/* Reset + Variables */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  font-size: 1rem; line-height: 1.6; color: #E0E0E0; background: #0B0C10; min-height: 100vh;
  display: flex; flex-direction: column;
}
:root {
  --color-bg-main: #0B0C10;
  --color-bg-card: #5A2D8C;
  --color-bg-overlay: #1A0A2E;
  --color-accent: #D4AF37;
  --color-accent-dark: #B8860B;
  --color-link: #9B59B6;
  --color-text: #E0E0E0;
  --color-text-white: #FFFFFF;
  --color-border: #D4AF37;
  --radius-capsule: 9999px;
  --radius-card: 16px;
  --max-width: 1200px;
  --header-height: 60px;
}
a { color: var(--color-link); transition: color 0.2s; }
a:hover, a:focus-visible { color: var(--color-accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* Skip Link */
.skip-link {
  position: absolute; top: -100px; left: 8px; z-index: 1000;
  background: var(--color-accent); color: #0B0C10; padding: 0.5rem 1rem; border-radius: var(--radius-capsule);
  font-weight: bold; text-decoration: none;
}
.skip-link:focus { top: 8px; }

/* Header – floating capsule */
.site-header {
  position: sticky; top: 16px; z-index: 900;
  padding: 0 16px; pointer-events: none;
}
.site-header__inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(26,10,46,0.85); backdrop-filter: blur(12px);
  border: 1px solid var(--color-border); border-radius: var(--radius-capsule);
  padding: 0 20px; height: var(--header-height);
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  pointer-events: auto;
}
.brand {
  font-size: 1.5rem; font-weight: bold; color: var(--color-text-white);
  text-decoration: none; letter-spacing: 0.05em;
  background: linear-gradient(135deg, var(--color-accent), var(--color-text-white));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.brand:hover, .brand:focus-visible { color: var(--color-accent); }

/* Navigation */
.nav__list { display: flex; gap: 0.5rem; }
.nav__list a {
  display: inline-block; padding: 0.4rem 1rem; border-radius: var(--radius-capsule);
  color: var(--color-text-white); text-decoration: none; font-size: 0.9rem;
  transition: background 0.2s, color 0.2s;
}
.nav__list a:hover, .nav__list a:focus-visible { background: rgba(212,175,55,0.15); color: var(--color-accent); }
.nav__list a[aria-current="page"] { background: var(--color-accent); color: #0B0C10; font-weight: bold; }

/* Mobile nav toggle */
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer; padding: 4px;
  flex-direction: column; justify-content: center; gap: 4px;
}
.nav-toggle__bar { display: block; width: 24px; height: 3px; background: var(--color-text-white); border-radius: 2px; transition: transform 0.3s; }
[data-open] .nav-toggle__bar:nth-child(1) { transform: rotate(45deg) translate(4px,4px); }
[data-open] .nav-toggle__bar:nth-child(2) { opacity: 0; }
[data-open] .nav-toggle__bar:nth-child(3) { transform: rotate(-45deg) translate(4px,-4px); }

/* Footer */
.site-footer {
  background: var(--color-bg-main); border-top: 2px solid var(--color-accent-dark);
  margin-top: auto; padding: 2rem 1rem;
}
.site-footer__inner {
  max-width: var(--max-width); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 2rem;
}
.site-footer__brand .brand { font-size: 1.25rem; }
.site-footer__nav ul { display: flex; flex-direction: column; gap: 0.5rem; }
.site-footer__nav a { color: var(--color-text); text-decoration: none; transition: color 0.2s; }
.site-footer__nav a:hover { color: var(--color-accent); }
.site-footer__contact { display: flex; flex-direction: column; gap: 0.4rem; color: var(--color-text); }
.site-footer__contact a { color: var(--color-link); }
.site-footer__icp { grid-column: 1 / -1; text-align: center; padding-top: 1rem; border-top: 1px solid var(--color-accent-dark); color: var(--color-text); font-size: 0.875rem; }

/* Common components */
.page-container { max-width: var(--max-width); margin: 0 auto; padding: 2rem 1rem; }
.section-panel { background: var(--color-bg-overlay); border-radius: var(--radius-card); padding: 2rem; margin-bottom: 2rem; box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
.section-panel--wide { margin-left: -1rem; margin-right: -1rem; } /* 视宽 */
.section-panel--narrow { max-width: 800px; margin-left: auto; margin-right: auto; }
.card { background: var(--color-bg-card); border-radius: var(--radius-card); padding: 1.5rem; transition: transform 0.2s, box-shadow 0.2s; box-shadow: 0 4px 12px rgba(0,0,0,0.3); }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.5); }
.btn {
  display: inline-block; padding: 0.6rem 2rem; border-radius: var(--radius-capsule);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: #0B0C10; font-weight: bold; text-decoration: none; border: none; cursor: pointer;
  transition: filter 0.2s, transform 0.2s; font-size: 1rem;
}
.btn:hover, .btn:focus-visible { filter: brightness(1.2); transform: scale(1.02); }
.tag {
  display: inline-block; padding: 0.2rem 0.8rem; border-radius: var(--radius-capsule);
  background: var(--color-link); color: var(--color-text-white); font-size: 0.8rem;
}
.breadcrumb { display: flex; gap: 0.5rem; align-items: center; padding: 0.5rem 0; font-size: 0.875rem; color: var(--color-text); }
.breadcrumb a { color: var(--color-link); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb > *+*::before { content: "›"; margin-right: 0.5rem; color: var(--color-accent-dark); }

/* Scroll Progress (金色细线) */
[data-scroll-progress] { position: relative; }
[data-scroll-progress]::after {
  content: ''; position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-dark));
  z-index: 999; transition: width 0.1s linear;
}

/* Responsive */
@media (max-width: 768px) {
  .site-header { top: 8px; }
  .nav-toggle { display: flex; }
  .nav { position: absolute; top: calc(var(--header-height) + 8px); left: 16px; right: 16px; background: rgba(26,10,46,0.95); backdrop-filter: blur(12px); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 1rem; display: none; }
  [data-open] .nav { display: block; }
  .nav__list { flex-direction: column; gap: 0.25rem; }
  .nav__list a { display: block; padding: 0.6rem 1rem; }
  .site-footer__inner { grid-template-columns: 1fr; gap: 1.5rem; text-align: center; }
  .site-footer__nav ul { align-items: center; }
}
@media (max-width: 480px) {
  .site-header__inner { padding: 0 12px; }
  .brand { font-size: 1.25rem; }
}

/* Focus visible */
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0s !important; animation-duration: 0s !important; }
  html { scroll-behavior: auto; }
  .card:hover { transform: none; }
}