/* =============================================================
   LEYU体育 乐竞体育 | /assets/site.css
   共享视觉体系：展览画册式运动数据风格
   ============================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --c-primary: #0A1F44;
  --c-primary-hover: #123B6D;
  --c-accent: #FF6B35;
  --c-accent-soft: #FFA07A;
  --c-white: #FFFFFF;
  --c-gray: #F5F7FA;
  --c-border: #091A36;
  --c-text: #101828;
  --c-text-2: #475467;
  --c-success: #12B76A;

  --font-display: "Montserrat", "Arial Black", "Impact", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;

  --container-w: 1200px;
  --header-h: 84px;
  --radius: 2px;
  --shadow-sm: 0 4px 12px rgba(10, 31, 68, 0.08);
  --shadow-md: 0 10px 28px rgba(10, 31, 68, 0.14);
  --shadow-lg: 0 20px 48px rgba(9, 26, 54, 0.25);

  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 16px;
  --sp-4: 24px;
  --sp-5: 40px;
  --sp-6: 64px;
  --sp-7: 96px;

  --fs-display: 48px;
  --fs-title: 30px;
  --fs-subtitle: 20px;
  --fs-body: 16px;
  --fs-small: 14px;
  --fs-micro: 12px;

  --z-skip: 1000;
  --z-progress: 999;
  --z-header: 100;
  --z-nav: 90;
}

/* ---------- 2. Reset 与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-white);
}

main {
  display: block;
}

#main-content {
  flex: 1 0 auto;
  outline: none;
  min-height: 60vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.25;
  color: var(--c-text);
  margin-bottom: 0.5em;
}

p {
  margin-bottom: 1em;
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

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

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

input, textarea, select {
  font: inherit;
  width: 100%;
}

::selection {
  background: var(--c-accent);
  color: var(--c-white);
}

/* ---------- 3. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--sp-4);
}

.section {
  padding-block: var(--sp-6);
}

/* ---------- 4. 焦点与辅助 ---------- */
:focus-visible {
  outline: 2px dashed var(--c-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: 0;
  left: var(--sp-3);
  z-index: var(--z-skip);
  padding: var(--sp-2) var(--sp-3);
  background: var(--c-accent);
  color: var(--c-white);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: 0 0 var(--radius) var(--radius);
  transform: translateY(-160%);
  transition: transform 0.25s ease;
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--c-white);
  outline: 3px solid var(--c-white);
  outline-offset: -3px;
}

/* ---------- 5. 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-progress);
  width: 0;
  height: 4px;
  background: var(--c-white);
  pointer-events: none;
  box-shadow: 0 0 8px rgba(255, 107, 53, 0.5);
}

/* ---------- 6. 页头框架 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  color: var(--c-white);
  background: var(--c-primary);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--c-accent);
  z-index: 1;
}

.site-header::after {
  content: "V4";
  position: absolute;
  right: var(--sp-5);
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-size: 72px;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.02em;
  line-height: 1;
  color: rgba(255, 255, 255, 0.035);
  pointer-events: none;
  z-index: 0;
}

.header-main {
  position: relative;
  z-index: 1;
}

.header-container {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: var(--header-h);
}

/* ---------- 7. 品牌 ---------- */
.header-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  color: var(--c-white);
  flex-shrink: 0;
}

.header-brand:hover {
  color: var(--c-white);
  opacity: 0.85;
}

.brand-en {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 900;
  font-style: italic;
  letter-spacing: 0.02em;
  line-height: 1;
}

.brand-zh {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.28em;
  line-height: 1;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1;
  padding: 4px 6px;
  background: var(--c-accent);
  color: var(--c-white);
  border-radius: var(--radius);
}

/* ---------- 8. 页头标语与操作区 ---------- */
.header-slogan {
  display: inline-flex;
  align-items: center;
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  border-left: 2px solid var(--c-accent);
  padding-left: var(--sp-3);
  margin-left: var(--sp-1);
  white-space: nowrap;
  line-height: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-left: auto;
  flex-shrink: 0;
}

.header-entry {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius);
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--fs-small);
  font-weight: 600;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}

.header-entry:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-white);
}

.entry-arrow {
  font-size: 14px;
  line-height: 1;
  transition: transform 0.2s ease;
}

.header-entry:hover .entry-arrow {
  transform: translateX(3px);
}

/* ---------- 9. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius);
  color: var(--c-white);
  transition: border-color 0.2s;
}

.nav-toggle:hover {
  border-color: rgba(255, 255, 255, 0.55);
}

.nav-toggle-label {
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.nav-toggle-bars {
  position: relative;
  width: 20px;
  height: 14px;
  flex-shrink: 0;
}

.nav-toggle-bars .bar {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--c-white);
  transition: top 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
}

.bar-top {
  top: 0;
}

.bar-mid {
  top: 6px;
}

.bar-bottom {
  top: 12px;
}

.nav-toggle[aria-expanded="true"] .bar-top {
  top: 6px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .bar-mid {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .bar-bottom {
  top: 6px;
  transform: rotate(-45deg);
}

/* ---------- 10. 主导航 ---------- */
.site-nav {
  position: relative;
  z-index: 2;
  background: var(--c-primary);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 2px solid var(--c-border);
}

.nav-container {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  margin: 0;
  counter-reset: navIdx;
}

.nav-item {
  counter-increment: navIdx;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 16px var(--sp-3);
  color: rgba(255, 255, 255, 0.82);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-link::before {
  content: counter(navIdx, decimal-leading-zero);
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 800;
  font-style: italic;
  line-height: 1;
  color: var(--c-accent);
  opacity: 0.85;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: var(--sp-4);
  right: var(--sp-4);
  bottom: 0;
  height: 3px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-link:hover {
  color: var(--c-white);
  background: var(--c-primary-hover);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--c-white);
  font-weight: 800;
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ---------- 11. 页脚框架 ---------- */
.site-footer {
  margin-top: auto;
  color: rgba(255, 255, 255, 0.68);
  background: var(--c-primary);
  border-top: 4px solid var(--c-accent);
}

.footer-main {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1fr;
  gap: var(--sp-6);
  padding-block: var(--sp-6);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  color: var(--c-white);
}

.footer-brand:hover {
  color: var(--c-white);
  opacity: 0.85;
}

.footer-brand-en {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 900;
  font-style: italic;
  letter-spacing: 0.02em;
  line-height: 1;
}

.footer-brand-zh {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.28em;
  line-height: 1;
}

.footer-slogan {
  margin-top: var(--sp-3);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-accent);
}

.footer-trust {
  margin-top: var(--sp-3);
  max-width: 380px;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.5);
}

.footer-heading {
  display: inline-block;
  margin-bottom: var(--sp-3);
  padding-bottom: var(--sp-2);
  border-bottom: 2px solid var(--c-accent);
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-white);
}

.footer-list li {
  margin-bottom: var(--sp-2);
}

.footer-list a {
  position: relative;
  display: inline-block;
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--fs-body);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-list a::before {
  content: "—";
  color: var(--c-accent);
  margin-right: var(--sp-2);
  opacity: 0.7;
}

.footer-list a:hover {
  color: var(--c-accent);
  padding-left: var(--sp-1);
}

.footer-contact-list li {
  display: flex;
  gap: var(--sp-3);
  margin-bottom: var(--sp-2);
  font-size: var(--fs-small);
  color: rgba(255, 255, 255, 0.75);
}

.contact-label {
  flex-shrink: 0;
  width: 44px;
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.footer-icp {
  margin-top: var(--sp-4);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.4);
}

.footer-bottom {
  background: rgba(9, 26, 54, 0.55);
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding-block: var(--sp-3);
}

.footer-copy {
  margin: 0;
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.45);
}

.footer-note {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: var(--fs-micro);
  font-weight: 800;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.4);
  border-left: 2px solid var(--c-accent);
  padding-left: var(--sp-2);
}

/* ---------- 12. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 13px 30px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  color: var(--c-white);
  background: var(--c-accent);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: #E65A26;
  color: var(--c-white);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  color: var(--c-primary);
  border-color: var(--c-primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--c-primary);
  color: var(--c-white);
}

.btn-ghost {
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.4);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: rgba(255, 255, 255, 0.04);
}

/* ---------- 13. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1);
  margin-bottom: var(--sp-4);
  font-size: var(--fs-small);
  color: var(--c-text-2);
}

.breadcrumbs a {
  font-weight: 600;
  color: var(--c-primary);
}

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

.breadcrumbs li + li::before {
  content: "/";
  margin: 0 var(--sp-2);
  color: var(--c-accent);
}

.breadcrumbs [aria-current="page"] {
  font-weight: 600;
  color: var(--c-text);
}

/* ---------- 14. 展览标题 ---------- */
.section-title {
  display: flex;
  align-items: flex-end;
  gap: var(--sp-3);
  font-family: var(--font-display);
  font-size: var(--fs-title);
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.15;
  color: var(--c-text);
  margin-bottom: var(--sp-4);
}

.section-note {
  writing-mode: vertical-rl;
  font-family: var(--font-body);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  line-height: 1.3;
  color: var(--c-accent);
}

/* ---------- 15. 媒体框占位 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-gray);
  border: 2px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.media-frame::before {
  content: attr(data-label);
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 5px 10px;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.media-frame-16x9 {
  aspect-ratio: 16 / 9;
}

.media-frame-4x3 {
  aspect-ratio: 4 / 3;
}

.media-frame-1x1 {
  aspect-ratio: 1 / 1;
}

/* ---------- 16. 基础栅格 ---------- */
.grid {
  display: grid;
  gap: var(--sp-5);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* ---------- 17. 平板与移动端响应 ---------- */
@media (max-width: 1024px) {
  :root {
    --sp-7: 72px;
  }

  .nav-link {
    padding: 14px 14px;
    font-size: 13px;
  }

  .header-slogan {
    letter-spacing: 0.18em;
  }

  .footer-grid {
    gap: var(--sp-5);
  }
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-5);
  }

  .footer-brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 767px) {
  .header-container {
    min-height: 64px;
  }

  .header-entry {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: var(--c-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: var(--shadow-lg);
    transition: max-height 0.35s ease, visibility 0.35s ease;
  }

  .site-nav[data-open] {
    max-height: 560px;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding-block: var(--sp-2);
  }

  .nav-link {
    width: 100%;
    padding: 15px var(--sp-4);
    font-size: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .nav-link::before {
    font-size: 11px;
  }
}

@media (max-width: 640px) {
  .header-container {
    gap: var(--sp-2);
  }

  .header-slogan {
    display: none;
  }

  .nav-toggle {
    padding: var(--sp-2);
  }

  .nav-toggle-label {
    display: none;
  }

  .brand-en {
    font-size: 22px;
  }

  .brand-zh {
    font-size: 16px;
    letter-spacing: 0.2em;
  }

  .brand-mark {
    font-size: 10px;
    padding: 3px 5px;
  }

  .site-header::after {
    font-size: 44px;
    right: var(--sp-3);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-4);
    padding-block: var(--sp-5);
  }

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

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
  }

  .grid-cols-2,
  .grid-cols-3 {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 24px;
  }
}

/* ---------- 18. 减少动态效果 ---------- */
@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;
  }

  .site-nav,
  .skip-link,
  .nav-toggle-bars .bar,
  .header-entry .entry-arrow {
    transition: none !important;
  }
}