/* ============================================================
   极速彩指南 · 共享样式表  /assets/site.css
   深空黑底座 · 电光蓝结构 · 荧光橙点位 · 精密直角网格
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-space) + 16px);
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption,
blockquote, dl, dt, dd, table, th, td {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink: #06070B;
  --ink-2: #0A0D14;
  --ink-3: #101725;
  --blue: #1F6BFF;
  --blue-soft: #A9C6FF;
  --blue-dim: #12346F;
  --orange: #FF6B1A;
  --amber: #FFB628;
  --mint: #23D3A0;
  --cream: #F5F0E6;
  --brown: #17120E;
  --haze: #93A6C2;
  --grid: #2B3A55;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", "Helvetica Neue", Arial,
    system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --shell: 1320px;
  --gutter: 24px;
  --header-space: 96px;
  --radius: 0px;

  --ease: cubic-bezier(.2, .7, .2, 1);
  --dur: .32s;

  --grid-tile: 24px;
}

/* ---------- 3. 中文排版底座 ---------- */
body {
  margin: 0;
  padding-top: var(--header-space);
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -.01em;
}

p { text-wrap: pretty; }

strong { font-weight: 700; color: var(--cream); }

em { font-style: normal; color: var(--blue-soft); }

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

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

.lead {
  font-size: clamp(17px, 1.6vw, 19px);
  line-height: 1.8;
  color: var(--blue-soft);
  max-width: 62ch;
}

.display {
  font-size: clamp(34px, 6.4vw, 72px);
  font-weight: 900;
  line-height: 1.03;
  letter-spacing: -.02em;
}

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 104px);
}

.section--dark { background: var(--ink); color: var(--cream); }

.section--cream { background: var(--cream); color: var(--brown); }

.section--cream .muted { color: #6B5B4C; }

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

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--grid);
  margin-bottom: clamp(24px, 3vw, 40px);
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--orange);
}

.section-title {
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
}

.section-note {
  margin-left: auto;
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: .06em;
  color: var(--haze);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.2;
  transition: background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.btn-primary {
  background: var(--blue);
  border-color: var(--blue);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: #3D80FF;
  border-color: #3D80FF;
  box-shadow: 0 10px 30px rgba(31, 107, 255, .35);
}

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

.btn-ghost:hover {
  border-color: var(--blue-soft);
  color: #FFFFFF;
}

.btn-accent {
  background: var(--orange);
  border-color: var(--orange);
  color: #1A0A02;
}

.btn-accent:hover { background: #FF8244; border-color: #FF8244; }

.btn-compact {
  padding: 9px 17px;
  font-size: 13.5px;
  border-radius: 999px;
}

/* ---------- 6. 页内索引 ---------- */
.index-list {
  border-top: 1px solid var(--grid);
}

.index-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 2px;
  border-bottom: 1px solid var(--grid);
}

.index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
  min-width: 32px;
  flex: 0 0 auto;
}

.index-link {
  color: var(--blue-soft);
  font-size: 15px;
  transition: color var(--dur) var(--ease);
}

.index-link:hover { color: #FFFFFF; }

.index-link[aria-current="true"] { color: var(--orange); }

/* ---------- 7. 筛选条 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .02);
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 8px 14px;
  color: var(--haze);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.filter-btn:hover {
  color: var(--cream);
  background: rgba(31, 107, 255, .16);
}

.filter-btn[aria-pressed="true"] {
  color: #FFFFFF;
  background: var(--blue);
  border-color: var(--blue);
}

.filter-count {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--haze);
  align-self: center;
  padding-inline: 8px;
}

/* ---------- 8. 卡片 / 标签 / 图片容器 ---------- */
.card {
  position: relative;
  display: block;
  padding: clamp(18px, 2.2vw, 26px);
  background: rgba(255, 255, 255, .02);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: var(--grid-tile) var(--grid-tile);
  transition: opacity var(--dur) var(--ease);
}

.card:hover {
  border-color: var(--orange);
  background: rgba(31, 107, 255, .06);
}

.card:hover::before { opacity: .38; }

.card > * { position: relative; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--haze);
  line-height: 1.6;
}

.tag--blue { color: var(--blue-soft); border-color: rgba(31, 107, 255, .55); }
.tag--orange { color: var(--orange); border-color: rgba(255, 107, 26, .55); }
.tag--amber { color: var(--amber); border-color: rgba(255, 182, 40, .55); }
.tag--mint { color: var(--mint); border-color: rgba(35, 211, 160, .55); }

.figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  background: var(--ink-2);
  overflow: hidden;
}

.figure-media {
  position: relative;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(31, 107, 255, .18), rgba(6, 7, 11, 0) 62%),
    repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 28px),
    var(--ink-2);
  overflow: hidden;
}

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

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

.figure-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--grid);
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--haze);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--haze);
}

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

.breadcrumb li + li::before {
  content: "/";
  color: var(--grid);
}

.breadcrumb a { color: var(--blue-soft); }
.breadcrumb a:hover { color: var(--cream); }

/* ---------- 10. 显现动效协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

[data-reveal-state="shown"] {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 悬浮胶囊页头 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--orange);
  color: #1A0A02;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform .22s var(--ease);
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  padding: 12px 0 0;
  background: transparent;
}

.header-shell {
  position: relative;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.header-island {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 10px 12px 10px 18px;
  border: 1px solid var(--grid);
  border-radius: 999px;
  background: rgba(6, 7, 11, .74);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  transition: padding var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.site-header[data-shrink="true"] .header-island {
  padding: 6px 10px 6px 15px;
  background: rgba(6, 7, 11, .95);
  border-color: #3A5588;
  box-shadow: 0 20px 46px rgba(2, 5, 12, .72);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand-mark {
  position: relative;
  display: block;
  width: 26px;
  height: 26px;
  border-left: 2px solid var(--blue);
  border-bottom: 2px solid var(--blue);
}

.brand-mark-stem {
  position: absolute;
  left: 3px;
  bottom: 3px;
  width: 16px;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--orange));
  transform: skewX(-28deg);
}

.brand-mark-dot {
  position: absolute;
  right: 1px;
  top: 1px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 10px rgba(255, 107, 26, .85);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--cream);
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--haze);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 13px;
  border: 1px solid var(--grid);
  border-radius: 999px;
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.nav-toggle:hover { border-color: var(--blue-soft); }

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle-box span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform .25s var(--ease), opacity .25s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(1) {
  transform: translateY(4.5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(3) {
  transform: translateY(-4.5px) rotate(-45deg);
}

.site-nav {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px 11px;
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--haze);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 5px;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), var(--blue));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .38s var(--ease);
}

.nav-link:hover {
  color: var(--cream);
  background: rgba(31, 107, 255, .12);
}

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

.nav-link[aria-current="page"] {
  color: var(--cream);
  background: rgba(31, 107, 255, .18);
}

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

.nav-link--pulse::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mint);
  flex: 0 0 auto;
  animation: pulse-dot 2.8s ease-out infinite;
}

@keyframes pulse-dot {
  0%   { box-shadow: 0 0 0 0 rgba(35, 211, 160, .55); }
  70%  { box-shadow: 0 0 0 9px rgba(35, 211, 160, 0); }
  100% { box-shadow: 0 0 0 0 rgba(35, 211, 160, 0); }
}

.header-actions {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

.scroll-progress {
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: -9px;
  height: 2px;
  background: rgba(43, 58, 85, .55);
  overflow: hidden;
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--blue), var(--orange));
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--ink);
  border-top: 1px solid var(--grid);
  color: var(--haze);
  font-size: 14.5px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue) 0%, var(--orange) 55%, var(--mint) 100%);
  opacity: .92;
}

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(40px, 5vw, 72px) var(--gutter) 30px;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--grid);
  margin-bottom: clamp(28px, 4vw, 48px);
}

.brand--footer .brand-name { font-size: 18px; }

.footer-lead {
  max-width: 34ch;
  color: var(--haze);
  font-size: 14.5px;
  line-height: 1.7;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.05fr 1.35fr .85fr 1.3fr;
  gap: clamp(20px, 3vw, 48px);
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--grid);
}

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cream);
}

.footer-list {
  display: grid;
  gap: 9px;
}

.footer-link {
  display: inline-block;
  color: var(--haze);
  font-size: 14px;
  line-height: 1.6;
  transition: color var(--dur) var(--ease);
}

.footer-link::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 1px;
  margin-right: 9px;
  vertical-align: middle;
  background: var(--grid);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.footer-link:hover { color: var(--blue-soft); }

.footer-link:hover::before {
  width: 15px;
  background: var(--orange);
}

.contact-list { display: grid; gap: 12px; }

.contact-row { display: grid; gap: 2px; }

.contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange);
}

.contact-val {
  color: var(--cream);
  font-size: 14px;
  line-height: 1.65;
  word-break: break-word;
}

.contact-note {
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.75;
  color: #7C8CA6;
  max-width: 40ch;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--haze);
}

.footer-version {
  margin-left: auto;
  color: #6E7E96;
}

/* ---------- 13. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  background: rgba(6, 7, 11, .94);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s var(--ease), transform .25s var(--ease),
    visibility .25s linear, border-color .25s var(--ease), color .25s var(--ease);
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  border-color: var(--orange);
  color: var(--orange);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1200px) {
  .nav-link { padding: 9px 10px 11px; font-size: 14px; }
  .nav-link::after { left: 10px; right: 10px; }
}

@media (max-width: 1080px) {
  :root {
    --header-space: 86px;
    --gutter: 20px;
  }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: block;
    padding: 10px;
    border: 1px solid var(--grid);
    border-radius: 14px;
    background: rgba(6, 7, 11, .98);
    box-shadow: 0 28px 60px rgba(2, 5, 12, .75);
    max-height: min(74vh, 560px);
    overflow: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .24s var(--ease), transform .24s var(--ease),
      visibility .24s linear;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    justify-content: flex-start;
    padding: 13px 15px;
    border-radius: 8px;
    font-size: 16px;
  }

  .nav-link::after {
    left: 15px;
    right: auto;
    bottom: 8px;
    width: 28px;
  }

  .grid > [class^="col-"] { grid-column: span 12; }

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

@media (max-width: 900px) {
  .col-3, .col-4, .col-6, .col-8, .col-9 { grid-column: span 12; }
  .section-note { margin-left: 0; flex-basis: 100%; }
}

@media (max-width: 640px) {
  :root {
    --header-space: 78px;
    --gutter: 16px;
    --grid-tile: 18px;
  }

  body { font-size: 16px; }

  .header-island { gap: 12px; padding: 8px 10px 8px 14px; }

  .brand-tagline { display: none; }

  .brand-name { font-size: 15.5px; }

  .header-actions .btn-compact {
    padding: 8px 13px;
    font-size: 12.5px;
  }

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

  .footer-version { margin-left: 0; }

  .to-top { right: 14px; bottom: 14px; padding: 10px 14px; }

  .footer-inner { padding-bottom: 76px; }
}

@media (max-width: 400px) {
  .nav-toggle-text { display: none; }
  .header-actions .btn-compact { padding: 8px 11px; }
}

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

  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .scroll-progress-bar { transition: none; }
}