/* ═══════════════════════════════════════════════════════════════════
   rsliyu.com — 设计系统
   暖白 / 暖黑双主题 · Manrope + Geist · 砖红-珊瑚强调色
   改这里的变量就能换整站气质，组件层不写死颜色
   ═══════════════════════════════════════════════════════════════════ */

:root{
  /* ── 亮色（默认）───────────────────────────────────── */
  --bg:          #f3f4f1;
  --bg-raise:    #fbfbf8;
  --bg-sink:     #eaebe6;
  --ink:         #171815;
  --ink-soft:    rgba(23,24,21,.66);
  --ink-mute:    rgba(23,24,21,.42);
  --ink-faint:   rgba(23,24,21,.22);
  --line:        rgba(23,24,21,.13);
  --line-strong: rgba(23,24,21,.24);
  --accent:      #b93b28;
  --accent-soft: #f3d8d0;
  --accent-ink:  #fbfbf7;
  --dot:         rgba(23,24,21,.13);
  --spotlight:   rgba(185,59,40,.10);
  --head-bg:     rgba(243,244,241,.82);

  /* ── 字体 ──────────────────────────────────────────── */
  --cjk: "PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Noto Sans SC","Microsoft YaHei";
  --display: "Manrope", var(--cjk), system-ui, sans-serif;
  --sans:    "Geist", var(--cjk), system-ui, sans-serif;
  --mono:    "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* ── 尺度 ──────────────────────────────────────────── */
  --shell:   min(1160px, calc(100% - clamp(32px,6vw,104px)));
  --radius:  14px;
  --ease:    cubic-bezier(.32,0,.16,1);
  --ease-out:cubic-bezier(.2,.7,.2,1);
  --dur:     .62s;
}

:root[data-theme="dark"]{
  --bg:          #171815;
  --bg-raise:    #1e201c;
  --bg-sink:     #121310;
  --ink:         #f3f4f1;
  --ink-soft:    rgba(243,244,241,.64);
  --ink-mute:    rgba(243,244,241,.42);
  --ink-faint:   rgba(243,244,241,.20);
  --line:        rgba(243,244,241,.13);
  --line-strong: rgba(243,244,241,.26);
  --accent:      #f06449;
  --accent-soft: #4b2922;
  --accent-ink:  #171815;
  --dot:         rgba(243,244,241,.12);
  --spotlight:   rgba(240,100,73,.11);
  --head-bg:     rgba(23,24,21,.80);
  color-scheme: dark;
}

@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#171815; --bg-raise:#1e201c; --bg-sink:#121310;
    --ink:#f3f4f1; --ink-soft:rgba(243,244,241,.64); --ink-mute:rgba(243,244,241,.42);
    --ink-faint:rgba(243,244,241,.20); --line:rgba(243,244,241,.13);
    --line-strong:rgba(243,244,241,.26);
    --accent:#f06449; --accent-soft:#4b2922; --accent-ink:#171815;
    --dot:rgba(243,244,241,.12); --spotlight:rgba(240,100,73,.11);
    --head-bg:rgba(23,24,21,.80);
    color-scheme: dark;
  }
}

/* ═══ 基础 ═══════════════════════════════════════════════════════ */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
@media (prefers-reduced-motion:reduce){ html{ scroll-behavior:auto } }

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.65;
  font-feature-settings:"cv11","ss01";
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  transition:background-color .5s var(--ease), color .5s var(--ease);
}

/* 点阵 + 跟随指针的光斑：整站"活起来"的来源 */
body::before{
  content:""; position:fixed; inset:0; z-index:0; pointer-events:none;
  background-image:radial-gradient(var(--dot) 1px, transparent 1px);
  background-size:26px 26px;
  -webkit-mask-image:radial-gradient(closest-side at 50% 34%, #000 12%, transparent 92%);
  mask-image:radial-gradient(closest-side at 50% 34%, #000 12%, transparent 92%);
  animation:drift 34s linear infinite;
}
body::after{
  content:""; position:fixed; inset:0; z-index:0; pointer-events:none;
  background:radial-gradient(460px circle at var(--mx,50%) var(--my,22%), var(--spotlight), transparent 68%);
  transition:opacity .6s var(--ease);
}
@keyframes drift{ to{ background-position:26px 26px } }

::selection{ background:var(--accent); color:var(--accent-ink); }

a{ color:inherit; }
:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; border-radius:3px; }

/* ═══ 排版 ═══════════════════════════════════════════════════════ */
h1,h2,h3,h4{ font-family:var(--display); font-weight:600; letter-spacing:-.025em; line-height:1.08; margin:0; }
p{ margin:0; }

.display{ font-size:clamp(38px,7.2vw,82px); font-weight:700; letter-spacing:-.035em; line-height:1.02; }
.h2{ font-size:clamp(26px,3.6vw,42px); }
.h3{ font-size:clamp(19px,2.1vw,24px); letter-spacing:-.018em; }

.lede{ font-size:clamp(16px,1.6vw,19px); line-height:1.75; color:var(--ink-soft); max-width:52ch; }
.body{ color:var(--ink-soft); max-width:60ch; }
.small{ font-size:14px; color:var(--ink-soft); }

/* 眉标：所有分区的小标签统一用这个 */
.eyebrow{
  display:flex; align-items:center; gap:10px;
  font-family:var(--mono); font-size:11px; font-weight:500;
  letter-spacing:.16em; text-transform:uppercase; color:var(--ink-mute);
  margin:0 0 20px;
}
.eyebrow::before{ content:""; width:22px; height:1px; background:var(--line-strong); flex:none; }

.mono{ font-family:var(--mono); font-variant-numeric:tabular-nums; }
.accent{ color:var(--accent); }

/* ═══ 布局 ═══════════════════════════════════════════════════════ */
.shell{ width:var(--shell); margin-inline:auto; position:relative; z-index:1; }
main{ position:relative; z-index:1; }
section{ padding-block:clamp(62px,9vw,120px); }
.section-head{ margin-bottom:clamp(34px,4.6vw,58px); }
.hr{ height:1px; background:var(--line); border:0; margin:0; }

/* ═══ 页头 ═══════════════════════════════════════════════════════ */
.site-head{
  position:sticky; top:0; z-index:50;
  background:var(--head-bg);
  backdrop-filter:blur(16px) saturate(150%);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  border-bottom:1px solid var(--line);
}
@media (prefers-reduced-transparency:reduce){
  .site-head{ background:var(--bg); backdrop-filter:none; -webkit-backdrop-filter:none; }
}
.head-in{ display:flex; align-items:center; gap:24px; height:66px; }

.brand{
  font-family:var(--display); font-weight:700; font-size:17px;
  letter-spacing:-.02em; text-decoration:none; margin-right:auto;
  display:flex; align-items:center; gap:9px;
}
.brand .bdot{
  width:7px; height:7px; border-radius:50%; background:var(--accent); flex:none;
  box-shadow:0 0 0 0 var(--accent);
  animation:ping 3.2s var(--ease-out) infinite;
}
@keyframes ping{
  0%{ box-shadow:0 0 0 0 color-mix(in srgb,var(--accent) 45%,transparent) }
  70%{ box-shadow:0 0 0 8px transparent } 100%{ box-shadow:0 0 0 0 transparent }
}

.nav{ display:flex; gap:4px; list-style:none; margin:0; padding:0; }
.nav a{
  position:relative; display:block; padding:7px 13px; border-radius:9px;
  text-decoration:none; font-size:14px; color:var(--ink-soft);
  transition:color .3s var(--ease), background-color .3s var(--ease);
}
.nav a::after{ content:attr(data-en); font-family:var(--mono); font-size:9.5px;
  letter-spacing:.12em; text-transform:uppercase; color:var(--ink-faint);
  display:block; margin-top:-2px; }
.nav a:hover{ color:var(--ink); background:var(--bg-sink); }
.nav a[aria-current="page"]{ color:var(--accent); }
.nav a[aria-current="page"]::after{ color:var(--accent); opacity:.6; }

.tgl{
  width:34px; height:34px; flex:none; display:grid; place-items:center;
  border:1px solid var(--line); border-radius:9px; background:transparent;
  color:var(--ink-soft); cursor:pointer;
  transition:border-color .3s var(--ease), color .3s var(--ease), transform .3s var(--ease);
}
.tgl:hover{ color:var(--ink); border-color:var(--line-strong); transform:rotate(18deg); }
.tgl svg{ width:16px; height:16px; }
/* 图标表示"点了会变成什么"：亮色下显示月亮，暗色下显示太阳 */
.tgl .i-sun{ display:none }
.tgl .i-moon{ display:block }
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .tgl .i-sun{ display:block }
  :root:not([data-theme="light"]) .tgl .i-moon{ display:none }
}
:root[data-theme="dark"] .tgl .i-sun{ display:block }
:root[data-theme="dark"] .tgl .i-moon{ display:none }
:root[data-theme="light"] .tgl .i-sun{ display:none }
:root[data-theme="light"] .tgl .i-moon{ display:block }

@media (max-width:760px){
  .head-in{ height:58px; gap:12px }
  .nav{ gap:0 }
  .nav a{ padding:6px 9px; font-size:13px }
  .nav a::after{ display:none }
}

/* ═══ Hero ═══════════════════════════════════════════════════════ */
.hero{ padding-block:clamp(76px,13vw,152px) clamp(52px,7vw,88px); }
.hero .display{ margin-bottom:26px; }
.hero .lede{ margin-bottom:38px; }

.cta-row{ display:flex; flex-wrap:wrap; gap:12px; }
.btn{
  display:inline-flex; align-items:center; gap:9px;
  padding:11px 20px; border-radius:11px; text-decoration:none;
  font-size:14px; font-weight:500; border:1px solid transparent;
  transition:transform .3s var(--ease), background-color .3s var(--ease),
             border-color .3s var(--ease), color .3s var(--ease);
}
.btn-primary{ background:var(--accent); color:var(--accent-ink); }
.btn-primary:hover{ transform:translateY(-2px); }
.btn-ghost{ border-color:var(--line-strong); color:var(--ink-soft); }
.btn-ghost:hover{ color:var(--ink); border-color:var(--ink); transform:translateY(-2px); }
.btn .arw{ transition:transform .35s var(--ease); }
.btn:hover .arw{ transform:translateX(3px); }

/* ═══ 统计条 ═════════════════════════════════════════════════════ */
.stats{
  display:grid; gap:1px; background:var(--line);
  border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
}
.stat{ background:var(--bg); padding:22px 24px; }
.stat dt{ font-family:var(--mono); font-size:10.5px; letter-spacing:.14em;
  text-transform:uppercase; color:var(--ink-mute); margin-bottom:9px; }
.stat dd{ margin:0; font-family:var(--display); font-size:clamp(27px,3.4vw,36px);
  font-weight:700; letter-spacing:-.03em; font-variant-numeric:tabular-nums; line-height:1; }
.stat dd .u{ font-size:.42em; font-weight:500; color:var(--ink-mute); margin-left:5px;
  letter-spacing:0; }

/* ═══ 卡片网格 ═══════════════════════════════════════════════════ */
.grid{ display:grid; gap:clamp(14px,1.6vw,20px);
  grid-template-columns:repeat(auto-fill,minmax(288px,1fr)); }

.card{
  position:relative; display:flex; flex-direction:column;
  padding:26px 26px 24px; border:1px solid var(--line);
  border-radius:var(--radius); background:var(--bg-raise);
  text-decoration:none; overflow:hidden;
  transition:border-color .4s var(--ease), transform .4s var(--ease),
             box-shadow .4s var(--ease);
}
.card::before{
  content:""; position:absolute; inset:0; pointer-events:none;
  background:linear-gradient(150deg, color-mix(in srgb,var(--accent) 8%,transparent), transparent 46%);
  opacity:0; transition:opacity .45s var(--ease);
}
a.card:hover{ transform:translateY(-3px); border-color:var(--line-strong);
  box-shadow:0 14px 34px -22px rgba(0,0,0,.42); }
a.card:hover::before{ opacity:1; }

.card-top{ display:flex; align-items:center; justify-content:space-between; gap:12px;
  margin-bottom:15px; }
.tag{
  font-family:var(--mono); font-size:10px; letter-spacing:.12em; text-transform:uppercase;
  padding:3.5px 9px; border-radius:999px;
  background:var(--accent-soft); color:var(--accent);
}
:root[data-theme="dark"] .tag{ color:var(--accent) }
.card h3{ font-size:19px; margin-bottom:9px; position:relative; }
.card p{ font-size:14px; line-height:1.72; color:var(--ink-soft); position:relative; flex:1; }
.card-foot{
  display:flex; align-items:center; gap:7px; margin-top:18px;
  font-family:var(--mono); font-size:11px; letter-spacing:.08em;
  color:var(--ink-mute); position:relative;
}
.card-foot .arw{ transition:transform .35s var(--ease) }
a.card:hover .card-foot{ color:var(--accent) }
a.card:hover .card-foot .arw{ transform:translateX(4px) }

.dot{ width:6px; height:6px; border-radius:50%; background:#4eb879; flex:none; }
.dot.off{ background:var(--ink-faint) }

/* ═══ 规格清单（服务器页）═════════════════════════════════════════ */
.spec{ border-top:1px solid var(--line); }
.spec-row{
  display:grid; grid-template-columns:minmax(140px,.32fr) 1fr;
  gap:16px 28px; padding:19px 0; border-bottom:1px solid var(--line);
  align-items:baseline;
}
.spec-row dt{ font-family:var(--mono); font-size:11px; letter-spacing:.13em;
  text-transform:uppercase; color:var(--ink-mute); }
.spec-row dd{ margin:0; font-size:15px; color:var(--ink); }
.spec-row dd .sub{ display:block; font-size:13.5px; color:var(--ink-soft); margin-top:5px; }
@media (max-width:620px){ .spec-row{ grid-template-columns:1fr; gap:6px } }

/* ═══ 服务清单 ═══════════════════════════════════════════════════ */
.svc-list{ display:grid; gap:1px; background:var(--line);
  border:1px solid var(--line); border-radius:var(--radius); overflow:hidden; }
.svc{
  display:grid; grid-template-columns:auto 1fr auto; gap:14px; align-items:center;
  padding:14px 20px; background:var(--bg); text-decoration:none;
  transition:background-color .3s var(--ease);
}
.svc:hover{ background:var(--bg-sink) }
.svc-name{ font-size:14.5px; font-weight:500 }
.svc-desc{ font-size:13px; color:var(--ink-mute); margin-top:2px }
.svc-host{ font-family:var(--mono); font-size:11.5px; color:var(--ink-mute);
  white-space:nowrap; }
@media (max-width:640px){ .svc-host{ display:none } }

/* ═══ 页脚 ═══════════════════════════════════════════════════════ */
.site-foot{
  border-top:1px solid var(--line); margin-top:clamp(60px,8vw,110px);
  padding-block:44px 52px; position:relative; z-index:1;
}
.foot-in{ display:flex; flex-wrap:wrap; gap:22px 44px; align-items:flex-start;
  justify-content:space-between; }
.foot-links{ display:flex; flex-wrap:wrap; gap:8px 26px; list-style:none; margin:0; padding:0 }
.foot-links a{
  position:relative; font-size:13.5px; color:var(--ink-soft); text-decoration:none;
  transition:color .3s var(--ease);
}
.foot-links a::after{
  content:""; position:absolute; left:0; right:0; bottom:-3px; height:1px;
  background:currentColor; transform:scaleX(0); transform-origin:left;
  transition:transform .42s var(--ease-out);
}
.foot-links a:hover{ color:var(--ink) }
.foot-links a:hover::after{ transform:scaleX(1) }
.foot-meta{ font-family:var(--mono); font-size:11px; letter-spacing:.07em;
  color:var(--ink-faint); }

/* ═══ 入场动画 ═══════════════════════════════════════════════════ */
.rv{ opacity:0; transform:translateY(18px); }
.rv-in{ animation:rise var(--dur) var(--ease-out) forwards }
@keyframes rise{ to{ opacity:1; transform:none } }

/* ═══ 跨文档转场（Chrome/Safari 原生支持）══════════════════════════ */
@view-transition{ navigation:auto }
@media (prefers-reduced-motion:no-preference){
  ::view-transition-old(root){ animation:vt-out .3s var(--ease) both }
  ::view-transition-new(root){ animation:vt-in .42s var(--ease) both }
}
@keyframes vt-out{ to{ opacity:0; transform:translateY(-6px) } }
@keyframes vt-in{ from{ opacity:0; transform:translateY(10px) } }

/* ═══ 降级 ═══════════════════════════════════════════════════════ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important; animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .rv{ opacity:1; transform:none }
  body::before{ animation:none }
}
@media (max-width:520px){
  .stats{ grid-template-columns:repeat(2,1fr) }
}