/* ═══════════════════════════════════════════════
   Sigilum — Unified Style Sheet
   Black, White & Gold Minimalist Theme
   ═══════════════════════════════════════════════ */

/* ──────────── Reset & Base ──────────── */

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

:root {
  --color-bg: #0a0a0a;
  --color-bg-alt: #111111;
  --color-bg-card: #141414;
  --color-surface: #1a1a1a;
  --color-text: #e8e4e0;
  --color-text-secondary: #99948e;
  --color-text-muted: #66625c;
  --color-gold: #c0a060;
  --color-gold-light: #d4b87a;
  --color-gold-dim: rgba(192, 160, 96, 0.15);
  --color-border: rgba(255, 255, 255, 0.06);
  --color-border-light: rgba(255, 255, 255, 0.1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --font-size-6xl: 5rem;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  --max-width: 1200px;
  --nav-height: 68px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  overflow-x: hidden;
  cursor: default;
}

/* ──────────── Mouse Follower Glow ──────────── */

#cursor-glow {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(192, 160, 96, 0.04) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  will-change: transform, opacity;
  opacity: 0;
  transition: opacity 0.6s ease;
}

#cursor-glow.visible {
  opacity: 1;
}

@media (hover: none) and (pointer: coarse) {
  #cursor-glow {
    display: none;
  }
}

/* Chinese font fallback */
html[lang="zh-Hans"] body,
html[lang="zh"] body {
  font-family: 'Noto Sans SC', var(--font-sans);
}

html[lang="zh-Hant"] body,
html[lang="zh-TW"] body {
  font-family: 'Noto Sans TC', var(--font-sans);
}

html[lang="ja"] body {
  font-family: 'Noto Sans JP', var(--font-sans);
}

/* ──────────── Container ──────────── */

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

/* ──────────── Navigation ──────────── */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  letter-spacing: 1px;
}

.logo-icon {
  color: var(--color-gold);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  letter-spacing: 0.5px;
  transition: color var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition);
}

.nav-link:hover {
  color: var(--color-gold);
}

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

.nav-cta {
  text-decoration: none;
  color: var(--color-bg);
  background: var(--color-gold);
  padding: 0.5rem 1.25rem;
  border-radius: 4px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: background var(--transition), transform var(--transition);
}

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

/* ──────────── Language Selector ──────────── */

.lang-selector {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0.35rem 0.5rem;
  transition: color var(--transition), border-color var(--transition);
}

.lang-btn:hover {
  color: var(--color-gold);
  border-color: var(--color-gold-dim);
}

.lang-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  min-width: 160px;
  list-style: none;
  padding: 0.35rem 0;
  z-index: 200;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.lang-dropdown.visible {
  display: block;
}

.lang-option {
  display: block;
  padding: 0.5rem 1rem;
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  transition: background var(--transition), color var(--transition);
}

.lang-option:hover {
  background: var(--color-gold-dim);
  color: var(--color-gold);
}

.lang-option.active {
  color: var(--color-gold);
  font-weight: 500;
}

/* ──────────── Mobile Menu ──────────── */

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

.menu-line {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

/* ──────────── Hero Section ──────────── */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: calc(var(--nav-height) + var(--spacing-3xl)) var(--spacing-xl) var(--spacing-3xl);
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(192, 160, 96, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.hero-container {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  border: 1px solid var(--color-gold-dim);
  border-radius: 100px;
  padding: 0.4rem 1rem;
  font-size: var(--font-size-xs);
  color: var(--color-gold);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: var(--spacing-xl);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: var(--font-size-6xl);
  font-weight: 400;
  letter-spacing: 8px;
  color: var(--color-text);
  line-height: 1.1;
  margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-size: var(--font-size-2xl);
  font-weight: 300;
  color: var(--color-gold);
  letter-spacing: 4px;
  font-style: italic;
  margin-bottom: var(--spacing-lg);
}

.hero-tagline {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-md);
  line-height: 1.5;
}

.hero-description {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  max-width: 540px;
  margin: 0 auto var(--spacing-2xl);
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-canvas-container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.15;
  pointer-events: none;
}

#sigilCanvas {
  width: 300px;
  height: 300px;
}

/* ──────────── Buttons ──────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 4px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.5px;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-gold);
  color: var(--color-bg);
  border: 1px solid var(--color-gold);
}

.btn-primary:hover {
  background: var(--color-gold-light);
  border-color: var(--color-gold-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(192, 160, 96, 0.25);
}

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

.btn-secondary:hover {
  color: var(--color-gold);
  border-color: var(--color-gold-dim);
}

.btn-large {
  padding: 1rem 2.5rem;
  font-size: var(--font-size-base);
}

/* ──────────── Screenshots Showcase ──────────── */

.screenshots {
  padding: var(--spacing-4xl) 0;
  background: var(--color-bg-alt);
  overflow: hidden;
}

.screenshot-showcase {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xl);
  max-width: 960px;
  margin: 0 auto;
  padding: var(--spacing-lg) 0;
}

.screenshot-device {
  position: relative;
  width: 220px;
  border-radius: 20px;
  overflow: hidden;
  border: 2px solid var(--color-border);
  background: var(--color-bg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}

.screenshot-device:hover {
  transform: translateY(-12px) scale(1.04);
  box-shadow: 0 20px 48px rgba(192, 160, 96, 0.2), 0 0 30px rgba(192, 160, 96, 0.08);
  border-color: var(--color-gold-light);
}

.screenshot-device:first-child {
  transform: scale(1.08);
  z-index: 1;
}

.screenshot-device:first-child:hover {
  transform: scale(1.08) translateY(-12px);
  box-shadow: 0 20px 48px rgba(192, 160, 96, 0.25), 0 0 40px rgba(192, 160, 96, 0.1);
}

.screenshot-notch {
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 5px;
  background: var(--color-bg);
  border-radius: 0 0 10px 10px;
  z-index: 2;
}

.screenshot-device img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
}

@media (max-width: 768px) {
  .screenshot-showcase {
    gap: var(--spacing-md);
    padding: var(--spacing-md);
  }
  .screenshot-device {
    width: 160px;
    border-radius: 16px;
  }
  .screenshot-device img {
    border-radius: 14px;
  }
  .screenshot-notch {
    width: 50px;
    height: 4px;
  }
}

@media (max-width: 480px) {
  .screenshot-device:last-child {
    display: none;
  }
  .screenshot-device {
    width: 165px;
  }
}

/* ──────────── Section Titles ──────────── */

.section-title {
  font-family: var(--font-serif);
  font-size: var(--font-size-3xl);
  font-weight: 400;
  text-align: center;
  color: var(--color-text);
  letter-spacing: 2px;
  margin-bottom: var(--spacing-3xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 1px;
  background: var(--color-gold);
  margin: var(--spacing-md) auto 0;
}

/* ──────────── Features Section ──────────── */

.features {
  padding: var(--spacing-4xl) 0;
  background: var(--color-bg-alt);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--spacing-xl);
  transition: border-color var(--transition), transform var(--transition);
  opacity: 0;
  transform: translateY(20px);
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--transition-slow), transform var(--transition-slow), border-color var(--transition);
}

.feature-card:hover {
  border-color: var(--color-gold-dim);
  transform: translateY(-4px);
}

.feature-icon {
  color: var(--color-gold);
  margin-bottom: var(--spacing-md);
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.5px;
}

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

/* ──────────── How It Works Section ──────────── */

.how-it-works {
  padding: var(--spacing-4xl) 0;
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.step-card {
  text-align: center;
  padding: var(--spacing-xl);
  position: relative;
  opacity: 0;
  transform: translateY(20px);
}

.step-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.step-number {
  font-family: var(--font-serif);
  font-size: var(--font-size-4xl);
  color: var(--color-gold);
  opacity: 0.3;
  margin-bottom: var(--spacing-md);
  font-weight: 400;
  line-height: 1;
}

.step-title {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.5px;
}

.step-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ──────────── CTA Section ──────────── */

.cta-section {
  padding: var(--spacing-4xl) 0;
  text-align: center;
  background: var(--color-bg-alt);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 400px;
  height: 400px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(192, 160, 96, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: var(--font-size-3xl);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: 2px;
  margin-bottom: var(--spacing-md);
}

.cta-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ──────────── FAQ Section ──────────── */

.faq {
  padding: var(--spacing-4xl) 0;
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(10px);
}

.faq-item.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) 0;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: var(--font-size-base);
  font-weight: 400;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--color-gold);
}

.faq-arrow {
  flex-shrink: 0;
  color: var(--color-text-muted);
  transition: transform var(--transition);
}

.faq-question[aria-expanded="true"] .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition);
}

.faq-answer p {
  padding-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.8;
}

/* ──────────── Footer ──────────── */

.footer {
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid var(--color-border);
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  letter-spacing: 1px;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.5px;
  transition: color var(--transition);
}

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

.footer-developer {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

.footer-legal {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-legal a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  transition: color var(--transition);
}

.footer-legal a:hover {
  color: var(--color-gold);
}

.footer-copyright {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  opacity: 0.6;
}

/* ──────────── Responsive ──────────── */

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-6xl: 3rem;
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
    --spacing-4xl: 3rem;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--spacing-xl);
    gap: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
  }

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

  .mobile-menu-btn {
    display: flex;
  }

  .hero-title {
    letter-spacing: 4px;
  }

  .hero-subtitle {
    font-size: var(--font-size-xl);
  }

  .hero-tagline {
    font-size: var(--font-size-base);
  }

  .hero-canvas-container {
    display: none;
  }

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

  .steps-container {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .cta-title {
    font-size: var(--font-size-2xl);
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-6xl: 2.5rem;
    --spacing-xl: 1.25rem;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .hero {
    padding-top: calc(var(--nav-height) + var(--spacing-2xl));
  }

  .hero-title {
    letter-spacing: 3px;
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }
}

/* ──────────── Selection ──────────── */

::selection {
  background: rgba(192, 160, 96, 0.3);
  color: var(--color-text);
}

/* ──────────── Scrollbar ──────────── */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gold-dim);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gold);
}