:root {
  --color-primary: #0B1A30;
  --color-accent: #FF6B35;
  --color-violet: #7B2FBE;
  --color-aux1: #A8D0E6;
  --color-aux2: #1B3B6F;
  --color-bg-gradient: #200A3A;
  --color-text: #FFFFFF;
  --color-highlight: #FFD700;
  --color-neutral: #EAEAEA;
  --font-display: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif;
  --font-body: 'Source Sans Pro', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --container-max: 1200px;
  --header-height: 72px;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-glow: 0 4px 24px rgba(255, 107, 53, 0.25);
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--color-primary);
}

body {
  font-family: var(--font-body);
  background-color: var(--color-primary);
  background-image:
    radial-gradient(circle at 15% 85%, rgba(123, 47, 190, 0.28) 0%, transparent 50%),
    radial-gradient(circle at 85% 15%, rgba(255, 107, 53, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 100% 100%, rgba(168, 208, 230, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

:focus-visible {
  outline: 3px solid var(--color-highlight);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: #fff;
  padding: 8px 20px;
  z-index: 10000;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border-bottom-right-radius: 12px;
}
.skip-link:focus {
  left: 0;
}

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

.header-topbar {
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid rgba(168, 208, 230, 0.1);
  padding-block: 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
}
.header-topbar-inner {
  display: flex;
  justify-content: flex-end;
  gap: 32px;
  color: var(--color-aux1);
}
.header-topbar-inner span + span::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-accent);
  margin-right: 32px;
  vertical-align: middle;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 26, 48, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(168, 208, 230, 0.15);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}
.brand-icon {
  font-size: 30px;
  line-height: 1;
  color: var(--color-accent);
  text-shadow: 0 0 24px rgba(255, 107, 53, 0.5);
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  letter-spacing: 0.01em;
}
.brand-sub {
  font-size: 11px;
  color: var(--color-aux1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav-toggle {
  display: none;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: rgba(168, 208, 230, 0.05);
  border: 1px solid rgba(168, 208, 230, 0.2);
  border-radius: 14px;
  cursor: pointer;
  transition: border-color var(--transition-base);
}
.nav-toggle:hover {
  border-color: var(--color-accent);
}
.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-text);
  content: '';
  transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
}
.nav-toggle-icon {
  position: relative;
}
.nav-toggle-icon::before {
  position: absolute;
  top: -6px;
  left: 0;
}
.nav-toggle-icon::after {
  position: absolute;
  bottom: -6px;
  left: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background: transparent;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
  bottom: 0;
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 4px;
  align-items: center;
}
.site-nav a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  color: var(--color-neutral);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-pill);
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-base);
  white-space: nowrap;
}
.site-nav a:hover {
  background: rgba(255, 107, 53, 0.12);
  color: var(--color-accent);
  transform: translateY(-1px);
}
.site-nav a[aria-current="page"] {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.nav-index {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  color: var(--color-accent);
  margin-right: 6px;
  font-family: 'SF Mono', 'Cascadia Code', Consolas, monospace;
  letter-spacing: 0.05em;
}
.site-nav a[aria-current="page"] .nav-index {
  color: #fff;
}

.site-footer {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(11, 26, 48, 0.95), rgba(32, 10, 58, 0.98));
  border-top: 1px solid rgba(255, 107, 53, 0.2);
  padding-top: 56px;
  margin-top: 80px;
}
.site-footer::before {
  content: 'XINGKONG';
  position: absolute;
  right: -40px;
  bottom: -60px;
  font-size: 200px;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.025);
  pointer-events: none;
  font-family: var(--font-display);
  letter-spacing: -0.04em;
  line-height: 1;
}
.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand .brand-icon {
  font-size: 36px;
}
.footer-brand .brand-name {
  font-size: 24px;
}
.footer-tagline {
  margin-top: 16px;
  color: var(--color-aux1);
  font-size: 15px;
  line-height: 1.7;
  max-width: 30ch;
}
.footer-grid h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-text);
  letter-spacing: 0.05em;
  position: relative;
  padding-bottom: 10px;
}
.footer-grid h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 3px;
  border-radius: 4px;
  background: var(--color-accent);
}
.footer-grid ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-grid a {
  color: var(--color-neutral);
  text-decoration: none;
  transition: color var(--transition-base), padding-left var(--transition-base);
  position: relative;
}
.footer-grid a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}
.footer-bottom {
  position: relative;
  z-index: 1;
  margin-top: 48px;
  padding-block: 24px;
  border-top: 1px solid rgba(168, 208, 230, 0.1);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
  color: var(--color-aux1);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 16px;
  line-height: 1;
  text-decoration: none;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  border: none;
  cursor: pointer;
  font-family: var(--font-display);
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(255, 107, 53, 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 2px solid rgba(168, 208, 230, 0.5);
}
.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(145deg, var(--color-aux2), var(--color-bg-gradient));
  position: relative;
}
.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-placeholder {
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-aux1);
  font-size: 14px;
  letter-spacing: 0.05em;
  background:
    radial-gradient(circle at 30% 30%, rgba(255, 107, 53, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(123, 47, 190, 0.3) 0%, transparent 50%);
}

[data-progress] {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-highlight));
  box-shadow: 0 0 12px rgba(255, 107, 53, 0.6);
  z-index: 10000;
  transition: width 0.1s linear;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .footer-tagline {
    max-width: 40ch;
  }
}

@media (max-width: 768px) {
  .container {
    padding-inline: 20px;
  }
  .header-topbar-inner {
    justify-content: center;
  }
  .header-topbar-inner span + span::before {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(11, 26, 48, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 16px 24px 28px;
    border-bottom: 1px solid rgba(168, 208, 230, 0.15);
    box-shadow: 0 32px 48px rgba(0, 0, 0, 0.3);
  }
  .site-nav[data-open] {
    display: block;
  }
  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .site-nav a {
    display: flex;
    align-items: center;
    padding: 14px 18px;
    font-size: 17px;
    border-radius: 16px;
  }
  .site-nav a:hover {
    background: rgba(255, 107, 53, 0.08);
  }
  .site-nav a[aria-current="page"] {
    background: var(--color-accent);
    color: #fff;
  }
  .site-footer {
    margin-top: 48px;
    padding-top: 40px;
  }
  .site-footer::before {
    font-size: 120px;
    right: -20px;
    bottom: -30px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    min-height: 64px;
  }
  .brand-name {
    font-size: 18px;
  }
  .brand-sub {
    font-size: 10px;
  }
  .brand-icon {
    font-size: 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@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;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
  [data-progress] {
    display: none;
  }
}