:root {
  --bg-deep: #0A0E17;
  --bg-secondary: #1B2A41;
  --gold: #F5B301;
  --red: #E63946;
  --cyan: #2AC3C4;
  --green: #10B981;
  --white: #F8F9FA;
  --gray: #9CA3AF;
  --wine: #800020;
  --font-display: Impact, 'Arial Black', 'Noto Sans SC Black', sans-serif;
  --font-body: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --header-height: 4rem;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --transition: 0.2s ease;
}

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

html {
  background-color: var(--bg-deep);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: transparent;
  color: var(--white);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 195, 196, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 195, 196, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

::selection {
  background: var(--gold);
  color: var(--bg-deep);
}

::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--bg-secondary);
  border-radius: 4px;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 1000;
  background: var(--gold);
  color: var(--bg-deep);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  transform: translateY(-300%);
  transition: transform 0.25s ease;
  box-shadow: 0 4px 16px rgba(245, 179, 1, 0.4);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(42, 195, 196, 0.15);
}

.header-inner {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.scroll-progress {
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, var(--cyan), var(--gold));
  transform: scaleX(0);
  transform-origin: left;
  z-index: 10;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo {
  display: block;
  width: 2rem;
  height: 2rem;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--white);
  white-space: nowrap;
}

.brand-name em {
  font-style: italic;
  color: var(--gold);
}

/* ---------- Sync Status ---------- */
.sync-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green);
  transition: border-color var(--transition), box-shadow var(--transition), color var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

.sync-status:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 12px rgba(42, 195, 196, 0.2);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  flex-shrink: 0;
}

.sync-status.is-syncing {
  border-color: var(--cyan);
  color: var(--cyan);
}

.sync-status.is-syncing .status-dot {
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  animation: pulse 0.8s ease-in-out infinite alternate;
}

@keyframes pulse {
  from {
    transform: scale(1);
    opacity: 1;
  }
  to {
    transform: scale(1.5);
    opacity: 0.5;
  }
}

/* ---------- Header Shortcuts ---------- */
.header-shortcuts {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
}

.shortcut-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--red);
  color: var(--white);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  transition: background var(--transition), transform 0.15s ease, box-shadow var(--transition);
  box-shadow: 0 2px 8px rgba(230, 57, 70, 0.35);
  white-space: nowrap;
}

.shortcut-btn:hover {
  background: #ff4d5a;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(230, 57, 70, 0.4);
}

.shortcut-btn.accent {
  background: var(--gold);
  color: var(--bg-deep);
  box-shadow: 0 2px 8px rgba(245, 179, 1, 0.3);
}

.shortcut-btn.accent:hover {
  background: #ffc72e;
  box-shadow: 0 4px 16px rgba(245, 179, 1, 0.5);
}

.shortcut-icon {
  display: inline-block;
  font-size: 0.85rem;
  line-height: 1;
}

/* ---------- Mobile Nav Toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--gray);
  border-radius: 10px;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  color: var(--white);
  transition: border-color var(--transition);
}

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

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle-box span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--white);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle-text {
  font-size: 0.6rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ---------- Command Bar / Nav ---------- */
.command-bar {
  display: flex;
  align-items: center;
  margin-left: 0;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--gray);
  text-decoration: none;
  border-radius: 8px;
  position: relative;
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.2rem;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.nav-link:hover {
  color: var(--white);
  background: rgba(245, 179, 1, 0.06);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--gold);
  background: rgba(245, 179, 1, 0.1);
  box-shadow: inset 0 0 0 1px rgba(245, 179, 1, 0.25);
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--cyan);
}

.nav-index {
  font-size: 0.6rem;
  color: var(--cyan);
  opacity: 0.8;
  line-height: 1;
}

/* ---------- Footer ---------- */
.site-footer {
  background: linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-secondary) 100%);
  border-top: 1px solid rgba(42, 195, 196, 0.2);
  margin-top: 4rem;
}

.footer-bottom {
  border-top: 1px solid rgba(156, 163, 175, 0.08);
}

.footer-bottom:first-child {
  border-top: 0;
}

.footer-bottom-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--gray);
}

.footer-brand-text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--white);
  text-decoration: none;
  line-height: 1;
}

.footer-brand-text em {
  color: var(--gold);
  font-style: italic;
}

.footer-sync-msg {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--green);
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

.footer-sync-msg .status-dot {
  width: 6px;
  height: 6px;
  box-shadow: 0 0 6px var(--green);
}

.footer-grid {
  max-width: 1280px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.25fr;
  gap: 2.5rem;
  align-items: start;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(245, 179, 1, 0.2);
}

.footer-title::before {
  content: '// ';
  color: var(--cyan);
}

.footer-about p {
  font-size: 0.85rem;
  color: var(--gray);
  line-height: 1.7;
}

.footer-trust {
  margin-top: 1rem;
  padding: 0.75rem;
  border-left: 2px solid var(--cyan);
  background: rgba(42, 195, 196, 0.04);
  font-size: 0.75rem;
  color: var(--gray);
  line-height: 1.7;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-col ul a {
  color: var(--gray);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
}

.footer-col ul a:hover {
  color: var(--gold);
  padding-left: 4px;
}

.footer-col address {
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--gray);
}

.mono {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-weight: 400;
}

/* ---------- Generic Components ---------- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: background var(--transition), box-shadow var(--transition), transform 0.15s ease, border-color var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  line-height: 1.2;
}

.btn-gold {
  background: var(--gold);
  color: var(--bg-deep);
}

.btn-gold:hover {
  background: #ffc72e;
  box-shadow: 0 4px 16px rgba(245, 179, 1, 0.4);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  background: rgba(42, 195, 196, 0.1);
  box-shadow: 0 4px 16px rgba(42, 195, 196, 0.2);
  transform: translateY(-1px);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  list-style: none;
  font-size: 0.8rem;
  color: var(--gray);
}

.breadcrumb li + li::before {
  content: '/ ';
  margin-right: 0.5rem;
  color: var(--cyan);
}

.breadcrumb a {
  color: var(--gray);
  text-decoration: none;
  transition: color var(--transition);
}

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

.breadcrumb li[aria-current="page"] {
  color: var(--white);
  font-weight: 500;
}

.card {
  background: linear-gradient(135deg, rgba(27, 42, 65, 0.8), rgba(10, 14, 23, 0.92));
  border: 1px solid rgba(156, 163, 175, 0.15);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform 0.2s ease, border-color var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(42, 195, 196, 0.5);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }

  .brand {
    order: 1;
  }

  .sync-status {
    order: 2;
    margin-left: auto;
  }

  .nav-toggle {
    display: flex;
    order: 3;
  }

  .header-shortcuts {
    order: 4;
    width: 100%;
    margin-left: 0;
    justify-content: center;
  }

  .shortcut-btn {
    flex: 1;
    justify-content: center;
    text-align: center;
    max-width: 12rem;
  }

  .command-bar {
    display: none;
    order: 5;
    flex-basis: 100%;
    margin-left: 0;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(156, 163, 175, 0.1);
  }

  .command-bar[data-open] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    width: 100%;
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 0.75rem 0.5rem;
    font-size: 0.9rem;
  }

  .nav-link::after {
    left: 0.5rem;
    right: 0.5rem;
    bottom: auto;
    top: 50%;
    width: 2px;
    height: 1.5rem;
    transform: scaleY(0);
    transform-origin: top;
  }

  .nav-link:hover::after,
  .nav-link[aria-current="page"]::after {
    transform: scaleY(1);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem 1rem;
  }

  .footer-bottom-inner {
    padding: 0.75rem 1rem;
    justify-content: center;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 1.2rem;
  }

  .sync-status {
    padding: 0.3rem 0.6rem;
    font-size: 0.7rem;
  }

  .sync-text {
    display: none;
  }

  .sync-status .status-dot {
    width: 10px;
    height: 10px;
  }

  .shortcut-btn {
    font-size: 0.7rem;
    padding: 0.35rem 0.5rem;
  }
}

/* ---------- Motion Accessibility ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}