/* ==========================================================================
   VPNAY — base.css
   设计令牌 / reset / 排版 / 按钮 / 头部导航 / 页脚 / 通用面板 / reveal
   所有颜色、圆角、字体、阴影一律走 :root 令牌，组件内不散落硬编码值。
   ========================================================================== */

:root{
  /* ---------- 表面层次 ---------- */
  --bg:#3E3D3B;
  --bg-panel:#4A4946;
  --bg-panel-2:#454441;
  --bg-panel-tint:#4E4C48;
  --glass:rgba(62,61,59,.88);
  --border:#55534F;
  --border-strong:#6B6862;
  --grid:rgba(255,255,255,.05);

  /* ---------- 品牌强调色 ---------- */
  --accent:#7C8CF0;
  --accent-dark:#5E6CE0;
  --accent-2:#9AA6F7;
  --accent-08:rgba(124,140,240,.14);
  --accent-10:rgba(124,140,240,.18);
  --accent-22:rgba(124,140,240,.34);

  /* ---------- 文字 ---------- */
  --ink:#F2F1EE;
  --ink-deep:#26251F;
  --ink-04:rgba(255,255,255,.06);
  --muted:#B0AEA8;

  /* ---------- 语义色 ---------- */
  --success:#5FBF8A;
  --success-12:rgba(95,191,138,.16);
  --warn:#E0A63C;
  --warn-12:rgba(224,166,60,.16);
  --error:#E4736A;
  --error-12:rgba(228,115,106,.16);

  /* ---------- 装饰件 ---------- */
  --doodle:#55534F;
  --key:#4A4946;
  --key-edge:#5A5854;
  --reg-hk:#D9736A;
  --reg-us:#6B7FD6;
  --reg-sg:#C99A3A;
  --reg-jp:#D98BA0;
  --reg-ca:#5FA48A;
  --reg-nl:#7A9BC7;
  --flag-red:#C8372D;
  --flag-blue:#2F4A9E;
  --flag-white:#FFFFFF;

  /* ---------- 深墨块（底部 CTA 带 / 页脚） ---------- */
  --deep-text:#FFFFFF;
  --deep-muted:rgba(255,255,255,.68);
  --deep-faint:rgba(255,255,255,.44);
  --deep-line:rgba(255,255,255,.14);
  --deep-line-2:rgba(255,255,255,.08);
  --deep-fill:rgba(255,255,255,.05);
  --deep-hover:rgba(255,255,255,.10);

  /* ---------- 圆角 ---------- */
  --r-sm:6px;
  --r-md:8px;
  --r-lg:12px;
  --r-xl:24px;
  --r-pill:999px;

  /* ---------- 阴影 ---------- */
  --shadow-accent:0 24px 48px rgba(52,68,168,.10);
  --shadow-panel:0 1px 2px rgba(29,30,34,.04),0 12px 32px rgba(52,68,168,.08);
  --shadow-card:0 1px 2px rgba(29,30,34,.03),0 8px 22px rgba(52,68,168,.06);
  --shadow-device:0 30px 60px rgba(29,30,34,.16),0 12px 24px rgba(52,68,168,.12);
  --shadow-cta:0 8px 20px rgba(52,68,168,.22);
  --shadow-menu:0 18px 40px rgba(29,30,34,.14);
  --shadow-float:0 12px 28px rgba(29,30,34,.22);

  /* ---------- 版式与栅格 ---------- */
  --maxw:1200px;
  --gutter:24px;
  --header-h:72px;
  --focus:var(--accent);

  /* ---------- 字体 ---------- */
  --font-display:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --font-hand:'Kaiti SC','STKaiti','KaiTi','Segoe Print','Bradley Hand',cursive;
}

/* ==========================================================================
   reset
   ========================================================================== */
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 24px);
}
html.nav-open{overflow:hidden}
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  color:var(--ink);
  background-color:var(--bg);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:32px 32px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img,svg{max-width:100%}
svg{display:block}
img{height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
table{border-collapse:collapse}
p{margin:0}
ul,ol{margin:0;padding:0}

/* ---------- 键盘焦点可见 ---------- */
:focus-visible{
  outline:2px solid var(--focus);
  outline-offset:2px;
  border-radius:var(--r-sm);
}
.site-foot :focus-visible{outline-color:var(--accent-2)}

/* ==========================================================================
   排版
   ========================================================================== */
h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--ink);
  margin:0;
  line-height:1.18;
  letter-spacing:-.02em;
  overflow-wrap:break-word;
}
h1{font-size:clamp(30px,4.6vw,52px);font-weight:900;line-height:1.12;letter-spacing:-.025em}
h2{font-size:clamp(24px,3vw,34px);font-weight:800}
h3{font-size:clamp(18px,2vw,22px);font-weight:800}
h4{font-size:17px;font-weight:700;letter-spacing:-.01em}
p{line-height:1.7}

.lead{font-size:18px;line-height:1.7;color:var(--muted)}
.small{font-size:13px;color:var(--muted)}
.mono{font-family:var(--font-mono);font-weight:600;color:var(--ink);font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.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;
}

/* 行内代码 / 订阅串：超长不可断串必须在窄屏可折行 */
code,kbd,samp{font-family:var(--font-mono);font-size:.92em}
:not(pre)>code{
  overflow-wrap:anywhere;
  word-break:break-word;
  background:var(--bg-panel-2);
  border:1px solid var(--border);
  border-radius:4px;
  padding:1px 5px;
}
pre{
  margin:0;
  background:var(--ink-deep);
  color:var(--deep-text);
  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;background:none;border:0;padding:0;font-size:13px;line-height:1.7}

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

/* ==========================================================================
   版心与区块节奏（区块只声明纵向 padding，禁止简写覆盖版心左右留白）
   ========================================================================== */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-left:auto;
  margin-right:auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.sec{padding-top:72px;padding-bottom:72px}
.sec-tight{padding-top:48px;padding-bottom:48px}
.sec-head{max-width:760px;margin-bottom:32px}
.sec-kicker{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--muted);
}
.sec-title{margin-top:10px}
.sec-lead{margin-top:14px;font-size:17px;color:var(--muted)}

/* ==========================================================================
   按钮（签名 3：透明底 + 1px 描边小圆角，文字居中）
   ========================================================================== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  border-radius:var(--r-sm);
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  text-align:center;
  white-space:nowrap;
  flex-shrink:0;
  transition:transform .15s,box-shadow .15s,background .15s,border-color .15s;
}
.btn-primary{
  color:var(--bg-panel);
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent-2) 100%);
  border:1px solid transparent;
  box-shadow:var(--shadow-cta);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(52,68,168,.28)}
.btn-ghost{
  color:var(--ink);
  background:transparent;
  border:1px solid var(--ink);
}
.btn-ghost:hover{background:var(--ink-04)}
.btn-quiet{
  color:var(--ink);
  background:var(--bg-panel);
  border:1px solid var(--border);
}
.btn-quiet:hover{border-color:var(--border-strong);background:var(--bg-panel-2)}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-block{width:100%}

/* ==========================================================================
   徽章 / 胶囊 / 标签
   ========================================================================== */
.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:30px;
  padding:0 12px 0 8px;
  border:1px solid var(--border);
  border-radius:var(--r-pill);
  background:var(--bg-panel);
  font-size:13px;
  line-height:1.3;
  color:var(--muted);
  box-shadow:0 1px 2px var(--ink-04);
  max-width:100%;
}
.badge .mono{font-size:12.5px}
.badge-dot{
  flex-shrink:0;
  width:8px;
  height:8px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 0 0 3px var(--accent-08);
}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--border);
  border-radius:var(--r-pill);
  background:var(--bg-panel);
  font-size:12px;
  font-weight:600;
  color:var(--ink);
  max-width:100%;
  overflow:hidden;
}
.chip-row{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;
  align-items:center;
  padding:2px 8px;
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:600;
  line-height:1.5;
  white-space:nowrap;
  max-width:100%;
  overflow:hidden;
}
.tag-iepl{background:var(--accent-10);color:var(--accent)}
.tag-relay{background:var(--warn-12);color:var(--warn)}
.tag-direct{background:var(--success-12);color:var(--success)}
.tag-soft{background:var(--bg-panel-2);color:var(--muted)}

/* ==========================================================================
   通用面板 / 卡片
   ========================================================================== */
.panel{
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-card);
  padding:24px;
  min-width:0;
}
.card{
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-card);
  padding:22px;
  min-width:0;
  transition:transform .18s,box-shadow .18s,border-color .18s;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-panel);border-color:var(--border-strong)}
.card-title{font-size:17px;font-weight:800;letter-spacing:-.01em}
.card p{margin-top:8px;font-size:14.5px;color:var(--muted)}

/* ==========================================================================
   头部导航（由 header.js 运行时注入）
   ========================================================================== */
.top{
  position:sticky;
  top:0;
  z-index:20;
  height:var(--header-h);
  border-bottom:1px solid var(--border);
  background:rgba(247,247,245,.86);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.top-in{
  position:relative;
  max-width:var(--maxw);
  height:100%;
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
  display:flex;
  align-items:center;
  gap:20px;
}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-logo{width:28px;height:28px;display:block}
.brand-en{
  font-family:var(--font-display);
  font-weight:800;
  font-size:19px;
  letter-spacing:-.02em;
  color:var(--ink);
  white-space:nowrap;
}
.brand-zh{
  font-size:14px;
  font-weight:500;
  color:var(--muted);
  white-space:nowrap;
}

.nav{margin-left:auto}
.nav-list{
  display:flex;
  align-items:center;
  gap:6px;
  list-style:none;
  margin:0;
  padding:0;
}
.nav-list a,.nav-btn{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 12px;
  font-size:15px;
  font-weight:500;
  color:var(--ink);
  border-radius:var(--r-sm);
  line-height:20px;
  white-space:nowrap;
}
.nav-list a:hover,.nav-btn:hover{background:var(--ink-04)}
.nav-list a.is-active{font-weight:700}
.nav-list a.is-active::after{
  content:'';
  position:absolute;
  left:12px;
  right:12px;
  bottom:-17px;
  height:2px;
  background:var(--accent);
}
.nav-btn .chev{width:10px;height:10px;flex-shrink:0}

.more{position:relative}
.menu{
  position:absolute;
  top:calc(100% + 14px);
  left:0;
  min-width:188px;
  margin:0;
  padding:6px;
  list-style:none;
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-panel);
  opacity:0;
  visibility:hidden;
  transform:translateY(-4px);
  transition:opacity .16s,transform .16s,visibility .16s;
}
.more:hover .menu,
.more:focus-within .menu,
.more.is-open .menu{opacity:1;visibility:visible;transform:translateY(0)}
.menu a{display:flex;width:100%;padding:9px 12px;font-size:14px;border-radius:var(--r-sm)}

.tools{
  display:flex;
  align-items:center;
  gap:12px;
  margin-left:8px;
  padding-left:16px;
  border-left:1px solid var(--border);
}
.lang-wrap{position:relative}
.lang{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  min-height:36px;
  padding:8px 10px;
  font-size:14px;
  color:var(--muted);
  border-radius:var(--r-sm);
  white-space:nowrap;
}
.lang:hover{background:var(--ink-04)}
.lang .chev{width:10px;height:10px;flex-shrink:0}
.lang-menu{
  position:absolute;
  top:calc(100% + 10px);
  right:0;
  min-width:160px;
  margin:0;
  padding:6px;
  list-style:none;
  background:var(--bg-panel);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-menu);
  opacity:0;
  visibility:hidden;
  transform:translateY(-4px);
  transition:opacity .16s,transform .16s,visibility .16s;
}
.lang-wrap.is-open .lang-menu{opacity:1;visibility:visible;transform:translateY(0)}
.lang-menu a{display:flex;width:100%;align-items:center;min-height:38px;padding:8px 12px;font-size:14px;border-radius:var(--r-sm)}
.lang-menu a:hover{background:var(--ink-04)}
.lang-menu a[aria-current="true"]{color:var(--accent);font-weight:700}

.btn-login{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:38px;
  padding:0 16px;
  border:1px solid var(--ink);
  border-radius:var(--r-sm);
  font-size:14px;
  font-weight:600;
  color:var(--ink);
  background:transparent;
  white-space:nowrap;
  transition:background .15s;
}
.btn-login:hover{background:var(--ink-04)}

.burger{
  display:none;
  width:44px;
  height:44px;
  min-width:44px;
  min-height:44px;
  align-items:center;
  justify-content:center;
  border:1px solid var(--border);
  border-radius:var(--r-sm);
  background:var(--bg-panel);
}
.burger span{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:var(--ink);
  border-radius:2px;
}
.burger span::before,.burger span::after{
  content:'';
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:var(--ink);
  border-radius:2px;
}
.burger span::before{top:-6px}
.burger span::after{top:6px}
.burger[aria-expanded="true"] span{background:transparent}
.burger[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.burger[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

.drawer{display:none}

/* ==========================================================================
   页脚（深墨局部深块 + 极细虚线弧装饰）
   ========================================================================== */
.site-foot{
  position:relative;
  overflow-x:clip;
  margin-top:80px;
  background:var(--ink-deep);
  color:var(--deep-muted);
  padding-top:64px;
  padding-bottom:28px;
}
.site-foot::before,
.site-foot::after{
  content:'';
  position:absolute;
  left:50%;
  transform:translateX(-50%);
  border:1px dashed var(--deep-line);
  border-radius:50%;
  pointer-events:none;
}
.site-foot::before{top:-190px;width:min(1080px,150%);height:420px}
.site-foot::after{top:-70px;width:min(720px,120%);height:300px;border-color:var(--deep-line-2)}
.foot-in{
  position:relative;
  z-index:1;
  max-width:var(--maxw);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
  display:grid;
  grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) minmax(0,1.2fr) minmax(0,.8fr);
  gap:32px;
}
.foot-brand{min-width:0}
.foot-logo{display:inline-flex;align-items:center;gap:10px}
.foot-logo img{width:26px;height:26px}
.foot-logo span{
  font-family:var(--font-display);
  font-weight:800;
  font-size:18px;
  letter-spacing:-.02em;
  color:var(--deep-text);
}
.foot-brand p{margin-top:14px;font-size:13.5px;line-height:1.7;color:var(--deep-muted);max-width:32em}
.foot-h{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--deep-faint);
  margin-bottom:14px;
}
.foot-list{list-style:none;display:grid;gap:9px}
.foot-list a{font-size:13.5px;color:var(--deep-muted);display:inline-flex;align-items:center;min-height:24px}
.foot-list a:hover{color:var(--deep-text)}
.foot-tags{list-style:none;display:flex;flex-wrap:wrap;gap:8px}
.foot-tags a{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  padding:4px 10px;
  border:1px solid var(--deep-line);
  border-radius:var(--r-pill);
  font-size:12.5px;
  color:var(--deep-muted);
  background:var(--deep-fill);
}
.foot-tags a:hover{color:var(--deep-text);border-color:var(--deep-hover);background:var(--deep-hover)}
.foot-lang-list{list-style:none;display:grid;gap:9px}
.foot-lang-list a{font-size:13.5px;color:var(--deep-muted);display:inline-flex;align-items:center;min-height:24px}
.foot-lang-list a:hover{color:var(--deep-text)}
.foot-base{
  position:relative;
  z-index:1;
  max-width:var(--maxw);
  margin:44px auto 0;
  padding:20px var(--gutter) 0;
  border-top:1px solid var(--deep-line-2);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 24px;
  font-size:12.5px;
  color:var(--deep-faint);
}
.foot-legal{list-style:none;display:flex;flex-wrap:wrap;gap:8px 18px;margin-left:auto}
.foot-legal a{color:var(--deep-faint);display:inline-flex;align-items:center;min-height:24px}
.foot-legal a:hover{color:var(--deep-text)}

/* 悬浮 CTA 存在时给页尾留出等高垫块，避免浮标压住页脚法律链 */
body:has(.float-cta)::after{
  content:'';
  display:block;
  height:calc(88px + env(safe-area-inset-bottom,0px));
}

/* ==========================================================================
   滚动淡入（可见性默认可见，隐藏态由 .pending 承担；JS 只加分拣）
   ========================================================================== */
.reveal{transition:opacity .5s ease,transform .5s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}

/* ==========================================================================
   服务器状态容器：必须夹住网格（文档流占位 + overflow:hidden）
   ========================================================================== */
#server-status{
  display:block;
  position:static;
  overflow:hidden;
  max-width:100%;
  margin:0 0 40px;
}
#server-status table{max-width:100%}

/* ==========================================================================
   窄屏防御
   ========================================================================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  .card:hover{transform:none}
  .btn-primary:hover{transform:none}
}

@media (max-width:1024px){
  .foot-in{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr) minmax(0,1fr)}
  .foot-lang{grid-column:1 / -1}
  .foot-lang-list{display:flex;flex-wrap:wrap;gap:8px 20px}
}

@media (max-width:768px){
  .nav{display:none}
  .tools{margin-left:auto;padding-left:0;border-left:0;gap:8px}
  .lang-wrap{display:none}
  .burger{display:inline-flex}
  .drawer{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    z-index:40;
    background:var(--bg-panel);
    border-bottom:1px solid var(--border);
    box-shadow:var(--shadow-menu);
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    overscroll-behavior:contain;
    -webkit-overflow-scrolling:touch;
    padding:10px var(--gutter) 20px;
  }
  .drawer.is-open{display:block}
  .drawer-list{list-style:none;margin:0;padding:0}
  .drawer-list a{
    display:flex;
    width:100%;
    align-items:center;
    min-height:48px;
    padding:12px;
    border-radius:var(--r-sm);
    font-size:16px;
    font-weight:600;
    color:var(--ink);
  }
  .drawer-list a:hover{background:var(--ink-04)}
  .drawer-list a.is-active{color:var(--accent)}
  .drawer-sep{height:1px;background:var(--border);margin:10px 0}
  .drawer-h{
    font-family:var(--font-mono);
    font-size:11px;
    letter-spacing:.08em;
    text-transform:uppercase;
    color:var(--muted);
    padding:6px 12px 2px;
  }
  .foot-in{grid-template-columns:minmax(0,1fr);gap:28px}
  .foot-legal{margin-left:0}
  .sec{padding-top:56px;padding-bottom:56px}
}

@media (max-width:640px){
  .no-break{white-space:normal}
  /* 装饰性微倾斜在窄屏一律归零，防止包围盒横向溢出 */
  .tilt,.tilt-1,.tilt-2{transform:none}
  .btn{height:46px;padding:0 20px;font-size:14.5px}
  h1{letter-spacing:-.02em}
}

@media (max-width:400px){
  :root{--gutter:16px}
}