/* ============================================================
   乐天棋牌 · 共享样式表  /assets/site.css
   设计语言：技术蓝图网格 · 侧边轨道导航 · 粗野主义牌桌质感
   ============================================================ */

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

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

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

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

button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }

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

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

/* ---------- 02 设计变量 ---------- */
:root {
  --c-ink: #10163A;
  --c-deep: #0A0E28;
  --c-mid: #1B2450;
  --c-line: #2E3A72;
  --c-gold: #D8A64A;
  --c-gold-lt: #F0D9A0;
  --c-red: #C2402F;
  --c-purple: #6E4B8E;
  --c-text: #EDEFF7;
  --c-muted: #9AA3C7;

  --grad-dusk: linear-gradient(160deg, #10163A 0%, #1B2450 55%, #3A2B5E 100%);
  --grad-gold: linear-gradient(150deg, #F0D9A0 0%, #D8A64A 100%);

  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --rail-w: 19rem;
  --bar-h: 3.6rem;
  --page-max: 74rem;
  --gap: clamp(1rem, 2.2vw, 1.75rem);
  --ease: cubic-bezier(.2, .7, .3, 1);
  --shadow-hard: 6px 6px 0 rgba(10, 14, 40, .55);
  --shadow-hard-lg: 8px 8px 0 rgba(10, 14, 40, .78);
}

/* ---------- 03 基础排版 ---------- */
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--c-ink);
  scroll-padding-top: calc(var(--bar-h) + 1rem);
}
@media (min-width: 1024px) { html { scroll-padding-top: 2rem; } }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  font-family: var(--font-body);
  font-size: clamp(16px, .55vw + 14px, 17.5px);
  line-height: 1.85;
  color: var(--c-text);
  background-color: var(--c-ink);
  background-image:
    linear-gradient(to right, rgba(46, 58, 114, .16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 58, 114, .16) 1px, transparent 1px);
  background-size: 72px 72px;
  min-height: 100vh;
  padding-top: var(--bar-h);
  -webkit-font-smoothing: antialiased;
}

@media (min-width: 1024px) {
  body { padding-top: 0; padding-left: var(--rail-w); }
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  color: var(--c-text);
}

h1, .h1 {
  font-size: clamp(1.75rem, 1.05rem + 2.6vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -.025em;
}
h2, .h2 {
  font-size: clamp(1.375rem, 1.05rem + 1.2vw, 2.125rem);
  line-height: 1.18;
  letter-spacing: -.02em;
}
h3, .h3 {
  font-size: clamp(1.0625rem, 1rem + .3vw, 1.25rem);
  line-height: 1.35;
  letter-spacing: -.012em;
}

p { max-width: 68ch; }
strong, b { font-weight: 700; color: #fff; }
code, kbd, samp { font-family: var(--font-mono); font-size: .9em; letter-spacing: .02em; }

::selection { background: var(--c-gold); color: #10163A; }

:focus-visible {
  outline: 2px solid var(--c-gold-lt);
  outline-offset: 2px;
}

main { display: block; min-height: 55vh; }

/* ---------- 04 通用工具 ---------- */
.container {
  width: min(100% - 2rem, var(--page-max));
  margin-inline: auto;
}
@media (min-width: 1024px) {
  .container { width: min(100% - 3.5rem, var(--page-max)); }
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: .65rem; left: .75rem;
  z-index: 200;
  transform: translateY(-220%);
  padding: .55rem 1rem;
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: #10163A;
  background: var(--c-gold);
  border: 2px solid #10163A;
  transition: transform .16s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.divider {
  height: 2px;
  border: 0;
  background: var(--c-line);
  margin-block: clamp(1.5rem, 3vw, 2.5rem);
}

/* ---------- 05 区块与标题 ---------- */
.section { padding-block: clamp(2.25rem, 5vw, 4rem); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: .75rem 1.5rem;
  padding-bottom: .9rem;
  border-bottom: 2px solid var(--c-line);
  margin-bottom: clamp(1.25rem, 2.6vw, 1.9rem);
}

.section__suffix {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--c-muted);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--c-gold);
}
.eyebrow::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: currentColor;
}

/* ---------- 06 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .68rem 1.05rem;
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-align: center;
  color: var(--c-text);
  background: transparent;
  border: 2px solid var(--c-line);
  transition:
    color .14s var(--ease),
    background-color .14s var(--ease),
    border-color .14s var(--ease),
    box-shadow .14s var(--ease),
    transform .14s var(--ease);
}
.btn:hover {
  color: var(--c-gold-lt);
  border-color: var(--c-gold);
  box-shadow: var(--shadow-hard);
  transform: translateY(-2px);
}
.btn:active { transform: translateY(0); box-shadow: none; }

.btn--gold {
  color: #10163A;
  background: var(--grad-gold);
  border-color: var(--c-gold);
}
.btn--gold:hover {
  color: #0A0E28;
  background: var(--c-gold-lt);
  border-color: var(--c-gold-lt);
}

.btn--ghost { background: rgba(27, 36, 80, .6); }

/* ---------- 07 面包屑 / 文字链接 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .6rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--c-muted);
}
.crumbs li { display: flex; align-items: center; gap: .6rem; }
.crumbs li + li::before { content: "/"; color: var(--c-line); }
.crumbs a { transition: color .14s var(--ease); }
.crumbs a:hover { color: var(--c-gold); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-size: .875rem;
  font-weight: 700;
  color: var(--c-gold);
  border-bottom: 2px solid rgba(216, 166, 74, .35);
  transition: color .14s var(--ease), border-color .14s var(--ease), gap .14s var(--ease);
}
.link-arrow::after { content: "\2192"; font-family: var(--font-mono); }
.link-arrow:hover { color: var(--c-gold-lt); border-bottom-color: var(--c-gold-lt); gap: .75rem; }

/* ---------- 08 栅格 / 卡片 / 面板 ---------- */
.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(13.5rem, 1fr)); }

.card {
  position: relative;
  padding: clamp(1.05rem, 2.2vw, 1.5rem);
  background: var(--c-mid);
  border: 2px solid var(--c-line);
  box-shadow: var(--shadow-hard);
  transition:
    transform .14s var(--ease),
    border-color .14s var(--ease),
    box-shadow .14s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--c-gold);
  box-shadow: var(--shadow-hard-lg);
}

.panel {
  padding: clamp(1.05rem, 2.4vw, 1.6rem);
  background: var(--c-mid);
  border: 2px solid var(--c-line);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .18rem .55rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--c-muted);
  border: 1px solid var(--c-line);
}
.tag--gold { color: var(--c-gold); border-color: var(--c-gold); }
.tag--red { color: #E4837A; border-color: var(--c-red); }
.tag--purple { color: #BFA3D8; border-color: var(--c-purple); }

.num {
  font-family: var(--font-mono);
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 09 长文排版 ---------- */
.prose { max-width: 68ch; line-height: 1.9; }
.prose > * + * { margin-top: 1.15em; }
.prose h2 { margin-top: 1.9em; letter-spacing: -.02em; }
.prose h3 { margin-top: 1.5em; }
.prose ul,
.prose ol { display: flex; flex-direction: column; gap: .5rem; }
.prose ul li,
.prose ol li { position: relative; padding-left: 1.15rem; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0; top: .78em;
  width: .5rem; height: 2px;
  background: var(--c-gold);
}
.prose ol { counter-reset: prose-ol; }
.prose ol li::before {
  counter-increment: prose-ol;
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--c-gold);
}
.prose blockquote {
  border-left: 2px solid var(--c-gold);
  padding-left: 1rem;
  color: var(--c-muted);
}

/* ---------- 10 图片容器（页面阶段放置 img） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: var(--grad-dusk);
  border: 2px solid var(--c-line);
}
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 14, 40, 0) 52%, rgba(10, 14, 40, .78) 100%);
  pointer-events: none;
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }

.media--empty {
  display: grid;
  place-items: center;
  min-height: 9rem;
  background-color: var(--c-mid);
  background-image:
    linear-gradient(to right, rgba(46, 58, 114, .34) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 58, 114, .34) 1px, transparent 1px);
  background-size: 28px 28px;
  box-shadow: none;
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  text-align: center;
  padding: 1rem;
}
.media--empty::after { display: none; }

/* ---------- 11 页头 / 侧边轨道导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 80;
  height: var(--bar-h);
}
@media (min-width: 1024px) {
  .site-header {
    right: auto;
    bottom: 0;
    width: var(--rail-w);
    height: auto;
  }
}

/* 移动端顶条 */
.mobilebar {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  gap: .7rem;
  padding-inline: .9rem;
  background: var(--c-deep);
  border-bottom: 2px solid var(--c-line);
}
@media (min-width: 1024px) { .mobilebar { display: none; } }

.mobilebar__brand {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -.01em;
  white-space: nowrap;
}
.mobilebar__brand::before {
  content: "";
  width: .55rem;
  height: .55rem;
  background: var(--grad-gold);
  box-shadow: 0 0 0 2px rgba(216, 166, 74, .22);
}

.mobilebar__quick {
  margin-left: auto;
  padding: .28rem .55rem;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .05em;
  white-space: nowrap;
  color: var(--c-gold-lt);
  border: 1px solid rgba(216, 166, 74, .55);
  transition: color .14s var(--ease), border-color .14s var(--ease), background-color .14s var(--ease);
}
.mobilebar__quick:hover,
.mobilebar__quick:focus-visible {
  color: #10163A;
  background: var(--c-gold-lt);
  border-color: var(--c-gold-lt);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 2.5rem;
  height: 2.5rem;
  color: var(--c-text);
  border: 2px solid var(--c-line);
  transition: border-color .14s var(--ease), color .14s var(--ease);
}
.nav-toggle:hover,
.nav-toggle:focus-visible { border-color: var(--c-gold); color: var(--c-gold-lt); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 1.125rem;
  height: 2px;
  background: currentColor;
  transition: background-color .18s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: top .18s var(--ease), transform .18s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

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

@media (min-width: 1024px) { .nav-toggle { display: none; } }

/* 轨道本体 */
.rail {
  position: fixed;
  top: var(--bar-h);
  bottom: 0;
  left: 0;
  z-index: 75;
  width: min(86vw, 20rem);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--c-deep);
  border-right: 2px solid var(--c-line);
  border-bottom: 2px solid var(--c-line);
  transform: translateX(-101%);
  transition: transform .24s var(--ease);
}
.site-header[data-open="true"] .rail {
  transform: translateX(0);
  box-shadow: 0 0 0 100vmax rgba(10, 14, 40, .68);
}

@media (min-width: 1024px) {
  .rail {
    top: 0;
    bottom: 0;
    width: var(--rail-w);
    transform: none;
    box-shadow: none;
    border-bottom: 0;
    z-index: 1;
  }
}

.rail__inner {
  display: flex;
  flex-direction: column;
  gap: 1.05rem;
  min-height: 100%;
  padding: 1.35rem 1.1rem 1.5rem;
}
@media (max-width: 1023px) {
  .rail__inner { padding: 1.5rem 1.15rem 2rem; }
}

.rail__brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--c-line);
}
.rail__mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.25rem;
  color: #10163A;
  background: var(--grad-gold);
  box-shadow: 3px 3px 0 rgba(10, 14, 40, .9);
}
.rail__brandtext { display: flex; flex-direction: column; min-width: 0; }
.rail__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: -.02em;
}
.rail__note {
  font-size: .6875rem;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--c-muted);
  max-width: none;
}

.rail__tagline {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--c-gold);
  max-width: none;
}

.rail__nav { display: block; }
.rail__list { display: flex; flex-direction: column; gap: 2px; }

.rail__link {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  padding: .55rem .6rem;
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--c-muted);
  border-left: 2px solid transparent;
  transition:
    color .14s var(--ease),
    background-color .14s var(--ease),
    border-color .14s var(--ease),
    transform .14s var(--ease);
}
.rail__link:hover,
.rail__link:focus-visible {
  color: var(--c-text);
  background: rgba(27, 36, 80, .8);
  border-left-color: var(--c-gold);
  transform: translateX(2px);
}
.rail__link[aria-current="page"] {
  color: var(--c-gold-lt);
  background: rgba(27, 36, 80, .95);
  border-left-color: var(--c-gold-lt);
}
.rail__link[aria-current="page"] .rail__idx { color: var(--c-gold); }

.rail__idx {
  min-width: 1.5rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .08em;
  color: rgba(154, 163, 199, .65);
}

.rail__actions {
  display: grid;
  gap: .55rem;
  margin-top: auto;
  padding-top: 1.15rem;
  border-top: 2px solid var(--c-line);
}
@media (max-width: 1023px) {
  .rail__actions { margin-top: 1.35rem; }
}

/* 阅读进度条 */
.scroll-progress {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  z-index: 90;
  background: rgba(46, 58, 114, .5);
  pointer-events: none;
}
@media (min-width: 1024px) { .scroll-progress { left: var(--rail-w); } }

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-purple) 0%, var(--c-gold) 58%, var(--c-gold-lt) 100%);
  transition: width .12s linear;
}

html.nav-open,
html.nav-open body { overflow: hidden; }

/* ---------- 12 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 5.5rem);
  background: var(--c-deep);
  border-top: 2px solid var(--c-line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--c-line) 0 2px, transparent 2px 28px);
  opacity: .8;
  pointer-events: none;
}

.footer__inner {
  width: min(100% - 2rem, var(--page-max));
  margin-inline: auto;
  padding: clamp(2.25rem, 5vw, 3.25rem) 0 1.5rem;
}
@media (min-width: 1024px) {
  .footer__inner { width: min(100% - 3.5rem, var(--page-max)); }
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem 1.75rem;
}
@media (min-width: 600px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1.5fr .9fr .9fr 1.3fr;
    gap: 2.5rem;
  }
}

.footer__brand { display: flex; flex-direction: column; gap: .65rem; }

.footer__mark {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -.02em;
  color: var(--c-text);
}
.footer__mark::before {
  content: "";
  width: .7rem;
  height: .7rem;
  background: var(--grad-gold);
  box-shadow: 2px 2px 0 rgba(216, 166, 74, .22);
}

.footer__line {
  font-size: .8125rem;
  line-height: 1.8;
  color: var(--c-muted);
  max-width: 30ch;
}

.footer__col { display: block; }

.footer__title {
  display: block;
  margin-bottom: .9rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--c-gold);
}

.footer__list { display: flex; flex-direction: column; gap: .55rem; }

.footer__link {
  display: inline-block;
  font-size: .875rem;
  color: var(--c-muted);
  border-bottom: 1px solid transparent;
  transition:
    color .14s var(--ease),
    border-color .14s var(--ease),
    transform .14s var(--ease);
}
.footer__link:hover,
.footer__link:focus-visible {
  color: var(--c-gold-lt);
  border-bottom-color: var(--c-gold);
  transform: translateX(2px);
}

.footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  font-size: .875rem;
  color: var(--c-muted);
}
.footer__contact-list li {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  line-height: 1.7;
}
.footer__key {
  flex: 0 0 auto;
  min-width: 2.6rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .08em;
  color: var(--c-gold);
}
.footer__val {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .03em;
  color: var(--c-text);
  word-break: break-all;
}

.footer__note {
  margin-top: 1rem;
  max-width: 38ch;
  padding-left: .7rem;
  border-left: 2px solid var(--c-purple);
  font-size: .75rem;
  line-height: 1.8;
  color: var(--c-muted);
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  margin-top: 2.25rem;
  padding-top: 1.25rem;
  border-top: 2px solid var(--c-line);
  font-size: .75rem;
  line-height: 1.8;
  color: var(--c-muted);
}
.footer__base p { max-width: none; }
.footer__fine { flex: 1 1 18rem; }
.footer__icp { font-family: var(--font-mono); letter-spacing: .06em; }
.footer__copy { font-family: var(--font-mono); letter-spacing: .06em; }

/* ---------- 13 响应式收尾 ---------- */
@media (max-width: 599px) {
  .section__head { align-items: flex-start; }
  .footer__base { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover { transform: none; }
  .btn:hover { transform: none; }
  .rail__link:hover,
  .rail__link:focus-visible { transform: none; }
  .footer__link:hover,
  .footer__link:focus-visible { transform: none; }
}