:root{
  --bg:#f5f6f8; --bg-soft:#eef0f4; --card:#ffffff;
  --ink:#14161b; --ink-2:#3d434f; --sub:#79808f; --line:#e8eaef;
  --brand:#2f6bff; --brand-weak:#eaf1ff; --brand-ink:#fff;
  --danger:#e5484d; --ok:#10a37f; --warn:#f5a524;
  --r-lg:18px; --r-md:14px; --r-sm:10px;
  --shadow-1:0 1px 2px rgba(17,24,39,.04), 0 2px 8px rgba(17,24,39,.04);
  --shadow-2:0 4px 12px rgba(17,24,39,.07), 0 12px 32px rgba(17,24,39,.06);
  --pad:16px; --maxw:640px;
  --safe-b:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0d0f13; --bg-soft:#15181e; --card:#171a21;
    --ink:#eef0f4; --ink-2:#c3c9d4; --sub:#858d9c; --line:#252a34;
    --brand:#5b8cff; --brand-weak:#1b2740;
    --shadow-1:0 1px 2px rgba(0,0,0,.5); --shadow-2:0 8px 28px rgba(0,0,0,.45);
  }
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  padding-bottom:calc(40px + var(--safe-b));
}
a{color:var(--brand);text-decoration:none}
img{max-width:100%;display:block}
svg{overflow:hidden}
.i{width:18px;height:18px;flex:none;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.i.sm{width:16px;height:16px}
.i.lg{width:22px;height:22px}

/* ---------- 顶栏 ---------- */
header.top{
  position:sticky;top:0;z-index:30;
  background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:saturate(180%) blur(16px);
  border-bottom:1px solid color-mix(in srgb,var(--line) 70%,transparent);
}
header.top .inner{max-width:var(--maxw);margin:0 auto;padding:10px var(--pad);display:flex;align-items:center;gap:8px;min-height:54px}
.logo{display:flex;align-items:center;gap:9px;color:var(--ink);font-weight:750;font-size:17px;letter-spacing:.2px}
.logo .mark{width:26px;height:26px;border-radius:9px;background:linear-gradient(145deg,#4d82ff,#2f6bff 55%,#7a5cff);display:grid;place-items:center;box-shadow:0 4px 10px rgba(47,107,255,.28)}
.logo .mark svg{width:15px;height:15px;stroke:#fff;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.sp{flex:1}
.who{display:flex;align-items:center;gap:7px;color:var(--ink-2);font-size:13.5px;font-weight:600}
.who .dot{width:6px;height:6px;border-radius:50%;background:var(--ok)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-height:38px;padding:0 15px;border-radius:11px;border:1px solid var(--line);
  background:var(--card);color:var(--ink);font:600 14px/1 inherit;cursor:pointer;
  transition:transform .12s ease, box-shadow .18s ease, background .18s ease, border-color .18s;
}
.btn:active{transform:scale(.97)}
.btn:hover{border-color:color-mix(in srgb,var(--ink) 18%,transparent)}
.btn.primary{background:linear-gradient(180deg,#3d77ff,#2f6bff);border-color:#2f6bff;color:#fff;box-shadow:0 4px 12px rgba(47,107,255,.25)}
.btn.primary:hover{box-shadow:0 6px 18px rgba(47,107,255,.32)}
.btn.ghost{background:transparent;border-color:transparent;color:var(--sub)}
.btn.ghost:hover{background:var(--bg-soft);color:var(--ink)}
.btn.sm{min-height:32px;padding:0 11px;font-size:13px;border-radius:9px}
.btn.block{width:100%;min-height:46px;font-size:15px}
.btn[disabled]{opacity:.5;pointer-events:none}

/* ---------- 卡片 ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--shadow-1);padding:18px;margin:14px 0;
}
.card.flush{padding:0;overflow:hidden}

/* ---------- 发帖框 ---------- */
.composer{display:flex;gap:12px;align-items:flex-start}
.composer .body{flex:1;min-width:0}
textarea.compose{
  width:100%;border:0;background:transparent;color:var(--ink);font:16px/1.7 inherit;
  resize:none;outline:none;min-height:56px;padding:6px 0;overflow:hidden;
}
textarea.compose::placeholder{color:var(--sub)}
.tools{display:flex;align-items:center;gap:6px;margin-top:10px;padding-top:12px;border-top:1px solid var(--line)}
.tool{
  display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 10px;border-radius:9px;
  border:1px solid transparent;background:transparent;color:var(--sub);font:500 13.5px/1 inherit;cursor:pointer;
  transition:.16s;
}
.tool:hover{background:var(--bg-soft);color:var(--ink)}
.tool.active{background:var(--brand-weak);color:var(--brand);border-color:color-mix(in srgb,var(--brand) 25%,transparent)}
.counter{font-variant-numeric:tabular-nums;font-size:12.5px;color:var(--sub);margin-left:auto;padding-right:4px}
.counter.warn{color:var(--danger)}

/* 开关 */
.switch{display:inline-flex;align-items:center;gap:8px;cursor:pointer;user-select:none}
.switch input{position:absolute;opacity:0;width:0;height:0}
.switch .track{width:38px;height:22px;border-radius:99px;background:var(--bg-soft);border:1px solid var(--line);position:relative;transition:.2s;flex:none}
.switch .track::after{content:"";position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:var(--card);box-shadow:0 1px 2px rgba(0,0,0,.2);transition:.2s}
.switch input:checked + .track{background:var(--brand);border-color:var(--brand)}
.switch input:checked + .track::after{transform:translateX(16px);background:#fff}
.switch .lbl{font-size:13.5px;color:var(--sub)}

/* ---------- 帖子 ---------- */
.post{padding:18px 18px 12px}
.post-head{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.avatar{
  width:36px;height:36px;border-radius:12px;flex:none;display:grid;place-items:center;
  color:#fff;font-weight:700;font-size:14px;letter-spacing:.3px;
  background:linear-gradient(145deg,#6f9bff,#4d7dff);
}
.avatar.a1{background:linear-gradient(145deg,#7ac0ff,#3d8bff)}
.avatar.a2{background:linear-gradient(145deg,#6f9bff,#4d5cff)}
.avatar.a3{background:linear-gradient(145deg,#9d8cff,#6f5cff)}
.avatar.a4{background:linear-gradient(145deg,#6fe0c8,#20b39a)}
.avatar.a5{background:linear-gradient(145deg,#8fb3ff,#5f7dff)}
.avatar.anon{background:linear-gradient(145deg,#b6bdc9,#8d95a3)}
.meta{min-width:0;line-height:1.35}
.meta .nm{font-weight:650;font-size:14.5px;color:var(--ink);display:flex;align-items:center;gap:6px}
.meta .tm{font-size:12px;color:var(--sub)}
.badge{font-size:10.5px;padding:1px 6px;border-radius:6px;background:var(--brand-weak);color:var(--brand);font-weight:600}
.body-text{white-space:pre-wrap;word-break:break-word;font-size:16px;line-height:1.78;color:var(--ink-2)}
.imgs{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;margin-top:12px}
.imgs img{aspect-ratio:1;object-fit:cover;border-radius:11px;border:1px solid var(--line);cursor:zoom-in;background:var(--bg-soft)}
.imgs.one{grid-template-columns:1fr}
.imgs.one img{aspect-ratio:4/3;max-height:420px}
.acts{display:flex;align-items:center;gap:2px;margin-top:12px;padding-top:8px;border-top:1px solid var(--line)}
.act{
  display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 10px;border:0;border-radius:9px;
  background:transparent;color:var(--sub);font:500 13.5px/1 inherit;cursor:pointer;transition:.16s;
}
.act:hover{background:var(--bg-soft);color:var(--ink)}
.act.liked{color:var(--danger)}
.act.liked .i{fill:currentColor;stroke:currentColor}
.act.pop .i{animation:pop .34s cubic-bezier(.3,1.6,.5,1)}
@keyframes pop{0%{transform:scale(1)}40%{transform:scale(1.35)}100%{transform:scale(1)}}
.act .n{font-variant-numeric:tabular-nums}
.more{margin-left:auto}

/* ---------- 表单 ---------- */
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink-2);margin-bottom:7px}
.field .help{font-size:12.5px;color:var(--sub);margin-top:6px;line-height:1.55}
input[type=text],input[type=tel],input[type=password],textarea,select{
  width:100%;min-height:46px;padding:11px 13px;border:1px solid var(--line);border-radius:12px;
  background:var(--bg);color:var(--ink);font:15px/1.5 inherit;outline:none;transition:.16s;
}
input::placeholder,textarea::placeholder{color:var(--sub)}
input:focus,textarea:focus,select:focus{border-color:var(--brand);background:var(--card);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 12%,transparent)}
textarea{resize:vertical;min-height:96px}

/* 上传区 */
.drop{
  display:block;border:1.5px dashed color-mix(in srgb,var(--ink) 16%,transparent);border-radius:14px;
  padding:20px 18px;text-align:center;color:var(--sub);cursor:pointer;transition:.18s;background:var(--bg);
}
.drop:hover,.drop.on{border-color:var(--brand);background:var(--brand-weak);color:var(--brand)}
.drop .hd{display:flex;flex-direction:column;align-items:center;gap:8px;font-size:13.5px}
.drop .hd strong{color:var(--ink);font-size:14.5px}
.drop input{display:none}
.preview{margin-top:12px;position:relative;display:none}
.preview img{width:100%;border-radius:12px;border:1px solid var(--line);max-height:340px;object-fit:contain;background:#000}
.preview .rm{position:absolute;top:8px;right:8px;width:30px;height:30px;border-radius:50%;border:0;background:rgba(0,0,0,.55);color:#fff;cursor:pointer;display:grid;place-items:center}

/* ---------- 消息页 ---------- */
.notice{max-width:420px;margin:44px auto;text-align:center;padding:32px 22px}
.notice .ic{width:56px;height:56px;border-radius:18px;background:var(--brand-weak);color:var(--brand);display:grid;place-items:center;margin:0 auto 16px}
.notice.err .ic{background:color-mix(in srgb,var(--danger) 12%,transparent);color:var(--danger)}
.notice h1{font-size:19px;margin:0 0 8px}
.notice p{color:var(--sub);font-size:14px;margin:0 0 20px;word-break:break-word}
.notice code{display:block;font-size:11.5px;color:var(--sub);background:var(--bg-soft);padding:8px 10px;border-radius:8px;margin-bottom:18px;text-align:left;overflow:auto}

/* ---------- 空状态 ---------- */
.empty{text-align:center;padding:64px 20px;color:var(--sub)}
.empty .ic{width:64px;height:64px;border-radius:22px;background:var(--card);border:1px solid var(--line);display:grid;place-items:center;margin:0 auto 14px;color:var(--sub);box-shadow:var(--shadow-1)}
.empty p{margin:0;font-size:14px}

/* ---------- 标题 ---------- */
h1{font-size:22px;font-weight:750;letter-spacing:-.2px;margin:20px 0 4px}
h2{font-size:15px;font-weight:700;margin:0 0 12px;letter-spacing:.1px}
.lede{color:var(--sub);font-size:13.5px;margin:0 0 16px;line-height:1.6}
.divider{height:1px;background:var(--line);margin:14px 0}

/* ---------- 评论 ---------- */
.cmt{display:flex;gap:10px;padding:12px 0;border-bottom:1px solid var(--line)}
.cmt:last-of-type{border-bottom:0}
.cmt .avatar{width:30px;height:30px;border-radius:10px;font-size:12px}
.cmt .c-body{flex:1;min-width:0}
.cmt .c-top{display:flex;align-items:baseline;gap:8px;font-size:12.5px;color:var(--sub)}
.cmt .c-top b{color:var(--ink-2);font-size:13.5px;font-weight:650}
.cmt .c-txt{font-size:15px;line-height:1.7;white-space:pre-wrap;word-break:break-word;margin-top:2px}
.cmt-form{position:sticky;bottom:0;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);padding:10px 0 calc(10px + var(--safe-b));margin-top:14px;border-top:1px solid var(--line)}
.cmt-form .row{display:flex;gap:8px;align-items:flex-end;flex-wrap:nowrap}
.cmt-form textarea{min-height:44px;height:44px;padding:11px 13px;resize:none;border-radius:22px}

/* ---------- 表格 / 后台 ---------- */
table{width:100%;border-collapse:collapse;font-size:13.5px}
th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--sub);font-weight:600;font-size:12px}
.stat{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:14px 0}
.stat .box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;text-align:center}
.stat .box b{display:block;font-size:20px;font-variant-numeric:tabular-nums}
.stat .box span{font-size:11.5px;color:var(--sub)}
.admin-item{border-bottom:1px solid var(--line);padding:14px 0}
.admin-item:last-child{border-bottom:0}
.admin-item .txt{white-space:pre-wrap;margin:8px 0;font-size:14.5px}
.admin-item .kv{font-size:12px;color:var(--sub)}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:calc(26px + var(--safe-b));transform:translate(-50%,16px);
  background:#1c2028;color:#fff;padding:11px 18px;border-radius:12px;font-size:13.5px;
  box-shadow:0 8px 30px rgba(0,0,0,.28);opacity:0;pointer-events:none;transition:.26s;z-index:60;
  max-width:calc(100vw - 40px);text-align:center;
}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media (prefers-color-scheme: dark){.toast{background:#e9ecf2;color:#14161b}}

footer{max-width:var(--maxw);margin:28px auto 0;padding:0 var(--pad);color:var(--sub);font-size:11.5px;text-align:center;line-height:1.7}
.pager{display:flex;justify-content:center;align-items:center;gap:12px;margin:20px 0}
.row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.tag{display:inline-block;font-size:11.5px;padding:2px 8px;border-radius:7px;border:1px solid var(--line);color:var(--sub);background:var(--bg)}
.tag.ok{border-color:color-mix(in srgb,var(--ok) 30%,transparent);color:var(--ok);background:color-mix(in srgb,var(--ok) 8%,transparent)}
.tag.warn{border-color:color-mix(in srgb,var(--warn) 35%,transparent);color:#a86a00;background:color-mix(in srgb,var(--warn) 10%,transparent)}
.muted{color:var(--sub);font-size:13px}

/* 示例截图预览 */
.lightbox{position:fixed;inset:0;background:rgba(8,10,14,.9);z-index:95;display:none;place-items:center;padding:18px}
.lightbox.show{display:grid}
.lightbox .lb-inner{max-width:100%;max-height:100%;text-align:center}
.lightbox img{max-height:78vh;width:auto;max-width:100%;border-radius:14px;box-shadow:0 20px 60px rgba(0,0,0,.5);margin:0 auto}
.lightbox .lb-cap{color:#e6e9ef;font-size:12.5px;margin-top:12px;line-height:1.6}
.lightbox .lb-close{position:absolute;top:16px;right:16px;width:36px;height:36px;border-radius:50%;border:0;background:rgba(255,255,255,.14);color:#fff;display:grid;place-items:center;cursor:pointer}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -4px}
.table-wrap table{min-width:520px}
.table-wrap th,.table-wrap td{white-space:nowrap}

/* 窄屏把用户表变成卡片，避免横向滚动看不见操作 */
@media (max-width:560px){
  .table-wrap{margin:0;overflow:visible}
  .table-wrap table{min-width:0;display:block}
  .table-wrap thead{display:none}
  .table-wrap tbody{display:block}
  .table-wrap tr{display:block;border:1px solid var(--line);border-radius:12px;background:var(--bg);padding:10px 12px;margin-bottom:10px}
  .table-wrap td{display:flex;justify-content:space-between;align-items:center;gap:12px;border:0;padding:4px 0;white-space:normal}
  .table-wrap td::before{content:attr(data-label);color:var(--sub);font-size:12px;flex:none}
  .table-wrap td .tag{white-space:nowrap}
}