/* ==========================================================================
   VPNYN · base.css
   设计令牌 / reset / 排版 / 按钮 / 头部 / 页脚 / 通用面板 / 可见性体系
   ========================================================================== */

:root{
  /* --- 基底与面板 --- */
  --bg:#FAF2E6;
  --bg-top:#FDF8EE;
  --bg-bottom:#F3E9D6;
  --panel:#FFFCF8;
  --panel-2:#F2E7D3;
  --border:#E6D9C0;
  --border-soft:rgba(230,217,192,.62);
  --border-strong:rgba(230,217,192,.95);

  /* --- 强调色（主色 + 四枚糖果色） --- */
  --accent:#D2551F;
  --accent-dark:#9C3610;
  --amber:#E3A72F;
  --coral:#DE8B85;
  --sage:#7FA678;
  --mist:#6E8FB8;

  /* --- 语义色 --- */
  --success:#2F7D4F;
  --warn:#C98A12;
  --error:#A32B22;

  /* --- 文本 --- */
  --text:#2A2018;
  --muted:#6E6152;

  /* --- 主色透明阶（描线 / 柔影 / 光斑） --- */
  --accent-00:rgba(210,85,31,0);
  --accent-06:rgba(210,85,31,.06);
  --accent-08:rgba(210,85,31,.08);
  --accent-10:rgba(210,85,31,.10);
  --accent-14:rgba(210,85,31,.14);
  --accent-16:rgba(210,85,31,.16);
  --accent-24:rgba(210,85,31,.24);
  --accent-40:rgba(210,85,31,.40);
  --amber-08:rgba(227,167,47,.08);
  --amber-10:rgba(227,167,47,.10);
  --amber-16:rgba(227,167,47,.16);
  --amber-24:rgba(227,167,47,.24);
  --halo-warm:rgba(246,217,122,.62);
  --halo-warm-2:rgba(227,167,47,.20);
  --ink-06:rgba(42,32,24,.06);
  --ink-08:rgba(42,32,24,.08);
  --ink-12:rgba(42,32,24,.12);
  --grain-dot:rgba(42,32,24,.030);
  --topbar-bg:rgba(253,248,238,.90);
  --white-70:rgba(255,255,255,.72);
  --scrim:rgba(42,32,24,.34);
  --success-12:rgba(47,125,79,.12);
  --success-30:rgba(47,125,79,.30);
  --sage-14:rgba(127,166,120,.16);
  --mist-14:rgba(110,143,184,.16);
  --coral-14:rgba(222,139,133,.18);

  /* --- 糖果色底板上的图标前景色 --- */
  --on-amber:#8A5A0B;
  --on-coral:#A44A43;
  --on-sage:#3F6B3A;
  --on-mist:#38567F;

  /* --- 旗帜色（内容色，集中登记） --- */
  --flag-white:#FFFFFF;
  --flag-red:#C8102E;
  --flag-jp:#BC002D;
  --flag-uk-blue:#012169;
  --flag-uk-red:#C8102E;
  --flag-us-blue:#3C3B6E;
  --flag-us-red:#B22234;
  --flag-it-green:#008C45;
  --flag-it-red:#CD212A;

  /* --- 柔影（带色，非灰影） --- */
  --shadow-card:0 12px 26px -16px var(--accent-24), 0 2px 6px -3px var(--ink-08);
  --shadow-chip:0 8px 18px -12px var(--accent-24), 0 1px 3px -1px var(--ink-06);
  --shadow-window:0 42px 80px -46px var(--accent-40), 0 14px 34px -22px var(--ink-12);
  --shadow-knob:0 1px 3px var(--ink-12);
  --shadow-cta:0 14px 28px -14px var(--accent-40);
  --shadow-lift:0 22px 42px -22px var(--accent-24), 0 4px 12px -6px var(--ink-12);
  --shadow-inner-hi:inset 0 1px 0 var(--white-70);

  /* --- 圆角 --- */
  --r-xs:8px;
  --r-sm:10px;
  --r-md:14px;
  --r-lg:18px;
  --r-pill:999px;

  /* --- 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", "Noto Sans SC", ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;

  /* --- 布局节奏 --- */
  --wrap:1200px;
  --gutter:32px;
  --header-h:68px;
  --sec-y:84px;
}

/* ==========================================================================
   基础
   ========================================================================== */
*,*::before,*::after{box-sizing:border-box;}
html{
  margin:0;
  padding:0;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 18px);
  -webkit-text-size-adjust:100%;
}
html.nav-open{overflow:hidden;}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  color:var(--text);
  background-color:var(--bg);
  background-image:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 38%,var(--bg-bottom) 100%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:clip;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:radial-gradient(circle at 1px 1px,var(--grain-dot) 1px,transparent 0);
  background-size:3px 3px;
}
img,svg{max-width:100%;}
img{height:auto;}
a{color:inherit;text-decoration:none;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font:inherit;color:inherit;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs);}
.no-break{white-space:nowrap;}
.svg-sprite{position:absolute;width:0;height:0;overflow:hidden;}

/* SVG 渐变 stop / 描线用的类（颜色全部走令牌，SVG 里只写 class） */
.stop-a{stop-color:var(--accent);}
.stop-b{stop-color:var(--amber);}
.stop-c{stop-color:var(--accent);}
.stop-d{stop-color:var(--amber);}
.stop-halo-a{stop-color:var(--amber);stop-opacity:.26;}
.stop-halo-b{stop-color:var(--amber);stop-opacity:0;}

/* ==========================================================================
   版心与区块节奏（横向留白只由版心负责，区块类只声明纵向）
   ========================================================================== */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.sec{padding-top:var(--sec-y);padding-bottom:var(--sec-y);}
.sec--tight{padding-top:52px;padding-bottom:52px;}
.sec-head{max-width:720px;margin-bottom:38px;}
.sec-head--center{margin-inline:auto;text-align:center;}
.sec-title{margin:14px 0 0;font-family:var(--font-display);font-size:clamp(26px,3.2vw,38px);font-weight:800;line-height:1.18;letter-spacing:-.03em;text-wrap:balance;}
.sec-lede{margin:14px 0 0;font-size:16.5px;line-height:27px;color:var(--muted);}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--accent-dark);
}
.kicker::before{content:"";width:18px;height:1px;background:var(--accent-40);flex:0 0 auto;}

/* ==========================================================================
   排版
   ========================================================================== */
h1,h2,h3,h4{margin:0;font-family:var(--font-display);color:var(--text);font-weight:800;text-wrap:balance;}
h1{font-size:clamp(34px,5vw,54px);line-height:1.1;letter-spacing:-.03em;}
h2{font-size:clamp(24px,2.6vw,32px);line-height:1.2;letter-spacing:-.028em;}
h3{font-size:clamp(17px,1.5vw,20px);font-weight:700;line-height:1.35;letter-spacing:-.018em;}
h4{font-size:15px;font-weight:700;line-height:1.4;letter-spacing:-.01em;}
p{margin:0;}
p+p{margin-top:14px;}
.lede{font-size:17px;line-height:28px;color:var(--muted);}
.small{font-size:13px;line-height:22px;color:var(--muted);}
.mono{font-family:var(--font-mono);letter-spacing:-.01em;}
.muted{color:var(--muted);}
.link{color:var(--accent);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
.link:hover{color:var(--accent-dark);}
strong,b{font-weight:600;}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:52px;
  padding:0 28px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  white-space:nowrap;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, border-color .18s ease, color .18s ease;
}
.btn svg{display:block;flex-shrink:0;}
.btn-primary{background:var(--accent);color:var(--panel);box-shadow:var(--shadow-cta);}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px);}
.btn-ghost{background:var(--panel);color:var(--text);border-color:var(--border);box-shadow:0 8px 18px -14px var(--ink-12);}
.btn-ghost:hover{border-color:var(--accent-40);transform:translateY(-2px);}
.btn-quiet{background:var(--accent-08);color:var(--accent-dark);border-color:var(--accent-16);}
.btn-quiet:hover{background:var(--accent-14);transform:translateY(-2px);}
.btn-sm{min-height:42px;padding:0 20px;font-size:13.5px;}
.btn-block{width:100%;}
.btn[disabled],.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;}

/* ==========================================================================
   站点头部（header.js 注入）
   ========================================================================== */
#site-header{position:relative;z-index:5;}
.topbar{
  position:relative;
  display:flex;
  align-items:center;
  gap:26px;
  height:var(--header-h);
  max-width:1440px;
  margin:0 auto;
  padding-inline:var(--gutter);
  border-bottom:1px solid var(--border-soft);
}
.topbar::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:var(--topbar-bg);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.brand{display:flex;align-items:center;gap:9px;flex:0 0 auto;}
.brand-mark{display:block;width:30px;height:30px;}
.brand-word{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--text);
  white-space:nowrap;
}
.brand-zh{
  font-size:12.5px;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--muted);
  padding-left:9px;
  border-left:1px solid var(--border-strong);
  line-height:1.2;
  white-space:nowrap;
}
.nav{display:flex;align-items:center;margin-left:26px;}
.nav-list{display:flex;align-items:center;gap:26px;margin:0;padding:0;list-style:none;}
.nav-list a{
  display:inline-flex;
  align-items:center;
  min-height:36px;
  font-size:14px;
  font-weight:500;
  color:var(--muted);
  letter-spacing:.005em;
  white-space:nowrap;
  transition:color .18s ease;
}
.nav-list a:hover{color:var(--text);}
.nav-list a[data-active="true"]{color:var(--text);font-weight:600;}
.top-tools{margin-left:auto;display:flex;align-items:center;gap:14px;flex:0 0 auto;}

.lang{position:relative;display:flex;align-items:center;}
.lang-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  width:auto;
  min-height:36px;
  padding:6px 10px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  background:transparent;
  color:var(--muted);
  font-size:13px;
  cursor:pointer;
  transition:color .18s ease, border-color .18s ease;
}
.lang-btn:hover{color:var(--text);border-color:var(--border);}
.lang-btn svg{display:block;flex-shrink:0;opacity:.7;}
.lang-text{white-space:nowrap;}
.lang-menu{
  position:absolute;
  top:calc(100% + 8px);
  right:0;
  z-index:30;
  display:none;
  min-width:158px;
  margin:0;
  padding:6px;
  list-style:none;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-card), var(--shadow-inner-hi);
}
.lang-menu.is-open{display:block;}
.lang-menu a{
  display:flex;
  align-items:center;
  min-height:38px;
  padding:6px 12px;
  border-radius:var(--r-sm);
  font-size:13px;
  color:var(--muted);
  white-space:nowrap;
}
.lang-menu a:hover{background:var(--bg);color:var(--text);}
.lang-menu a[aria-current="true"]{color:var(--accent-dark);font-weight:600;}

.btn-login{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:38px;
  padding:0 18px;
  border-radius:var(--r-pill);
  background:var(--accent);
  color:var(--panel);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.02em;
  white-space:nowrap;
  box-shadow:var(--shadow-cta);
  transition:transform .18s ease, background-color .18s ease;
}
.btn-login:hover{background:var(--accent-dark);transform:translateY(-1px);}

.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  min-width:44px;
  min-height:44px;
  padding:0;
  border:1px solid var(--border);
  border-radius:var(--r-sm);
  background:var(--panel);
  color:var(--text);
  cursor:pointer;
}
.nav-toggle svg{display:block;}

.drawer{
  position:fixed;
  top:var(--header-h);
  left:0;
  right:0;
  z-index:40;
  display:none;
  max-height:calc(100dvh - var(--header-h));
  overflow-y:auto;
  overscroll-behavior:contain;
  background:var(--panel);
  border-bottom:1px solid var(--border);
  box-shadow:var(--shadow-card);
  padding-bottom:16px;
}
.drawer.is-open{display:block;}
.drawer-title{
  margin:0;
  padding:14px var(--gutter) 6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--muted);
}
.drawer-list,.drawer-lang{margin:0;padding:0;list-style:none;}
.drawer-list a,.drawer-lang a{
  display:flex;
  align-items:center;
  width:100%;
  min-height:48px;
  padding:12px var(--gutter);
  font-size:15px;
  font-weight:500;
  color:var(--text);
  border-bottom:1px solid var(--border-soft);
}
.drawer-lang a{font-size:14px;color:var(--muted);}
.drawer-list a:hover,.drawer-lang a:hover{background:var(--bg);}
.drawer-list a[data-active="true"]{color:var(--accent-dark);font-weight:600;}

.nav-veil{
  position:fixed;
  top:var(--header-h);
  left:0;
  right:0;
  bottom:0;
  z-index:30;
  display:none;
  background:var(--scrim);
}
.nav-veil.is-open{display:block;}

/* ==========================================================================
   站点页脚（footer.js 注入）
   ========================================================================== */
.site-foot{
  margin-top:var(--sec-y);
  background:var(--panel);
  border-top:1px solid var(--border);
  padding-top:56px;
  padding-bottom:26px;
}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1.2fr .8fr;gap:34px;}
.foot-grid>*{min-width:0;}
.foot-logo{display:inline-flex;align-items:center;gap:8px;}
.foot-logo img{display:block;width:28px;height:28px;}
.foot-logo-word{font-family:var(--font-display);font-size:17px;font-weight:800;letter-spacing:-.02em;}
.foot-tag{margin-top:14px;max-width:340px;font-size:13.5px;line-height:23px;color:var(--muted);}
.foot-fact{margin-top:12px;font-family:var(--font-mono);font-size:11.5px;line-height:20px;color:var(--accent-dark);}
.foot-h{margin:0 0 12px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--muted);}
.foot-list li+li{margin-top:2px;}
.foot-list a{
  display:inline-flex;
  align-items:center;
  min-height:30px;
  font-size:13.5px;
  color:var(--muted);
  transition:color .18s ease;
}
.foot-list a:hover{color:var(--accent-dark);}
.foot-tags{display:flex;flex-wrap:wrap;gap:8px;}
.foot-tags a{
  display:inline-flex;
  align-items:center;
  min-height:28px;
  max-width:100%;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  padding:4px 11px;
  border:1px solid var(--border);
  border-radius:var(--r-pill);
  background:var(--bg);
  font-size:12.5px;
  color:var(--muted);
  transition:border-color .18s ease, color .18s ease;
}
.foot-tags a:hover{border-color:var(--accent-40);color:var(--accent-dark);}
.foot-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 22px;
  margin-top:44px;
  padding-top:20px;
  border-top:1px solid var(--border-soft);
}
.foot-copy{font-family:var(--font-mono);font-size:12px;color:var(--muted);}
.foot-legal{display:flex;flex-wrap:wrap;gap:6px 20px;}
.foot-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:12.5px;color:var(--muted);}
.foot-legal a:hover{color:var(--accent-dark);}

/* ==========================================================================
   通用面板 / 网格
   ========================================================================== */
.card{
  min-width:0;
  padding:26px;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  box-shadow:var(--shadow-card), var(--shadow-inner-hi);
}
.card--flat{box-shadow:var(--shadow-inner-hi);}
.card--lift{transition:transform .22s ease, box-shadow .22s ease;}
.card--lift:hover{transform:translateY(-4px);box-shadow:var(--shadow-lift), var(--shadow-inner-hi);}
.grid{display:grid;gap:20px;}
.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));}

/* ==========================================================================
   滚动淡入：默认可见，隐藏态只由 .pending 承担（由 reveal.js 运行时施加）
   ========================================================================== */
.reveal{transition:opacity .55s ease, transform .55s ease;}
.reveal.pending{opacity:0;transform:translateY(16px);}

/* ==========================================================================
   窄屏溢出防线（三个惯犯就地防死）
   ========================================================================== */
/* ① 超长不可断串：行内 code / 订阅 URL / 安装包文件名 */
code,kbd,samp{
  font-family:var(--font-mono);
  font-size:.92em;
  overflow-wrap:anywhere;
  word-break:break-word;
}
pre{
  max-width:100%;
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  padding:16px 18px;
  border:1px solid var(--border);
  border-radius:var(--r-md);
  background:var(--panel-2);
  font-size:13px;
  line-height:22px;
}
pre code{overflow-wrap:normal;word-break:normal;white-space:pre;}

/* ② 装饰性微倾斜：只许作用在短装饰块上，窄屏一律归零 */
.tilt-l{transform:rotate(-.45deg);}
.tilt-r{transform:rotate(.45deg);}

/* ③ 绝对定位装饰元素的宿主必须夹住横向溢出 */
.edge-clip{position:relative;max-width:100%;overflow-x:clip;}

/* 线路状态容器：文档流占位 + 夹住网格，禁止绝对定位与负 margin */
#server-status{
  display:block;
  position:static;
  max-width:100%;
  overflow:hidden;
  margin:0 0 32px;
}
#server-status>*{min-width:0;}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1024px){
  :root{--gutter:24px;--sec-y:68px;}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px;}
}
@media (max-width:1000px){
  .nav{display:none;}
  .nav-toggle{display:inline-flex;}
}
@media (max-width:900px){
  :root{--sec-y:60px;}
  .topbar{padding-inline:18px;gap:14px;}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:640px){
  :root{--gutter:16px;--sec-y:52px;--header-h:60px;}
  .no-break{white-space:normal;}
  .tilt-l,.tilt-r{transform:none;}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr);}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:26px;}
  .foot-bottom{justify-content:flex-start;}
  .brand-word{font-size:17px;}
  .btn{width:100%;}
  .btn-sm{width:auto;}
  .card{padding:20px;}
}
@media (max-width:380px){
  .lang-text{display:none;}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none;}
  *{transition-duration:.001ms !important;}
}

/* lh:local-harden:start */
:is(h1,h2,h3,h4){text-wrap:balance}
:is(p,li,dd,dt,figcaption,blockquote,td,th){text-wrap:pretty}
html[lang|="ko"] body{word-break:keep-all;overflow-wrap:break-word}
html[lang|="ja"] :is(h1,h2,h3,h4){word-break:auto-phrase}
.lh-tscroll{overflow-x:auto;max-width:100%;-webkit-overflow-scrolling:touch}
@media (max-width:640px){.lh-tscroll :is(th,td){min-width:5.5em}}
@supports (animation-timeline:scroll()){
  .float-cta{animation:lh-fab-in linear both;animation-timeline:scroll(root);animation-range:0 70vh}
}
@keyframes lh-fab-in{0%,45%{opacity:0;visibility:hidden}100%{opacity:1;visibility:visible}}
/* lh:local-harden:end */