/* SYE Desktop — design tokens from app UI */
:root {
  --bg-base: #0a0c14;
  --bg-surface: rgba(24, 28, 42, 0.92);
  --bg-elevated: rgba(36, 42, 62, 0.95);
  --accent-warm: #ffb07a;
  --accent-blue: #60a5fa;
  --accent-teal: #5eead4;
  --accent-violet: #a78bfa;
  --accent-glow: rgba(255, 176, 122, 0.18);
  --accent-blue-glow: rgba(96, 165, 250, 0.16);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --border-subtle: rgba(148, 163, 184, 0.12);
  --radius-card: 18px;
  --radius-btn: 12px;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.25), 0 12px 40px rgba(0, 0, 0, 0.35);
  --font-ui: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "DM Mono", ui-monospace, monospace;
  --max-width: 1120px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background:
    radial-gradient(ellipse 120% 80% at 100% 0%, rgba(96, 165, 250, 0.12), transparent 50%),
    radial-gradient(ellipse 90% 60% at 0% 100%, rgba(255, 176, 122, 0.1), transparent 45%),
    var(--bg-base);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #93c5fd;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 12, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.05rem;
}

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

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

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

.header-cta {
  display: flex;
  gap: 10px;
}

.header-cta-mobile {
  display: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-btn);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent-blue);
  color: #0a0c14;
  box-shadow: 0 0 24px var(--accent-blue-glow);
}

.btn-primary:hover {
  color: #0a0c14;
  background: #93c5fd;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  color: var(--text-primary);
  background: rgba(48, 54, 78, 0.95);
}

.btn-warm {
  background: linear-gradient(135deg, var(--accent-warm), #ff9a56);
  color: #0a0c14;
  box-shadow: 0 0 24px var(--accent-glow);
}

.btn-warm:hover {
  color: #0a0c14;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Hero */
.hero {
  padding: 80px 0 100px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--accent-blue-glow);
  border: 1px solid rgba(96, 165, 250, 0.25);
  color: var(--accent-blue);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 20px;
}

.hero-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-links a:hover {
  color: var(--accent-blue);
}

.hero-visual {
  position: relative;
}

.app-mockup {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.mockup-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.mockup-dot.red { background: #ff5f57; }
.mockup-dot.yellow { background: #febc2e; }
.mockup-dot.green { background: #28c840; }

.mockup-body {
  padding: 24px;
}

.mockup-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.mockup-tab {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: transparent;
}

.mockup-tab.active {
  background: var(--accent-blue-glow);
  color: var(--accent-blue);
}

.temp-presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.preset-card {
  padding: 14px 10px;
  border-radius: 12px;
  text-align: center;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.02);
}

.preset-card.active {
  border-color: rgba(255, 176, 122, 0.4);
  background: var(--accent-glow);
}

.preset-card .label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.preset-card .value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-warm);
}

.slider-row {
  margin-bottom: 16px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.slider-track {
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, #ffb07a, #60a5fa);
  position: relative;
}

.slider-thumb {
  position: absolute;
  top: 50%;
  left: 55%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.timer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
}

.timer-row .timer-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.timer-row .timer-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-teal);
}

/* Sections */
section {
  padding: 80px 0;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 48px;
}

/* Feature cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: rgba(96, 165, 250, 0.25);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.feature-icon.warm { background: var(--accent-glow); }
.feature-icon.blue { background: var(--accent-blue-glow); }
.feature-icon.teal { background: rgba(94, 234, 212, 0.15); }
.feature-icon.violet { background: rgba(167, 139, 250, 0.15); }

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.feature-list li {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding-left: 18px;
  position: relative;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-blue);
}

/* Preset table */
.preset-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-card);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.preset-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.preset-table th,
.preset-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.preset-table th {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.preset-table td {
  color: var(--text-secondary);
}

.preset-table td:first-child {
  color: var(--text-primary);
  font-weight: 500;
}

.preset-table tr:last-child td {
  border-bottom: none;
}

.preset-table .kelvin {
  font-family: var(--font-mono);
  color: var(--accent-warm);
}

/* How it works */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step {
  text-align: center;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-blue-glow);
  border: 1px solid rgba(96, 165, 250, 0.3);
  color: var(--accent-blue);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.step h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

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

/* Privacy block */
.privacy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.privacy-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.privacy-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.privacy-list li::before {
  content: "✓";
  color: var(--accent-teal);
  font-weight: 600;
  flex-shrink: 0;
}

.privacy-note {
  padding: 20px;
  border-radius: var(--radius-card);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.privacy-note a {
  color: var(--accent-blue);
}

/* FAQ */
.faq-list {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-btn);
  background: var(--bg-surface);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}

.faq-question:hover {
  background: rgba(255, 255, 255, 0.02);
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 20px 18px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Download section */
.download-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.download-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.download-card {
  padding: 32px;
  border-radius: var(--radius-card);
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
}

.download-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.download-card ul {
  list-style: none;
  margin-bottom: 24px;
}

.download-card li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 6px 0;
  padding-left: 16px;
  position: relative;
}

.download-card li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent-blue);
}

.shortcut-hint {
  margin-top: 32px;
  padding: 16px 20px;
  border-radius: var(--radius-btn);
  background: rgba(96, 165, 250, 0.08);
  border: 1px solid rgba(96, 165, 250, 0.2);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.shortcut-hint kbd {
  font-family: var(--font-mono);
  background: var(--bg-base);
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 0.85rem;
}

/* Platform page */
.platform-hero {
  padding: 60px 0 40px;
  text-align: center;
}

.platform-hero h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 16px;
}

.platform-hero p {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
}

.requirements-card {
  max-width: 640px;
  margin: 0 auto 48px;
  padding: 32px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-card);
  text-align: left;
}

.requirements-card h2 {
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.requirements-card ul {
  list-style: none;
}

.requirements-card li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.requirements-card li:last-child {
  border-bottom: none;
}

.coming-soon-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(167, 139, 250, 0.15);
  color: var(--accent-violet);
  font-size: 0.75rem;
  font-weight: 500;
  margin-left: 8px;
  vertical-align: middle;
}

.btn-unavailable {
  pointer-events: none;
  opacity: 0.55;
  cursor: default;
}

/* Footer */
.site-footer {
  padding: 60px 0 32px;
  border-top: 1px solid var(--border-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 8px;
}

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

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

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

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

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.version-stamp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* Mobile nav */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

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

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

  .download-cards {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .nav-links,
  .header-cta {
    display: none;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(10, 12, 20, 0.98);
    padding: 24px;
    border-bottom: 1px solid var(--border-subtle);
    gap: 16px;
  }

  .header-cta.mobile-visible {
    display: flex;
    flex-direction: column;
    width: 100%;
    padding: 0 24px 24px;
    background: rgba(10, 12, 20, 0.98);
  }

  .menu-toggle {
    display: block;
  }

  .site-header {
    position: relative;
  }

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

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

  .hero {
    padding: 48px 0 64px;
  }

  section {
    padding: 56px 0;
  }
}

/* Legal pages */
.legal-page {
  padding: 48px 0 80px;
}

.legal-page .container {
  max-width: 720px;
}

.legal-page h1 {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.legal-meta {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 40px;
}

.legal-body h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--text-primary);
}

.legal-body p,
.legal-body li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.legal-body ul {
  margin: 0 0 16px 20px;
}

.legal-body a {
  color: var(--accent-blue);
}

.install-note {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--radius-btn);
  background: rgba(96, 165, 250, 0.08);
  border: 1px solid rgba(96, 165, 250, 0.2);
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 520px;
}

.install-note strong {
  color: var(--text-primary);
}

.install-note a {
  color: var(--accent-blue);
}

.install-warning {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--radius-btn);
  background: rgba(255, 176, 122, 0.1);
  border: 1px solid rgba(255, 176, 122, 0.35);
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: 640px;
}

.install-warning strong {
  color: var(--accent-warm);
}

.install-steps {
  counter-reset: step;
  list-style: none;
  margin: 24px 0;
  padding: 0;
}

.install-steps li {
  counter-increment: step;
  position: relative;
  padding: 16px 16px 16px 52px;
  margin-bottom: 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-btn);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

.install-steps li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-blue-glow);
  border: 1px solid rgba(96, 165, 250, 0.3);
  color: var(--accent-blue);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.install-steps code,
.legal-body code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--bg-base);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.install-steps pre {
  margin-top: 10px;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
}

.install-steps pre code {
  display: block;
  padding: 0;
  border: none;
  background: none;
  white-space: pre-wrap;
  word-break: break-all;
}