/* ============================================================
   bat365主站 · 共享样式 /assets/site.css
   01 重置 · 02 变量 · 03 基座排版 · 04 通用工具
   05 按钮 · 06 卡片与标签 · 07 图片位 · 08 面包屑
   09 页头 · 10 页脚 · 11 动效 · 12 响应式
   ============================================================ */

/* ---------- 01 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

ul, ol { list-style: none; }

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

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

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

a { color: inherit; }

hr { border: 0; }

/* ---------- 02 变量 ---------- */
:root {
  --ink-900: #0B0F14;
  --blue-900: #072B45;
  --blue-500: #14567F;
  --cyan: #22E6D2;
  --orange: #FF6B2C;
  --white: #F4F8FB;
  --mist: #9BB0C4;
  --line: #2A4A66;
  --green: #35C08A;
  --amber: #FFC24B;

  --grid-line: rgba(42, 74, 102, 0.26);
  --hairline: rgba(42, 74, 102, 0.9);

  --font-display: "Archivo", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell-max: 1440px;
  --shell-pad: clamp(16px, 3vw, 48px);
  --radius: 2px;
}

/* ---------- 03 基座排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--white);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p { max-width: 68ch; text-wrap: pretty; }

::selection {
  background: var(--cyan);
  color: var(--ink-900);
}

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

/* ---------- 04 通用工具 ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

.section { padding-block: clamp(40px, 6vw, 88px); }

.display {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(48px, 7vw, 112px);
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.lede {
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.7;
  color: var(--mist);
  max-width: 56ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--cyan);
  flex: none;
}

.u-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  font-variant-numeric: tabular-nums;
  color: var(--mist);
}

.u-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

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

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}

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

.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.text-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 230, 210, 0.4);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--cyan);
}

.prose {
  max-width: 68ch;
  color: var(--white);
}

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

.prose h2 {
  font-size: clamp(22px, 2.4vw, 30px);
  margin-top: 1.9em;
}

.prose h3 {
  font-size: 19px;
  margin-top: 1.7em;
}

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

.prose li {
  position: relative;
  padding-left: 22px;
}

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

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

/* ---------- 05 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 24px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--white);
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease,
              border-color 0.18s ease, box-shadow 0.18s ease, transform 0.12s ease;
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--cyan);
  box-shadow: inset 0 0 0 1px var(--cyan);
  background-color: rgba(34, 230, 210, 0.06);
}

.btn:active { transform: scale(0.985); }

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #180800;
  font-weight: 700;
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: #ff8147;
  border-color: #ff8147;
  box-shadow: inset 0 0 0 1px #ff8147;
  color: #180800;
}

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

.btn--sm {
  min-height: 38px;
  padding: 0 16px;
  font-size: 13px;
}

/* ---------- 06 卡片与标签 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(7, 43, 69, 0.92), rgba(7, 43, 69, 0.68));
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.card:hover,
.card:focus-within {
  border-color: var(--cyan);
  box-shadow: inset 0 0 0 1px var(--cyan);
  background-color: rgba(20, 86, 127, 0.24);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  white-space: nowrap;
}

.tag--live {
  color: var(--green);
  border-color: rgba(53, 192, 138, 0.45);
}

.tag--alert {
  color: var(--amber);
  border-color: rgba(255, 194, 75, 0.45);
}

.status-dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 230, 210, 0.16);
}

.status-dot--check {
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(53, 192, 138, 0.16);
}

/* ---------- 07 图片位 ---------- */
.figure { margin: 0; }

.figure-frame {
  position: relative;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(20, 86, 127, 0.55), rgba(7, 43, 69, 0.95)),
    var(--blue-900);
}

.figure-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(34, 230, 210, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 230, 210, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
}

.figure-frame > img,
.figure-frame > svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.figure-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ---------- 08 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: rgba(155, 176, 196, 0.45);
}

.breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s ease;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--cyan); }

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

/* ---------- 09 页头 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 0 0 var(--radius) 0;
  text-decoration: none;
  transform: translateY(-120%);
  transition: transform 0.16s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11, 15, 20, 0.94);
  border-bottom: 1px solid var(--hairline);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 14px var(--shell-pad);
}

.brand-block {
  flex: none;
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}

.brand-link {
  display: block;
  text-decoration: none;
  color: var(--white);
}

.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.brand-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.brand-version {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.brand-sync {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.brand-link:hover .brand-name,
.brand-link:focus-visible .brand-name { color: var(--cyan); }

.site-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.6vw, 26px);
}

.nav-item { flex: none; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 0;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s ease;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(155, 176, 196, 0.7);
  transition: color 0.18s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 24px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--white); }

.nav-link:hover .nav-index,
.nav-link:focus-visible .nav-index { color: var(--cyan); }

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

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

.nav-link[aria-current="page"] .nav-index { color: var(--cyan); }

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

.quick-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease,
              box-shadow 0.18s ease, background-color 0.18s ease;
}

.icon-btn:hover,
.icon-btn:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: inset 0 0 0 1px var(--cyan);
  background-color: rgba(34, 230, 210, 0.06);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--cyan);
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--white);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  background: rgba(42, 74, 102, 0.55);
}

.scroll-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 62%, var(--orange) 100%);
  transition: transform 0.12s linear;
}

/* ---------- 10 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 9vw, 120px);
  color: var(--white);
  background: linear-gradient(180deg, rgba(7, 43, 69, 0.5), var(--blue-900) 42%);
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(240px, 1.05fr) minmax(0, 2.4fr) minmax(240px, 1fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(40px, 5vw, 72px) var(--shell-pad) clamp(28px, 3vw, 48px);
}

.footer-brand-link {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
  text-decoration: none;
  border-left: 2px solid var(--cyan);
  padding-left: 12px;
  transition: color 0.18s ease;
}

.footer-brand-link:hover,
.footer-brand-link:focus-visible { color: var(--cyan); }

.footer-brand-meta {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  max-width: none;
}

.footer-brand-desc {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

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

.footer-link {
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s ease, text-decoration-color 0.18s ease;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--white);
  text-decoration: underline;
  text-decoration-color: var(--cyan);
  text-underline-offset: 4px;
}

.footer-list--plain {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.footer-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--white);
}

.footer-legal {
  border-top: 1px solid var(--line);
}

.footer-legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 18px var(--shell-pad) 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.footer-legal-copy,
.footer-legal-note { max-width: none; }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-legal-links a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s ease;
}

.footer-legal-links a:hover,
.footer-legal-links a:focus-visible {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 11 动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

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

/* ---------- 12 响应式 ---------- */
@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; margin-left: auto; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    max-height: calc(100vh - 76px);
    overflow-y: auto;
    padding: 8px var(--shell-pad) 24px;
    background: rgba(7, 43, 69, 0.99);
    border-bottom: 1px solid var(--cyan);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    display: flex;
    align-items: baseline;
    width: 100%;
    padding: 15px 0;
    font-size: 16px;
    border-bottom: 1px solid rgba(42, 74, 102, 0.7);
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] { color: var(--cyan); }

  .quick-bar {
    margin-left: auto;
    margin-right: 10px;
    padding-left: 0;
    border-left: 0;
  }

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

  .footer-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (max-width: 900px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-4, .col-5, .col-6, .col-7, .col-8, .col-12 { grid-column: 1 / -1; }
}

@media (max-width: 700px) {
  body {
    font-size: 16px;
    background-size: 64px 64px;
  }

  .header-inner { padding-block: 12px; }

  .brand-name { font-size: 17px; }

  .brand-sync { display: none; }

  .quick-bar { display: none; }

  .nav-toggle { margin-left: auto; }

  .footer-legal-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}

@media (max-width: 560px) {
  .footer-nav { grid-template-columns: 1fr; }
}

@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;
    scroll-behavior: auto !important;
  }

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