  --accent-subtle: #eff6ff;
  --accent-border: #bfdbfe;
  
  --coffee-bg: #f59e0b;
  --coffee-hover: #d97706;
  --coffee-text: #ffffff;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  
  --container-width: 1040px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-page: #0b0f19;
    --bg-surface: #111827;
    --bg-subtle: #1f2937;
    --bg-card: #141c2e;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --border-color: #1e293b;
    --border-subtle: #172033;
    
    --accent-primary: #3b82f6;
    --accent-primary-hover: #60a5fa;
    --accent-subtle: rgba(59, 130, 246, 0.12);
    --accent-border: rgba(59, 130, 246, 0.3);
    
    --coffee-bg: #d97706;
    --coffee-hover: #b45309;
    --coffee-text: #ffffff;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
  }
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-primary-hover);
}

img, svg {
  display: block;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.container-narrow {
  max-width: 760px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(250, 250, 249, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  .site-header {
    background-color: rgba(11, 15, 25, 0.85);
  }
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.brand-name {
  letter-spacing: -0.02em;
}

.nav-toggle {
  display: none;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  transition: all 0.15s ease;
}

.lang-switch:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border-color: var(--accent-border);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
  cursor: pointer;
  border: 1px solid transparent;
  line-height: 1.25;
  text-align: center;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff !important;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary) !important;
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

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

.btn-coffee {
  background-color: var(--coffee-bg);
  color: var(--coffee-text) !important;
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(217, 119, 6, 0.3);
}

.btn-coffee:hover {
  background-color: var(--coffee-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.4);
}

/* Hero Section */
.hero {
  padding: 72px 0 56px;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
  background-color: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 660px;
  margin: 0 auto 36px;
}

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

.hero-note {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 16px;
}

/* Sections Common */
.section {
  padding: 64px 0;
}

.section-alt {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: 8px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto;
}

/* Typography balancing */
h1, h2, h3, h4,
.hero-title,
.section-title,
.page-title,
.card-title,
.step-title,
.faq-question,
.faq-title {
  text-wrap: balance;
}

/* Grid layout for features (desktop 2x2) */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

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

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

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

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

/* Steps Section */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  position: relative;
  text-align: left;
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: var(--accent-primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Privacy Box */
.privacy-box {
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-subtle) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px 36px;
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}

.privacy-box .section-header {
  margin-bottom: 24px;
}

.privacy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 28px;
}

.privacy-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.privacy-check {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background-color: #10b981;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  margin-top: 2px;
}

.privacy-item-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.privacy-item-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Coffee CTA Banner */
.coffee-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}

.coffee-card .section-header {
  margin-bottom: 24px;
}

.coffee-card .section-title {
  margin-bottom: 12px;
}

.coffee-card .section-desc {
  margin-bottom: 24px;
}

/* Simple text page (privacy, terms, 404, support) */
.page-content {
  padding: 64px 0 80px;
  flex: 1;
}

.page-header {
  margin-bottom: 40px;
}

.page-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.prose {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.prose p {
  margin-bottom: 20px;
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 36px 0 16px;
}

.notice-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
}

/* FAQ list */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 32px;
}

.faq-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.faq-question {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.faq-answer {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.faq-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.faq-answer a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.faq-answer ul {
  padding-left: 20px;
  margin-top: 8px;
}

.support-contact {
  background-color: var(--bg-surface);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  margin-bottom: 40px;
}

.support-lead {
  font-weight: 600;
  margin-bottom: 4px;
}

.support-subtext {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.support-email {
  display: inline-block;
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 8px;
  color: var(--accent-primary);
}

/* 404 Page */
.notfound-box {
  text-align: center;
  padding: 80px 20px;
  max-width: 500px;
  margin: 0 auto;
}

.notfound-code {
  font-size: 5rem;
  font-weight: 900;
  color: var(--accent-primary);
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: -0.05em;
}

.notfound-box .page-title,
.notfound-title {
  font-size: 1.75rem;
}

.notfound-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  padding: 40px 0;
  margin-top: auto;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-secondary);
}

.footer-link:hover {
  color: var(--text-primary);
}

/* Mobile Responsiveness (Down to 375px) */
@media (max-width: 768px) {
  .hero {
    padding: 48px 0 40px;
  }
  
  .hero-title {
    font-size: 1.85rem;
    line-height: 1.25;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
  }

  /* Mobile Navigation / Hamburger Menu */
  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 40px;
    height: 40px;
    padding: 9px 8px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
  }

  .nav-toggle:hover {
    background-color: var(--bg-subtle);
  }

  .hamburger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    width: 100%;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    align-items: stretch;
    padding: 16px 20px 24px;
    gap: 0;
    z-index: 99;
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-links {
    display: flex;
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: 14px 4px;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-subtle);
  }

  .nav-menu .lang-switch {
    margin-top: 16px;
    align-self: flex-start;
    padding: 10px 18px;
    font-size: 0.95rem;
  }

  /* Feature cards: single column on mobile */
  .grid-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .section {
    padding: 48px 0;
  }

  .privacy-box {
    padding: 28px 20px;
  }
  
  .footer-content {
    flex-direction: column;
    align-items: flex-start;
  }
}