/* ============================================================
   小鸟棋牌体育 · 共享外壳样式 /assets/site.css
   晨雾蓝底 · 雀羽青锚点 · 切角与斜向动势
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root {
  --mist: #D7E6EC;
  --fog: #F4F8F7;
  --jade: #1F8A7A;
  --ink: #102A2E;
  --night: #244B5A;
  --gold: #D8A54A;
  --cinnabar: #C64B3C;
  --slate: #52706E;
  --board: #C9D8D4;
  --glow: #F0D9A6;

  --rail-w: 232px;
  --gutter: clamp(18px, 4vw, 56px);
  --max: 1280px;
  --cut: 16px;

  --font-sans: "HarmonyOS Sans SC", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  --ease: cubic-bezier(.22, .7, .24, 1);
}

/* ---------- 2. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body { margin: 0; }

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

h1, h2, h3, h4, h5, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; }
table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

::selection {
  background: var(--jade);
  color: var(--fog);
}

/* ---------- 3. 中文基础排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--ink);
  background-color: var(--mist);
  background-image: linear-gradient(180deg, rgba(244, 248, 247, .6) 0%, rgba(215, 230, 236, 0) 42%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

p { text-wrap: pretty; }

/* ---------- 4. 版面工具 ---------- */
.container {
  width: min(calc(100% - (var(--gutter) * 2)), var(--max));
  margin-inline: auto;
}

.section { padding-block: clamp(40px, 6vw, 88px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  padding-block-end: 14px;
  margin-block-end: clamp(22px, 3vw, 34px);
  border-block-end: 1px solid var(--board);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--jade);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  flex: none;
  background: linear-gradient(90deg, var(--cinnabar), var(--gold));
  transform: skewX(-18deg);
}

.display {
  font-size: clamp(44px, 8vw, 112px);
  font-weight: 800;
  line-height: .98;
  letter-spacing: -.04em;
}

.heading {
  font-size: clamp(26px, 4vw, 52px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -.02em;
}

.lede {
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.7;
  color: var(--slate);
  max-width: 56ch;
}

.mono {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
}

.num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 42px);
  letter-spacing: .02em;
  line-height: 1;
  color: var(--jade);
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(20px, 3vw, 34px);
  background: linear-gradient(90deg, var(--board) 0%, var(--board) 58%, rgba(201, 216, 212, 0) 100%);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 28px);
}

/* ---------- 5. 面板 / 标签 / 按钮 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: var(--fog);
  border: 1px solid var(--board);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.panel--ink {
  background: linear-gradient(160deg, var(--ink), var(--night));
  color: var(--fog);
  border-color: transparent;
}

.panel--glow {
  background: var(--glow);
  border-color: rgba(216, 165, 74, .5);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  background: var(--glow);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 9px 100%, 0 calc(100% - 9px));
}

.tag--jade {
  background: var(--jade);
  color: var(--fog);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  background: var(--fog);
  color: var(--ink);
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transition: transform .18s var(--ease), background-color .18s var(--ease), color .18s var(--ease);
}

.btn:hover { transform: translateY(-2px); }
.btn:focus-visible { outline-offset: -3px; }

.btn--primary { background: var(--jade); color: var(--fog); }
.btn--ghost { background: transparent; border-color: currentColor; }

.btn--stamp {
  background: var(--glow);
  color: var(--ink);
  border-block-end: 2px solid var(--cinnabar);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--slate);
}

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

.breadcrumbs li:not(:first-child)::before {
  content: "/";
  color: var(--board);
}

.breadcrumbs a:hover { color: var(--jade); }

/* ---------- 7. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, var(--mist), var(--board));
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

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

.media-frame--void {
  background-image:
    repeating-linear-gradient(118deg, rgba(31, 138, 122, .16) 0 2px, rgba(31, 138, 122, 0) 2px 14px),
    linear-gradient(135deg, var(--fog), var(--mist));
}

.media-frame > img,
.media-frame > picture,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame > picture { display: block; height: 100%; }

.media-frame__cap {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  padding: 10px 14px;
  background: rgba(16, 42, 46, .82);
  color: var(--fog);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
}

/* ---------- 8. 跳转链接与阅读进度 ---------- */
.skip-link {
  position: fixed;
  inset-block-start: 8px;
  inset-inline-start: 8px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--fog);
  font-size: 14px;
  letter-spacing: .04em;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transform: translateY(-160%);
  transition: transform .2s var(--ease);
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 2px;
}

.progress-rail {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: 3px;
  z-index: 90;
  background: rgba(16, 42, 46, .14);
  pointer-events: none;
}

.progress-rail__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--jade) 0%, var(--gold) 64%, var(--cinnabar) 100%);
  transition: transform .12s linear;
}

/* ---------- 9. 头部：侧边轨道 / 顶部抽屉 ---------- */
.site-header {
  position: relative;
  z-index: 70;
}

.rail {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rail__brand {
  display: flex;
  align-items: center;
  gap: 11px;
  padding-block: 2px;
}

.rail__mark {
  width: 34px;
  height: 34px;
  flex: none;
  background: linear-gradient(140deg, var(--jade) 0%, var(--jade) 52%, var(--gold) 52%, var(--gold) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 74%, 0 100%);
  border-radius: 0 9px 0 9px;
  transition: transform .24s var(--ease);
}

.rail__brand:hover .rail__mark { transform: rotate(-4deg) translateY(-1px); }

.rail__wordmark {
  font-size: 20px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.01em;
  white-space: nowrap;
}

.rail__wordmark em {
  font-style: normal;
  color: var(--gold);
  margin-inline-start: 1px;
}

.rail__descriptor {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: rgba(244, 248, 247, .55);
  margin-block: 6px 0;
}

.rail__nav { margin-block: 18px 14px; }

.nav-list {
  counter-reset: nav;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.nav-list > li { counter-increment: nav; }

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  font-size: 15px;
  line-height: 1.4;
  color: rgba(244, 248, 247, .76);
  border-radius: 2px;
  transition: background-color .18s var(--ease), color .18s var(--ease), transform .18s var(--ease);
}

.nav-link::before {
  content: counter(nav, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  color: rgba(215, 230, 236, .42);
  transition: color .18s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--fog);
  background: rgba(215, 230, 236, .1);
  transform: translateX(2px);
}

.nav-link[aria-current="page"] {
  color: var(--fog);
  background: rgba(31, 138, 122, .32);
  box-shadow: inset 3px 0 0 var(--cinnabar);
}

.nav-link[aria-current="page"]::before { color: var(--gold); }

.rail__cta {
  display: block;
  margin-block-start: auto;
  padding: 12px 14px;
  background: linear-gradient(100deg, var(--jade), var(--night));
  color: var(--fog);
  font-size: 14px;
  letter-spacing: .06em;
  border-block-start: 2px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: filter .18s var(--ease), transform .18s var(--ease);
}

.rail__cta:hover { filter: brightness(1.12); transform: translateY(-2px); }
.rail__cta:focus-visible { outline-offset: -3px; }

.rail__meta {
  margin-block-start: 12px;
  color: rgba(244, 248, 247, .46);
}

.rail__meta .mono { font-size: 10.5px; }

/* 移动导航按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  font-size: 13.5px;
  letter-spacing: .1em;
  color: var(--fog);
  background: rgba(244, 248, 247, .08);
  border: 1px solid rgba(244, 248, 247, .3);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.nav-toggle:focus-visible { outline-offset: -3px; outline-color: var(--glow); }

.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color .2s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform .2s var(--ease), top .2s var(--ease);
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

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

@keyframes drawer-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

@keyframes item-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 10. 桌面端：固定侧轨 ---------- */
@media (min-width: 1025px) {
  body { padding-inline-start: var(--rail-w); }

  .rail {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    z-index: 60;
    width: var(--rail-w);
    padding: 30px 20px 22px;
    overflow-y: auto;
    overscroll-behavior: contain;
    color: var(--fog);
    background-image:
      repeating-linear-gradient(112deg, rgba(215, 230, 236, .05) 0 1px, rgba(215, 230, 236, 0) 1px 13px),
      linear-gradient(176deg, #102A2E 0%, #1B3F49 62%, #244B5A 100%);
    border-inline-end: 1px solid rgba(201, 216, 212, .18);
  }

  .nav-toggle { display: none; }
  .rail__descriptor { display: block; }
  .rail__nav { display: block; }
  .rail__cta { display: block; }
  .rail__meta { display: block; }
}

/* ---------- 11. 平板与手机：顶部条 + 抽屉 ---------- */
@media (max-width: 1024px) {
  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 80;
    color: var(--fog);
    background-image:
      repeating-linear-gradient(112deg, rgba(215, 230, 236, .045) 0 1px, rgba(215, 230, 236, 0) 1px 12px),
      linear-gradient(180deg, #102A2E, #1B3F49);
    border-block-end: 1px solid rgba(201, 216, 212, .22);
  }

  .rail {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand toggle"
      "nav nav"
      "cta cta"
      "meta meta";
    align-items: center;
    column-gap: 12px;
    padding: 10px var(--gutter) 12px;
  }

  .rail__brand { grid-area: brand; }
  .rail__wordmark { font-size: 18px; }
  .rail__descriptor { display: none; }
  .nav-toggle { grid-area: toggle; }

  .rail__nav {
    grid-area: nav;
    display: none;
    margin-block: 0;
  }

  .rail__cta {
    grid-area: cta;
    display: none;
    margin-block-start: 10px;
  }

  .rail__meta {
    grid-area: meta;
    display: none;
    margin-block-start: 8px;
  }

  .site-header[data-open] .rail__nav {
    display: block;
    padding-block: 12px 4px;
    border-block-start: 1px solid rgba(215, 230, 236, .2);
    animation: drawer-in .24s var(--ease) both;
  }

  .site-header[data-open] .rail__cta { display: block; }
  .site-header[data-open] .rail__meta { display: block; }

  .site-header[data-open] .nav-list > li {
    animation: item-in .26s var(--ease) both;
  }

  .site-header[data-open] .nav-list > li:nth-child(1) { animation-delay: .02s; }
  .site-header[data-open] .nav-list > li:nth-child(2) { animation-delay: .06s; }
  .site-header[data-open] .nav-list > li:nth-child(3) { animation-delay: .1s; }
  .site-header[data-open] .nav-list > li:nth-child(4) { animation-delay: .14s; }
  .site-header[data-open] .nav-list > li:nth-child(5) { animation-delay: .18s; }
  .site-header[data-open] .nav-list > li:nth-child(6) { animation-delay: .22s; }

  .nav-link {
    padding: 12px 10px;
    font-size: 16px;
    border-block-end: 1px solid rgba(215, 230, 236, .1);
  }

  .nav-link:hover,
  .nav-link:focus-visible { transform: none; }
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  margin-block-start: clamp(56px, 8vw, 112px);
  background: var(--mist);
  background-image: linear-gradient(180deg, rgba(244, 248, 247, .7), rgba(215, 230, 236, 0) 60%);
  background-repeat: no-repeat;
  color: var(--ink);
  border-block-start: 3px solid var(--ink);
}

.footer__inner {
  width: min(calc(100% - (var(--gutter) * 2)), var(--max));
  margin-inline: auto;
  padding-block: clamp(38px, 5vw, 68px) clamp(32px, 4vw, 56px);
  display: grid;
  grid-template-columns: 1.5fr .9fr .9fr 1.3fr;
  gap: clamp(24px, 3.6vw, 52px);
}

.footer__wordmark {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
}

.footer__wordmark em {
  font-style: normal;
  color: var(--jade);
  margin-inline-start: 2px;
}

.footer__tagline {
  margin-block: 12px 22px;
  max-width: 24ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
}

.footer__title {
  margin-block-end: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--jade);
}

.footer__list li + li { margin-block-start: 10px; }

.footer__list a {
  display: inline-block;
  font-size: 15px;
  color: var(--ink);
  border-block-end: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer__list a:hover,
.footer__list a:focus-visible {
  color: var(--jade);
  border-block-end-color: var(--gold);
}

.footer__meta { margin: 0; }

.footer__meta-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  padding-block: 7px;
  border-block-end: 1px dashed rgba(82, 112, 110, .3);
}

.footer__meta-row dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--jade);
  padding-block-start: 3px;
}

.footer__meta-row dd {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.footer__base {
  background: var(--night);
  color: rgba(244, 248, 247, .82);
}

.footer__base-inner {
  width: min(calc(100% - (var(--gutter) * 2)), var(--max));
  margin-inline: auto;
  padding-block: 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 32px;
  font-size: 13px;
}

.footer__icp {
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--glow);
}

.footer__note { color: rgba(244, 248, 247, .55); }

/* ---------- 13. 中等屏幕 ---------- */
@media (max-width: 1024px) {
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .footer__lead { grid-column: 1 / -1; }
}

/* ---------- 14. 小屏 ---------- */
@media (max-width: 768px) {
  body { font-size: 16px; line-height: 1.72; }

  .grid-12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

  .footer__inner { grid-template-columns: 1fr; gap: 28px; }
  .footer__tagline { max-width: 30ch; }

  .footer__base-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (max-width: 480px) {
  .rail { padding-inline: 16px; }
  .rail__mark { width: 30px; height: 30px; }
  .rail__wordmark { font-size: 17px; }
  .nav-toggle { padding: 8px 11px; font-size: 12.5px; }
  .panel { padding: 18px; }
}

/* ---------- 15. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-delay: 0ms !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .progress-rail__fill { transition: none; }
  .btn:hover,
  .rail__cta:hover { transform: none; }
  .nav-link:hover,
  .nav-link:focus-visible { transform: none; }
  .rail__brand:hover .rail__mark { transform: none; }
}