/* ==========================================================================
   优德赛场 — 全站共享 Site Kit / assets/site.css
   顺序：Reset → Tokens → 中文排版 → 基础版式 → 页头 → 页脚 → 通用组件 → 响应式
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body { margin: 0; }

h1, h2, h3, h4, h5, h6, p, ul, ol, dl, dd, figure, blockquote, pre { margin: 0; }

ul, ol { padding: 0; list-style: none; }

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

a { color: inherit; text-decoration: none; }

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

table { border-collapse: collapse; }

/* 2. Tokens
   ========================================================================== */
:root {
  --ink: #0B1F17;
  --ink-deep: #111512;
  --paper: #F4EEDC;
  --lime: #B6FF3B;
  --amber: #F2A63B;
  --moss: #234A3A;
  --fog: #A8B5AC;
  --silver: #D8E0D5;
  --cyan: #3ED6C4;
  --clay: #D96C4F;

  --line: rgba(216, 224, 213, 0.15);
  --line-strong: rgba(216, 224, 213, 0.32);
  --line-lime: rgba(182, 255, 59, 0.42);

  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", ui-monospace, "Courier New", monospace;

  --shell-max: 1360px;
  --gutter: clamp(18px, 4vw, 48px);
  --header-offset: 78px;

  --radius-s: 4px;
  --radius-m: 8px;
}

/* 3. 中文排版基线
   ========================================================================== */
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--paper);
}

h1 { font-size: clamp(2.6rem, 6.6vw, 6.4rem); line-height: 1.02; }
h2 { font-size: clamp(1.9rem, 3.6vw, 3.1rem); line-height: 1.16; }
h3 { font-size: clamp(1.22rem, 2vw, 1.68rem); line-height: 1.3; font-weight: 800; }
h4 { font-size: 1.05rem; line-height: 1.4; font-weight: 800; }

p { line-height: 1.75; }

strong, b { font-weight: 800; }

::selection {
  background: var(--lime);
  color: var(--ink-deep);
}

:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content { scroll-margin-top: calc(var(--header-offset) + 14px); }

/* 4. 基础版式与通用组件
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 96px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(24px, 3vw, 44px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  display: block;
  width: 26px;
  height: 1px;
  background: var(--lime);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  line-height: 1.2;
  white-space: nowrap;
  transition: transform 0.18s ease, background-color 0.18s ease,
              color 0.18s ease, border-color 0.18s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--lime {
  background: var(--lime);
  color: var(--ink-deep);
}
.btn--lime:hover { background: #c8ff6b; }

.btn--amber {
  background: var(--amber);
  color: var(--ink-deep);
}
.btn--amber:hover { background: #ffb954; }

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--paper);
}
.btn--ghost:hover {
  border-color: var(--line-lime);
  color: var(--lime);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--fog);
}

.breadcrumb a { transition: color 0.18s ease; }
.breadcrumb a:hover { color: var(--lime); }

.breadcrumb__sep { color: var(--moss); }

/* 图片容器（共享外壳不放图，页面阶段使用） */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background:
    linear-gradient(155deg, #16362a 0%, #0b1f17 58%, #111512 100%);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    115deg,
    rgba(182, 255, 59, 0.06) 0 1px,
    transparent 1px 18px
  );
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--band { aspect-ratio: 3 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--paper);
  background: linear-gradient(0deg, rgba(11, 31, 23, 0.9), transparent);
}

/* 滚动显现协议 */
@media (prefers-reduced-motion: no-preference) {
  .js-motion [data-reveal] {
    opacity: 0;
    transform: translateY(18px);
    transition:
      opacity 0.62s ease var(--reveal-delay, 0ms),
      transform 0.62s cubic-bezier(0.22, 0.68, 0.28, 1) var(--reveal-delay, 0ms);
  }
  .js-motion [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* 5. 跳转链接
   ========================================================================== */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 10px 18px;
  border-radius: var(--radius-s);
  background: var(--lime);
  color: var(--ink-deep);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  transform: translateY(-180%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* 6. 页头：左右分置导航
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(11, 31, 23, 0.95);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    112deg,
    rgba(182, 255, 59, 0.055) 0 1px,
    transparent 1px 30px
  );
  opacity: 0.75;
}

.header-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  max-width: var(--shell-max);
  min-height: 78px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--paper);
}

.brand__mark {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: 2px;
  background: linear-gradient(142deg, var(--lime) 0 46%, var(--moss) 46% 100%);
  clip-path: polygon(0 0, 100% 0, 100% 74%, 0 100%);
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.06em;
}

.brand__sub {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--fog);
}

.brand--footer { margin-bottom: 4px; }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.nav-toggle:hover { border-color: var(--line-lime); color: var(--lime); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bar {
  display: block;
  height: 1.5px;
  background: var(--lime);
  transition: transform 0.24s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(2.75px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  transform: translateY(-2.75px) rotate(-45deg);
}

/* 导航（桌面） */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-width: 0;
}

.nav-eyebrow {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: var(--fog);
  text-transform: uppercase;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.7vw, 24px);
}

.site-nav__item { position: relative; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 2px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--silver);
  transition: color 0.18s ease;
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--fog);
  transition: color 0.18s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.26s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.site-nav__link:hover { color: var(--paper); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link:hover .site-nav__num { color: var(--lime); }

.site-nav__link[aria-current="page"] { color: var(--lime); }
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--amber); }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--amber);
}

.site-nav__foot {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: clamp(4px, 1.2vw, 16px);
  padding-left: clamp(8px, 1.4vw, 20px);
  border-left: 1px solid var(--line);
}

.site-nav__utility { display: none; }

.site-nav__util-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--fog);
  transition: color 0.18s ease;
}

.site-nav__util-link:hover { color: var(--lime); }

/* 滚动进度轨 */
.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), var(--cyan));
  transform: scaleX(var(--scroll-p, 0));
  transform-origin: 0 50%;
  transition: transform 0.12s linear;
  pointer-events: none;
}

/* 7. 页脚：资料台
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  background: var(--ink-deep);
  color: var(--paper);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--lime) 0 20%,
    var(--cyan) 20% 30%,
    var(--moss) 30% 78%,
    var(--amber) 78% 100%
  );
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(0, 1.55fr);
  gap: clamp(32px, 5vw, 72px);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(46px, 6vw, 84px) var(--gutter) clamp(30px, 4vw, 48px);
}

.footer-brand { min-width: 0; }

.footer-lead {
  margin-top: 18px;
  max-width: 34ch;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--fog);
}

.footer-contact {
  display: grid;
  gap: 8px;
  margin-top: 24px;
}

.footer-contact__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}

.footer-contact__k {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--fog);
}

.footer-contact__v {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.footer-note {
  margin-top: 20px;
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--fog);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  min-width: 0;
}

.footer-col { min-width: 0; }

.footer-col__head {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--lime);
  text-transform: uppercase;
}

.footer-links { display: grid; gap: 10px; }

.footer-link {
  display: inline-block;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--fog);
  transition: color 0.18s ease, transform 0.18s ease;
}

.footer-link:hover {
  color: var(--lime);
  transform: translateX(3px);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 20px var(--gutter) 30px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--fog);
}

.footer-copy { line-height: 1.6; }

.footer-legal { line-height: 1.6; }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-left: auto;
}

.footer-legal-links .footer-link { font-size: 0.72rem; }

/* 8. 响应式
   ========================================================================== */
@media (max-width: 1120px) {
  .site-nav__num { display: none; }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .nav-eyebrow { display: block; padding-bottom: 16px; }

  .site-nav {
    position: fixed;
    top: var(--header-offset);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 110;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 26px var(--gutter) 48px;
    background: var(--ink-deep);
    border-top: 1px solid var(--line);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.22s ease, transform 0.26s ease, visibility 0.22s linear;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item { border-bottom: 1px solid var(--line); }

  .site-nav__link {
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    font-size: 1.1rem;
    color: var(--paper);
  }

  .site-nav__link::after { display: none; }

  .site-nav__num {
    display: inline-block;
    order: 2;
    font-size: 0.68rem;
    color: var(--fog);
  }

  .site-nav__link[aria-current="page"] .site-nav__text::before {
    content: "▸ ";
    color: var(--amber);
  }

  .site-nav__foot {
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    margin: 24px 0 0;
    padding: 0;
    border-left: 0;
  }

  .site-nav__foot .btn { width: 100%; padding-block: 14px; }

  .site-nav__utility {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
  }

  body.nav-open { overflow: hidden; }

  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .header-inner { min-height: 68px; }

  .brand__sub { display: none; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 20px; }

  .footer-legal-links { margin-left: 0; width: 100%; }

  .footer-bottom { gap: 8px 18px; }
}

@media (max-width: 460px) {
  .nav-toggle__label { display: none; }

  .footer-contact__row { grid-template-columns: 1fr; gap: 2px; }
}

/* 9. 动效退让
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .js-motion [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .header-progress { display: none !important; }
}