/* =====================================================
   万博中国官方主页 · 共享样式 /assets/site.css
   全球联赛切换枢纽 —— 展览画册式数据界面
   ===================================================== */

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

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

body {
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--color-accent);
  color: #071018;
}

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

a {
  color: var(--color-text);
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  border-radius: 0;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-headline);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h2 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
}

h3 {
  font-size: clamp(1.15rem, 1.8vw, 1.4rem);
}

/* ---------- Design Tokens ---------- */
:root {
  --color-bg: #0a1428;
  --color-accent: #39ff88;
  --color-accent-alt: #ff6b35;
  --color-deep-teal: #0e4c5a;
  --color-burgundy: #6e1423;
  --color-indigo: #3d2c5a;
  --color-text: #f4f7fb;
  --color-text-muted: #8ba0b8;
  --color-line: rgba(244, 247, 251, 0.2);

  --font-headline: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --content-width: 1240px;
  --gutter: clamp(1rem, 3vw, 2rem);
}

/* ---------- Focus & Accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

a:focus-visible,
button:focus-visible {
  outline-color: var(--color-accent);
  border-radius: 0;
}

@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;
  }
}

/* ---------- Container ---------- */
.wrap {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.main-content {
  min-height: 60vh;
  scroll-margin-top: 1rem;
}

/* ---------- Header: Scroll Progress & Skip Link ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--color-accent);
  z-index: 3000;
  pointer-events: none;
  transition: width 0.1s ease-out;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0.75rem;
  z-index: 3100;
  transform: translateY(-100%);
  background: var(--color-accent);
  color: #071018;
  font-weight: 800;
  padding: 0.6rem 1rem;
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--color-accent-alt);
  outline-offset: 2px;
}

/* ---------- Header: Masthead ---------- */
.site-header {
  position: relative;
  background: var(--color-indigo);
  border-bottom: 1px solid var(--color-line);
}

.masthead {
  text-align: center;
  padding: 2.25rem 1.5rem 2rem;
  position: relative;
}

.masthead::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 14%;
  height: 3px;
  background: var(--color-accent);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 100%, 0 100%);
}

.masthead::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 10%;
  height: 3px;
  background: var(--color-accent-alt);
  clip-path: polygon(8px 0, 100% 0, 100% 100%, 0 100%);
}

.masthead-kicker {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.masthead-brand {
  display: block;
  line-height: 1.1;
}

.masthead-title {
  display: block;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(1.75rem, 4vw, 3rem);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.masthead-accent {
  color: var(--color-accent);
}

.masthead-tagline {
  display: block;
  margin-top: 0.45rem;
  font-size: clamp(0.8rem, 2vw, 1rem);
  letter-spacing: 0.4em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* ---------- Header: Nav Rail ---------- */
.nav-rail {
  background: rgba(10, 20, 40, 0.5);
  border-top: 1px solid rgba(244, 247, 251, 0.12);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.85rem 1rem;
  background: rgba(10, 20, 40, 0.85);
  border-bottom: 1px solid var(--color-line);
  color: var(--color-text);
  font-weight: 700;
}

.nav-toggle-label {
  order: 2;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.nav-toggle-icon {
  order: 1;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 20px;
  height: 16px;
}

.nav-toggle-icon i {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

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

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

/* ---------- Navigation: Mobile (Base) ---------- */
.site-nav {
  display: none;
  background: rgba(10, 20, 40, 0.92);
  border-bottom: 1px solid var(--color-line);
}

.site-nav[data-open] {
  display: block;
}

.nav-list {
  display: flex;
  flex-direction: column;
}

.nav-item {
  border-bottom: 1px solid rgba(244, 247, 251, 0.08);
}

.nav-item:last-child {
  border-bottom: 0;
}

.nav-link {
  display: block;
  padding: 0.85rem 1.25rem;
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover {
  background: rgba(244, 247, 251, 0.04);
  color: var(--color-accent);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  box-shadow: inset 3px 0 0 var(--color-accent);
}

/* ---------- Navigation: Desktop ---------- */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: block;
    background: transparent;
    border-bottom: 0;
  }

  .nav-list {
    flex-direction: row;
    justify-content: center;
    gap: 0.25rem;
  }

  .nav-item {
    border-bottom: 0;
  }

  .nav-link {
    padding: 0.9rem 1.25rem;
    border-bottom: 2px solid transparent;
    box-shadow: none;
  }

  .nav-link:hover {
    background: transparent;
    color: var(--color-accent);
  }

  .nav-link[aria-current="page"] {
    box-shadow: none;
    border-bottom-color: var(--color-accent);
  }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-deep-teal);
  border-top: 1px solid var(--color-line);
}

.footer-top-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem 2.5rem;
  padding-block: 3rem 2.5rem;
}

.footer-brand-block {
  max-width: 100%;
}

.footer-brand-kicker {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.footer-brand-title {
  margin-top: 0.25rem;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(1.4rem, 2.4vw, 1.8rem);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.footer-brand-tagline {
  margin-top: 0.3rem;
  font-size: 0.9rem;
  letter-spacing: 0.28em;
  color: var(--color-accent);
}

.footer-brand-note {
  margin-top: 1rem;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 32em;
}

.footer-col-title {
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  text-transform: uppercase;
  border-bottom: 1px solid rgba(244, 247, 251, 0.15);
  padding-bottom: 0.6rem;
  margin-bottom: 1rem;
}

.footer-col-list li {
  position: relative;
  padding-left: 0.9rem;
  margin-bottom: 0.55rem;
}

.footer-col-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.35rem;
  height: 1px;
  background: var(--color-accent);
}

.footer-col-list a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-col-list a:hover {
  color: var(--color-accent);
  padding-left: 0.25rem;
}

.footer-contact-list li {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  margin-bottom: 0.35rem;
}

.footer-contact-list .contact-label {
  display: inline-block;
  color: var(--color-text);
  font-weight: 700;
  min-width: 2.5em;
  margin-right: 0.25rem;
}

.footer-contact-list .contact-note {
  font-size: 0.8rem;
  opacity: 0.9;
  padding-left: 0;
}

.footer-bottom {
  background: var(--color-bg);
  border-top: 1px solid var(--color-line);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-block: 1.25rem;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-icp {
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-trust {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  flex-basis: 100%;
}

/* ---------- Footer: Responsive ---------- */
@media (min-width: 640px) {
  .footer-top-inner {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-brand-block {
    grid-column: span 2;
  }
}

@media (min-width: 1024px) {
  .footer-top-inner {
    grid-template-columns: 1.3fr 1fr 1fr 1.5fr;
  }

  .footer-brand-block {
    grid-column: auto;
  }
}

/* ---------- Back to Top ---------- */
.back-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-indigo);
  color: var(--color-accent);
  border: 1px solid var(--color-line);
  font-size: 1.2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 1200;
}

.back-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.back-top:hover {
  border-color: var(--color-accent);
}

/* ---------- Grid ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.75rem);
}

.g4 {
  grid-column: span 4;
}

.g5 {
  grid-column: span 5;
}

.g6 {
  grid-column: span 6;
}

.g7 {
  grid-column: span 7;
}

.g8 {
  grid-column: span 8;
}

@media (max-width: 767px) {
  .grid-12 {
    grid-template-columns: 1fr;
  }

  .g4,
  .g5,
  .g6,
  .g7,
  .g8 {
    grid-column: span 1;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .g4,
  .g5,
  .g6 {
    grid-column: span 6;
  }

  .g7,
  .g8 {
    grid-column: span 12;
  }
}

/* ---------- Section Headings ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-label::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.section-title {
  margin-top: 0;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.section-intro {
  margin-top: 0.75rem;
  color: var(--color-text-muted);
  max-width: 55ch;
  line-height: 1.7;
  font-size: 1rem;
}

/* ---------- Dividers ---------- */
.divider {
  border: 0;
  border-top: 1px solid var(--color-line);
  margin-block: 2rem;
}

.divider-dashed {
  border-top-style: dashed;
}

/* ---------- Theme Blocks ---------- */
.theme-indigo {
  background: var(--color-indigo);
}

.theme-teal {
  background: var(--color-deep-teal);
}

.theme-burgundy {
  background: var(--color-burgundy);
}

/* ---------- Data Cards ---------- */
.data-card {
  position: relative;
  border: 1px solid var(--color-line);
  background: linear-gradient(135deg, rgba(244, 247, 251, 0.04) 0%, rgba(10, 20, 40, 0.24) 100%);
  padding: 1.5rem 1.5rem 1.75rem;
  overflow: hidden;
}

.data-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent) 40%, transparent 100%);
}

.data-value {
  font-family: var(--font-data);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.data-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* ---------- Stat Grid ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.stat-item {
  border: 1px solid var(--color-line);
  background: rgba(10, 20, 40, 0.35);
  padding: 1.25rem 1rem;
}

.stat-value {
  font-family: var(--font-data);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.05;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.stat-key {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ---------- Panels ---------- */
.panel {
  border: 1px solid var(--color-line);
  background: rgba(244, 247, 251, 0.03);
  padding: 1.5rem;
}

.panel-dark {
  background: rgba(10, 20, 40, 0.5);
  border-color: rgba(244, 247, 251, 0.12);
}

.panel-burgundy {
  background: var(--color-burgundy);
  border-color: rgba(244, 247, 251, 0.12);
}

/* ---------- Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  border: 1px solid var(--color-line);
  color: var(--color-text-muted);
  text-transform: uppercase;
  white-space: nowrap;
}

.tag-green {
  color: var(--color-accent);
  border-color: rgba(57, 255, 136, 0.5);
}

.tag-orange {
  color: var(--color-accent-alt);
  border-color: rgba(255, 107, 53, 0.5);
}

.tag-filled {
  background: var(--color-accent);
  color: #071018;
  border-color: var(--color-accent);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-radius: 0;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn-solid {
  background: var(--color-accent);
  color: #071018;
  border-color: var(--color-accent);
}

.btn-solid:hover {
  background: var(--color-accent-alt);
  border-color: var(--color-accent-alt);
  color: #071018;
}

.btn-orange {
  background: var(--color-accent-alt);
  color: #071018;
  border-color: var(--color-accent-alt);
}

.btn-orange:hover {
  background: transparent;
  color: var(--color-accent-alt);
}

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

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---------- Media Frame ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-indigo) 0%, var(--color-deep-teal) 100%);
}

.media-frame::before {
  content: "";
  display: block;
  padding-top: 62.5%;
}

.media-frame > img,
.media-frame > picture img,
.media-frame > video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: attr(data-caption);
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.4rem 0.75rem;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  background: rgba(10, 20, 40, 0.8);
  color: var(--color-text-muted);
  pointer-events: none;
}

.media-frame--wide::before {
  padding-top: 45%;
}

.media-frame--portrait::before {
  padding-top: 125%;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

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

.breadcrumb-sep {
  display: inline-block;
  color: var(--color-line);
  transform: rotate(-15deg);
}

.breadcrumb-sep::before {
  content: "/";
  margin-inline: 0.25rem;
}

.breadcrumb .current {
  color: var(--color-accent);
}

/* ---------- Notice Box ---------- */
.notice-box {
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-accent-alt);
  background: rgba(255, 107, 53, 0.07);
  padding: 1.25rem 1.5rem;
  color: var(--color-text);
  font-size: 0.9rem;
  line-height: 1.7;
}

.notice-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-alt);
  margin-bottom: 0.5rem;
}

.notice-title::before {
  content: "!";
  font-weight: 900;
  color: var(--color-accent-alt);
}

/* ---------- Utility ---------- */
.text-data {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

.text-muted {
  color: var(--color-text-muted);
}

.text-accent {
  color: var(--color-accent);
}

.text-accent-alt {
  color: var(--color-accent-alt);
}

.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: 1rem;
}

.mt-2 {
  margin-top: 2rem;
}

.mt-3 {
  margin-top: 3rem;
}

.mb-1 {
  margin-bottom: 1rem;
}

.mb-2 {
  margin-bottom: 2rem;
}