/* =========================================================
   浩瀚体育站 · /assets/site.css
   共享外壳：reset / 变量 / 排版 / 头部 / 页脚 / 基础组件
   ========================================================= */

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

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

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

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

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

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --abyss-950: #04131F;
  --abyss-900: #062235;
  --ocean-800: #0A3A52;
  --ocean-600: #0E5A73;
  --cyan-400: #2DE2E6;
  --cyan-200: #A8F7F5;
  --coral-500: #FF6B4A;
  --coral-300: #FFA38F;
  --indigo-700: #3A2E63;
  --wine-700: #5A1F35;
  --paper-50: #F4F8F7;
  --ink-900: #0B1B24;
  --slate-400: #8AA3AD;
  --success-500: #35D07F;
  --warning-500: #F5B942;

  --rail-w: 236px;
  --header-h: 68px;
  --container: 1280px;
  --container-read: 760px;

  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-pill: 999px;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-editorial: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  --ease-tide: cubic-bezier(0.22, 0.61, 0.36, 1);
  --grid-line: rgba(45, 226, 230, 0.14);
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--paper-50);
  background-color: var(--abyss-950);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: -1px -1px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (max-width: 1023px) {
  body { padding-top: var(--header-h); }
}

p { max-width: 42em; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

::selection {
  background: var(--cyan-400);
  color: var(--abyss-950);
}

:focus-visible {
  outline: 3px solid var(--cyan-400);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 4. 通用工具与基础组件 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 20px;
}

.container--read { max-width: var(--container-read); }

@media (min-width: 768px) {
  .container { padding-inline: 32px; }
  .container--read { padding-inline: 32px; }
}

@media (min-width: 1280px) {
  .container { padding-inline: 48px; }
  .container--read { padding-inline: 32px; }
}

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

.grid-12 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

@media (min-width: 768px) {
  .grid-12 {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
  }
  .span-3 { grid-column: span 3; }
  .span-4 { grid-column: span 4; }
  .span-5 { grid-column: span 5; }
  .span-6 { grid-column: span 6; }
  .span-7 { grid-column: span 7; }
  .span-8 { grid-column: span 8; }
  .span-12 { grid-column: span 12; }
}

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

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(24px, 3.5vw, 40px);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--paper-50);
}

.section__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate-400);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.18s var(--ease-tide),
    background-color 0.18s var(--ease-tide),
    color 0.18s var(--ease-tide),
    border-color 0.18s var(--ease-tide),
    box-shadow 0.18s var(--ease-tide);
}

.btn--coral {
  background-color: var(--coral-500);
  color: var(--abyss-950);
  box-shadow: 0 10px 26px -16px rgba(255, 107, 74, 0.95);
}

.btn--coral:hover {
  background-color: var(--coral-300);
  transform: translateY(-2px);
}

.btn--ghost {
  background-color: transparent;
  color: var(--cyan-200);
  border-color: rgba(45, 226, 230, 0.42);
}

.btn--ghost:hover {
  color: var(--abyss-950);
  background-color: var(--cyan-200);
  border-color: var(--cyan-200);
  transform: translateY(-2px);
}

.btn--block { width: 100%; }

.btn--sm {
  padding: 10px 16px;
  font-size: 13px;
}

/* 胶囊标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid rgba(45, 226, 230, 0.35);
  border-radius: var(--radius-pill);
  background-color: rgba(45, 226, 230, 0.08);
  color: var(--cyan-200);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.6;
}

.tag--coral {
  background-color: var(--coral-500);
  border-color: transparent;
  color: var(--abyss-950);
  font-weight: 700;
}

.tag--ghost {
  background-color: transparent;
  border-color: rgba(138, 163, 173, 0.45);
  color: var(--slate-400);
}

/* 响应式图片容器 */
.media {
  display: block;
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(45, 226, 230, 0.18);
  border-radius: var(--radius-lg);
  background-image:
    linear-gradient(150deg, var(--ocean-800) 0%, var(--abyss-900) 58%, var(--abyss-950) 100%);
}

.media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }

.media__caption {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--slate-400);
}

/* 面包屑 */
.breadcrumbs {
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-400);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs li::after {
  content: "/";
  color: rgba(45, 226, 230, 0.5);
}

.breadcrumbs li:last-child::after { content: none; }

.breadcrumbs a {
  color: var(--cyan-200);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--cyan-400);
  text-decoration: underline;
}

.breadcrumbs [aria-current="page"] { color: var(--paper-50); }

/* 长文正文 */
.prose {
  max-width: var(--container-read);
  font-size: 16px;
  line-height: 1.85;
  color: #D8E6E7;
}

.prose h2 {
  margin: 2.2em 0 0.6em;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--paper-50);
}

.prose h3 {
  margin: 1.8em 0 0.4em;
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan-200);
}

.prose p { margin-bottom: 1.1em; }

.prose ul,
.prose ol {
  margin-bottom: 1.2em;
  padding-left: 1.3em;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li { margin-bottom: 0.4em; }

.prose a {
  color: var(--cyan-400);
  text-underline-offset: 3px;
}

/* 显现动效 */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.52s var(--ease-tide),
    transform 0.52s var(--ease-tide);
}

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

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: absolute;
  top: -80px;
  left: 12px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background-color: var(--coral-500);
  color: var(--abyss-950);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  transition: top 0.2s var(--ease-tide);
}

.skip-link:focus {
  top: 12px;
}

/* ---------- 6. 头部外壳（移动优先） ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  background-color: rgba(6, 34, 53, 0.96);
  border-bottom: 1px solid rgba(45, 226, 230, 0.22);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.rail {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  height: var(--header-h);
  padding: 0 14px;
}

/* 品牌舱 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px;
  border-radius: var(--radius-md);
  color: var(--paper-50);
  text-decoration: none;
  transition: transform 0.18s var(--ease-tide);
}

.brand:hover { transform: translateY(-1px); }

.brand__mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(45, 226, 230, 0.35);
  border-radius: 12px;
  background-image: radial-gradient(circle at 30% 20%, rgba(45, 226, 230, 0.28), rgba(4, 19, 31, 0.92));
}

.brand__mark svg {
  display: block;
  width: 22px;
  height: 22px;
}

.brand__text { display: block; min-width: 0; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.brand__desc {
  display: none;
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.6;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

/* 移动导航按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid rgba(45, 226, 230, 0.4);
  border-radius: var(--radius-pill);
  background-color: rgba(45, 226, 230, 0.1);
  color: var(--cyan-200);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 0.18s var(--ease-tide), border-color 0.18s var(--ease-tide);
}

.nav-toggle:hover {
  background-color: rgba(45, 226, 230, 0.2);
  border-color: var(--cyan-400);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 0.24s var(--ease-tide), opacity 0.18s var(--ease-tide);
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 导航抽屉（移动） */
.site-nav {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: min(320px, 84vw);
  padding: calc(var(--header-h) + 20px) 16px 26px;
  overflow-y: auto;
  border-right: 1px solid rgba(45, 226, 230, 0.28);
  background-image: linear-gradient(160deg, #062235 0%, #04131F 72%);
  box-shadow: 28px 0 70px -40px rgba(0, 0, 0, 0.95);
  transform: translateX(-102%);
  transition: transform 0.34s var(--ease-tide);
}

.site-header[data-open="true"] .site-nav { transform: translateX(0); }

.site-nav__label {
  margin: 0 0 4px 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(138, 163, 173, 0.85);
}

.site-nav__list {
  display: grid;
  gap: 4px;
}

.site-nav__item { display: block; }

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px 11px 14px;
  border-radius: 14px;
  color: var(--slate-400);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  transition:
    color 0.18s var(--ease-tide),
    background-color 0.18s var(--ease-tide),
    box-shadow 0.18s var(--ease-tide);
}

.site-nav__link:hover {
  color: #EAF7F8;
  background-color: rgba(45, 226, 230, 0.08);
}

.site-nav__link[aria-current="page"] {
  color: var(--paper-50);
  background-image: linear-gradient(90deg, rgba(45, 226, 230, 0.2), rgba(45, 226, 230, 0.03));
  box-shadow: inset 3px 0 0 0 var(--cyan-400);
}

.site-nav__link[aria-current="page"] .site-nav__index { color: var(--coral-500); }

.site-nav__index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(168, 247, 245, 0.55);
  transition: color 0.18s var(--ease-tide);
}

.site-nav__text { min-width: 0; }

.site-nav__foot {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px dashed rgba(45, 226, 230, 0.22);
  display: grid;
  gap: 12px;
}

.site-nav__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.8;
  letter-spacing: 0.06em;
  color: var(--slate-400);
}

/* 遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 85;
  background-color: rgba(4, 19, 31, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s var(--ease-tide);
}

.site-header[data-open="true"] .nav-scrim {
  opacity: 1;
  pointer-events: auto;
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background-image: linear-gradient(90deg, var(--cyan-400), var(--coral-500));
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  transition: transform 0.12s linear;
  pointer-events: none;
}

html.nav-open { overflow: hidden; }

/* ---------- 7. 页脚（移动优先） ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(45, 226, 230, 0.18);
  background-color: var(--abyss-950);
  background-image: linear-gradient(180deg, rgba(45, 226, 230, 0.06) 0%, rgba(4, 19, 31, 0) 38%);
  color: var(--slate-400);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(45, 226, 230, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45, 226, 230, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(circle at 18% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 18% 0%, #000 0%, transparent 72%);
}

.footer__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 72px) 20px clamp(28px, 4vw, 40px);
}

.footer__wordmark {
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--paper-50);
  background-image: linear-gradient(100deg, var(--paper-50) 28%, var(--cyan-400) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer__tagline {
  margin-bottom: 14px;
  max-width: 24em;
  font-family: var(--font-editorial);
  font-size: clamp(16px, 1.6vw, 19px);
  font-weight: 600;
  line-height: 1.7;
  color: var(--cyan-200);
}

.footer__service {
  max-width: 34em;
  font-size: 13px;
  line-height: 1.85;
  color: var(--slate-400);
}

.footer__heading {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.footer__list {
  display: grid;
  gap: 9px;
  font-size: 14px;
}

.footer__list a {
  display: inline-block;
  color: var(--slate-400);
  text-decoration: none;
  transition: color 0.18s var(--ease-tide), padding-left 0.18s var(--ease-tide);
}

.footer__list a:hover {
  color: var(--cyan-200);
  padding-left: 4px;
}

.footer__list--plain li {
  display: grid;
  gap: 2px;
  font-size: 14px;
  line-height: 1.7;
  color: #C6D7DA;
  overflow-wrap: anywhere;
}

.footer__k {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(138, 163, 173, 0.9);
}

.footer__bottom {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  max-width: var(--container);
  margin-inline: auto;
  padding: 18px 20px 30px;
  border-top: 1px solid rgba(45, 226, 230, 0.14);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer__copy { margin: 0; color: var(--slate-400); }

.footer__icp { margin: 0; color: rgba(138, 163, 173, 0.8); }

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 0;
}

.footer__legal a {
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease-tide), border-color 0.18s var(--ease-tide);
}

.footer__legal a:hover {
  color: var(--coral-300);
  border-bottom-color: currentColor;
}

@media (min-width: 640px) {
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (min-width: 900px) {
  .footer__inner {
    grid-template-columns: 1.5fr 1fr 1.2fr;
    align-items: start;
  }
  .footer__brand { grid-column: auto; }
  .footer__legal { margin-left: auto; }
}

@media (min-width: 768px) {
  .footer__inner { padding-inline: 32px; }
  .footer__bottom { padding-inline: 32px; }
}

@media (min-width: 1280px) {
  .footer__inner { padding-inline: 48px; }
  .footer__bottom { padding-inline: 48px; }
}

/* ---------- 8. 桌面端：侧边轨道 ---------- */
@media (min-width: 1024px) {
  body {
    padding-left: var(--rail-w);
    padding-top: 0;
  }

  .site-header {
    top: 0;
    bottom: 0;
    left: 0;
    right: auto;
    width: var(--rail-w);
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid rgba(45, 226, 230, 0.2);
    background-image: linear-gradient(180deg, #062235 0%, #04131F 58%, #04131F 100%);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .rail {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 18px;
    height: 100%;
    padding: 24px 16px 22px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(45, 226, 230, 0.35) transparent;
  }

  .rail::-webkit-scrollbar { width: 6px; }
  .rail::-webkit-scrollbar-thumb {
    background-color: rgba(45, 226, 230, 0.3);
    border-radius: 3px;
  }

  .brand {
    padding: 12px;
    gap: 12px;
    border: 1px solid rgba(45, 226, 230, 0.24);
    background-image: linear-gradient(150deg, rgba(10, 58, 82, 0.95), rgba(6, 34, 53, 0.75));
    box-shadow: 0 22px 46px -36px rgba(45, 226, 230, 0.9);
  }

  .brand__desc { display: block; }
  .brand__name { font-size: 17px; }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    width: auto;
    padding: 0;
    margin-top: 4px;
    overflow: visible;
    border-right: 0;
    background-image: none;
    box-shadow: none;
    transform: none;
    transition: none;
  }

  .site-nav__label { margin-left: 12px; }

  .site-nav__link {
    padding: 11px 12px 11px 14px;
    font-size: 15px;
  }

  .nav-scrim { display: none; }

  .scroll-progress {
    top: 0;
    bottom: 0;
    left: auto;
    right: -1px;
    width: 2px;
    height: auto;
    background-image: linear-gradient(180deg, var(--cyan-400), var(--coral-500));
    transform: scaleY(var(--progress, 0));
    transform-origin: center top;
  }
}

/* ---------- 9. 降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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

  .scroll-progress { transition: none; }
}