/* ==========================================================================
   博万体育APP 官方中文站 — 共享样式表 /assets/site.css
   夜场黑底 + 荧光青 / 活力橙双强调，粗野主义块面，画册式留白
   ========================================================================== */

:root {
  /* 色彩 */
  --ink: #070B14;
  --panel: #0E1729;
  --line: #16233D;
  --cyan: #00E5D0;
  --orange: #FF6B1A;
  --green: #35D06A;
  --red: #FF3B4E;
  --white: #E8EEF7;
  --muted: #93A3BC;
  --edge: #2A3A5C;

  /* 排版 */
  --font-display: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Roboto Mono", "Courier New", monospace;

  --fs-index: 12.5px;
  --fs-small: 14px;
  --fs-body: 17px;
  --fs-lead: 20px;
  --fs-h3: 26px;
  --fs-h2: clamp(28px, 4.4vw, 44px);
  --fs-h1: clamp(38px, 7vw, 76px);
  --fs-display: clamp(46px, 11vw, 112px);

  /* 布局 */
  --shell: 1240px;
  --gutter: clamp(18px, 4vw, 56px);
  --gap: clamp(20px, 2.6vw, 34px);
  --block: clamp(48px, 8vw, 110px);

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 220ms;

  --shadow-hard: 6px 6px 0 var(--edge);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  background-color: var(--ink);
  background-image:
    radial-gradient(1200px 620px at 80% -8%, rgba(0, 229, 208, 0.10), transparent 62%),
    radial-gradient(900px 520px at 6% 4%, rgba(255, 107, 26, 0.08), transparent 66%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: transparent;
  color: var(--white);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.01em;
}

p { margin: 0; }

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

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

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

button { font: inherit; color: inherit; }

[hidden] { display: none !important; }

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

/* ---------- 基础工具类 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--orange);
  flex: none;
}

.display {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  font-weight: 250;
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0;
}

.display em {
  font-style: normal;
  color: var(--cyan);
}

.rule {
  height: 3px;
  border: 0;
  margin: 0;
  background: var(--edge);
}

.rule--cyan { background: var(--cyan); }

/* ---------- 章节 ---------- */
.section { padding-block: var(--block); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 28px;
  padding-bottom: 18px;
  margin-bottom: clamp(24px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
}

.section__title {
  font-size: var(--fs-h2);
  font-weight: 900;
  letter-spacing: -0.015em;
  margin: 0;
}

.section__lead {
  max-width: 34em;
  font-size: var(--fs-small);
  line-height: 1.9;
  color: var(--muted);
  margin: 0;
}

/* ---------- 正文容器 ---------- */
.prose {
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--white);
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 { font-size: var(--fs-h3); font-weight: 900; margin-top: 1.8em; }
.prose h3 { font-size: 20px; font-weight: 800; margin-top: 1.5em; }
.prose a { color: var(--cyan); border-bottom: 1px solid currentColor; }
.prose ul { list-style: none; }
.prose li {
  position: relative;
  padding-left: 20px;
  margin-top: 0.5em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--orange);
}
.prose strong { color: var(--white); font-weight: 800; }

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: var(--gap);
}

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

@media (min-width: 760px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1040px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--split { grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr); }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--white);
  background: var(--panel);
  border: 2px solid var(--edge);
  cursor: pointer;
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--edge);
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #0A0F1A;
  box-shadow: 5px 5px 0 rgba(122, 44, 0, 0.85);
}

.btn--primary:hover {
  background: #FF8140;
  box-shadow: 7px 7px 0 rgba(122, 44, 0, 0.85);
}

.btn--ghost {
  background: transparent;
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--ghost:hover { box-shadow: 5px 5px 0 rgba(0, 229, 208, 0.5); }

.btn--line {
  background: transparent;
  border-color: var(--edge);
  color: var(--muted);
}

.btn--line:hover { color: var(--white); border-color: var(--cyan); }

/* ---------- 面包屑 ---------- */
.breadcrumb { margin-bottom: clamp(18px, 3vw, 34px); }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--muted);
}

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

.breadcrumb__item:not(:last-child)::after {
  content: "/";
  color: var(--edge);
}

.breadcrumb__link { color: var(--muted); }
.breadcrumb__link:hover { color: var(--cyan); }
.breadcrumb__current { color: var(--cyan); }

/* ---------- 图片容器（供页面阶段放置素材） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 2px solid var(--edge);
  background:
    linear-gradient(150deg, #12203A 0%, #0A1120 58%, #0E1729 100%);
}

.media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  background: linear-gradient(180deg, transparent, rgba(7, 11, 20, 0.88));
  pointer-events: none;
}

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

.media--square { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--pano { aspect-ratio: 21 / 9; }
.media--field { aspect-ratio: 4 / 3; }

.media--chart {
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(180deg, rgba(0, 229, 208, 0.09), transparent 70%),
    repeating-linear-gradient(0deg, var(--line) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 34px),
    var(--panel);
}

.media--chart::after { display: none; }

.media__caption {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  z-index: 2;
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--muted);
}

.media__tag {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  background: var(--panel);
  border: 2px solid var(--edge);
  transition:
    transform 180ms var(--ease),
    border-color 180ms var(--ease),
    box-shadow 180ms var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 6px 6px 0 rgba(0, 229, 208, 0.18);
}

.card.is-hidden { display: none; }

.card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.card__title {
  font-size: var(--fs-h3);
  font-weight: 900;
  letter-spacing: -0.012em;
  margin: 0 0 10px;
}

.card__meta {
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--muted);
}

.card__body {
  font-size: var(--fs-small);
  line-height: 1.85;
  color: var(--muted);
  max-width: 36em;
}

/* ---------- 标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--muted);
  background: rgba(22, 35, 61, 0.6);
  border: 1px solid var(--edge);
  white-space: nowrap;
}

.chip--cyan { color: var(--cyan); border-color: var(--cyan); }
.chip--orange { color: var(--orange); border-color: var(--orange); }
.chip--green { color: var(--green); border-color: var(--green); }
.chip--live { color: var(--red); border-color: var(--red); }

/* ---------- 筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-btn {
  padding: 9px 16px;
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--muted);
  background: transparent;
  border: 2px solid var(--edge);
  cursor: pointer;
  transition:
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.filter-btn:hover {
  color: var(--white);
  border-color: var(--cyan);
}

.filter-btn[aria-pressed="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.filter-empty {
  padding: 32px 0;
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 数据单元 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 3px solid var(--edge);
}

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--white);
}

.stat__label {
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 装饰与工具 ---------- */
.to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 70;
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: var(--cyan);
  border: 2px solid var(--cyan);
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.to-top:hover { transform: translateY(-2px); background: var(--orange); border-color: var(--orange); }

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

/* ==========================================================================
   页头
   ========================================================================== */

.site-header {
  position: relative;
  z-index: 40;
  background: var(--ink);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 120;
  padding: 12px 20px;
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--ink);
  background: var(--cyan);
  border: 2px solid var(--ink);
}

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

/* 滚动进度 */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 90;
  background: rgba(22, 35, 61, 0.9);
  pointer-events: none;
}

.progress-bar__fill {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

/* 上层：品牌署名与版本号 */
.masthead {
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.masthead__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 32px;
  padding-block: 24px;
}

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

.brand__name {
  font-size: clamp(20px, 2.3vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.brand__badge {
  padding: 3px 8px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--cyan);
  white-space: nowrap;
}

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

.masthead__note {
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.masthead__note .num { color: var(--white); }

.masthead__meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: var(--fs-index);
  letter-spacing: 0.12em;
  color: var(--muted);
}

.masthead__tagline {
  padding-right: 18px;
  border-right: 1px solid var(--line);
}

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

/* 下层：栏目带 */
.primary-nav {
  position: relative;
  background: var(--panel);
  border-bottom: 3px solid var(--edge);
}

.nav__inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 60px;
}

.nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(18px, 2.6vw, 40px);
}

.nav__link {
  position: relative;
  display: block;
  padding: 19px 2px;
  font-size: 13.5px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--white);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 12px;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width var(--dur) var(--ease);
}

.nav__link:hover { color: var(--cyan); }
.nav__link:hover::after { width: 100%; }

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

.nav__link[aria-current="page"]::after { width: 100%; }

/* 移动端索引按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--white);
  background: transparent;
  border: 0;
  cursor: pointer;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  flex: none;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.primary-nav[data-open="true"] .nav-toggle__bars { background: transparent; }
.primary-nav[data-open="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.primary-nav[data-open="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* 悬浮快捷入口 */
.quick-rail {
  position: fixed;
  right: 0;
  top: 50%;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 6px;
  background: rgba(14, 23, 41, 0.94);
  border: 2px solid var(--edge);
  border-right: 0;
  opacity: 0;
  pointer-events: none;
  transform: translate(18px, -50%);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.quick-rail[data-visible="true"] {
  opacity: 1;
  pointer-events: auto;
  transform: translate(0, -50%);
}

.quick-rail__link {
  writing-mode: vertical-rl;
  padding: 14px 8px;
  font-size: var(--fs-index);
  letter-spacing: 0.2em;
  color: var(--muted);
  border-left: 3px solid transparent;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.quick-rail__link:hover,
.quick-rail__link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
}

/* ==========================================================================
   页脚
   ========================================================================== */

.site-footer {
  position: relative;
  z-index: 20;
  margin-top: clamp(64px, 9vw, 130px);
  background: var(--panel);
  border-top: 3px solid var(--edge);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  padding-block: clamp(46px, 7vw, 88px);
}

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

@media (min-width: 1080px) {
  .footer__grid { grid-template-columns: 1.5fr 1fr 1.2fr 1.2fr; }
}

.footer__col { min-width: 0; }

.footer__col--brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer__tagline {
  max-width: 24em;
  font-size: var(--fs-small);
  line-height: 1.9;
  color: var(--muted);
}

.footer__title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  font-size: var(--fs-index);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.footer__title::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--orange);
  flex: none;
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.footer__link {
  position: relative;
  display: inline-block;
  font-size: var(--fs-small);
  letter-spacing: 0.05em;
  color: var(--white);
  transition: color var(--dur) var(--ease);
}

.footer__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width var(--dur) var(--ease);
}

.footer__link:hover { color: var(--cyan); }
.footer__link:hover::after { width: 100%; }

.footer__contact {
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  color: var(--white);
  word-break: break-word;
}

.footer__note {
  margin-top: 12px;
  font-size: var(--fs-index);
  line-height: 1.85;
  letter-spacing: 0.04em;
  color: var(--muted);
  max-width: 30em;
}

.footer__note--icp { color: var(--cyan); }

.footer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding-block: 22px;
  border-top: 1px solid var(--line);
}

.footer__copy {
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--muted);
}

.footer__policy {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.footer__policy-link {
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.footer__policy-link:hover { color: var(--cyan); }

/* ==========================================================================
   动效
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  [data-reveal] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 240ms var(--ease), transform 240ms var(--ease);
  }

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

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

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

  .quick-rail,
  .quick-rail[data-visible="true"] {
    transform: translate(0, -50%);
  }
}

/* ==========================================================================
   响应式：移动端索引面板
   ========================================================================== */

@media (max-width: 1000px) {
  .quick-rail { display: none; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .nav__inner {
    justify-content: space-between;
    min-height: 56px;
  }

  .nav__list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 50;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--gutter) 22px;
    background: var(--panel);
    border-bottom: 3px solid var(--edge);
  }

  .primary-nav[data-open="true"] .nav__list { display: flex; }

  .nav__link {
    padding: 15px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--line);
  }

  .nav__link::after { bottom: 8px; }

  .masthead__inner {
    padding-block: 18px;
    gap: 8px 20px;
  }
}

@media (max-width: 720px) {
  .masthead__tagline { display: none; }
  .masthead__meta { gap: 12px; }
  .masthead__note { font-size: var(--fs-index); letter-spacing: 0.08em; }

  .footer__bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .to-top { right: 12px; bottom: 12px; }
}

@media (max-width: 520px) {
  .brand { gap: 9px; }
  .brand__badge { font-size: 10.5px; padding: 2px 6px; }
  .masthead__meta { font-size: 11.5px; letter-spacing: 0.08em; }
}