/* =========================================================
   base.css — 设计令牌、环境层与共享组件
   首页与工具页共用。零外部依赖。
   ========================================================= */

:root{
  color-scheme:dark;
  --void:#04050c;
  --ink:#e9ecf8;
  --ink-2:#b7bfd8;
  --muted:#828cab;
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.16);

  --violet:#7c5cff;
  --cyan:#35e0ff;
  --mint:#48ffbe;
  --pink:#ff5ca8;
  --amber:#ffc46b;
  --orange:#ff8a3d;

  --glass:linear-gradient(160deg,rgba(255,255,255,.075),rgba(255,255,255,.022) 55%,rgba(255,255,255,.05));
  --glass-brd:rgba(255,255,255,.10);
  --shadow:0 24px 60px -28px rgba(0,0,0,.85);
  --shadow-hi:0 34px 90px -30px rgba(0,0,0,.95),0 0 0 1px rgba(255,255,255,.06);

  --font-sans:"Inter","HarmonyOS Sans SC","PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  /* mono 栈里必须留中文兜底：小标签（分类、计数、上一篇）都是 var(--font-mono)，
     纯拉丁栈会让中文掉到各平台默认字体，同一行里中英文明显是两套字。 */
  --font-mono:"JetBrains Mono","SF Mono",ui-monospace,"Cascadia Mono",Consolas,"Courier New","PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",monospace;
  /* 诗词、对联、经文这类「大字」用的字体栈：只用系统字体，页面不加载任何字体文件。
     顺序是先楷体（macOS / Windows 都命中真楷体），再往宋体一族收紧，最后通用 serif。
     要清楚这条栈在手机上是什么结果：iOS 出厂既没有楷体-简也没有宋体-简，两个都是
     「设置 → 通用 → 字体」里要单独下载的附加字体，没装就整串落空、卡片出来是苹方
     （2026-10-27 真机验过，不是推测）；读者自己装了字体，同一页才会变楷体。
     画卡片的两处 canvas 串必须和这里逐字相同，site-check 有一条断言守着。 */
  --font-kai:"Kaiti SC","STKaiti","KaiTi","楷体","Kaiti TC","Songti SC","STSong","Songti TC","宋体","Source Han Serif SC","Noto Serif CJK SC","Noto Serif SC","SimSun",serif;

  --shell:1180px;
  --gutter:clamp(20px,5vw,48px);
  --sect-gap:clamp(96px,13vw,176px);
  --radius:20px;
  --radius-sm:12px;
  --nav-h:68px;
  --ease:cubic-bezier(.22,.68,.24,1);
}

*,*::before,*::after{box-sizing:border-box}
/* 本站用 hidden 属性切视图与空态，但下面几乎每个容器都写了 display:grid/flex，
   作者样式会盖掉浏览器 UA 的 [hidden]{display:none}，元素就藏不住了。全局兜一条。 */
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 24px)}
body{
  margin:0;background:var(--void);color:var(--ink);
  font-family:var(--font-sans);
  font-size:clamp(15.5px,.55vw + 14px,17px);
  line-height:1.75;letter-spacing:.012em;overflow-x:hidden;
  /* 先 hidden 兜底；支持的浏览器改用 clip —— 它不建立滚动容器，栏目条的 position:sticky 才生效 */
  overflow-x:clip;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-3;pointer-events:none;
  background:
    radial-gradient(1100px 620px at 78% -8%,rgba(124,92,255,.30),transparent 62%),
    radial-gradient(900px 560px at 8% 12%,rgba(53,224,255,.16),transparent 60%),
    radial-gradient(1200px 900px at 50% 108%,rgba(255,92,168,.13),transparent 66%),
    linear-gradient(180deg,#05060e 0%,#070919 42%,#04050c 100%);
}
h1,h2,h3,h4{margin:0;line-height:1.22;letter-spacing:-.018em;font-weight:650}
p{margin:0 0 1.05em}
/* 末行只剩一两个汉字（孤字）在 700/1024 两档实测：正文 1826 个文本节点里 87 个、
   加 pretty 后 32 个；1024 档 85 个降到 22 个，行宽与溢出不变。
   不认识这个取值的浏览器直接忽略，属于渐进增强。 */
p,li,dd,td,h2,h3{text-wrap:pretty}
a{color:inherit;text-decoration:none}
ul,ol,dl{margin:0;padding:0;list-style:none}
img,svg{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
::selection{background:rgba(124,92,255,.42);color:#fff}

.shell{width:min(100% - var(--gutter)*2,var(--shell));margin-inline:auto}
.ico{width:1em;height:1em;flex:none}
.mono{font-family:var(--font-mono)}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
/* 只给读屏软件的文字：首页等只用 base.css 的页面也靠它 */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
.skiplink{
  position:fixed;top:14px;left:50%;translate:-50% -180%;z-index:100;
  padding:11px 20px;border-radius:999px;background:rgba(10,12,24,.92);
  border:1px solid var(--line-2);font-size:.86rem;transition:translate .25s var(--ease);
}
.skiplink:focus-visible{translate:-50% 0}

/* ---------- 环境层 ---------- */
.starfield{position:fixed;inset:0;z-index:-2;width:100%;height:100%;pointer-events:none;opacity:.85}
.aurora{position:fixed;inset:0;z-index:-2;pointer-events:none;filter:blur(70px);opacity:.55}
.aurora__blob{position:absolute;border-radius:50%;mix-blend-mode:screen;will-change:transform}
.aurora__blob--a{width:52vw;height:52vw;left:-12vw;top:-14vw;background:radial-gradient(circle,rgba(124,92,255,.55),transparent 66%);animation:drift-a 26s var(--ease) infinite alternate}
.aurora__blob--b{width:44vw;height:44vw;right:-10vw;top:22vh;background:radial-gradient(circle,rgba(53,224,255,.42),transparent 66%);animation:drift-b 32s var(--ease) infinite alternate}
.aurora__blob--c{width:50vw;height:50vw;left:26vw;bottom:-24vw;background:radial-gradient(circle,rgba(255,92,168,.34),transparent 66%);animation:drift-c 38s var(--ease) infinite alternate}
@keyframes drift-a{to{transform:translate3d(9vw,7vh,0) scale(1.14)}}
@keyframes drift-b{to{transform:translate3d(-11vw,10vh,0) scale(1.2)}}
@keyframes drift-c{to{transform:translate3d(7vw,-9vh,0) scale(1.1)}}

.spotlight{
  position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:0;transition:opacity .6s var(--ease);
  background:radial-gradient(420px circle at var(--mx,50%) var(--my,30%),rgba(151,124,255,.16),transparent 68%);
  mix-blend-mode:screen;
}
html.pointer-on .spotlight{opacity:1}

.grain{
  position:fixed;inset:-50%;z-index:60;pointer-events:none;opacity:.16;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
  animation:grain 7s steps(6) infinite;
}
@keyframes grain{
  0%{transform:translate(0,0)}20%{transform:translate(-3%,2%)}40%{transform:translate(2%,-3%)}
  60%{transform:translate(-2%,-2%)}80%{transform:translate(3%,1%)}100%{transform:translate(0,0)}
}

/* ---------- 按钮 / 标签 / 面板 ---------- */
.btn{
  --bg:transparent;
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  min-height:44px;
  padding:.86em 1.55em;border-radius:999px;font-size:.94rem;font-weight:600;letter-spacing:.02em;
  background:var(--bg);border:1px solid var(--glass-brd);
  position:relative;overflow:hidden;isolation:isolate;cursor:pointer;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease),color .3s var(--ease),background .3s var(--ease);
}
.btn::after{content:"";position:absolute;inset:0;z-index:-1;opacity:0;background:linear-gradient(120deg,rgba(255,255,255,.18),transparent 60%);transition:opacity .35s var(--ease)}
.btn:hover{transform:translateY(-2px)}
.btn:hover::after{opacity:1}
.btn:active{transform:translateY(0) scale(.985)}
.btn--primary{color:#0a0714;background:linear-gradient(100deg,var(--cyan),var(--violet) 58%,var(--pink));border-color:transparent;box-shadow:0 12px 34px -12px rgba(124,92,255,.75)}
.btn--primary:hover{box-shadow:0 20px 48px -14px rgba(124,92,255,.9)}
.btn--ghost{background:rgba(255,255,255,.045);backdrop-filter:blur(10px)}
.btn--ghost:hover{border-color:rgba(255,255,255,.3);background:rgba(255,255,255,.09)}
.btn--sm{padding:.6em 1.1em;font-size:.85rem;font-weight:550}
.btn--lg{padding:1.05em 2em;font-size:1.02rem}
.btn[disabled]{opacity:.4;pointer-events:none}

.tags{display:flex;flex-wrap:wrap;gap:7px}
.tags li{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;padding:.3em .62em;border-radius:7px;
  color:var(--ink-2);background:rgba(255,255,255,.05);border:1px solid var(--line);
}

.panel{
  position:relative;padding:clamp(24px,3vw,34px);border-radius:var(--radius);
  background:var(--glass);border:1px solid var(--glass-brd);
  backdrop-filter:blur(18px) saturate(150%);-webkit-backdrop-filter:blur(18px) saturate(150%);
  box-shadow:var(--shadow);
}
.panel::before{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:linear-gradient(180deg,rgba(255,255,255,.14),transparent 34%);
  mask:linear-gradient(#000,transparent 40%);-webkit-mask:linear-gradient(#000,transparent 40%);
}
.panel__title{font-size:1.06rem;letter-spacing:.02em;margin-bottom:18px}

.chip{
  display:inline-flex;align-items:center;justify-content:center;min-height:44px;
  padding:.56em 1.15em;border-radius:999px;font-size:.86rem;color:var(--muted);
  background:rgba(255,255,255,.04);border:1px solid var(--line);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);cursor:pointer;
  transition:color .3s var(--ease),background .3s var(--ease),border-color .3s var(--ease),transform .3s var(--ease);
}
.chip:hover{color:var(--ink);border-color:var(--line-2);transform:translateY(-1px)}
.chip.is-on{color:#0a0714;font-weight:620;border-color:transparent;background:linear-gradient(100deg,var(--cyan),var(--violet));box-shadow:0 8px 24px -10px rgba(124,92,255,.8)}

.badge{
  display:inline-flex;align-items:center;gap:5px;padding:.28em .6em;border-radius:999px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;
}
.badge--live{color:#04140d;background:var(--mint);box-shadow:0 0 18px -2px rgba(72,255,190,.7)}

/* ---------- 导航 ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;border-bottom:1px solid transparent;transition:background .4s var(--ease),border-color .4s var(--ease)}
.nav.is-stuck{background:rgba(6,8,18,.72);border-bottom-color:var(--line);backdrop-filter:blur(20px) saturate(160%);-webkit-backdrop-filter:blur(20px) saturate(160%)}
/* 导航高度用 --nav-h 定死：吸顶的栏目条与筛选条都靠它对齐，不能再让内容把高度撑大 */
.nav__inner{display:flex;align-items:center;gap:22px;padding:0;height:var(--nav-h);min-height:var(--nav-h)}
.brand{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-weight:700;letter-spacing:-.01em}
.brand__mark{
  width:32px;height:32px;display:grid;place-items:center;border-radius:10px;flex:none;
  font-size:.95rem;font-weight:800;color:#0a0714;
  background:linear-gradient(135deg,var(--cyan),var(--violet));
  box-shadow:0 6px 20px -6px rgba(124,92,255,.9);
}
.brand__text{font-size:1.02rem}
.brand__text i{font-style:normal;color:var(--muted);font-weight:500;font-size:.86em}
.brand--sm .brand__mark{width:26px;height:26px;border-radius:8px;font-size:.8rem}
.brand--sm .brand__text{font-size:.94rem}

.nav__links{display:flex;gap:4px;margin-left:auto}
.nav__links a{position:relative;padding:8px 14px;border-radius:999px;font-size:.9rem;color:var(--muted);transition:color .28s var(--ease),background .28s var(--ease)}
.nav__links a:hover{color:var(--ink);background:rgba(255,255,255,.055)}
.nav__links a.is-current{color:var(--ink)}
.nav__links a.is-current::after{content:"";position:absolute;left:50%;bottom:1px;translate:-50% 0;width:16px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--cyan),var(--violet))}
.nav__actions{display:flex;align-items:center;gap:12px}
.burger{display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.05);place-content:center;justify-items:center;cursor:pointer}
.burger span{display:block;width:18px;height:2px;border-radius:2px;background:var(--ink);margin:3.2px 0;transition:transform .3s var(--ease),opacity .3s var(--ease)}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(5.2px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.2px) rotate(-45deg)}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(255,255,255,.02),transparent);padding:44px 0 34px}
.footer__inner{display:grid;grid-template-columns:1.3fr auto 1fr;gap:28px;align-items:start}
.footer__brand p{margin:14px 0 0;font-size:.86rem;color:var(--muted);max-width:320px}
.footer__links{display:flex;flex-wrap:wrap;gap:8px 22px;padding-top:4px}
.footer__links a{font-size:.88rem;color:var(--muted);transition:color .3s var(--ease)}
.footer__links a:hover{color:var(--ink)}
.footer__meta{text-align:right;font-size:.8rem;color:var(--muted)}
.footer__meta p{margin:0 0 6px}
.footer__icp{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;opacity:.72}
/* 备案链接是这一页唯一必须点的法务入口，量出来热区只有 31 与 35（文字行高），
   所以把它撑成 44 高的行内块；两行各撑一次，不重叠。 */
.footer__icp a{display:inline-flex;align-items:center;min-height:44px}
/* 备案编号里有连着的一串数字，折行会把编号劈成两半；图标按官方要求排在编号前面。 */
.footer__gs{display:inline-flex;align-items:center;gap:5px;white-space:nowrap}
.footer__gs img{width:15px;height:auto}
.footer__icp a:hover{color:var(--ink)}
.footer__note{font-size:.74rem;opacity:.6;line-height:1.6;max-width:42em}

/* ---------- 入场动画 ---------- */
html.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .85s var(--ease),transform .85s var(--ease);transition-delay:var(--d,0ms)}
html.js .reveal.is-in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:760px){
  :root{--nav-h:60px}
  .nav__links{
    position:absolute;top:calc(100% + 8px);left:var(--gutter);right:var(--gutter);
    flex-direction:column;gap:2px;margin-left:0;padding:10px;border-radius:16px;
    background:rgba(8,10,20,.94);border:1px solid var(--line-2);
    backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);box-shadow:var(--shadow);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s;
  }
  .nav__links.is-open{opacity:1;visibility:visible;transform:none}
  .nav__links a{padding:12px 14px;font-size:.95rem;border-radius:11px}
  .nav__links a.is-current::after{display:none}
  .nav__links a.is-current{background:rgba(124,92,255,.16);color:#fff}
  .burger{display:grid}
  .nav__actions .btn--sm{display:none}
  .footer__inner{grid-template-columns:1fr;gap:22px}
  .footer__meta{text-align:left}
  .footer__links{padding-top:0}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html.js .reveal{opacity:1;transform:none}
  .grain{display:none}
}
@media (prefers-contrast:more){
  :root{--line:rgba(255,255,255,.24);--muted:#a9b2cc;--ink-2:#d6dcf0}
}