*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#f5f3f7;
  --surface:rgba(255,255,255,.72);
  --ink:#181528;
  --ink-2:#413a55;
  --muted:#8b859c;
  --line:rgba(24,21,40,.08);
  --line-strong:rgba(24,21,40,.14);
  --brand:#6c5ce7;
  --brand-deep:#4c3fd6;
  --brand-light:#8b7bff;
  --brand-soft:rgba(108,92,231,.10);
  --accent:#f0a04b;
  --ok:#22c55e;
  --r-md:16px;
  --r-lg:22px;
  --r-xl:30px;
  --sh-1:0 1px 2px rgba(24,21,40,.04),0 4px 12px -6px rgba(24,21,40,.08);
  --sh-2:0 14px 34px -16px rgba(24,21,40,.22);
  --sh-3:0 40px 80px -32px rgba(24,21,40,.30);
  --ease:cubic-bezier(.22,1,.36,1);
}

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

body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  color:var(--ink);
  line-height:1.65;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  background:
    radial-gradient(1200px 620px at 8% -12%, rgba(108,92,231,.16), transparent 62%),
    radial-gradient(900px 520px at 96% -4%, rgba(240,160,75,.14), transparent 58%),
    radial-gradient(900px 700px at 50% 112%, rgba(108,92,231,.10), transparent 62%),
    var(--bg);
  background-attachment:fixed;
}

img,video{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
::selection{background:rgba(108,92,231,.22)}

.wrap{width:min(1200px,calc(100% - 2.5rem));margin-inline:auto}

/* ============================================================
   语言切换
   ============================================================ */
body.lang-zh [data-en] { display: none !important; }
body.lang-en [data-zh] { display: none !important; }

/* ★ 语言切换按钮：圆角矩形 + 地球图标 + 语言标签 */
.lang-switch{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.4rem;

  height:36px;
  padding:0 .85rem;
  border-radius:10px;

  background:rgba(255,255,255,.78);
  border:1px solid var(--line-strong);
  color:var(--ink-2);
  cursor:pointer;
  font-weight:700;
  font-size:.76rem;
  letter-spacing:.02em;
  white-space:nowrap;

  transition:all .22s var(--ease);
  -webkit-tap-highlight-color:transparent;
}
.lang-switch:hover{
  background:#fff;
  border-color:rgba(108,92,231,.45);
  color:var(--brand-deep);
  transform:translateY(-1px);
  box-shadow:0 8px 18px -10px rgba(108,92,231,.75);
}
.lang-switch:hover .ico{
  transform:rotate(20deg);
}
.lang-switch:active{transform:scale(.97)}
.lang-switch:focus-visible{
  outline:2px solid var(--brand);
  outline-offset:3px;
}

/* 地球图标 */
.lang-switch .ico{
  width:15px;
  height:15px;
  flex:none;
  color:var(--brand-deep);
  transition:transform .35s var(--ease);
}

/* 语言标签 */
.lang-switch .lbl{
  line-height:1;
  background:linear-gradient(140deg,var(--brand),#b06ab3 70%,var(--accent));
  -webkit-background-clip:text;background-clip:text;
  color:transparent;
  font-weight:800;
  font-size:.78rem;
}

/* ============ 顶栏 ============ */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(247,245,250,.72);
  backdrop-filter:blur(18px) saturate(180%);
  -webkit-backdrop-filter:blur(18px) saturate(180%);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.8rem 0}

.logo{display:flex;align-items:center;gap:.65rem}
.logo-mark{
  width:38px;height:38px;border-radius:12px;flex:none;
  display:grid;place-items:center;color:#fff;
  background:linear-gradient(140deg,var(--brand),var(--brand-light));
  box-shadow:0 8px 18px -8px rgba(108,92,231,.9);
}
.logo-mark svg{width:21px;height:21px}
.logo-text{display:flex;flex-direction:column;line-height:1.1}
.logo-text b{font-size:1rem;font-weight:650;letter-spacing:-.01em}
.logo-text small{font-size:.6rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);font-weight:600}

.nav-actions{display:flex;align-items:center;gap:.7rem}
.nav-links{display:flex;align-items:center;gap:.2rem}
.nav-links a{
  padding:.5rem .85rem;border-radius:10px;font-size:.87rem;color:var(--ink-2);
  transition:background .2s,color .2s;
}
.nav-links a:hover{background:var(--brand-soft);color:var(--brand-deep)}
.nav-links a.active{background:var(--brand-soft);color:var(--brand-deep);font-weight:550}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;
  padding:.62rem 1.2rem;border-radius:12px;border:1px solid transparent;
  font-size:.88rem;font-weight:550;cursor:pointer;white-space:nowrap;
  transition:transform .18s var(--ease),box-shadow .25s,background .2s,border-color .2s,color .2s;
  -webkit-tap-highlight-color:transparent;
}
.btn:active{transform:scale(.97)}
.btn-sm{padding:.48rem .95rem;font-size:.82rem;border-radius:10px}
.btn-primary{
  background:linear-gradient(140deg,var(--brand),var(--brand-light));
  color:#fff;box-shadow:0 10px 24px -12px rgba(108,92,231,.95);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 32px -14px rgba(108,92,231,1)}
.btn-ghost{background:rgba(255,255,255,.72);border-color:var(--line-strong);color:var(--ink-2)}
.btn-ghost:hover{background:#fff;border-color:rgba(108,92,231,.35);color:var(--brand-deep)}

/* ============ 页头 ============ */
.page-head{padding:3.5rem 0 2rem;text-align:center}
.page-head .eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.35rem .95rem;border-radius:999px;
  background:rgba(255,255,255,.72);
  border:1px solid var(--line-strong);
  font-size:.78rem;color:var(--ink-2);
  box-shadow:var(--sh-1);
}
.page-head h1{
  margin-top:1.35rem;
  font-size:clamp(1.9rem,5vw,2.75rem);
  line-height:1.15;letter-spacing:-.035em;font-weight:730;
}
.page-head h1 em{
  font-style:normal;
  background:linear-gradient(100deg,var(--brand),#b06ab3 65%,var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.page-head p{
  margin:1rem auto 0;max-width:36rem;
  color:var(--muted);font-size:.95rem;
}

/* ============ 文档区 ============ */
.doc-section{padding:.5rem 0 2.75rem}

.doc-panel{
  background:var(--surface);
  backdrop-filter:blur(20px) saturate(165%);
  -webkit-backdrop-filter:blur(20px) saturate(165%);
  border:1px solid rgba(255,255,255,.85);
  border-radius:var(--r-xl);
  box-shadow:var(--sh-2);
  padding:clamp(1.5rem,4vw,3rem);
  min-width:0;
  overflow:hidden;
}

.doc-meta{
  display:flex;flex-wrap:wrap;gap:.5rem 1.25rem;
  align-items:center;
  padding-bottom:1.25rem;
  border-bottom:1px dashed var(--line-strong);
  margin-bottom:1.5rem;
  font-size:.8rem;color:var(--muted);
}
.doc-meta .badge{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.25rem .7rem;border-radius:999px;
  background:var(--brand-soft);color:var(--brand-deep);
  font-size:.74rem;font-weight:650;
  border:1px solid rgba(108,92,231,.18);
}
.doc-meta .badge::before{
  content:"";width:5px;height:5px;border-radius:50%;
  background:var(--ok);
}
.doc-meta .date{
  margin-left:auto;
  font-size:.76rem;
  color:var(--muted);
}

.doc-summary{
  padding:1.1rem 1.25rem;
  border-radius:14px;
  background:
    radial-gradient(420px 200px at 88% -20%, rgba(108,92,231,.16), transparent 70%),
    linear-gradient(165deg, rgba(255,255,255,.95), rgba(244,240,252,.92));
  border:1px solid rgba(108,92,231,.18);
  margin-bottom:2rem;
  font-size:.86rem;
  color:var(--ink-2);
  line-height:1.85;
}
.doc-summary strong{color:var(--brand-deep);font-weight:700}

.doc-body{font-size:.9rem;color:var(--ink-2);line-height:1.9}
.doc-body h2{
  font-size:1.08rem;font-weight:680;letter-spacing:-.01em;
  margin:2rem 0 .75rem;color:var(--ink);
  padding-left:.8rem;position:relative;
  scroll-margin-top:5.5rem;
}
.doc-body h2::before{
  content:"";position:absolute;left:0;top:.42em;
  width:3px;height:1em;border-radius:2px;
  background:linear-gradient(180deg,var(--brand),var(--brand-light));
}
.doc-body h2:first-of-type{margin-top:0}

.doc-body h3{
  font-size:.95rem;font-weight:650;
  margin:1.35rem 0 .45rem;color:var(--ink);
}

.doc-body p{margin-bottom:.75rem}
.doc-body p strong{color:var(--ink-2);font-weight:650}

.doc-body ul,
.doc-body ol{
  padding-left:1.2rem;
  margin:.4rem 0 1rem;
}
.doc-body li{
  margin-bottom:.4rem;
  word-break:break-word;
}
.doc-body li::marker{color:rgba(108,92,231,.55)}
.doc-body li strong{color:var(--ink-2);font-weight:650}

.doc-body a{
  color:var(--brand-deep);
  text-decoration:underline;
  text-underline-offset:2px;
  word-break:break-word;
  transition:color .2s;
}
.doc-body a:hover{color:var(--brand)}

.callout{
  display:flex;gap:.8rem;
  padding:1rem 1.15rem;
  border-radius:14px;
  background:rgba(108,92,231,.07);
  border-left:3px solid var(--brand);
  margin:1.25rem 0;
  font-size:.85rem;color:var(--ink-2);line-height:1.8;
}
.callout .ci{font-size:1.05rem;line-height:1.4;flex:none}
.callout strong{color:var(--brand-deep);font-weight:700}

.rights-grid{
  display:grid;gap:.9rem;
  margin:1rem 0 1.25rem;
}
@media(min-width:640px){.rights-grid{grid-template-columns:1fr 1fr}}

.right-item{
  display:flex;gap:.8rem;
  padding:1rem 1.1rem;
  border-radius:14px;
  background:rgba(255,255,255,.72);
  border:1px solid rgba(255,255,255,.95);
  box-shadow:var(--sh-1);
  transition:transform .28s var(--ease),box-shadow .28s,border-color .2s;
  min-width:0;
}
.right-item:hover{
  transform:translateY(-3px);
  box-shadow:var(--sh-2);
  border-color:rgba(108,92,231,.28);
}
.right-item .ri{
  width:34px;height:34px;flex:none;border-radius:11px;
  display:grid;place-items:center;font-size:1rem;
  background:linear-gradient(140deg,rgba(108,92,231,.14),rgba(240,160,75,.16));
}
.right-item b{
  display:block;font-size:.88rem;font-weight:650;
  margin-bottom:.15rem;color:var(--ink);
}
.right-item span{
  font-size:.79rem;color:var(--muted);line-height:1.65;
  word-break:break-word;
}

.dont-list{
  list-style:none;padding:0;margin:.5rem 0 1.25rem;
  display:flex;flex-direction:column;gap:.55rem;
}
.dont-list li{
  display:flex;gap:.6rem;align-items:flex-start;
  padding:.75rem .95rem;
  border-radius:12px;
  background:rgba(34,197,94,.07);
  border:1px solid rgba(34,197,94,.16);
  font-size:.85rem;color:#166534;line-height:1.7;
  word-break:break-word;
}
.dont-list li::before{
  content:"✓";
  color:#16a34a;font-weight:700;flex:none;
  font-size:.9rem;line-height:1.5;
}

.toc{
  padding:1.1rem 1.25rem;
  border-radius:14px;
  background:rgba(255,255,255,.68);
  border:1px solid rgba(255,255,255,.95);
  box-shadow:var(--sh-1);
  margin-bottom:1.75rem;
}
.toc-title{
  font-size:.78rem;font-weight:650;
  color:var(--muted);letter-spacing:.08em;text-transform:uppercase;
  margin-bottom:.7rem;
  display:flex;align-items:center;gap:.5rem;
}
.toc-title::before{
  content:"";width:3px;height:12px;border-radius:2px;
  background:linear-gradient(180deg,var(--brand),var(--brand-light));
  flex:none;
}
.toc-list{
  display:flex;flex-wrap:wrap;gap:.4rem;
}
.toc-list a{
  display:inline-flex;align-items:center;
  padding:.32rem .75rem;border-radius:9px;
  background:rgba(108,92,231,.07);
  border:1px solid rgba(108,92,231,.14);
  font-size:.76rem;color:var(--ink-2);
  transition:background .2s,border-color .2s,color .2s;
}
.toc-list a:hover{
  background:rgba(108,92,231,.14);
  border-color:rgba(108,92,231,.28);
  color:var(--brand-deep);
}

.doc-actions{
  margin-top:2rem;padding-top:1.5rem;
  border-top:1px dashed var(--line-strong);
  display:flex;flex-wrap:wrap;gap:.7rem;align-items:center;
  justify-content:space-between;
}
.doc-actions .note{font-size:.78rem;color:var(--muted)}

/* ============ 页脚 ============ */
.site-footer{
  margin-top:1rem;border-top:1px solid var(--line);
  padding:2.5rem 0 2.75rem;text-align:center;
}
.footer-brand{display:inline-flex;align-items:center;gap:.55rem;margin-bottom:1rem}
.footer-brand .logo-mark{width:30px;height:30px;border-radius:9px}
.footer-brand .logo-mark svg{width:17px;height:17px}
.footer-brand b{font-size:.92rem;font-weight:650}
.footer-note{font-size:.82rem;color:var(--muted);margin-bottom:1.1rem}
.footer-links{display:flex;flex-wrap:wrap;gap:.35rem 1.4rem;justify-content:center;margin-bottom:1.25rem}
.footer-links a{font-size:.82rem;color:var(--ink-2);transition:color .2s}
.footer-links a:hover{color:var(--brand-deep)}
.copyright{font-size:.75rem;color:#a49eb4}

/* ============ Toast ============ */
.toast{
  position:fixed;left:50%;bottom:2rem;z-index:300;
  transform:translate(-50%,140%);
  max-width:min(90vw,420px);
  padding:.8rem 1.3rem;border-radius:13px;
  background:var(--ink);color:#fff;
  font-size:.85rem;line-height:1.5;text-align:center;
  box-shadow:var(--sh-3);
  opacity:0;visibility:hidden;pointer-events:none;
  transition:transform .4s var(--ease), opacity .3s ease, visibility .3s;
}
.toast.show{
  transform:translate(-50%,0);
  opacity:1;visibility:visible;pointer-events:auto;
}

/* ============ 响应式 ============ */
@media(max-width:900px){
  .nav-links{display:none}
}

@media(max-width:767px){
  .wrap{width:calc(100% - 1.75rem)}
  .page-head{padding:2.5rem 0 1.5rem}
  .page-head h1{font-size:1.75rem}
  .page-head p{font-size:.88rem}
  .doc-section{padding:.25rem 0 2rem}
  .doc-panel{padding:1.25rem;border-radius:var(--r-lg)}
  .doc-body{font-size:.85rem}
  .doc-body h2{font-size:1rem;margin:1.6rem 0 .6rem}
  .doc-meta{font-size:.75rem}
  .doc-meta .date{margin-left:0;width:100%}
  .doc-summary{padding:1rem;font-size:.82rem}
  .toc{padding:1rem}
  .rights-grid{grid-template-columns:1fr}
  .doc-actions{flex-direction:column;align-items:stretch;text-align:center}
  .footer-links{gap:.3rem 1rem}

  /* 手机端：按钮略缩，文字标签仍保留 */
  .lang-switch{
    height:32px;
    padding:0 .7rem;
    gap:.3rem;
    border-radius:9px;
  }
  .lang-switch .ico{width:14px;height:14px}
  .lang-switch .lbl{font-size:.72rem}
}

@media(max-width:380px){
  .wrap{width:calc(100% - 1.25rem)}
  .page-head h1{font-size:1.55rem}
  .doc-body{font-size:.82rem}
  .toc-list a{font-size:.72rem;padding:.28rem .65rem}
  .lang-switch{
    height:30px;
    padding:0 .6rem;
    border-radius:8px;
  }
  .lang-switch .ico{width:13px;height:13px}
  .lang-switch .lbl{font-size:.68rem}
}