/* ===== 星空赛事 — 共享样式表 ===== */
:root {
  --primary: #0B1A3A;
  --primary-gradient: linear-gradient(135deg, #0B1A3A 0%, #1A2D5A 100%);
  --secondary: #5B2D8E;
  --accent: #D4AF37;
  --background: #060E1E;
  --surface: #112240;
  --text-primary: #E2E8F0;
  --text-secondary: #94A3B8;
  --border: #1E3A5F;
  --success: #22C55E;
  --warning: #EAB308;
  --error: #EF4444;
  --font-heading: 'Orbitron', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
  --header-height: 120px;
  --content-max-width: 1280px;
  --gap: 1.5rem;
  --radius: 6px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::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: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--background);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: #e0c060; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

img { display: block; max-width: 100%; height: auto; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 700; line-height: 1.2; color: var(--text-primary); }
h1 { font-size: 3.5rem; letter-spacing: 0.02em; }
h2 { font-size: 2.5rem; letter-spacing: 0.01em; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }
p { margin-bottom: 1rem; color: var(--text-secondary); }

::selection { background: var(--accent); color: var(--primary); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

/* ===== Skip Link ===== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  padding: 0.5rem 1.2rem;
  background: var(--accent);
  color: var(--primary);
  font-weight: 700;
  border-radius: var(--radius);
  z-index: 10000;
  transition: top 0.3s ease;
  font-size: 0.9rem;
}
.skip-link:focus { top: 0.5rem; color: var(--primary); }

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9000;
  background: var(--primary-gradient);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 30px rgba(0,0,0,0.4);
  padding: 0;
}
.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 2rem;
  max-width: var(--content-max-width);
  margin: 0 auto;
  width: 100%;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.brand-mark {
  font-size: 1.8rem;
  color: var(--accent);
  line-height: 1;
  text-shadow: 0 0 12px rgba(212,175,55,0.5);
}
.brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}
.brand-tagline {
  font-size: 0.8rem;
  color: var(--accent);
  font-family: var(--font-body);
  letter-spacing: 0.08em;
  opacity: 0.85;
  margin-left: 0.5rem;
  padding-left: 0.5rem;
  border-left: 1px solid var(--border);
  display: none;
}
@media (min-width: 640px) {
  .brand-tagline { display: inline-block; }
}
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 9100;
}
.nav-toggle-bar {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
@media (min-width: 900px) {
  .nav-toggle { display: none; }
}
.header-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-max-width);
  margin: 0 auto;
  width: 100%;
  padding: 0 2rem 0.6rem;
  gap: 1rem;
}
.main-nav {
  flex: 1;
}
.nav-list {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}
.nav-link {
  display: inline-block;
  padding: 0.35rem 1rem;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  border-radius: var(--radius);
  transition: all var(--transition);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 1rem;
  right: 1rem;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.nav-link:hover { color: var(--text-primary); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] {
  color: var(--accent);
  background: rgba(212,175,55,0.08);
}
.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--accent); }
.header-extra {
  flex-shrink: 0;
}
.header-slogan {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.12em;
  opacity: 0.7;
  padding: 0.2rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  white-space: nowrap;
}
@media (max-width: 899px) {
  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 360px;
    height: 100vh;
    background: var(--surface);
    padding: 5rem 2rem 2rem;
    transition: right var(--transition);
    box-shadow: -4px 0 30px rgba(0,0,0,0.5);
    overflow-y: auto;
    z-index: 9050;
    border-left: 1px solid var(--border);
  }
  .main-nav[data-open] { right: 0; }
  .nav-list { flex-direction: column; gap: 0.5rem; }
  .nav-link { font-size: 1rem; padding: 0.6rem 1rem; display: block; }
  .nav-link::after { display: none; }
  .header-bottom { padding: 0 1rem 0.6rem; }
  .header-extra { display: none; }
}
@media (min-width: 900px) {
  .header-top { padding: 0.5rem 2rem; }
  .site-header { padding: 0; }
  .header-bottom { padding: 0 2rem 0.5rem; }
}

/* ===== Footer ===== */
.site-footer {
  background: var(--primary);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(30,58,95,0.4);
}
@media (min-width: 640px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 960px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1.2fr; gap: 3rem; }
}
.footer-brand { }
.footer-logo { margin-bottom: 1rem; }
.footer-logo .brand-name { font-size: 1.2rem; }
.footer-logo .brand-mark { font-size: 1.4rem; }
.footer-desc { font-size: 0.9rem; line-height: 1.6; color: var(--text-secondary); margin-bottom: 0.8rem; }
.footer-trust {
  font-size: 0.75rem;
  color: rgba(148,163,184,0.6);
  border-left: 2px solid var(--accent);
  padding-left: 0.8rem;
  margin-top: 0.5rem;
}
.footer-heading {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  text-transform: uppercase;
  position: relative;
}
.footer-heading::after {
  content: '';
  display: block;
  width: 30px;
  height: 1px;
  background: var(--accent);
  margin-top: 0.4rem;
}
.footer-link-list { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-link-list a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
}
.footer-link-list a:hover { color: var(--accent); padding-left: 4px; }
.footer-contact-list { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-contact-list li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.contact-label { color: var(--text-primary); opacity: 0.7; }
.footer-contact-list a { color: var(--accent); font-size: 0.85rem; }
.footer-contact-list a:hover { color: #e0c060; }
.footer-bottom {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 1.2rem 0;
  text-align: center;
}
.footer-icp {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
  font-size: 0.78rem;
  color: rgba(148,163,184,0.5);
}
.footer-icp a { color: rgba(148,163,184,0.6); }
.footer-icp a:hover { color: var(--accent); }
.icp-sep { opacity: 0.3; }
@media (max-width: 480px) {
  .site-footer { padding: 2rem 1rem 0; }
  .footer-icp { flex-direction: column; align-items: center; gap: 0.3rem; }
  .icp-sep { display: none; }
}

/* ===== Scroll Progress ===== */
.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: transparent;
  z-index: 10;
}
.scroll-progress::after {
  content: '';
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--secondary));
  transition: width 0.1s linear;
}
.scroll-progress[data-progress]::after { width: attr(data-progress '%'); }

/* ===== Shared Components ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.6rem;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  line-height: 1.4;
}
.btn:hover { background: var(--surface); color: var(--text-primary); border-color: var(--accent); }
.btn-accent {
  background: var(--accent);
  color: var(--primary);
  border-color: var(--accent);
  font-weight: 700;
  box-shadow: 0 0 20px rgba(212,175,55,0.15);
}
.btn-accent:hover { background: #e0c060; color: var(--primary); box-shadow: 0 0 30px rgba(212,175,55,0.25); }

/* ===== Section Number (编号章节) ===== */
.section-number {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}
.section-number .num {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 900;
  color: var(--accent);
  opacity: 0.25;
  line-height: 1;
  letter-spacing: -0.04em;
}
.section-number .label {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}
@media (min-width: 640px) {
  .section-number .num { font-size: 5rem; }
}

/* ===== Data Card ===== */
.data-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.data-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  opacity: 0.3;
  transition: opacity var(--transition);
}
.data-card:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,0.4); }
.data-card:hover::before { opacity: 1; }
.data-card .card-value {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}
.data-card .card-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
}

/* ===== Screen Split (左右分屏) ===== */
.screen-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
@media (min-width: 768px) {
  .screen-split { grid-template-columns: 1fr 1fr; gap: 3rem; padding: 0 2rem; }
}
.screen-split .split-left { }
.screen-split .split-right { }

/* ===== Glow Line ===== */
.glow-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.2;
  margin: 2rem 0;
}

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.filter-btn {
  padding: 0.4rem 1.2rem;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.filter-btn:hover { border-color: var(--accent); color: var(--text-primary); }
.filter-btn[data-active] { background: var(--accent); color: var(--primary); border-color: var(--accent); font-weight: 700; }

/* ===== Responsive Container ===== */
.content-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
@media (min-width: 768px) {
  .content-container { padding: 0 2rem; }
}

/* ===== Utility ===== */
.text-accent { color: var(--accent); }
.text-secondary { color: var(--text-secondary); }
.bg-surface { background: var(--surface); }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.p-1 { padding: 1rem; }
.p-2 { padding: 2rem; }
.text-center { text-align: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  html { scroll-behavior: auto; }
}

/* ===== Responsive Typography ===== */
@media (max-width: 640px) {
  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.6rem; }
  h3 { font-size: 1.3rem; }
  h4 { font-size: 1rem; }
  body { font-size: 0.95rem; }
}
@media (min-width: 641px) and (max-width: 1024px) {
  h1 { font-size: 2.8rem; }
  h2 { font-size: 2rem; }
}

/* ===== Accessibility ===== */
@media (prefers-contrast: high) {
  .nav-link { color: var(--text-primary); }
  .footer-link-list a { color: var(--text-primary); }
  .data-card { border-width: 2px; }
}