/* ==========================================================================
   IM赛场 — /assets/site.css
   共享外壳：reset、变量、中文排版、页头、页脚、通用组件
   ========================================================================== */

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--ink-950);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.06;
}

p { margin: 0; }

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

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

a:hover { color: var(--paper); }

button {
  font: inherit;
  color: inherit;
}

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

::selection {
  background: var(--orange);
  color: #080d18;
}

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink-950: #060B18;
  --ink-900: #0B1428;
  --ink-800: #12203C;
  --ink-700: #1B2E52;

  --orange: #FF5B23;
  --cyan: #2BE6E0;
  --green: #3DD68C;
  --basket: #FF8A3D;
  --tennis: #F2E14C;

  --paper: #F4F6FA;
  --muted: #9AA7BF;

  --accent: var(--orange);
  --accent-soft: rgba(255, 91, 35, 0.14);

  --rail-w: 300px;
  --gutter: clamp(18px, 4vw, 48px);
  --cut: 18px;

  --font-display: "Barlow Condensed", "Oswald", "Source Han Sans SC", "Noto Sans SC",
    "PingFang SC", system-ui, sans-serif;
  --font-body: "Inter", "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", ui-monospace,
    Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 480ms;
}

/* 专题色相：只换色，不换骨架 */
[data-topic="football"] {
  --accent: var(--green);
  --accent-soft: rgba(61, 214, 140, 0.14);
}
[data-topic="basketball"] {
  --accent: var(--basket);
  --accent-soft: rgba(255, 138, 61, 0.14);
}
[data-topic="tennis"] {
  --accent: var(--tennis);
  --accent-soft: rgba(242, 225, 76, 0.14);
}
[data-topic="default"] {
  --accent: var(--orange);
  --accent-soft: rgba(255, 91, 35, 0.14);
}

/* ---------- 3. 排版工具 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 0.96;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 容器 / 网格 ---------- */
.wrap {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid {
  display: grid;
  gap: var(--gap, clamp(16px, 2.4vw, 26px));
}

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

@media (min-width: 700px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 5. 正文容器 ---------- */
.prose {
  max-width: 68ch;
}

.prose > * + * {
  margin-top: 1.1em;
}

.prose p {
  color: rgba(244, 246, 250, 0.85);
}

.prose h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  margin-top: 2em;
  letter-spacing: -0.03em;
}

.prose h3 {
  font-size: clamp(1.15rem, 1.6vw, 1.3rem);
  margin-top: 1.7em;
  letter-spacing: -0.02em;
}

.prose li {
  position: relative;
  padding-left: 1.4em;
  color: rgba(244, 246, 250, 0.85);
}

.prose li + li { margin-top: 0.5em; }

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 9px;
  height: 2px;
  background: var(--accent);
}

/* ---------- 6. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  background: var(--orange);
  color: #070d18;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: background-color 200ms var(--ease), color 200ms var(--ease), transform 200ms var(--ease);
}

.btn:hover {
  background: var(--cyan);
  color: #05131a;
  transform: translateY(-2px);
}

.btn:active { transform: translateY(0); }

.btn--ghost {
  background: var(--ink-800);
  color: var(--paper);
}

.btn--ghost:hover {
  background: var(--ink-700);
  color: var(--cyan);
}

/* ---------- 7. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.crumbs a {
  color: var(--muted);
}

.crumbs a:hover {
  color: var(--cyan);
}

.crumbs__sep {
  opacity: 0.45;
}

.crumbs [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 8. 面板 / 标签 / 数据带 ---------- */
.panel {
  position: relative;
  background: var(--ink-900);
  padding: var(--pad, clamp(22px, 3vw, 34px));
}

.panel--cut {
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.panel--card {
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.plate {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px 8px 10px;
  background: var(--ink-800);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.plate__idx {
  color: var(--accent);
  font-weight: 700;
}

.data-strip {
  display: flex;
  gap: 14px;
  padding: 6px 0 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-700) transparent;
  overscroll-behavior-x: contain;
}

.data-strip > * {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.data-strip::-webkit-scrollbar { height: 6px; }
.data-strip::-webkit-scrollbar-thumb { background: var(--ink-700); }

/* ---------- 9. 图片容器基础规则 ---------- */
.media {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--ink-800) 0%, var(--ink-900) 62%, var(--ink-950) 100%);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.media::after {
  content: "";
  position: absolute;
  inset: auto -20% -60% -20%;
  height: 70%;
  background: radial-gradient(ellipse at 30% 100%, var(--accent-soft), transparent 70%);
  pointer-events: none;
}

.media img,
.media video {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }

.media__cap {
  position: absolute;
  z-index: 2;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 8px 14px;
  background: rgba(6, 11, 24, 0.74);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 10. 栏目标题 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 24px;
  padding-bottom: 18px;
  margin-bottom: clamp(22px, 3vw, 36px);
  border-bottom: 1px solid var(--ink-700);
}

.section-head__title {
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
}

/* ---------- 11. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  z-index: 200;
  top: 10px;
  left: 10px;
  padding: 12px 22px;
  background: var(--orange);
  color: #070d18;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transform: translateY(-220%);
  transition: transform 200ms var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  color: #070d18;
}

/* ---------- 12. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(6, 11, 24, 0.94);
  border-bottom: 1px solid var(--ink-700);
  backdrop-filter: blur(10px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 64px;
  padding: 10px var(--gutter);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
  text-decoration: none;
}

.brand:hover { color: var(--paper); }

.brand__mark {
  position: relative;
  flex: none;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: var(--ink-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.brand__mark::before {
  content: "";
  width: 15px;
  height: 15px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.brand__mark::after {
  content: "";
  position: absolute;
  right: 4px;
  bottom: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.22rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
}

.brand__coord {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  background: var(--ink-800);
  border: 0;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background-color 200ms var(--ease), color 200ms var(--ease);
}

.nav-toggle:hover {
  background: var(--ink-700);
  color: var(--cyan);
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: var(--orange);
  transition: transform 240ms var(--ease), opacity 180ms var(--ease), background-color 200ms var(--ease);
}

.site-header[data-open] .nav-toggle__bars i:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.site-header[data-open] .nav-toggle__bars i:nth-child(2) {
  opacity: 0;
}
.site-header[data-open] .nav-toggle__bars i:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}
.site-header[data-open] .nav-toggle__bars i {
  background: var(--cyan);
}

/* 导航（移动端抽屉） */
.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  max-height: 0;
  overflow: hidden;
  visibility: hidden;
  background: var(--ink-900);
  border-bottom: 1px solid var(--ink-700);
  box-shadow: 0 24px 40px -28px rgba(0, 0, 0, 0.9);
  transition: max-height 320ms var(--ease), visibility 0s linear 320ms;
}

.site-header[data-open] .site-nav {
  max-height: min(74vh, 540px);
  overflow-y: auto;
  visibility: visible;
  transition: max-height 320ms var(--ease), visibility 0s;
}

.site-nav__list {
  padding: 6px 0 16px;
}

.site-nav__item + .site-nav__item {
  border-top: 1px solid rgba(27, 46, 82, 0.6);
}

.site-nav__link {
  --nav-pad-x: var(--gutter);
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px var(--nav-pad-x) 15px calc(var(--nav-pad-x) + 18px);
  color: var(--paper);
  text-decoration: none;
  transition: color 200ms var(--ease), background-color 200ms var(--ease);
}

.site-nav__link::before {
  content: "";
  position: absolute;
  left: var(--nav-pad-x);
  top: 12px;
  bottom: 12px;
  width: 3px;
  background: var(--orange);
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform 220ms var(--ease), background-color 200ms var(--ease);
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  min-width: 1.8em;
}

.site-nav__label {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.site-nav__link:hover {
  color: var(--cyan);
}

.site-nav__link:hover::before {
  transform: scaleY(1);
  background: var(--cyan);
}

.site-nav__link[aria-current="page"] {
  color: var(--paper);
}

.site-nav__link[aria-current="page"] .site-nav__idx {
  color: var(--orange);
}

.site-nav__link[aria-current="page"]::before {
  transform: scaleY(1);
  background: var(--orange);
}

.site-nav__link[aria-current="page"]:hover {
  color: var(--paper);
}

/* 轨道状态 */
.rail-status {
  display: none;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.rail-status .num {
  color: var(--cyan);
  font-size: 0.82rem;
}

.rail-status__dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  animation: im-pulse 2.4s var(--ease) infinite;
}

@keyframes im-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.72); }
}

/* ---------- 13. 桌面端：侧边轨道 ---------- */
@media (min-width: 1024px) {
  body {
    padding-left: var(--rail-w);
  }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail-w);
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid var(--ink-700);
    backdrop-filter: none;
  }

  .site-header__inner {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    height: 100%;
    padding: 34px 26px 26px;
    min-height: 0;
  }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    margin-top: 34px;
    max-height: none;
    overflow: visible;
    visibility: visible;
    background: transparent;
    border: 0;
    box-shadow: none;
    transition: none;
  }

  .site-nav__list {
    padding: 0;
  }

  .site-nav__item + .site-nav__item {
    border-top: 0;
  }

  .site-nav__link {
    --nav-pad-x: 0px;
    padding: 11px 0 11px 20px;
    gap: 10px;
  }

  .site-nav__link::before {
    top: 8px;
    bottom: 8px;
  }

  .site-nav__label {
    font-size: 1.06rem;
    font-weight: 700;
  }

  .site-nav__idx {
    font-size: 0.68rem;
  }

  .rail-status {
    display: flex;
    margin-top: auto;
    padding-top: 22px;
    border-top: 1px solid var(--ink-700);
  }
}

/* ---------- 14. 滚动进度轨 ---------- */
.scroll-progress {
  position: fixed;
  z-index: 120;
  left: 0;
  top: 0;
  width: 3px;
  height: 100vh;
  pointer-events: none;
  background: linear-gradient(180deg, var(--orange), var(--cyan));
  opacity: 0.85;
  transform: scaleY(0);
  transform-origin: 50% 0;
  will-change: transform;
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  background: var(--ink-900);
  border-top: 1px solid var(--ink-700);
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange) 0 24%, var(--cyan) 24% 40%, transparent 40%);
}

.site-footer__grid {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding: clamp(44px, 5vw, 74px) var(--gutter) clamp(28px, 3vw, 42px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 46px);
}

@media (min-width: 700px) {
  .site-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1100px) {
  .site-footer__grid {
    grid-template-columns: 1.55fr 0.85fr 0.85fr 1.5fr;
  }
  .footer-brand {
    grid-column: auto;
  }
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-brand__line {
  max-width: 34ch;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(244, 246, 250, 0.78);
  margin-top: 8px;
}

.footer-brand__line--muted {
  color: var(--muted);
  font-size: 0.86rem;
}

.footer-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.footer-links li + li {
  margin-top: 10px;
}

.footer-links a {
  display: inline-block;
  position: relative;
  padding-left: 0;
  font-size: 0.94rem;
  color: rgba(244, 246, 250, 0.78);
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}

.footer-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transform: translateY(-50%);
  transition: width 180ms var(--ease);
}

.footer-links a:hover {
  color: var(--cyan);
  padding-left: 16px;
}

.footer-links a:hover::before {
  width: 10px;
}

.footer-contact__list li {
  display: grid;
  grid-template-columns: 5.4em minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(27, 46, 82, 0.9);
  font-size: 0.92rem;
}

.footer-contact__k {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.footer-contact__value {
  color: var(--paper);
  word-break: break-word;
}

.footer-contact__value--mono {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.footer-contact__note {
  margin-top: 14px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--muted);
}

.site-footer__base {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding: 18px var(--gutter) 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  border-top: 1px solid var(--ink-700);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.footer-icp {
  color: var(--paper);
}

.footer-meta {
  color: var(--muted);
}

/* ---------- 16. 显现动效 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 17. 小屏进度轨 ---------- */
@media (max-width: 1023.98px) {
  .scroll-progress {
    width: 100%;
    height: 3px;
    transform: scaleX(0);
    transform-origin: 0 50%;
    background: linear-gradient(90deg, var(--orange), var(--cyan));
  }
}

/* ---------- 18. reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .rail-status__dot { animation: none; }

  .btn:hover,
  .skip-link,
  .nav-toggle__bars i,
  .site-nav,
  .site-nav__link,
  .site-nav__link::before,
  .footer-links a,
  .footer-links a::before {
    transition-duration: 1ms;
  }
}