/* ==========================================================
   星欧娱乐 · 星欧平台 —— shell.css
   站点骨架：左侧固定栏目目录 / 移动端抽屉 / 页头 / 页脚
   ========================================================== */

/* ---------------- 左侧栏目目录 ---------------- */

.xo-rail {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 60;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  padding: 28px 22px 22px;
  background: var(--xo-night);
  background-image:
    linear-gradient(180deg, rgba(162, 132, 74, 0.14), transparent 26%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.022) 0 1px, transparent 1px 5px);
  color: rgba(244, 239, 228, 0.72);
  border-right: 1px solid rgba(0, 0, 0, 0.5);
  overflow-y: auto;
}

.xo-brand {
  display: flex;
  gap: 12px;
  align-items: center;
  color: var(--xo-paper);
  border: 0;
  padding-bottom: 20px;
}

.xo-brand:hover {
  color: var(--xo-paper);
}

.xo-brand__seal {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border: 1px solid var(--xo-seal-2);
  border-radius: var(--r-s);
  color: #f0d9cf;
  background: rgba(161, 49, 39, 0.22);
  font-family: var(--f-serif);
  font-size: 0.86rem;
  line-height: 1.05;
  letter-spacing: 0.04em;
  text-align: center;
  writing-mode: vertical-rl;
  text-orientation: upright;
}

.xo-brand__seal--light {
  background: rgba(244, 239, 228, 0.08);
  border-color: rgba(244, 239, 228, 0.3);
  color: var(--xo-paper);
}

.xo-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
}

.xo-brand__text strong {
  font-family: var(--f-serif);
  font-size: 1.06rem;
  letter-spacing: 0.14em;
  color: var(--xo-paper);
}

.xo-brand__text em {
  font-family: var(--f-mono);
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  color: rgba(244, 239, 228, 0.45);
}

.xo-rail__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  border-bottom: 1px solid var(--xo-line-light);
}

.xo-rail__close {
  display: none;
  background: none;
  border: 1px solid var(--xo-line-light);
  border-radius: var(--r-s);
  color: rgba(244, 239, 228, 0.7);
  width: 32px;
  height: 32px;
  line-height: 1;
  font-size: 1.1rem;
}

.xo-nav {
  padding: 24px 0 0;
  flex: 1 1 auto;
}

.xo-nav__title {
  font-family: var(--f-mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: rgba(244, 239, 228, 0.38);
  margin: 0 0 14px;
}

.xo-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.xo-nav__list li {
  margin: 0;
}

.xo-nav__item {
  display: grid;
  grid-template-columns: 26px 1fr;
  align-items: baseline;
  gap: 4px;
  padding: 10px 8px 10px 0;
  border: 0;
  border-left: 2px solid transparent;
  color: rgba(244, 239, 228, 0.68);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.xo-nav__item:hover {
  color: var(--xo-paper);
  padding-left: 6px;
  border-bottom: 0;
}

.xo-nav__num {
  font-family: var(--f-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: rgba(244, 239, 228, 0.32);
}

.xo-nav__label {
  font-family: var(--f-serif);
  font-size: 0.98rem;
  letter-spacing: 0.08em;
}

.xo-nav__desc {
  grid-column: 2;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: rgba(244, 239, 228, 0.3);
}

.xo-nav__item.is-active {
  color: var(--xo-paper);
  border-left-color: var(--xo-seal-2);
  padding-left: 8px;
  background: linear-gradient(90deg, rgba(161, 49, 39, 0.18), transparent 85%);
}

.xo-nav__item.is-active .xo-nav__num {
  color: var(--xo-seal-2);
}

.xo-rail__foot {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--xo-line-light);
  font-size: 0.7rem;
  line-height: 1.7;
}

.xo-rail__slogan {
  font-family: var(--f-serif);
  color: rgba(244, 239, 228, 0.6);
  margin-bottom: 10px;
}

.xo-rail__meta {
  font-family: var(--f-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: rgba(244, 239, 228, 0.34);
  margin: 0;
}

/* ---------------- 主内容区 ---------------- */

.xo-shell {
  margin-left: var(--rail-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
}

.xo-main {
  flex: 1 1 auto;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(26px, 4vw, 56px) var(--gut) clamp(40px, 6vw, 72px);
}

/* 顶部细标尺 */
.xo-main::before {
  content: "";
  display: block;
  height: 6px;
  margin-bottom: clamp(20px, 3vw, 34px);
  background-image: repeating-linear-gradient(90deg, var(--xo-line-2) 0 1px, transparent 1px 12px);
  background-position: left bottom;
  background-repeat: repeat-x;
  background-size: 12px 6px;
  opacity: 0.55;
}

/* ---------------- 移动端顶栏 ---------------- */

.xo-topbar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 70;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: rgba(244, 239, 228, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--xo-line);
}

.xo-topbar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 0;
  color: var(--xo-ink);
}

.xo-topbar__brand .xo-brand__seal {
  width: 32px;
  height: 32px;
  flex-basis: 32px;
  font-size: 0.7rem;
  background: rgba(161, 49, 39, 0.1);
  border-color: rgba(161, 49, 39, 0.4);
  color: var(--xo-seal);
}

.xo-topbar__brand span:last-child {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.xo-topbar__brand strong {
  font-family: var(--f-serif);
  font-size: 0.94rem;
  letter-spacing: 0.1em;
}

.xo-topbar__brand em {
  font-family: var(--f-mono);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--xo-ink-4);
}

.xo-topbar__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--xo-line-2);
  border-radius: var(--r-s);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.xo-topbar__bars,
.xo-topbar__bars::before,
.xo-topbar__bars::after {
  display: block;
  width: 14px;
  height: 1px;
  background: var(--xo-ink);
}

.xo-topbar__bars {
  position: relative;
}

.xo-topbar__bars::before,
.xo-topbar__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.xo-topbar__bars::before {
  top: -4px;
}

.xo-topbar__bars::after {
  top: 4px;
}

.xo-scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(16, 20, 23, 0.55);
  backdrop-filter: blur(2px);
}

.xo-scrim[hidden] {
  display: none;
}

/* ---------------- 面包屑 ---------------- */

.xo-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--xo-ink-4);
  margin-bottom: 22px;
}

.xo-crumbs a {
  border-bottom: 0;
  color: var(--xo-ink-3);
}

.xo-crumbs span[aria-current] {
  color: var(--xo-ink);
}

/* ---------------- 页头 ---------------- */

.xo-page-head {
  padding-bottom: 26px;
  border-bottom: 1px solid var(--xo-line-2);
  margin-bottom: clamp(28px, 4vw, 46px);
  position: relative;
}

.xo-page-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 82px;
  height: 2px;
  background: var(--xo-seal);
}

.xo-eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--xo-ink-4);
  text-transform: uppercase;
  margin-bottom: 18px;
}

.xo-eyebrow__tag {
  padding: 3px 9px;
  border: 1px solid rgba(161, 49, 39, 0.45);
  border-radius: var(--r-s);
  color: var(--xo-seal);
  letter-spacing: 0.1em;
}

.xo-title {
  max-width: 22ch;
  margin-bottom: 0.35em;
  text-wrap: balance;
}

.xo-lead {
  font-family: var(--f-serif);
  font-size: clamp(1rem, 1.35vw, 1.12rem);
  line-height: 1.95;
  color: var(--xo-ink-3);
  max-width: 58ch;
  margin-bottom: 20px;
}

.xo-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--xo-ink-4);
}

.xo-meta li {
  margin: 0;
}

.xo-meta li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--xo-line-2);
}

/* ---------------- 页脚 ---------------- */

.xo-footer {
  background: var(--xo-night);
  color: rgba(244, 239, 228, 0.68);
  padding: clamp(36px, 5vw, 60px) var(--gut) 24px;
  font-size: 0.86rem;
  line-height: 1.85;
}

.xo-footer__grid {
  max-width: var(--shell-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.55fr 0.8fr 0.8fr 1.1fr;
  gap: clamp(20px, 3vw, 42px);
}

.xo-footer__mark {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.xo-footer__mark .xo-brand__seal {
  width: 46px;
  height: 46px;
  flex-basis: 46px;
}

.xo-footer__name {
  font-family: var(--f-serif);
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  color: var(--xo-paper);
  margin: 0;
}

.xo-footer__sub {
  margin: 2px 0 0;
  font-size: 0.72rem;
  color: rgba(244, 239, 228, 0.4);
}

.xo-footer__desc {
  color: rgba(244, 239, 228, 0.55);
  margin-bottom: 12px;
}

.xo-footer__domain {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: rgba(244, 239, 228, 0.4);
  margin: 0;
}

.xo-footer__col h3 {
  font-family: var(--f-mono);
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(244, 239, 228, 0.42);
  margin-bottom: 14px;
}

.xo-footer__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.xo-footer__col li {
  margin: 0 0 8px;
}

.xo-footer__col a {
  color: rgba(244, 239, 228, 0.72);
  border-bottom: 1px solid transparent;
}

.xo-footer__col a:hover {
  color: #fff;
  border-bottom-color: rgba(244, 239, 228, 0.4);
}

.xo-footer__contact li {
  color: rgba(244, 239, 228, 0.55);
  font-size: 0.8rem;
}

.xo-footer__note {
  max-width: var(--shell-max);
  margin: 32px auto 0;
  padding: 16px 18px;
  border: 1px solid var(--xo-line-light);
  border-left: 2px solid var(--xo-seal-2);
  border-radius: var(--r-s);
  background: rgba(244, 239, 228, 0.03);
  font-size: 0.76rem;
  color: rgba(244, 239, 228, 0.5);
}

.xo-footer__note p {
  margin: 0;
}

.xo-footer__note strong {
  color: rgba(244, 239, 228, 0.82);
}

.xo-footer__bottom {
  max-width: var(--shell-max);
  margin: 26px auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--xo-line-light);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.72rem;
  color: rgba(244, 239, 228, 0.38);
}

.xo-footer__bottom p {
  margin: 0;
}

.xo-footer__bottom a {
  color: rgba(244, 239, 228, 0.55);
  border-bottom: 0;
}

/* ---------------- 断点 ---------------- */

@media (max-width: 1120px) {
  .xo-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 1024px) {
  :root {
    --rail-w: 0px;
  }

  .xo-shell {
    margin-left: 0;
  }

  .xo-rail {
    width: min(320px, 84vw);
    transform: translateX(-102%);
    transition: transform 0.34s var(--ease);
    box-shadow: 0 0 60px rgba(0, 0, 0, 0.35);
  }

  .xo-body.is-drawer-open .xo-rail {
    transform: none;
  }

  .xo-rail__close {
    display: block;
  }

  .xo-topbar {
    display: flex;
  }

  .xo-main {
    padding-top: 22px;
  }

  .xo-main::before {
    display: none;
  }

  body.is-drawer-open {
    overflow: hidden;
  }
}

@media (max-width: 640px) {
  .xo-footer__grid {
    grid-template-columns: 1fr;
  }

  .xo-page-head {
    margin-bottom: 26px;
  }

  .xo-title {
    max-width: none;
  }
}