/* ============================================================
   盛大棋牌 · 索引牌桌 共享样式 /assets/site.css
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 104px; }
body, h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, picture, video { max-width: 100%; }
button { font: inherit; }

:root {
  --sd-ink: #0B2E27;
  --sd-ink-2: #12453A;
  --sd-ink-3: #1B5B4B;
  --sd-gold: #C9A227;
  --sd-gold-soft: #E6C76A;
  --sd-red: #C94A32;
  --sd-red-soft: #E98A73;
  --sd-cream: #F6F0E2;
  --sd-teal: #3F8C80;
  --sd-charcoal: #0F1714;
  --sd-sand: #D8C7A3;

  --sd-gold-line: rgba(201, 162, 39, 0.30);
  --sd-gold-line-2: rgba(201, 162, 39, 0.14);
  --sd-cream-dim: rgba(246, 240, 226, 0.74);
  --sd-cream-faint: rgba(246, 240, 226, 0.50);

  --sd-font-display: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --sd-font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --sd-shell: 1240px;
  --sd-pad: clamp(20px, 4.5vw, 56px);
  --sd-radius-l: 28px;
  --sd-radius-m: 18px;
  --sd-radius-s: 12px;
  --sd-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --sd-head-h: 86px;
}

body {
  min-height: 100vh;
  background: var(--sd-ink);
  color: var(--sd-cream);
  font-family: var(--sd-font-display);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }
b, strong { font-weight: 800; }

:focus-visible {
  outline: 2px solid var(--sd-gold-soft);
  outline-offset: 3px;
  border-radius: 6px;
}

.sd-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;
}

/* ---------- 跳过导航 ---------- */
.sd-skip {
  position: fixed;
  top: 10px; left: 10px;
  z-index: 300;
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  background: var(--sd-gold);
  color: var(--sd-ink);
  font-size: 14px; font-weight: 800; letter-spacing: 0.04em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.26s var(--sd-ease);
}
.sd-skip:focus { transform: translateY(0); outline: 3px solid var(--sd-cream); outline-offset: 2px; }

/* ---------- 页头（框架式导航） ---------- */
.sd-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(11, 46, 39, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--sd-gold-line);
  box-shadow: 0 20px 44px -34px rgba(0, 0, 0, 0.9);
}

.sd-progress {
  position: absolute;
  left: 0; bottom: -1px;
  height: 2px; width: 0;
  background: linear-gradient(90deg, var(--sd-gold), var(--sd-red));
  transition: width 0.12s linear;
  z-index: 3;
}

.sd-header__inner {
  width: 100%;
  max-width: var(--sd-shell);
  margin-inline: auto;
  padding-inline: var(--sd-pad);
  min-height: var(--sd-head-h);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 34px);
  transition: min-height 0.3s var(--sd-ease);
}
.sd-header.is-compact .sd-header__inner { min-height: 64px; }

/* 品牌 */
.sd-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--sd-cream);
}
.sd-brand__mark {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 3px;
  width: 26px; height: 26px;
  transition: transform 0.4s var(--sd-ease);
}
.sd-brand:hover .sd-brand__mark { transform: rotate(90deg); }
.sd-brand__mark span { display: block; border-radius: 2px; background: var(--sd-gold); }
.sd-brand__mark span:nth-child(2),
.sd-brand__mark span:nth-child(3) { background: transparent; border: 1.5px solid var(--sd-gold); }
.sd-brand__mark span:nth-child(4) { background: var(--sd-red); }

.sd-brand__text { display: flex; flex-direction: column; line-height: 1.16; }
.sd-brand__text b { font-size: 17px; font-weight: 900; letter-spacing: 0.07em; }
.sd-brand__text i {
  font-style: normal;
  font-family: var(--sd-font-mono);
  font-size: 10.5px;
  letter-spacing: 0.30em;
  color: var(--sd-gold-soft);
}

/* 导航 */
.sd-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}
.sd-nav__list { display: flex; align-items: center; gap: 2px; }
.sd-nav__item { display: block; }
.sd-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 12px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--sd-cream-dim);
  text-decoration: none;
  transition: color 0.2s var(--sd-ease);
}
.sd-nav__link::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 3px;
  height: 2px; border-radius: 2px;
  background: var(--sd-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--sd-ease);
}
.sd-nav__link:hover { color: var(--sd-cream); }
.sd-nav__link:hover::after { transform: scaleX(1); }
.sd-nav__link[aria-current="page"] { color: var(--sd-gold-soft); font-weight: 800; }
.sd-nav__link[aria-current="page"]::after { transform: scaleX(1); background: var(--sd-gold-soft); }

.sd-nav__more { display: none; }
.sd-header__actions { display: flex; align-items: center; gap: 10px; margin-left: 6px; }

/* 按钮 */
.sd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s var(--sd-ease), background 0.2s, border-color 0.2s, color 0.2s;
}
.sd-btn--gold { background: var(--sd-gold); color: var(--sd-ink); }
.sd-btn--gold:hover { background: var(--sd-gold-soft); transform: translateY(-2px); }
.sd-btn--ghost {
  background: transparent;
  border-color: var(--sd-gold-line);
  color: var(--sd-gold-soft);
}
.sd-btn--ghost:hover {
  border-color: var(--sd-gold-soft);
  background: rgba(201, 162, 39, 0.12);
  transform: translateY(-2px);
}
.sd-btn--sm { min-height: 38px; padding: 0 16px; font-size: 13px; }

/* 移动导航按钮 */
.sd-nav-toggle {
  display: none;
  width: 46px; height: 46px;
  padding: 0;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--sd-gold-line);
  border-radius: 14px;
  background: rgba(201, 162, 39, 0.08);
  color: var(--sd-gold-soft);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.sd-nav-toggle:hover { background: rgba(201, 162, 39, 0.18); border-color: var(--sd-gold-soft); }
.sd-nav-toggle__bars { display: grid; gap: 5px; width: 20px; }
.sd-nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.3s var(--sd-ease), opacity 0.2s;
}

/* ---------- 页脚（牌桌边缘） ---------- */
.sd-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 132px);
  background: var(--sd-ink-2);
  border-top: 1px solid var(--sd-gold-line);
  color: var(--sd-cream);
  overflow: hidden;
}
.sd-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(620px 300px at 10% 0%, rgba(201, 162, 39, 0.12), transparent 72%),
    radial-gradient(540px 300px at 92% 104%, rgba(63, 140, 128, 0.16), transparent 72%);
}
.sd-footer__inner {
  position: relative;
  max-width: var(--sd-shell);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 72px) var(--sd-pad) clamp(22px, 3vw, 34px);
}
.sd-footer__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  flex-wrap: wrap;
  padding-bottom: clamp(22px, 3vw, 34px);
  border-bottom: 1px solid var(--sd-gold-line-2);
}
.sd-footer__brand {
  font-size: clamp(20px, 2.8vw, 30px);
  font-weight: 900;
  line-height: 1.32;
  letter-spacing: 0.01em;
}
.sd-footer__brand-cn { color: var(--sd-cream); }
.sd-footer__brand-dot {
  color: var(--sd-gold);
  font-size: 0.62em;
  vertical-align: 0.18em;
  padding: 0 0.55em;
}
.sd-footer__brand-line {
  font-size: 0.66em;
  font-weight: 500;
  color: var(--sd-sand);
  letter-spacing: 0.03em;
}

.sd-footer__grid {
  display: grid;
  grid-template-columns: 1.55fr 1fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  padding: clamp(28px, 4vw, 46px) 0;
}
.sd-footer__col { min-width: 0; }
.sd-footer__title {
  font-family: var(--sd-font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--sd-gold-soft);
  margin-bottom: 16px;
}
.sd-footer__list { display: grid; gap: 10px; font-size: 14.5px; }
.sd-footer__list li { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.sd-footer__list--links li { display: block; }
.sd-footer__k {
  flex: 0 0 auto;
  font-family: var(--sd-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--sd-teal);
}
.sd-footer__v {
  color: var(--sd-cream-dim);
  overflow-wrap: anywhere;
  word-break: break-word;
}
.sd-footer__note {
  margin-top: 14px;
  max-width: 44ch;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--sd-cream-faint);
}
.sd-footer__link {
  color: var(--sd-cream-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.sd-footer__link:hover { color: var(--sd-gold-soft); border-bottom-color: var(--sd-gold-line); }

.sd-footer__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding-top: clamp(16px, 2.4vw, 26px);
  border-top: 1px solid var(--sd-gold-line-2);
  font-family: var(--sd-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sd-cream-faint);
}
.sd-footer__copy { margin: 0; }
.sd-footer__icp { margin: 0; }

/* ---------- 返回顶部（JS 注入） ---------- */
.sd-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  padding: 0;
  border: none;
  border-radius: 16px;
  background: var(--sd-gold);
  color: var(--sd-ink);
  font-family: var(--sd-font-mono);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 14px 30px -14px rgba(0, 0, 0, 0.8);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.28s var(--sd-ease), transform 0.28s var(--sd-ease), visibility 0.28s, background 0.2s;
}
.sd-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.sd-top:hover { background: var(--sd-gold-soft); }

/* ---------- 通用内容组件 ---------- */
.sd-container {
  width: 100%;
  max-width: var(--sd-shell);
  margin-inline: auto;
  padding-inline: var(--sd-pad);
}
.sd-section { padding-block: clamp(48px, 7vw, 104px); }

.sd-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--sd-font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.26em;
  color: var(--sd-gold-soft);
}
.sd-eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: var(--sd-gold);
}

.sd-h2 {
  font-size: clamp(30px, 4vw, 56px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--sd-cream);
}
.sd-h3 {
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 800;
  line-height: 1.32;
  color: var(--sd-cream);
}
.sd-lede {
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--sd-cream-dim);
}
.sd-mono {
  font-family: var(--sd-font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--sd-gold-soft);
}
.sd-rule {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 48px);
  background: var(--sd-gold-line-2);
}

.sd-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--sd-gold-line);
  border-radius: 999px;
  background: rgba(201, 162, 39, 0.12);
  color: var(--sd-gold-soft);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.sd-tag--red {
  background: rgba(201, 74, 50, 0.18);
  border-color: rgba(201, 74, 50, 0.42);
  color: var(--sd-red-soft);
}

.sd-grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.sd-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.sd-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.sd-card {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  border: 1px solid var(--sd-gold-line-2);
  border-radius: var(--sd-radius-l);
  background: var(--sd-ink-2);
  overflow: hidden;
  transition: transform 0.3s var(--sd-ease), border-color 0.3s, background 0.3s;
}
.sd-card:hover { transform: translateY(-3px); border-color: var(--sd-gold-line); background: var(--sd-ink-3); }
.sd-card--cut {
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

/* 图片容器基础规则（页面阶段放图） */
.sd-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--sd-gold-line-2);
  border-radius: var(--sd-radius-l);
  background:
    repeating-linear-gradient(135deg, rgba(201, 162, 39, 0.09) 0 1px, transparent 1px 13px),
    linear-gradient(155deg, var(--sd-ink-3), var(--sd-ink));
}
.sd-media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--sd-ease);
}
.sd-media:hover .sd-media__img { transform: scale(1.03); }
.sd-media--wide { aspect-ratio: 21 / 9; }
.sd-media--tall { aspect-ratio: 3 / 4; }
.sd-media--square { aspect-ratio: 1 / 1; }
.sd-media--cut {
  border-radius: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

/* 面包屑 */
.sd-crumbs { padding-top: clamp(18px, 2.4vw, 28px); }
.sd-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--sd-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sd-cream-faint);
}
.sd-crumbs__list li { display: inline-flex; align-items: center; gap: 8px; }
.sd-crumbs__list li + li::before { content: "/"; color: var(--sd-gold-line); }
.sd-crumbs__list a { color: var(--sd-cream-dim); text-decoration: none; }
.sd-crumbs__list a:hover { color: var(--sd-gold-soft); }
.sd-crumbs__list [aria-current="page"] { color: var(--sd-gold-soft); }

/* ---------- 响应式 ---------- */
@media (max-width: 1160px) {
  .sd-nav__link { padding: 10px 9px; font-size: 14px; }
  .sd-nav__link::after { left: 9px; right: 9px; }
}

@media (max-width: 1080px) {
  :root { --sd-head-h: 72px; }
  html { scroll-padding-top: 88px; }

  .sd-nav-toggle { display: inline-flex; }
  .sd-header__cta { display: none; }
  .sd-header__actions { margin-left: auto; }

  .sd-nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 85;
    display: block;
    margin: 0;
    max-height: 100dvh;
    overflow-y: auto;
    padding: calc(var(--sd-head-h) + 26px) var(--sd-pad) 32px;
    background: var(--sd-ink-2);
    border-bottom: 1px solid var(--sd-gold-line);
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.9);
    transform: translateY(-102%);
    visibility: hidden;
    transition: transform 0.4s var(--sd-ease), visibility 0.4s;
  }
  .sd-header[data-open] .sd-nav { transform: translateY(0); visibility: visible; }

  .sd-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .sd-nav__item { border-bottom: 1px solid var(--sd-gold-line-2); }
  .sd-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 56px;
    padding: 14px 4px;
    border-radius: 0;
    font-size: 17px;
    font-weight: 600;
    color: var(--sd-cream);
  }
  .sd-nav__link::after { display: none; }
  .sd-nav__link:hover { color: var(--sd-gold-soft); }
  .sd-nav__link[aria-current="page"] { color: var(--sd-gold-soft); }
  .sd-nav__link[aria-current="page"]::before {
    content: "";
    width: 8px; height: 8px;
    border-radius: 2px;
    background: var(--sd-red);
    order: 1;
    margin-left: auto;
  }

  .sd-nav__more { display: grid; gap: 12px; margin-top: 24px; }
  .sd-nav__more .sd-btn { width: 100%; }

  .sd-header[data-open] .sd-nav-toggle { background: rgba(201, 162, 39, 0.22); border-color: var(--sd-gold-soft); }
  .sd-header[data-open] .sd-nav-toggle__bars i:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .sd-header[data-open] .sd-nav-toggle__bars i:nth-child(2) { opacity: 0; }
  .sd-header[data-open] .sd-nav-toggle__bars i:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  body.sd-nav-open { overflow: hidden; }

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

@media (max-width: 900px) {
  .sd-footer__grid { grid-template-columns: 1fr 1fr; }
  .sd-footer__col--wide { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .sd-brand__text b { font-size: 16px; }
  .sd-footer__grid { grid-template-columns: 1fr; }
  .sd-footer__top { flex-direction: column; align-items: flex-start; }
  .sd-footer__top .sd-btn { width: 100%; }
  .sd-footer__meta { flex-direction: column; align-items: flex-start; gap: 6px; }
  .sd-btn { min-height: 44px; padding: 0 18px; }
}

@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;
    transition-delay: 0ms !important;
  }
  .sd-brand:hover .sd-brand__mark { transform: none; }
  .sd-card:hover, .sd-btn:hover, .sd-top:hover { transform: none; }
  .sd-media:hover .sd-media__img { transform: none; }
}