/* ==========================================================================
   9棋牌主站 · 共享样式表 /assets/site.css
   结构：reset → 变量 → 排版 → 外壳（刊头/导航/页脚）→ 组件 → 响应式
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #0B0F0E;
}

body {
  margin: 0;
  background: #0B0F0E;
  color: #FBF7EF;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

button { font: inherit; color: inherit; }

ul,
ol { margin: 0; padding: 0; }

h1,
h2,
h3,
h4,
h5,
h6 { margin: 0 0 .55em; font-weight: 900; line-height: 1.24; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: #E0A94A; text-decoration: none; }

hr { border: 0; }

::selection { background: #E0A94A; color: #0B0F0E; }

:focus-visible {
  outline: 2px solid #E0A94A;
  outline-offset: 3px;
}

/* ---------- 变量 ---------- */
:root {
  --obsidian: #0B0F0E;
  --ink: #10261F;
  --felt: #17453A;
  --felt-line: #1F5E4E;
  --amber: #E0A94A;
  --amber-dim: #A87A2C;
  --jade: #4FBFA6;
  --paper: #F2EBDD;
  --white: #FBF7EF;
  --mist: #9AA5A0;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-cond: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Sarasa Mono SC", "SFMono-Regular", Consolas, monospace;

  --wrap: 1180px;
  --gutter: clamp(18px, 4vw, 48px);
  --cut: 16px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 通用容器 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.container--narrow { max-width: 840px; }

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

#main-content { display: block; }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: 50%;
  top: 0;
  transform: translate(-50%, -140%);
  z-index: 140;
  padding: 10px 20px;
  background: var(--amber);
  color: var(--obsidian);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  transition: transform .18s var(--ease);
}

.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 刊头 ---------- */
.site-header {
  position: relative;
  background: var(--obsidian);
  border-bottom: 1px solid rgba(31, 94, 78, .55);
}

.masthead {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(20px, 3vw, 34px) var(--gutter) clamp(14px, 2vw, 22px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 16px;
}

.masthead__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--mist);
  text-transform: uppercase;
}

.masthead__brand {
  position: relative;
  justify-self: center;
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1;
  letter-spacing: .08em;
  color: var(--white);
  text-align: center;
  padding-bottom: 10px;
}

.masthead__brand::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 46px;
  height: 2px;
  background: var(--amber);
  transform: translateX(-50%);
}

.masthead__aux {
  justify-self: end;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px 18px;
  max-width: 100%;
}

.masthead__aux-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.masthead__aux-link:hover {
  color: var(--amber);
  border-bottom-color: var(--amber-dim);
}

/* ---------- 吸顶导航条 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(11, 15, 14, .9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(31, 94, 78, .45);
  border-bottom: 1px solid rgba(31, 94, 78, .45);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.navbar[data-stuck] {
  background: rgba(11, 15, 14, .98);
  box-shadow: 0 16px 34px -22px #000;
}

.navbar__inner {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 11px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: padding .22s var(--ease);
}

.navbar[data-stuck] .navbar__inner { padding-top: 5px; padding-bottom: 5px; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--felt-line);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}

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

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 12px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: var(--amber);
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}

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

.nav {
  display: flex;
  align-items: center;
  visibility: visible;
}

.nav__list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: clamp(2px, 1.6vw, 24px);
  list-style: none;
}

.nav__item { display: block; }

.nav__link {
  display: block;
  padding: 8px 10px;
  font-family: var(--font-cond);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .05em;
  color: var(--mist);
  border-bottom: 2px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.nav__link:hover,
.nav__link:focus-visible { color: var(--white); border-bottom-color: var(--amber-dim); }

.nav__link[aria-current="page"] {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- 分区 ---------- */
.section { padding: clamp(52px, 8vw, 108px) 0; }
.section--ink { background: var(--ink); }
.section--felt { background: linear-gradient(180deg, var(--felt) 0%, var(--ink) 100%); }
.section--paper { background: var(--paper); color: var(--ink); }

.section--paper .section-head__title,
.section--paper h2,
.section--paper h3 { color: var(--ink); }

.section--paper .eyebrow { color: var(--amber-dim); }
.section--paper .section-head__lead { color: #4C5B55; }
.section--paper .data-list__val { color: var(--ink); }
.section--paper .data-list__row { border-bottom-color: rgba(16, 38, 31, .22); }
.section--paper .panel { background: rgba(11, 15, 14, .05); box-shadow: inset 0 0 0 1px rgba(16, 38, 31, .18); }

.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--amber);
}

.section-head {
  max-width: 720px;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.section-head__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 3.6vw, 40px);
  letter-spacing: .01em;
  color: var(--white);
}

.section-head__lead {
  margin: 0;
  font-size: 17px;
  color: #C6D1CC;
}

/* ---------- 形状与面板 ---------- */
.cut {
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
}

.panel {
  padding: clamp(20px, 3vw, 34px);
  background: linear-gradient(160deg, rgba(23, 69, 58, .92) 0%, rgba(16, 38, 31, .96) 100%);
  box-shadow: inset 0 0 0 1px rgba(31, 94, 78, .8);
}

.slash-rule {
  display: block;
  height: 1px;
  border: 0;
  background-image: repeating-linear-gradient(90deg, var(--felt-line) 0 10px, transparent 10px 18px);
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  font-family: var(--font-cond);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .05em;
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}

.btn:focus-visible { outline: 2px solid var(--white); outline-offset: -6px; }

.btn--amber { background: var(--amber); color: var(--obsidian); }
.btn--amber:hover { background: #EFBC63; }

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

.btn--jade { background: transparent; color: var(--jade); border-color: var(--jade); }
.btn--jade:hover { background: rgba(79, 191, 166, .14); }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding-top: clamp(16px, 2.4vw, 26px); }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.breadcrumb__item { display: flex; align-items: center; gap: 8px; }
.breadcrumb__item::after { content: "/"; color: var(--felt-line); }
.breadcrumb__item:last-child::after { content: none; }

.breadcrumb__link { color: var(--mist); transition: color .16s var(--ease); }
.breadcrumb__link:hover { color: var(--amber); }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  background: rgba(11, 15, 14, .45);
  border: 1px solid var(--felt-line);
  transition: border-color .16s var(--ease), color .16s var(--ease);
}

.tag--amber { color: var(--amber); border-color: var(--amber-dim); }
.tag--jade { color: var(--jade); border-color: var(--jade); }
.tag--paper { color: var(--ink); background: var(--paper); border-color: transparent; }

/* ---------- 数据列表 ---------- */
.data-list {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 14px;
}

.data-list__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(31, 94, 78, .7);
}

.data-list__key { color: var(--mist); }
.data-list__val { color: var(--white); font-variant-numeric: tabular-nums; }

/* ---------- 指标 ---------- */
.stat { display: block; }

.stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 横向卡组 ---------- */
.rail {
  display: flex;
  gap: clamp(14px, 2vw, 22px);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 6px 0 22px;
  scrollbar-color: var(--amber-dim) transparent;
}

.rail > * {
  flex: 0 0 clamp(220px, 30vw, 300px);
  scroll-snap-align: start;
}

.rail::-webkit-scrollbar { height: 6px; }
.rail::-webkit-scrollbar-track { background: transparent; }
.rail::-webkit-scrollbar-thumb { background: var(--felt-line); }

/* ---------- 展开组 ---------- */
.expand { border-top: 1px solid rgba(31, 94, 78, .6); }

.expand__head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  background: none;
  border: 0;
  text-align: left;
  font-family: var(--font-cond);
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
  cursor: pointer;
  transition: color .16s var(--ease);
}

.expand__head:hover { color: var(--amber); }

.expand__icon {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.expand__icon::before,
.expand__icon::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 14px;
  height: 1.5px;
  background: var(--amber);
  transition: transform .2s var(--ease);
}

.expand__icon::after { transform: rotate(90deg); }
.expand__head[aria-expanded="true"] .expand__icon::after { transform: rotate(0deg); }

.expand__body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .24s var(--ease);
}

.expand__body[data-open] { grid-template-rows: 1fr; }
.expand__inner { overflow: hidden; }
.expand__inner > * { padding-bottom: 18px; }

/* ---------- 图片容器 ---------- */
.media { display: block; }

.media__frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: linear-gradient(150deg, var(--felt) 0%, var(--ink) 100%);
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
}

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

.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

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

/* ---------- 复制反馈 ---------- */
.copy-status {
  display: inline-block;
  margin-left: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--jade);
  opacity: 0;
  transition: opacity .18s var(--ease);
}

.copy-status[data-visible] { opacity: 1; }

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  z-index: 90;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--amber) 0%, var(--jade) 100%);
}

/* ---------- 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

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

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--obsidian);
  border-top: 1px solid var(--felt-line);
  color: var(--mist);
}

.site-footer__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(44px, 6vw, 76px) var(--gutter) clamp(28px, 4vw, 46px);
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.9fr) minmax(0, 1.25fr);
  gap: clamp(24px, 4vw, 56px);
}

.footer-brand__line {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.2vw, 24px);
  letter-spacing: .04em;
  color: var(--white);
}

.footer-brand__note {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.footer-brand__rule { width: 72px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 32px);
}

.footer-col__title,
.footer-contact__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--amber);
}

.footer-col__list { list-style: none; }

.footer-col__list li { margin-bottom: 10px; }

.footer-link {
  font-size: 15px;
  color: var(--mist);
  transition: color .16s var(--ease);
}

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

.footer-contact__list { margin: 0 0 14px; }

.footer-contact__item { margin-bottom: 14px; }

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--felt-line);
  margin-bottom: 4px;
}

.footer-contact__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

.footer-contact__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.site-footer__base {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px var(--gutter) 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  border-top: 1px solid rgba(31, 94, 78, .45);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.footer-base__copy,
.footer-base__icp { margin: 0; }
.footer-base__icp { color: var(--amber-dim); }

/* ---------- 响应式：平板 ---------- */
@media (max-width: 1000px) {
  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    text-align: center;
    gap: 12px;
  }
  .masthead__aux { justify-self: center; justify-content: center; }
  .masthead__eyebrow { text-align: center; }

  .grid--3,
  .grid--asym { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 响应式：移动导航 ---------- */
@media (max-width: 860px) {
  .navbar__inner { justify-content: flex-start; padding-top: 9px; padding-bottom: 9px; }

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

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: var(--ink);
    border-bottom: 1px solid var(--felt-line);
    box-shadow: 0 22px 40px -26px #000;
    transition: max-height .26s var(--ease), visibility 0s linear .26s;
  }

  .nav[data-open] {
    max-height: 76vh;
    overflow-y: auto;
    visibility: visible;
    transition: max-height .26s var(--ease), visibility 0s;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--gutter) 18px;
  }

  .nav__item { width: 100%; }

  .nav__link {
    padding: 15px 4px;
    font-size: 17px;
    border-bottom: 1px solid rgba(31, 94, 78, .5);
  }

  .nav__link[aria-current="page"] { border-bottom-color: var(--amber); }
}

/* ---------- 响应式：手机 ---------- */
@media (max-width: 680px) {
  body { font-size: 16px; }

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

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

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

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

  .btn { width: 100%; }
}

/* ---------- 降低动效 ---------- */
@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 !important;
    transform: none !important;
  }

  .scroll-progress { display: none; }
}