/* =========================================================
   小鸟棋牌主站 · 共享样式 /assets/site.css
   山雾中的牌桌实验室：米白纸 + 晨雾青 + 绒布绿 + 琥珀刻度
   ========================================================= */

:root{
  --paper:#F4F2EA;
  --bone:#FCFBF7;
  --mist:#7FA6A0;
  --felt:#2E5A4B;
  --ridge:#12201C;
  --amber:#C58A2B;
  --amber-ink:#8A5B12;
  --coral:#DE6A47;
  --moss:#6F8C5A;
  --slate:#59635E;
  --haze:#8FA3A6;
  --clay:#A9532F;

  --font-display:"Helvetica Neue","Arial Narrow","PingFang SC","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Roboto Mono","Courier New",monospace;

  --maxw:1240px;
  --pad:clamp(18px,4vw,40px);
  --radius:14px;
  --line:rgba(18,32,28,.12);
  --shadow:0 1px 0 rgba(18,32,28,.05),0 10px 26px -20px rgba(18,32,28,.7);
}

*,*::before,*::after{box-sizing:border-box}

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

body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,hr{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
svg{display:block}

body{
  background:var(--paper);
  color:var(--ridge);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

/* ---------------- 字号阶 ---------------- */
h1,.h1{
  font-family:var(--font-display);font-weight:800;font-stretch:condensed;
  font-size:clamp(40px,6vw,72px);line-height:1.05;letter-spacing:-.02em;
  color:var(--ridge);margin-bottom:.35em;
}
h2,.h2{
  font-family:var(--font-display);font-weight:800;font-stretch:condensed;
  font-size:clamp(28px,3.6vw,40px);line-height:1.12;letter-spacing:-.015em;
  color:var(--ridge);margin-bottom:.5em;
}
h3,.h3{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(20px,2.2vw,28px);line-height:1.28;letter-spacing:-.01em;
  margin-bottom:.55em;
}
h4,.h4{font-family:var(--font-display);font-weight:700;font-size:20px;line-height:1.4;margin-bottom:.55em}
p{margin-bottom:1em}
p:last-child{margin-bottom:0}

.lede{font-size:18px;line-height:1.8;color:var(--slate);max-width:36em}
.prose{max-width:34em}
.prose p{margin-bottom:1.1em}
.prose a{color:var(--felt);text-decoration:underline;text-underline-offset:3px}
.prose h2,.prose h3{margin-top:1.6em}

.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:500;letter-spacing:0}

/* ---------------- 布局 ---------------- */
.shell{width:min(var(--maxw),100% - var(--pad) * 2);margin-inline:auto}
.shell--narrow{width:min(880px,100% - var(--pad) * 2);margin-inline:auto}
.section{padding-block:clamp(48px,7vw,88px)}
.section--tight{padding-block:clamp(32px,4vw,52px)}
.stack{display:flex;flex-direction:column;gap:16px}

.grid{display:grid;gap:clamp(20px,2.4vw,32px)}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--3-9{grid-template-columns:3fr 9fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--4{grid-template-columns:repeat(4,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}

/* ---------------- 焦点 ---------------- */
:focus-visible{
  outline:3px solid var(--amber);
  outline-offset:3px;
  border-radius:6px;
}

/* ---------------- 按钮 ---------------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border-radius:999px;border:1px solid transparent;
  font-family:var(--font-body);font-size:16px;font-weight:600;line-height:1.2;
  text-decoration:none;cursor:pointer;
  transition:background-color .2s ease-out,color .2s ease-out,border-color .2s ease-out,transform .2s ease-out;
}
.btn--primary{background:var(--felt);color:var(--bone)}
.btn--primary:hover{background:var(--ridge)}
.btn--ghost{background:transparent;border-color:rgba(18,32,28,.22);color:var(--ridge)}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber-ink)}
.btn--quiet{background:rgba(127,166,160,.18);color:var(--ridge)}
.btn--quiet:hover{background:rgba(127,166,160,.3)}

/* ---------------- 面包屑 ---------------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;line-height:1.6;color:var(--slate);margin-bottom:22px;
}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:var(--haze)}
.crumbs a{color:var(--slate);text-decoration:none}
.crumbs a:hover{color:var(--amber-ink)}
.crumbs [aria-current="page"]{color:var(--ridge);font-weight:600}

/* ---------------- 眉标 / 旁注 / 标签 ---------------- */
.eyebrow{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-display);font-weight:700;font-size:12px;
  letter-spacing:.2em;color:var(--slate);margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--amber);flex:none}

.annot{
  font-size:13px;line-height:1.75;color:var(--slate);
  border-left:2px solid var(--amber);padding-left:12px;max-width:26em;
}
.annot--vertical{
  writing-mode:vertical-rl;
  border-left:0;border-top:2px solid var(--amber);
  padding:12px 0 0;max-height:22em;letter-spacing:.14em;
}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:999px;
  font-family:var(--font-display);font-weight:700;font-size:12px;letter-spacing:.06em;
  background:rgba(143,163,166,.2);color:var(--ridge);white-space:nowrap;
}
.tag--moss{background:rgba(111,140,90,.2);color:#3E5232}
.tag--amber{background:rgba(197,138,43,.2);color:var(--amber-ink)}
.tag--coral{background:rgba(222,106,71,.18);color:#97401F}
.tag--felt{background:var(--felt);color:var(--bone)}

/* ---------------- 刻度与色带 ---------------- */
.divider-tick{
  height:12px;border:0;
  border-bottom:1px solid var(--line);
  background-image:repeating-linear-gradient(90deg,var(--haze) 0 1px,transparent 1px 22px);
  background-size:100% 6px;background-position:left bottom;background-repeat:repeat-x;
}
.range-band{
  height:10px;border-radius:999px;
  background:linear-gradient(90deg,var(--moss) 0%,#A39A4E 34%,var(--amber) 58%,#D08A3A 78%,var(--coral) 100%);
}

/* ---------------- 样本卡 ---------------- */
.sample-card{
  --card-rail:var(--moss);
  position:relative;display:flex;flex-direction:column;gap:12px;
  background:var(--bone);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 22px 18px;overflow:hidden;
}
.sample-card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--card-rail);
}
.sample-card__no{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:12px;letter-spacing:.14em;color:var(--slate);
}
.sample-card__tag{display:flex;flex-wrap:wrap;gap:8px}
.sample-card__value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:500;
  font-size:clamp(28px,3.4vw,40px);line-height:1;letter-spacing:-.01em;color:var(--ridge);
}
.sample-card__foot{
  margin-top:auto;padding-top:10px;border-top:1px dashed rgba(143,163,166,.7);
  font-size:12px;line-height:1.7;color:var(--slate);
}
.sample-card--felt{--card-rail:var(--mist);background:var(--felt);border-color:transparent;color:#E4EDE9}
.sample-card--felt .sample-card__no{color:#9FB3AE}
.sample-card--felt .sample-card__value{color:var(--bone)}
.sample-card--felt .sample-card__foot{border-top-color:rgba(127,166,160,.45);color:#A9BCB7}

/* ---------------- 图片容器基础规则 ---------------- */
.media{
  position:relative;overflow:hidden;border-radius:var(--radius);
  aspect-ratio:16/9;
  background:linear-gradient(155deg,var(--mist) 0%,var(--felt) 100%);
}
.media img,.media svg{width:100%;height:100%;object-fit:cover;display:block}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media--cut{clip-path:polygon(0 0,100% 0,100% 80%,78% 100%,0 100%);border-radius:0}
.media__cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:26px 16px 12px;font-size:12px;line-height:1.6;color:var(--bone);
  background:linear-gradient(to top,rgba(18,32,28,.78),rgba(18,32,28,0));
}

/* ---------------- 分段切换 ---------------- */
.segmented{
  display:inline-flex;flex-wrap:wrap;gap:4px;
  padding:4px;border-radius:999px;
  background:rgba(127,166,160,.16);border:1px solid var(--line);
}
.segmented [role="tab"]{
  border:0;background:transparent;cursor:pointer;
  padding:8px 16px;border-radius:999px;font-size:15px;font-weight:600;color:var(--ridge);
  transition:background-color .18s ease-out,color .18s ease-out;
}
.segmented [role="tab"]:hover{background:rgba(127,166,160,.26)}
.segmented [role="tab"][aria-selected="true"]{background:var(--felt);color:var(--bone)}
[role="tabpanel"]{padding-top:22px}
[role="tabpanel"][hidden]{display:none}

/* ---------------- 筛选 ---------------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.filter-chip{
  border:1px solid var(--line);background:var(--bone);cursor:pointer;
  padding:6px 14px;border-radius:999px;font-size:14px;font-weight:600;color:var(--slate);
  transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.filter-chip:hover{border-color:var(--amber);color:var(--amber-ink)}
.filter-chip[aria-pressed="true"]{background:var(--ridge);border-color:var(--ridge);color:var(--bone)}

/* ---------------- 锚点导轨 ---------------- */
.anchor-rail{
  position:sticky;top:120px;
  display:flex;flex-direction:column;gap:2px;
  border-left:1px solid rgba(143,163,166,.6);padding-left:14px;
}
.anchor-rail a{
  position:relative;font-size:13px;line-height:1.6;color:var(--slate);
  text-decoration:none;padding:4px 0;
}
.anchor-rail a:hover{color:var(--amber-ink)}
.anchor-rail a.is-active{color:var(--amber-ink);font-weight:700}
.anchor-rail a.is-active::before{
  content:"";position:absolute;left:-15px;top:50%;width:9px;height:2px;background:var(--amber);
}

/* ---------------- 分数轴 ---------------- */
.axis{--axis-pos:0%;position:relative;padding-top:28px}
.axis__track{
  position:relative;height:12px;border-radius:999px;
  background:linear-gradient(90deg,var(--moss) 0%,#A39A4E 40%,var(--amber) 68%,var(--coral) 100%);
  opacity:.92;
}
.axis__ticks{position:relative;height:30px;margin-top:8px}
.axis__tick{
  position:absolute;top:0;transform:translateX(-50%);
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:12px;color:var(--slate);text-align:center;white-space:nowrap;
}
.axis__tick::before{content:"";display:block;width:1px;height:8px;margin:0 auto 3px;background:var(--haze)}
.axis__pointer{
  position:absolute;top:18px;left:var(--axis-pos);
  width:22px;height:22px;padding:0;margin-left:-11px;
  border-radius:50%;background:var(--bone);border:3px solid var(--ridge);
  box-shadow:0 0 0 3px rgba(197,138,43,.38);cursor:grab;touch-action:none;
}
.axis__pointer:active{cursor:grabbing}
.axis__readout{
  margin-top:6px;font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:14px;color:var(--ridge);
}
.axis__zone{display:none}

/* ---------------- 显现动效协议 ---------------- */
.reveal-init{opacity:0;transform:translateY(14px);transition:opacity .4s ease-out,transform .4s ease-out}
.reveal-init.is-visible{opacity:1;transform:none}

/* ---------------- 滚动进度 ---------------- */
.scroll-scale{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:90;
  background:rgba(143,163,166,.3);pointer-events:none;
}
.scroll-scale__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--moss),var(--amber) 62%,var(--coral));
  transition:width .12s linear;
}

/* =========================================================
   页头
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:60;
  padding:16px var(--pad) 0;
  background:linear-gradient(180deg,var(--paper) 0%,var(--paper) 76%,rgba(244,242,234,0) 100%);
}
.skip-link{
  position:absolute;left:var(--pad);top:-64px;z-index:120;
  padding:10px 18px;border-radius:999px;
  background:var(--ridge);color:var(--bone);font-size:14px;font-weight:600;text-decoration:none;
  transition:top .2s ease-out;
}
.skip-link:focus{top:12px}

.header-shell{
  position:relative;
  width:min(var(--maxw),100%);
  margin-inline:auto;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
}

.nav-island{
  display:flex;align-items:center;
  background:var(--bone);
  border:1px solid var(--line);
  border-radius:999px;
  padding:6px 18px 6px 8px;
  box-shadow:var(--shadow);
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-mark{
  width:32px;height:32px;flex:none;padding:5px;border-radius:50%;
  background:rgba(127,166,160,.24);color:var(--felt);fill:currentColor;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--font-display);font-weight:800;font-size:16px;letter-spacing:-.01em;color:var(--ridge)}
.brand-sign{font-size:12px;letter-spacing:.08em;color:var(--slate)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  background:var(--bone);border:1px solid var(--line);border-radius:999px;
  padding:9px 16px;cursor:pointer;
  font-size:14px;font-weight:600;color:var(--ridge);
  box-shadow:var(--shadow);
}
.nav-toggle-bar{
  width:16px;height:2px;background:var(--ridge);
  box-shadow:0 -5px 0 var(--ridge),0 5px 0 var(--ridge);
}
.nav-toggle-label{letter-spacing:.08em}

.site-nav{
  display:flex;align-items:center;gap:10px;
  background:var(--bone);
  border:1px solid var(--line);
  border-radius:999px;
  padding:6px 8px;
  box-shadow:var(--shadow);
}
.nav-scale{display:flex;align-items:stretch}
.nav-scale > li + li{border-left:1px dashed rgba(143,163,166,.6)}
.nav-scale a{
  position:relative;display:block;
  padding:8px 13px 11px;border-radius:999px;
  font-size:15px;font-weight:500;color:var(--ridge);text-decoration:none;
  transition:background-color .18s ease-out,color .18s ease-out;
}
.nav-scale a:hover{background:rgba(127,166,160,.18)}
.nav-scale a[aria-current="page"]{color:var(--amber-ink);font-weight:700}
.nav-scale a[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:3px;
  width:8px;height:8px;margin-left:-4px;
  background:var(--amber);transform:rotate(45deg);
}
.nav-cta{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:999px;
  background:var(--felt);color:var(--bone);
  font-size:15px;font-weight:600;text-decoration:none;white-space:nowrap;
  transition:background-color .2s ease-out;
}
.nav-cta::after{content:"→";font-family:var(--font-mono)}
.nav-cta:hover{background:var(--ridge)}

.header-rail{
  width:min(var(--maxw),100%);
  margin:12px auto 0;height:9px;
  background-image:
    repeating-linear-gradient(90deg,var(--haze) 0 1px,transparent 1px 24px),
    repeating-linear-gradient(90deg,var(--amber) 0 2px,transparent 2px 96px);
  background-size:100% 5px,100% 9px;
  background-position:left bottom,left bottom;
  background-repeat:repeat-x;
  opacity:.55;
}

.site-header[data-scrolled] .brand-sign{display:none}
.site-header[data-scrolled] .nav-island,
.site-header[data-scrolled] .site-nav{padding-block:4px}
.site-header[data-scrolled] .header-rail{opacity:.9;height:7px}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;margin-top:clamp(56px,8vw,96px);
  background:var(--ridge);color:#DCE4E0;
}
.site-footer::before{
  content:"";display:block;height:10px;
  background-image:
    repeating-linear-gradient(90deg,rgba(127,166,160,.55) 0 1px,transparent 1px 24px),
    repeating-linear-gradient(90deg,rgba(197,138,43,.95) 0 2px,transparent 2px 96px);
  background-size:100% 6px,100% 10px;
  background-position:left bottom,left bottom;
  background-repeat:repeat-x;
  opacity:.85;
}
.footer-shell{width:min(var(--maxw),100% - var(--pad) * 2);margin-inline:auto;padding:56px 0 34px}

.footer-top{display:grid;grid-template-columns:1.1fr 2fr;gap:clamp(28px,4vw,56px)}
.footer-brandline{
  font-family:var(--font-display);font-weight:800;font-size:20px;line-height:1.35;
  letter-spacing:-.01em;color:var(--bone);margin-bottom:14px;
}
.footer-note{font-size:13px;line-height:1.8;color:#9FB3AE;max-width:30em}

.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.footer-col__heading{
  font-family:var(--font-display);font-weight:700;font-size:13px;
  letter-spacing:.16em;color:var(--mist);margin-bottom:14px;
}
.footer-list{display:grid;gap:10px}
.footer-list a{
  font-size:15px;color:#DCE4E0;text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .18s ease-out,border-color .18s ease-out;
}
.footer-list a:hover{color:var(--bone);border-bottom-color:var(--amber)}

.footer-meta{
  margin-top:44px;padding-top:24px;
  border-top:1px solid rgba(127,166,160,.32);
  display:grid;gap:10px;font-size:13px;line-height:1.8;color:#9FB3AE;
}
.footer-contact .num{color:#C9D6D2}
.footer-addr{color:#8FA3A6}

.footer-bottom{
  margin-top:26px;padding-top:18px;
  border-top:1px solid rgba(127,166,160,.2);
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:12px;letter-spacing:.04em;color:var(--haze);
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1000px){
  .grid--5-7,.grid--7-5,.grid--3-9,.grid--8-4{grid-template-columns:1fr}
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(2,1fr)}

  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:calc(100% + 14px);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:8px;
    padding:12px;border-radius:20px;display:none;
    background:var(--bone);
  }
  .site-nav[data-open]{display:flex}
  .nav-scale{flex-direction:column;align-items:stretch}
  .nav-scale > li + li{border-left:0;border-top:1px dashed rgba(143,163,166,.55)}
  .nav-scale a{padding:12px 14px;border-radius:12px}
  .nav-scale a[aria-current="page"]{background:rgba(197,138,43,.12)}
  .nav-scale a[aria-current="page"]::after{
    left:auto;right:16px;bottom:auto;top:50%;
    margin-left:0;transform:translateY(-50%) rotate(45deg);
  }
  .nav-cta{justify-content:center;margin-top:4px}

  .footer-top{grid-template-columns:1fr}
  .anchor-rail{position:static;border-left:0;padding-left:0;flex-direction:row;flex-wrap:wrap;gap:14px}
  .anchor-rail a.is-active::before{display:none}
}

@media (max-width:600px){
  body{font-size:16px;line-height:1.8}
  .grid--4,.grid--3{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr;gap:22px}
  .footer-shell{padding-top:44px}
  .nav-toggle-label{display:none}
  .axis__tick{font-size:11px}
  .annot--vertical{writing-mode:horizontal-tb;border-top:0;border-left:2px solid var(--amber);padding:0 0 0 12px}
}

/* =========================================================
   可访问性
   ========================================================= */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal-init{opacity:1;transform:none}
  .scroll-scale__fill{transition:none}
}