/* =========================================================
   The Backrooms FH — 后室 FH 分站
   站点样式（纯 CSS，无外部依赖）
   ========================================================= */

:root{
  --wall-1:#cdba7b;
  --wall-2:#b7a263;
  --ink:#221d10;
  --ink-soft:#4b4023;
  --paper:#ece5cd;
  --paper-2:#dfd5b2;
  --line:rgba(66,52,16,.35);
  --line-strong:rgba(56,44,12,.6);
  --accent:#8c7628;
  --lamp:#fffbdc;
  --dark:#15140e;
  --serif:"Georgia","Times New Roman","Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --sans:"Noto Sans SC","Microsoft YaHei","Segoe UI","Helvetica Neue",Arial,sans-serif;
  --mono:"Consolas","SFMono-Regular","Noto Sans Mono","Courier New",monospace;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  min-height:100vh;
  overflow-x:hidden;
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.8;
  background-color:var(--wall-1);
  background-image:
    repeating-linear-gradient(90deg, rgba(255,247,205,.18) 0 1px, transparent 1px 52px),
    repeating-linear-gradient(0deg, rgba(52,42,8,.10) 0 1px, transparent 1px 52px),
    radial-gradient(1200px 520px at 50% -10%, rgba(255,251,222,.8), rgba(255,251,222,0) 70%),
    radial-gradient(900px 620px at 8% 112%, rgba(52,42,8,.3), rgba(52,42,8,0) 65%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4'/><feColorMatrix type='saturate' values='0'/></filter><rect width='180' height='180' filter='url(%23n)' opacity='0.16'/></svg>");
  background-attachment:fixed;
}

/* 荧光灯：页面最顶端一束随时会闪一下的光 */
.lamp{
  position:fixed;
  top:0; left:0; right:0;
  height:2px;
  z-index:99;
  pointer-events:none;
  background:linear-gradient(90deg, transparent, rgba(255,251,220,.85) 18%, #fff 50%, rgba(255,251,220,.85) 82%, transparent);
  box-shadow:0 0 20px 5px rgba(255,250,214,.6);
  animation:flicker 8s infinite;
}
@keyframes flicker{
  0%, 96.6%, 100%{opacity:.92}
  96.9%{opacity:.35}
  97.2%{opacity:.98}
  97.6%{opacity:.5}
  97.9%{opacity:1}
  98.2%{opacity:.7}
}

/* 扫描线 */
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:98;
  pointer-events:none;
  opacity:.06;
  background:repeating-linear-gradient(0deg, #000 0 1px, transparent 1px 3px);
}

a{color:#6b5716}
a:hover{color:#40330a}

/* ---------------- 顶栏 ---------------- */
.topbar{
  position:sticky;
  top:0;
  z-index:60;
  display:flex;
  align-items:center;
  gap:22px;
  flex-wrap:wrap;
  padding:11px clamp(14px,4vw,44px);
  background:linear-gradient(180deg, rgba(19,18,12,.97), rgba(19,18,12,.86));
  border-bottom:1px solid rgba(255,246,200,.3);
  box-shadow:0 12px 34px rgba(0,0,0,.4);
  backdrop-filter:blur(3px);
}

.brand{
  display:flex;
  align-items:center;
  gap:11px;
  text-decoration:none;
  color:#efe6c4;
}
.brand:hover{color:#fff}

.brand .mark{
  display:grid;
  place-items:center;
  width:38px; height:38px;
  border:2px solid #efe6c4;
  font-family:var(--serif);
  font-weight:700;
  font-size:15px;
  letter-spacing:.04em;
  line-height:1;
  background:linear-gradient(160deg, rgba(255,251,220,.14), rgba(255,251,220,0));
  box-shadow:0 0 0 1px rgba(0,0,0,.6), 0 0 18px rgba(255,247,200,.22);
}

.brand .wordmark{
  font-family:var(--serif);
  font-size:15px;
  letter-spacing:.24em;
  text-transform:uppercase;
  line-height:1.2;
}
.brand .wordmark b{color:#f6e89c; font-weight:700}

.topnav{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,26px);
  flex-wrap:wrap;
  margin-left:auto;
  font-size:14px;
  letter-spacing:.06em;
}
.topnav a{
  color:#c9bd94;
  text-decoration:none;
  padding:4px 2px;
  border-bottom:1px solid transparent;
}
.topnav a:hover,
.topnav a[aria-current="page"]{
  color:#fffaDC;
  border-bottom-color:#f0e3a2;
}

/* ---------------- 布局 ---------------- */
.wrap{
  width:min(1100px, calc(100% - 32px));
  margin:0 auto;
  padding:34px 0 70px;
}

/* 纸面卡片 */
.paper{
  position:relative;
  background:
    linear-gradient(180deg, rgba(255,255,255,.55), rgba(255,255,255,0) 55%),
    repeating-linear-gradient(0deg, rgba(120,100,40,.045) 0 1px, transparent 1px 27px),
    var(--paper);
  border:1px solid var(--line);
  box-shadow:
    0 1px 0 rgba(255,255,255,.65) inset,
    0 16px 38px rgba(38,29,4,.26);
}

/* ---------------- 主页头图 ---------------- */
.hero{
  padding:clamp(30px,6vw,70px) clamp(20px,5vw,64px);
  text-align:center;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(600px 240px at 50% 0%, rgba(255,250,214,.9), rgba(255,250,214,0) 70%);
}
.hero-inner{position:relative}

.hero .eyebrow{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.42em;
  text-transform:uppercase;
  color:#8a7524;
  margin:0 0 16px;
}

.hero h1{
  font-family:var(--serif);
  font-size:clamp(30px,6.4vw,60px);
  line-height:1.08;
  letter-spacing:.06em;
  margin:0;
  text-transform:uppercase;
  color:#221d10;
  text-shadow:0 1px 0 rgba(255,255,255,.6);
}
.hero h1 span{
  display:block;
  font-size:.42em;
  letter-spacing:.36em;
  margin-top:14px;
  color:#6f5d1c;
  text-transform:none;
}

.hero .lead{
  max-width:620px;
  margin:26px auto 0;
  font-size:15.5px;
  color:#3e3519;
}

.hero .actions{
  display:flex;
  gap:12px;
  justify-content:center;
  flex-wrap:wrap;
  margin-top:30px;
}

.btn{
  display:inline-block;
  padding:10px 22px;
  border:1px solid rgba(60,48,12,.5);
  text-decoration:none;
  font-size:14px;
  letter-spacing:.1em;
  color:#2b2411;
  background:linear-gradient(180deg, rgba(255,255,255,.6), rgba(255,255,255,0));
  box-shadow:0 1px 0 rgba(255,255,255,.7) inset, 0 6px 14px rgba(50,40,10,.14);
  transition:transform .12s ease, box-shadow .12s ease;
}
.btn:hover{transform:translateY(-1px); color:#1a1509; box-shadow:0 1px 0 rgba(255,255,255,.7) inset, 0 10px 20px rgba(50,40,10,.2)}
.btn--dark{
  background:linear-gradient(180deg, #262115, #17150e);
  color:#f4eab8;
  border-color:#0e0d08;
  box-shadow:0 6px 16px rgba(0,0,0,.35);
}
.btn--dark:hover{color:#fff; background:linear-gradient(180deg, #332c19, #1d1a11)}

/* ---------------- 区块 ---------------- */
.section{margin-top:34px}
.section-head{
  display:flex;
  align-items:baseline;
  gap:14px;
  margin:0 0 16px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.section-head h2{
  font-family:var(--serif);
  font-size:20px;
  letter-spacing:.14em;
  text-transform:uppercase;
  margin:0;
}
.section-head .sub{
  font-size:13px;
  color:#6d5c22;
  letter-spacing:.06em;
}
.section-head .more{margin-left:auto; font-size:13px}

/* ---------------- 条目卡 ---------------- */
.cards{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(268px,1fr));
  gap:16px;
}

.card{
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:18px 20px 16px;
  text-decoration:none;
  color:var(--ink);
  background:
    linear-gradient(180deg, rgba(255,255,255,.6), rgba(255,255,255,0) 60%),
    var(--paper);
  border:1px solid var(--line);
  box-shadow:0 10px 24px rgba(38,29,4,.2);
  transition:transform .13s ease, box-shadow .13s ease, border-color .13s ease;
}
.card:hover{
  transform:translateY(-2px);
  border-color:var(--line-strong);
  box-shadow:0 16px 34px rgba(38,29,4,.3);
  color:var(--ink);
}

.card .code{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.2em;
  color:#7d6a22;
  text-transform:uppercase;
}
.card h3{
  margin:0;
  font-family:var(--serif);
  font-size:18px;
  letter-spacing:.02em;
  line-height:1.35;
}
.card .sum{
  margin:0;
  font-size:13.5px;
  color:var(--ink-soft);
  line-height:1.65;
  display:-webkit-box;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.card .meta{
  margin-top:auto;
  padding-top:8px;
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  font-size:11.5px;
  color:#7b6a30;
  font-family:var(--mono);
  letter-spacing:.04em;
}

.tag{
  display:inline-block;
  padding:1px 8px;
  font-size:11.5px;
  letter-spacing:.06em;
  border:1px solid rgba(70,58,20,.4);
  color:#5d4c16;
  background:rgba(255,255,255,.35);
  font-family:var(--sans);
}

.empty{
  padding:40px 20px;
  text-align:center;
  color:#6b5c26;
  font-size:14px;
  border:1px dashed rgba(70,58,20,.45);
  background:rgba(255,255,255,.22);
}

/* ---------------- 条目正文 ---------------- */
.article{
  padding:clamp(24px,4.4vw,52px) clamp(20px,5vw,66px);
}

.crumbs{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  color:#7a6820;
  margin:0 0 18px;
}
.crumbs a{text-decoration:none; color:#6b5716}
.crumbs a:hover{text-decoration:underline}

.article h1{
  font-family:var(--serif);
  font-size:clamp(26px,4.6vw,42px);
  letter-spacing:.03em;
  line-height:1.16;
  margin:0 0 6px;
}
.article .subtitle{
  margin:0 0 22px;
  font-size:14px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:#7d6a22;
  font-family:var(--mono);
}

.article h2{
  font-family:var(--serif);
  font-size:22px;
  letter-spacing:.06em;
  margin:38px 0 12px;
  padding-bottom:6px;
  border-bottom:1px solid var(--line);
}
.article h3{
  font-family:var(--serif);
  font-size:17.5px;
  letter-spacing:.04em;
  margin:26px 0 8px;
}
.article p{margin:0 0 15px}
.article ul,.article ol{margin:0 0 15px; padding-left:24px}
.article li{margin:3px 0}
.article hr{
  border:0;
  border-top:1px solid var(--line);
  margin:30px 0;
}
.article blockquote{
  margin:20px 0;
  padding:12px 20px;
  border-left:3px solid #a8912f;
  background:rgba(255,251,220,.45);
  color:#40361a;
  font-style:italic;
}
.article code{
  font-family:var(--mono);
  font-size:.9em;
  padding:1px 5px;
  background:rgba(60,48,12,.08);
  border:1px solid rgba(60,48,12,.14);
}
.article table{
  width:100%;
  border-collapse:collapse;
  margin:18px 0;
  font-size:14px;
}
.article th,.article td{
  border:1px solid rgba(66,52,16,.35);
  padding:7px 11px;
  text-align:left;
}
.article th{background:rgba(60,48,12,.1)}

.byline{
  margin:34px 0 0;
  padding-top:16px;
  border-top:1px solid var(--line);
  font-size:12.5px;
  color:#7b6a30;
  font-family:var(--mono);
  letter-spacing:.04em;
  display:flex;
  gap:16px;
  flex-wrap:wrap;
}

/* ---------------- 生存难度 ---------------- */
.survival{
  display:grid;
  grid-template-columns:132px 1fr;
  margin:0 0 26px;
  border:2px solid rgba(56,44,12,.55);
  background:var(--paper-2);
  box-shadow:0 8px 20px rgba(40,30,5,.16);
}
.survival .sv-badge{
  display:grid;
  place-items:center;
  padding:14px 10px;
  text-align:center;
  color:#fff;
  font-family:var(--serif);
  font-weight:700;
  letter-spacing:.12em;
  text-shadow:0 1px 3px rgba(0,0,0,.45);
}
.survival .sv-badge small{
  display:block;
  font-family:var(--mono);
  font-size:9.5px;
  letter-spacing:.2em;
  font-weight:400;
  margin-top:3px;
  opacity:.85;
}
.survival ul{
  margin:0;
  padding:12px 18px;
  list-style:none;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:3px;
  font-size:14px;
}
.survival li::before{content:"▸ "; color:#7d6a22}

.sv-0 .sv-badge{background:#4f9c63}
.sv-1 .sv-badge{background:#84a83b}
.sv-2 .sv-badge{background:#c9a227}
.sv-3 .sv-badge{background:#cd7f27}
.sv-4 .sv-badge{background:#bf4028}
.sv-5 .sv-badge{background:#8f1c14}
.sv-habit .sv-badge{background:#4a6b8a}
.sv-dead .sv-badge{background:#2b2b2b}

/* ---------------- 页脚 ---------------- */
.footer{
  margin-top:44px;
  padding:26px clamp(16px,4vw,44px) 40px;
  border-top:1px solid rgba(255,246,200,.28);
  background:linear-gradient(180deg, rgba(19,18,12,.92), rgba(19,18,12,.98));
  color:#a2956c;
  font-size:12.5px;
  line-height:1.9;
}
.footer .wrap{padding:0}
.footer a{color:#d3c48d}
.footer .cols{
  display:flex;
  gap:32px;
  flex-wrap:wrap;
  justify-content:space-between;
}
.footer .note{max-width:520px}
.footer .fine{
  margin-top:18px;
  padding-top:14px;
  border-top:1px solid rgba(255,246,200,.14);
  font-family:var(--mono);
  letter-spacing:.05em;
  font-size:11.5px;
  color:#8a7f5c;
}

/* ---------------- 指导/关于 页 ---------------- */
.doc{padding:clamp(24px,4.4vw,52px) clamp(20px,5vw,66px)}
.doc h1{
  font-family:var(--serif);
  font-size:clamp(24px,4vw,34px);
  margin:0 0 8px;
  letter-spacing:.06em;
}
.doc h2{
  font-family:var(--serif);
  font-size:20px;
  margin:32px 0 10px;
  padding-bottom:6px;
  border-bottom:1px solid var(--line);
}
.doc p{margin:0 0 14px}
.doc ul,.doc ol{padding-left:24px; margin:0 0 14px}
.doc li{margin:4px 0}

.note-box{
  margin:20px 0;
  padding:14px 18px;
  border:1px solid rgba(70,58,20,.4);
  border-left:4px solid #a8912f;
  background:rgba(255,251,220,.5);
  font-size:14px;
}

/* 列表页的过滤条 */
.filterbar{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  align-items:center;
  margin:0 0 18px;
}
.filterbar input[type="search"]{
  flex:1 1 220px;
  min-width:180px;
  padding:8px 12px;
  font:inherit;
  font-size:14px;
  color:var(--ink);
  background:rgba(255,255,255,.55);
  border:1px solid var(--line);
  outline:none;
}
.filterbar input[type="search"]:focus{
  border-color:var(--line-strong);
  background:#fff;
}
.filterbar .count{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.08em;
  color:#6f5d1c;
}

/* ---------------- 响应式 ---------------- */
@media (max-width:640px){
  .topbar{gap:12px; padding:9px 14px}
  .brand .wordmark{font-size:12.5px; letter-spacing:.16em}
  .brand .mark{width:32px;height:32px;font-size:13px}
  .topnav{font-size:13px; gap:12px; width:100%; margin-left:0; padding-top:4px}
  .survival{grid-template-columns:1fr}
  .survival .sv-badge{padding:8px}
  .cards{grid-template-columns:1fr}
  .article,.doc{padding:22px 18px 34px}

  /* 窄屏：标题必须收进 358px 里，不然整页横向溢出 */
  .hero{padding:30px 16px 34px}
  .hero h1{font-size:22px; letter-spacing:.015em; line-height:1.14}
  .hero h1 span{font-size:10.5px; letter-spacing:.2em; margin-top:10px}
  .hero .eyebrow{font-size:10px; letter-spacing:.24em}
  .hero .lead{font-size:14px; margin-top:20px; text-align:left}
  .hero .actions{gap:8px; margin-top:22px}
  .btn{padding:9px 15px; font-size:13px}
  .section-head h2{font-size:17px}
  .cards{gap:12px}
}

@media (prefers-reduced-motion:reduce){
  .lamp{animation:none}
  html{scroll-behavior:auto}
}