/* ==========================================================================
   VPNBF — base.css
   设计令牌 / reset / 排版 / 按钮 / 头部 / 页脚 / 通用卡片 / reveal / 响应式
   风格:暖纸上的接通窗口
   ========================================================================== */

:root{
  /* ---- 基底与面板 ---- */
  --bg:#FBF3EA;
  --bg-panel:#FFFCF8;
  --bg-panel2:#F4E8DC;
  --border:#E8DACB;

  /* ---- 强调色 ---- */
  --accent:#3A2740;
  --accent-dark:#241628;

  /* ---- 文字 ---- */
  --text:#2A211E;
  --text-muted:#7A6A60;

  /* ---- 语义色 ---- */
  --success:#3F8F5E;
  --warn:#C9891C;
  --error:#B9433A;

  /* ---- 彩虹柔光伴色 ---- */
  --peach-top:#F6DCC8;
  --peach:#F6C9A8;
  --lilac:#D9C3EE;
  --sky:#BFDDF0;
  --cream:#F3E4B2;
  --ink-peach:#DE9C74;
  --ink-lilac:#9F7DCF;
  --ink-sky:#6B9FCB;

  /* ---- 旗帜色(仅用于内联 SVG 小旗) ---- */
  --flag-red:#D8232A;
  --flag-blue:#2C3E8F;
  --flag-white:#FFFFFF;
  --flag-black:#1C1C1C;
  --flag-gold:#F2C234;

  /* ---- 通道值(供 rgba 使用) ---- */
  --ink-rgb:58,39,64;
  --paper-rgb:255,252,248;

  /* ---- 字体栈 ---- */
  --font-display:"Songti SC","Noto Serif CJK SC","Source Han Serif SC","Noto Serif SC",Georgia,"Times New Roman",serif;
  --font-body:Inter,"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  /* ---- 圆角 ---- */
  --r-xl:24px;
  --r-lg:20px;
  --r-md:14px;
  --r-sm:10px;
  --r-pill:999px;

  /* ---- 阴影(带色柔影) ---- */
  --shadow-window:0 32px 48px -18px rgba(var(--ink-rgb),.10),0 10px 24px -12px rgba(var(--ink-rgb),.08);
  --shadow-float:0 18px 36px -14px rgba(var(--ink-rgb),.14),0 4px 12px -6px rgba(var(--ink-rgb),.08);
  --shadow-card:0 14px 30px -18px rgba(var(--ink-rgb),.16),0 3px 10px -6px rgba(var(--ink-rgb),.07);
  --highlight:inset 0 0 0 1px rgba(var(--paper-rgb),.85);

  /* ---- 节奏 ---- */
  --gutter:24px;
  --sec-y:76px;
  --header-h:68px;
  --measure:66ch;
}

/* ============================ reset ============================ */

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

html{
  margin:0;padding:0;
  min-height:100%;
  background:linear-gradient(180deg,var(--peach-top) 0%,var(--bg) 46%,var(--bg-panel) 100%);
  background-attachment:fixed;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 16px);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;padding:0;
  font-family:var(--font-body);
  color:var(--text);
  font-size:15px;
  line-height:1.6;
  min-height:100vh;
  overflow-x:clip;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

html.nav-open{overflow:hidden}

img,svg,video{max-width:100%}
svg{display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0;padding:0}
li{list-style:none}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
table{border-collapse:collapse;border-spacing:0}

hr{border:0;border-top:1px solid var(--border);margin:32px 0}

/* 行内 code:超长订阅串必须就地可断,否则 375px 必破 */
code,kbd,samp{
  font-family:var(--font-mono);
  font-size:.92em;
  overflow-wrap:anywhere;
  word-break:break-word;
}

pre{
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.7;
  background:var(--bg-panel2);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  padding:16px 18px;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  max-width:100%;
}
pre code{overflow-wrap:normal;word-break:normal;white-space:pre}

/* ============================ 版心与区块 ============================ */

.wrap{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
  position:relative;
  min-width:0;
}
.wrap.narrow{max-width:880px}
.wrap.wide{max-width:1320px}

/* 区块节奏:只声明纵向,禁止 padding 简写覆盖版心左右留白 */
.sec{padding-top:var(--sec-y);padding-bottom:var(--sec-y)}
.sec-sm{padding-top:42px;padding-bottom:42px}
.sec-tight{padding-top:52px;padding-bottom:52px}

.grain{
  position:fixed;inset:0;width:100%;height:100%;
  pointer-events:none;z-index:0;opacity:.9;
}
.sr-defs{position:absolute;width:0;height:0;overflow:hidden}
.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;
}

/* ============================ 排版 ============================ */

h1,h2,h3,h4{font-family:var(--font-display);font-weight:400;color:var(--text)}

h1{
  font-size:clamp(52px,5vw,64px);
  line-height:1.12;
  letter-spacing:-.02em;
  text-wrap:balance;
}
h2{
  font-size:clamp(30px,3.2vw,42px);
  line-height:1.2;
  letter-spacing:-.015em;
  text-wrap:balance;
}
h3{
  font-size:clamp(20px,1.8vw,24px);
  line-height:1.32;
  letter-spacing:-.01em;
}
h4{font-size:17px;line-height:1.4;font-weight:600;font-family:var(--font-body)}

.lead{
  font-size:17px;
  line-height:1.65;
  color:var(--text-muted);
  max-width:var(--measure);
}
p{max-width:var(--measure)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);letter-spacing:-.01em}
.center{text-align:center}
.center p,.center .lead{margin-left:auto;margin-right:auto}

.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-muted);
}

/* 中文关键词防断词:只包 2~4 个汉字 */
.no-break{white-space:nowrap}

/* 文字渐变关键词 */
.grad-word{
  background:linear-gradient(92deg,var(--ink-peach) 0%,var(--ink-lilac) 52%,var(--ink-sky) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  padding-right:.02em;
}

/* 章节头 */
.sec-head{display:flex;flex-direction:column;gap:14px;margin-bottom:36px}
.sec-head.center{align-items:center;text-align:center}
.sec-head .kicker{align-self:flex-start}
.sec-head.center .kicker{align-self:center}

/* ============================ 按钮 ============================ */

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  min-height:50px;padding:0 26px;border-radius:var(--r-pill);
  font-size:15.5px;font-weight:500;letter-spacing:.01em;
  border:1px solid transparent;
  transition:transform .15s,box-shadow .15s,background .15s,color .15s,border-color .15s;
  white-space:nowrap;
  flex-shrink:0;
}
.btn svg{width:18px;height:18px;flex:none}

.btn-primary{
  background:var(--accent);color:var(--bg-panel);
  box-shadow:0 14px 28px -12px rgba(var(--ink-rgb),.45);
}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}

.btn-ghost{
  background:rgba(var(--paper-rgb),.55);color:var(--accent);
  border-color:var(--accent);
}
.btn-ghost:hover{background:var(--bg-panel)}

.btn-secondary{
  background:var(--bg-panel);color:var(--accent);
  border-color:var(--border);
  box-shadow:var(--highlight);
  flex-shrink:0;white-space:nowrap;
}
.btn-secondary:hover{border-color:var(--accent)}

.btn-sm{min-height:40px;padding:0 18px;font-size:14px}
.btn-lg{min-height:56px;padding:0 32px;font-size:16.5px}
.btn-block{width:100%}

.cta-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}

/* ============================ 徽标 / 胶囊 / 标签 ============================ */

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  min-height:26px;padding:2px 12px 2px 10px;border-radius:var(--r-pill);
  font-size:12.5px;letter-spacing:.08em;color:var(--text-muted);
  background:rgba(var(--paper-rgb),.7);
  border:1px solid var(--border);
  box-shadow:var(--highlight);
}
.eyebrow i{
  width:7px;height:7px;border-radius:50%;background:var(--success);
  box-shadow:0 0 0 3px rgba(63,143,94,.16);
  flex-shrink:0;
}

.pill-ink{
  display:inline-flex;align-items:center;gap:7px;
  min-height:28px;padding:2px 12px;border-radius:var(--r-pill);
  background:var(--accent);color:var(--bg-panel);
  font-size:12.5px;font-weight:500;letter-spacing:.02em;
  box-shadow:0 8px 16px -10px rgba(var(--ink-rgb),.5);
}
.pill-ink .mono{font-family:var(--font-mono);font-size:12.5px}
.pill-ink svg{width:13px;height:13px;flex:none}

.pill-soft{
  display:inline-flex;align-items:center;gap:7px;
  min-height:28px;padding:2px 12px;border-radius:var(--r-pill);
  background:var(--bg-panel2);color:var(--accent);
  border:1px solid var(--border);
  font-size:12.5px;letter-spacing:.02em;
}
.pill-soft svg{width:13px;height:13px;flex:none}

/* 渲染自数据的 nowrap 徽章必须自带宽度防御 */
.chip{
  display:inline-flex;align-items:center;gap:6px;
  max-width:100%;overflow:hidden;
  min-height:26px;padding:2px 11px;border-radius:var(--r-pill);
  font-size:12.5px;white-space:nowrap;text-overflow:ellipsis;
  background:var(--bg-panel2);color:var(--text-muted);
  border:1px solid var(--border);
}
.chip.is-active{background:var(--accent);color:var(--bg-panel);border-color:var(--accent)}
.chip svg{width:13px;height:13px;flex:none}

.dot-state{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12.5px;color:var(--success);white-space:nowrap;
}
.dot-state i{
  width:7px;height:7px;border-radius:50%;background:var(--success);
  box-shadow:0 0 0 3px rgba(63,143,94,.14);
  flex-shrink:0;
}

/* ============================ 头部导航 ============================ */

.top{
  position:relative;z-index:40;
  min-height:var(--header-h);
  border-bottom:1px solid var(--border);
}
/* Frosted backing sits on a pseudo-element: backdrop-filter on .top itself would
   turn .top into a containing block for fixed descendants, and the drawer (which
   lives inside the header) would then scroll away with the page. */
.top::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:rgba(var(--paper-rgb),.72);
  backdrop-filter:blur(10px);
}
.top .wrap{
  min-height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;min-width:0}
.brand img{width:32px;height:32px;border-radius:9px;flex:none}
.brand-word{
  font-family:var(--font-display);font-size:22px;letter-spacing:.01em;
  line-height:1;color:var(--text);white-space:nowrap;
}
.brand-zh{
  font-size:13px;color:var(--text-muted);letter-spacing:.04em;
  line-height:1;white-space:nowrap;
}
.brand-sub{
  font-size:12.5px;color:var(--text-muted);letter-spacing:.06em;
  padding-left:10px;border-left:1px solid var(--border);line-height:1;
  white-space:nowrap;
}

/* 导航 ul 自身必须 flex,否则 li 逐行堆成竖列 */
.nav-links{
  display:flex;align-items:center;gap:26px;
  list-style:none;margin:0;padding:0;
  height:100%;
}
.nav-links > li{display:flex;align-items:center;height:100%}
.nav-links a{
  position:relative;display:flex;align-items:center;
  height:var(--header-h);
  font-size:14px;color:var(--text-muted);letter-spacing:.01em;
  transition:color .15s;white-space:nowrap;
}
.nav-links a:hover{color:var(--text)}
.nav-links a[aria-current="page"]{color:var(--text)}
.nav-links a[aria-current="page"]::after{
  content:"";position:absolute;left:0;right:0;bottom:14px;height:2px;border-radius:2px;
  background:var(--accent);
}

.top-tools{display:flex;align-items:center;gap:14px;flex-shrink:0}
.lang{position:relative}
.lang-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-height:36px;min-width:44px;padding:0 12px;border-radius:var(--r-pill);
  font-size:13.5px;color:var(--text-muted);
  border:1px solid transparent;
  transition:color .15s,border-color .15s;
}
.lang-btn:hover{color:var(--text);border-color:var(--border)}
.lang-btn svg{width:12px;height:12px;flex:none}
.lang-btn span{white-space:nowrap}
.lang-menu{
  position:absolute;top:calc(100% + 8px);right:0;z-index:60;
  min-width:170px;padding:6px;
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-card);
  display:none;
}
.lang-menu[data-open="true"]{display:block}
.lang-menu a{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  min-height:40px;padding:0 12px;border-radius:var(--r-sm);
  font-size:13.5px;color:var(--text);
}
.lang-menu a:hover{background:var(--bg-panel2)}
.lang-menu a[aria-current="true"]{color:var(--text-muted)}
.lang-menu .code{font-family:var(--font-mono);font-size:11.5px;color:var(--text-muted)}

.login-btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:38px;padding:0 18px;border-radius:var(--r-pill);
  border:1px solid var(--accent);color:var(--accent);
  font-size:14px;font-weight:500;background:rgba(var(--paper-rgb),.55);
  transition:background .15s,color .15s;white-space:nowrap;flex-shrink:0;
}
.login-btn:hover{background:var(--accent);color:var(--bg-panel)}

.burger{
  display:none;
  align-items:center;justify-content:center;
  min-width:44px;min-height:44px;
  border-radius:var(--r-sm);
  border:1px solid var(--border);
  color:var(--accent);
  background:rgba(var(--paper-rgb),.6);
}
.burger svg{width:20px;height:20px}
.burger .icon-close{display:none}
.burger[aria-expanded="true"] .icon-close{display:block}
.burger[aria-expanded="true"] .icon-open{display:none}

/* 抽屉:实色背景,链接整行可点 */
.drawer{
  display:none;
  position:fixed;left:0;right:0;top:var(--header-h);z-index:35;
  background:var(--bg-panel);
  border-bottom:1px solid var(--border);
  box-shadow:var(--shadow-card);
  max-height:calc(100dvh - var(--header-h));
  overflow-y:auto;
  overscroll-behavior:contain;
  padding:10px var(--gutter) 22px;
}
.drawer[data-open="true"]{display:block}
.drawer ul{list-style:none;margin:0;padding:0}
.drawer a{
  display:flex;align-items:center;width:100%;
  min-height:48px;padding:10px 4px;
  font-size:15px;color:var(--text);
  border-bottom:1px solid var(--border);
}
.drawer a[aria-current="page"]{color:var(--accent);font-weight:600}
.drawer .drawer-lang{padding-top:14px}
.drawer .drawer-lang h3{
  font-family:var(--font-body);font-size:12px;font-weight:600;
  letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);
  margin-bottom:6px;
}
.drawer .drawer-lang a{font-size:14px;min-height:44px}
.drawer-veil{
  display:none;position:fixed;inset:0;z-index:30;
  background:rgba(var(--ink-rgb),.28);
}
.drawer-veil[data-open="true"]{display:block}

/* ============================ 通用卡片 / 面板 ============================ */

.card{
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-xl);
  box-shadow:var(--highlight),var(--shadow-card);
  padding:26px;
  min-width:0;
}
.card-flat{
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  box-shadow:var(--highlight);
  padding:22px;
  min-width:0;
}
.card-tint{
  background:var(--bg-panel2);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:22px;
  min-width:0;
}

.grid{display:grid;gap:20px;min-width:0}
.grid > *{min-width:0}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* 彩虹柔光渐变面 */
.aura{
  position:relative;border-radius:var(--r-lg);overflow:hidden;min-height:100%;
  background:
    radial-gradient(60% 46% at 16% 12%,var(--peach) 0%,rgba(246,201,168,0) 72%),
    radial-gradient(56% 52% at 88% 34%,var(--lilac) 0%,rgba(217,195,238,0) 72%),
    radial-gradient(62% 54% at 22% 82%,var(--sky) 0%,rgba(191,221,240,0) 72%),
    radial-gradient(60% 50% at 88% 92%,var(--cream) 0%,rgba(243,228,178,0) 74%),
    linear-gradient(140deg,var(--peach) 0%,var(--lilac) 40%,var(--sky) 70%,var(--cream) 100%);
  box-shadow:inset 0 0 40px 12px rgba(var(--paper-rgb),.55);
}
.aura-peach{
  background:
    radial-gradient(62% 58% at 20% 18%,var(--peach) 0%,rgba(246,201,168,0) 74%),
    linear-gradient(150deg,var(--cream) 0%,var(--peach) 100%);
}
.aura-lilac{
  background:
    radial-gradient(60% 56% at 78% 22%,var(--lilac) 0%,rgba(217,195,238,0) 74%),
    linear-gradient(150deg,var(--peach) 0%,var(--lilac) 100%);
}
.aura-sky{
  background:
    radial-gradient(60% 56% at 24% 76%,var(--sky) 0%,rgba(191,221,240,0) 74%),
    linear-gradient(150deg,var(--lilac) 0%,var(--sky) 100%);
}
.aura-cream{
  background:
    radial-gradient(58% 54% at 82% 74%,var(--cream) 0%,rgba(243,228,178,0) 76%),
    linear-gradient(150deg,var(--sky) 0%,var(--cream) 100%);
}

/* 渐变面上的深色胶囊标签 */
.aura-tags{
  position:absolute;left:14px;right:14px;bottom:14px;
  display:flex;flex-wrap:wrap;gap:8px;
}
.tag{
  display:inline-flex;align-items:center;gap:7px;
  max-width:100%;
  min-height:30px;padding:4px 13px 4px 11px;border-radius:12px;
  background:var(--accent);color:var(--bg-panel);
  font-size:12.5px;font-weight:500;letter-spacing:.02em;
  box-shadow:0 10px 20px -10px rgba(var(--ink-rgb),.55),inset 0 1px 0 rgba(var(--paper-rgb),.12);
}
.tag svg{width:13px;height:13px;flex:none}
.tag .mono{font-family:var(--font-mono);font-size:12px}

/* 图标横排(灰度) */
.icon-row{
  display:flex;align-items:center;flex-wrap:wrap;gap:10px 20px;
}
.icon-item{
  display:inline-flex;align-items:center;gap:7px;
  font-size:12.5px;color:var(--text-muted);letter-spacing:.02em;
  filter:grayscale(1);opacity:.78;
  transition:filter .2s,opacity .2s,color .2s;
}
.icon-item:hover{filter:none;opacity:1;color:var(--text)}
.icon-item svg{width:18px;height:18px;flex:none}
.icon-item.flag svg{width:20px;height:20px;border-radius:50%;box-shadow:0 0 0 1px rgba(var(--ink-rgb),.08)}
.icon-sep{width:1px;height:20px;background:var(--border);flex:none}

/* ============================ 页脚 ============================ */

.foot{
  position:relative;z-index:1;
  margin-top:0;
  background:var(--accent);
  color:rgba(255,252,248,.78);
  padding-top:56px;
  padding-bottom:28px;
  overflow-x:clip;
}
.foot a{color:rgba(255,252,248,.78);transition:color .15s}
.foot a:hover{color:var(--bg-panel)}
.foot-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.2fr;
  gap:32px;
  min-width:0;
}
.foot-grid > *{min-width:0}
.foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.foot-brand img{width:30px;height:30px;border-radius:8px;flex:none}
.foot-brand b{font-family:var(--font-display);font-size:20px;font-weight:400;color:var(--bg-panel)}
.foot-about{font-size:13.5px;line-height:1.7;max-width:34ch;color:rgba(255,252,248,.66)}
.foot h3{
  font-family:var(--font-body);font-size:12px;font-weight:600;
  letter-spacing:.12em;text-transform:uppercase;
  color:rgba(255,252,248,.55);
  margin-bottom:14px;
}
.foot ul{display:flex;flex-direction:column;gap:10px}
.foot ul a{font-size:13.5px;display:inline-block;padding:2px 0}
.foot-terms{display:flex;flex-wrap:wrap;gap:8px}
.foot-terms a{
  display:inline-flex;align-items:center;
  min-height:30px;padding:2px 11px;border-radius:var(--r-pill);
  border:1px solid rgba(255,252,248,.22);
  font-size:12.5px;
}
.foot-terms a:hover{border-color:rgba(255,252,248,.5)}
.foot-langs{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.foot-langs a{
  display:inline-flex;align-items:center;
  min-height:30px;padding:2px 11px;border-radius:var(--r-pill);
  background:rgba(var(--paper-rgb),.08);
  font-size:12.5px;
}
.foot-bottom{
  margin-top:40px;padding-top:20px;
  border-top:1px solid rgba(255,252,248,.16);
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
  font-size:12.5px;color:rgba(255,252,248,.55);
}

/* ============================ reveal 滚动淡入 ============================ */

.reveal{transition:opacity .55s ease,transform .55s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}

/* ============================ 悬浮 CTA ============================ */

.float-cta{
  position:fixed;right:28px;bottom:28px;z-index:20;
  display:inline-flex;align-items:center;gap:8px;
  min-height:46px;padding:0 20px 0 16px;border-radius:var(--r-pill);
  background:var(--accent);color:var(--bg-panel);
  font-size:14px;font-weight:500;letter-spacing:.02em;
  box-shadow:0 16px 30px -12px rgba(var(--ink-rgb),.5);
}
.float-cta svg{width:16px;height:16px;flex:none}
.float-cta:hover{background:var(--accent-dark)}

/* 页尾避让:浮标不压正文段尾与页脚法律链 */
body:has(.float-cta)::after{
  content:"";display:block;
  height:calc(88px + env(safe-area-inset-bottom,0px));
}

/* ============================ 焦点可见 ============================ */

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
  border-radius:var(--r-sm);
}
.foot a:focus-visible{outline-color:var(--bg-panel)}

/* ============================ 防溢出硬规则 ============================ */

/* 装饰性微倾斜不许作用在长内容容器上 */
.tilt{transform:rotate(-1.2deg)}
.tilt-r{transform:rotate(1.2deg)}

/* 绝对定位装饰所在区块 */
.deco-host{position:relative;overflow-x:clip;max-width:100%}

/* server-status 必须夹住网格 */
#server-status{
  display:block;
  position:relative;
  overflow:hidden;
  max-width:100%;
  margin-top:20px;
  margin-bottom:20px;
  min-height:120px;
}
#server-status > *{max-width:100%;min-width:0}

.hscroll{
  overflow-x:auto;
  max-width:100%;
  -webkit-overflow-scrolling:touch;
}

/* ============================ 响应式 ============================ */

@media (max-width:1100px){
  .nav-links{gap:18px}
  .brand-sub{display:none}
  .foot-grid{grid-template-columns:1.4fr 1fr 1fr;gap:28px}
}

@media (max-width:900px){
  :root{--gutter:20px}
  .nav-links{display:none}
  .burger{display:inline-flex}
  /* 工具区在窄屏必须自己贴右 */
  .top-tools{margin-left:auto}
  .foot-grid{grid-template-columns:1fr 1fr;gap:26px}
}

@media (max-width:768px){
  :root{--gutter:18px;--sec-y:56px}
  h1{font-size:clamp(30px,7.4vw,40px);line-height:1.16}
  h2{font-size:clamp(24px,5.6vw,32px)}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .tilt,.tilt-r{transform:none}
  .card{padding:20px;border-radius:var(--r-lg)}
  .foot-grid{grid-template-columns:minmax(0,1fr)}
  .float-cta{right:16px;bottom:16px}
}

@media (max-width:640px){
  :root{--gutter:16px}
  /* 窄屏允许关键词组折行 */
  .no-break{white-space:normal}
  .lead{font-size:15.5px}
  .cta-row{flex-direction:column;align-items:stretch;width:100%}
  .cta-row .btn{width:100%}
  .brand-zh{display:none}
  .top .wrap{gap:8px}
  .top-tools{gap:8px}
  .lang-btn{padding:0 8px}
  .login-btn{padding:0 12px}
  .icon-row{gap:8px 14px}
  .foot{padding-top:44px}
}

@media (max-width:400px){
  :root{--gutter:16px}
  h1{font-size:30px}
}

@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,.reveal.pending{opacity:1;transform:none}
}

/* 打印友好 */
@media print{
  .top,.foot,.float-cta,.drawer,.drawer-veil{display:none !important}
  body{background:#fff}
}