/* ==========================================================================
   必赢赛事 · 全站共享样式
   /assets/site.css
   Creative DNA : 赛事现场档案馆 / 纵向叙事长卷 / 左右分置导航
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-deep-blue);
  background-image:
    radial-gradient(ellipse 70% 45% at 120% 0%, rgba(0, 180, 216, 0.12), transparent),
    radial-gradient(ellipse 55% 40% at -10% 25%, rgba(29, 78, 216, 0.16), transparent);
  -webkit-font-smoothing: antialiased;
}

main { display: block; }

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; border: none; background: none; color: inherit; cursor: pointer; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.25;
  color: #fff;
  letter-spacing: 0.02em;
}

p { margin-bottom: 1rem; }
strong { color: var(--color-light-gold); font-weight: 700; }
::selection { background: var(--color-gold); color: var(--color-deep-blue); }

:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 3px; }

/* ---------- 2. CSS Variables ---------- */
:root {
  --color-deep-blue: #0A1E3F;
  --color-royal-blue: #1D4ED8;
  --color-electric-blue: #00B4D8;
  --color-gold: #F5B301;
  --color-light-gold: #FDE68A;
  --color-victory-red: #E11D48;
  --color-glass-white: rgba(255, 255, 255, 0.1);
  --color-ink: #0F172A;
  --color-text: rgba(255, 255, 255, 0.92);
  --color-text-secondary: rgba(255, 255, 255, 0.68);
  --color-text-muted: rgba(255, 255, 255, 0.42);

  --font-heading: "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", SimSun, serif;
  --font-mono: "SFMono-Regular", "Cascadia Mono", "JetBrains Mono", Consolas, monospace;

  --header-height: 80px;
  --header-height-mobile: 64px;
  --radius: 10px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 3. Utilities ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  background: var(--color-gold);
  color: var(--color-deep-blue);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.75rem 1.5rem;
  border-radius: 0 0 6px 0;
  transform: translateY(-120%);
  transition: transform 0.2s ease;
}
.skip-link:focus { transform: translateY(0); }

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: clamp(1.25rem, 4vw, 2.5rem);
  padding-right: clamp(1.25rem, 4vw, 2.5rem);
}

#main-content { scroll-margin-top: calc(var(--header-height) + 1rem); }

/* ---------- 4. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 30, 63, 0.82);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background 0.4s ease, box-shadow 0.4s ease;
}
.site-header.is-scrolled {
  background: rgba(10, 30, 63, 0.96);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  transform-origin: left center;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--color-electric-blue), var(--color-gold) 65%, var(--color-light-gold));
  z-index: 10;
}

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2rem);
  min-height: var(--header-height-mobile);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}
.brand-mark {
  font-size: 1.75rem;
  line-height: 1;
  color: var(--color-gold);
  text-shadow: 0 0 18px rgba(245, 179, 1, 0.35);
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  color: #fff;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.56rem;
  letter-spacing: 0.2em;
  color: var(--color-electric-blue);
}

.site-nav { margin-left: auto; }
.nav-list { display: flex; flex-direction: column; gap: 0; }
.nav-item { border-bottom: 1px solid rgba(255, 255, 255, 0.06); }
.nav-link {
  display: block;
  padding: 0.85rem 0.25rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--color-text);
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-gold);
  padding-left: 0.5rem;
}

.header-cta {
  display: none;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
  padding: 0.55rem 1.25rem;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-deep-blue);
  background: linear-gradient(135deg, var(--color-gold), #ffce3e 60%, var(--color-light-gold));
  border-radius: 3px;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}
.header-cta::after { content: "→"; transition: transform 0.25s ease; }
.header-cta:hover {
  box-shadow: 0 0 24px rgba(245, 179, 1, 0.3);
  transform: translateY(-1px);
}
.header-cta:hover::after { transform: translateX(4px); }
.header-cta:focus-visible { outline-color: var(--color-deep-blue); }

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 9px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  flex-shrink: 0;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.nav-toggle:hover {
  border-color: var(--color-gold);
  background: rgba(245, 179, 1, 0.08);
}
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-light-gold);
  border-radius: 1px;
  transition: transform 0.3s var(--ease-standard), opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.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: translateY(-7px) rotate(-45deg); }

/* ---------- 5. Mobile Nav State ---------- */
@media (max-width: 1024px) {
  #main-content { scroll-margin-top: calc(var(--header-height-mobile) + 1rem); }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 30, 63, 0.98);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(245, 179, 1, 0.2);
    border-bottom: 1px solid rgba(245, 179, 1, 0.2);
    margin-left: 0;
    padding: 0.5rem 1.5rem 1rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s linear 0.3s;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s;
  }
}

/* ---------- 6. Desktop Header Overrides ---------- */
@media (min-width: 1025px) {
  .header-shell { min-height: var(--header-height); }

  .nav-toggle { display: none; }

  .site-nav {
    margin-left: auto;
    display: block;
  }
  .nav-list { flex-direction: row; gap: 0.15rem; }
  .nav-item { border-bottom: none; }
  .nav-link {
    position: relative;
    display: inline-block;
    padding: 0.6rem 0.8rem;
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    transition: color 0.25s ease;
  }
  .nav-link::before {
    content: "";
    position: absolute;
    left: 0.8rem;
    right: 0.8rem;
    bottom: 0;
    height: 2px;
    background: var(--color-gold);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.3s var(--ease-out);
  }
  .nav-link:hover {
    color: var(--color-light-gold);
    padding-left: 0.8rem;
  }
  .nav-link:hover::before,
  .nav-link[aria-current="page"]::before { transform: scaleX(1); }
  .nav-link[aria-current="page"] { color: var(--color-gold); }

  .header-cta { display: inline-flex; }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .header-cta { display: inline-flex; margin-left: 0.75rem; }
}

/* ---------- 7. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: auto;
  background-color: var(--color-ink);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 32px 32px;
  border-top: 3px solid var(--color-gold);
}
.site-footer::after {
  content: "必赢";
  position: absolute;
  bottom: 0.5rem;
  right: 1.5rem;
  font-family: var(--font-heading);
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1;
  color: rgba(255, 255, 255, 0.03);
  pointer-events: none;
}

.footer-shell {
  max-width: 1440px;
  margin: 0 auto;
  padding: 3rem clamp(1.25rem, 4vw, 2.5rem) 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.footer-brand { display: flex; align-items: center; gap: 0.5rem; }
.footer-brand .brand-mark { font-size: 1.5rem; }
.footer-brand-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: #fff;
  letter-spacing: 0.05em;
}
.footer-trust {
  margin-top: 0.75rem;
  margin-bottom: 1rem;
  max-width: 34ch;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}
.footer-meta {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border: 1px solid rgba(0, 180, 216, 0.4);
  color: var(--color-electric-blue);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.footer-heading {
  margin-bottom: 0.85rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.footer-nav-list { display: flex; flex-direction: column; gap: 0.45rem; }
.footer-nav-list a {
  display: inline-block;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  transition: color 0.2s ease, transform 0.2s ease;
}
.footer-nav-list a:hover {
  color: var(--color-light-gold);
  transform: translateX(3px);
}

.footer-contact { padding-bottom: 0.5rem; }
.footer-contact-item {
  margin-bottom: 0.35rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}
.footer-contact-note {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.25rem 0;
}
.footer-bottom-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 2.5rem);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1.5rem;
  position: relative;
  z-index: 1;
}
.footer-copyright {
  margin: 0;
  margin-right: auto;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-light-gold);
}
.footer-icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-muted);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}
.footer-legal a {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}
.footer-legal a:hover { color: var(--color-gold); }
.footer-footnote {
  flex-basis: 100%;
  margin: 0.25rem 0 0;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

@media (min-width: 641px) and (max-width: 1024px) {
  .footer-shell {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
}

@media (min-width: 1025px) {
  .footer-shell {
    grid-template-columns: repeat(12, 1fr);
    gap: 2rem;
  }
  .footer-brand-block { grid-column: span 4; }
  .footer-col:nth-child(2) { grid-column: span 2; }
  .footer-col:nth-child(3) { grid-column: span 2; }
  .footer-contact { grid-column: span 4; }
}

/* ---------- 8. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.25s ease;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-gold), #ffce3e 70%, var(--color-light-gold));
  color: var(--color-deep-blue);
}
.btn-primary:hover {
  box-shadow: 0 4px 24px rgba(245, 179, 1, 0.3);
  transform: translateY(-1px);
}
.btn-outline {
  border-color: rgba(245, 179, 1, 0.5);
  color: var(--color-gold);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--color-gold);
  background: rgba(245, 179, 1, 0.08);
}

/* ---------- 9. Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
  padding: 1.25rem 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}
.breadcrumb a { color: var(--color-electric-blue); transition: color 0.2s ease; }
.breadcrumb a:hover { color: var(--color-gold); }
.breadcrumb-sep { color: var(--color-text-muted); }
.breadcrumb [aria-current="page"] { color: var(--color-light-gold); }

/* ---------- 10. Grid ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 1.75rem; }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 1.75rem; }
.grid-4 { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }

@media (min-width: 641px) and (max-width: 1024px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1025px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); gap: 2rem; }
  .grid-4 { grid-template-columns: repeat(4, 1fr); gap: 1.75rem; }
}

/* ---------- 11. Section ---------- */
.section { padding: clamp(3rem, 6vw, 5rem) 0; }
.section-heading {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
}
.section-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  white-space: nowrap;
}
.section-heading h1,
.section-heading h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.5rem);
  letter-spacing: 0.03em;
}

/* ---------- 12. Components ---------- */
.exhibit-card {
  position: relative;
  background: var(--color-glass-white);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem 1.5rem;
  transition: transform 0.35s var(--ease-out), border-color 0.3s ease, background 0.3s ease;
}
.exhibit-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-gold), rgba(245, 179, 1, 0.2));
  border-radius: 3px 0 0 3px;
}
.exhibit-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 179, 1, 0.3);
  background: rgba(255, 255, 255, 0.14);
}

.exhibit-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.7rem;
  border: 1px solid rgba(245, 179, 1, 0.35);
  background: rgba(245, 179, 1, 0.08);
  color: var(--color-light-gold);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  border-radius: 2px;
}
.exhibit-tag::before {
  content: "◆";
  font-size: 0.45rem;
  color: var(--color-gold);
}

.specimen-card {
  position: relative;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  padding: 1.5rem 1.5rem 1.75rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.specimen-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 0 18px 18px 0;
  border-style: solid;
  border-color: transparent var(--color-gold) transparent transparent;
  border-radius: 0 4px 0 0;
}
.specimen-card:hover {
  border-color: rgba(245, 179, 1, 0.35);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.data-stat { text-align: center; padding: 1rem 0.5rem; }
.stat-value {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-gold);
  letter-spacing: -0.02em;
  text-shadow: 0 0 20px rgba(245, 179, 1, 0.15);
}
.stat-label {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-text-secondary);
}

.image-frame {
  position: relative;
  overflow: hidden;
  min-height: 200px;
  border-radius: var(--radius);
  background-color: var(--color-royal-blue);
  background-image:
    radial-gradient(circle at 30% 35%, rgba(0, 180, 216, 0.25), transparent 55%),
    radial-gradient(circle at 70% 65%, rgba(245, 179, 1, 0.12), transparent 45%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;
}
.image-frame::before {
  content: "FIELD · VIEW";
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: rgba(255, 255, 255, 0.4);
}
.image-frame > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.image-frame--square { aspect-ratio: 1; }
.image-frame--portrait { aspect-ratio: 3 / 4; min-height: 320px; }

.vertical-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  line-height: 2;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* ---------- 13. Scroll Reveal Protocol ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s var(--ease-out);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal-delay="1"] { transition-delay: 0.1s; }
[data-reveal-delay="2"] { transition-delay: 0.2s; }
[data-reveal-delay="3"] { transition-delay: 0.3s; }
[data-reveal-delay="4"] { transition-delay: 0.4s; }
[data-reveal-delay="5"] { transition-delay: 0.5s; }

/* ---------- 14. Reduced Motion ---------- */
@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],
  [data-reveal-delay="1"],
  [data-reveal-delay="2"],
  [data-reveal-delay="3"],
  [data-reveal-delay="4"],
  [data-reveal-delay="5"] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}