/* Air 系列官方论坛 — 暗色 · 与官网同一设计语言 · 手机优先 */
:root {
  --bg: #0B0F17; --bg-elev: #101623; --card: #151D2B; --card-hover: #1A2434;
  --border: rgba(255,255,255,.08); --border-bright: rgba(120,170,255,.35);
  --text: #E8EEF7; --text-dim: #93A1B5; --text-faint: #5B6B82;
  --primary: #4F8CFF; --accent: #22D3EE;
  --grad: linear-gradient(135deg, #4F8CFF 0%, #22D3EE 100%);
  --ok: #34D399; --warn: #FBBF24; --danger: #F87171;
  --radius: 16px; --radius-sm: 10px;
  --font: -apple-system, "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg); color: var(--text); font-family: var(--font);
  line-height: 1.65; -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; cursor: pointer; }
::selection { background: rgba(79,140,255,.35); }

/* 顶栏 */
.fnav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11,15,23,.9); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.fnav-in {
  max-width: 960px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px; min-height: 54px;
}
.flogo { display: flex; align-items: center; gap: 9px; color: var(--text); font-weight: 700; font-size: 16px; }
.fmark {
  width: 30px; height: 30px; border-radius: 9px; background: var(--grad);
  display: grid; place-items: center; color: #fff; font-weight: 800;
  box-shadow: 0 2px 12px rgba(79,140,255,.4);
}
.fname b { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.flinks { display: flex; gap: 16px; font-size: 14px; color: var(--text-dim); }
.flinks a { color: var(--text-dim); }
.flinks a:hover { color: var(--text); text-decoration: none; }
.fuser { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.fme { display: flex; align-items: center; gap: 7px; color: var(--text); }
.fme:hover { text-decoration: none; }
.uname { font-size: 14px; font-weight: 600; max-width: 96px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ava {
  width: 28px; height: 28px; border-radius: 50%; background: var(--grad); color: #fff;
  display: inline-grid; place-items: center; font-size: 14px; font-weight: 700; flex-shrink: 0;
}
.ava.big { width: 42px; height: 42px; font-size: 19px; }
.ava.xl { width: 56px; height: 56px; font-size: 25px; }
.ftag-admin {
  font-size: 10.5px; color: var(--warn); border: 1px solid rgba(251,191,36,.4);
  padding: 1px 7px; border-radius: 999px; white-space: nowrap;
}
.inline { display: inline; }

/* 按钮 */
.fbtn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--grad); color: #fff; border: none; border-radius: 999px;
  padding: 9px 20px; font-size: 14px; font-weight: 600; text-decoration: none;
  box-shadow: 0 4px 18px rgba(79,140,255,.3); transition: transform .15s, box-shadow .2s;
}
.fbtn:hover { transform: translateY(-1px); text-decoration: none; box-shadow: 0 8px 24px rgba(79,140,255,.4); }
.fbtn.big { padding: 12px 28px; font-size: 15px; }
.fbtn.wide { width: 100%; margin-top: 6px; }
.fbtn-ghost {
  display: inline-flex; align-items: center; background: none; color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 999px; padding: 7px 16px; font-size: 13.5px;
  text-decoration: none; transition: color .2s, border-color .2s;
}
.fbtn-ghost:hover { color: var(--text); border-color: var(--border-bright); text-decoration: none; }
.fbtn-ghost.big { padding: 12px 28px; font-size: 15px; }
.fbtn-mini {
  background: rgba(255,255,255,.05); color: var(--text-dim); border: 1px solid var(--border);
  border-radius: 6px; padding: 2px 9px; font-size: 12px;
}
.fbtn-mini:hover { color: var(--text); border-color: var(--border-bright); }
.fbtn-mini.danger { color: var(--danger); border-color: rgba(248,113,113,.3); }
.fbtn-mini.danger:hover { border-color: var(--danger); }

/* 主体 */
.fmain { max-width: 960px; margin: 0 auto; padding: 18px 16px 60px; }
.flash {
  background: rgba(52,211,153,.1); border: 1px solid rgba(52,211,153,.35); color: var(--ok);
  border-radius: var(--radius-sm); padding: 10px 16px; font-size: 14px; margin-bottom: 14px;
}
.ferr {
  background: rgba(248,113,113,.08); border: 1px solid rgba(248,113,113,.35); color: var(--danger);
  border-radius: var(--radius-sm); padding: 10px 16px; font-size: 14px; margin-bottom: 14px;
}
.fempty {
  background: var(--card); border: 1px dashed var(--border); color: var(--text-faint);
  border-radius: var(--radius); padding: 34px 20px; text-align: center; font-size: 14.5px;
}
.fempty.cta { margin-top: 18px; }

/* 首页 hero */
.fhero {
  background: radial-gradient(circle at 85% 20%, rgba(79,140,255,.14), transparent 55%), var(--bg-elev);
  border: 1px solid var(--border); border-radius: 20px;
  padding: 30px 24px; margin-bottom: 22px;
}
.fhero h1 { font-size: 30px; font-weight: 800; letter-spacing: -.5px; margin-bottom: 8px; }
.fhero p { color: var(--text-dim); font-size: 14.5px; }
.fhero-cta { margin-top: 18px; display: flex; gap: 12px; flex-wrap: wrap; }

.fsec { font-size: 17px; font-weight: 700; margin: 26px 0 12px; }

/* 板块卡 */
.blist { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.bcard {
  display: flex; justify-content: space-between; align-items: center; gap: 14px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; color: var(--text); transition: border-color .2s, transform .18s, background .2s;
}
.bcard:hover { border-color: var(--border-bright); transform: translateY(-3px); text-decoration: none; background: var(--card-hover); }
.bname { font-size: 15.5px; font-weight: 700; margin-bottom: 5px; }
.bdesc { font-size: 12.5px; color: var(--text-dim); }
.bstat { display: grid; grid-template-columns: auto auto; gap: 1px 8px; text-align: right; flex-shrink: 0; }
.bstat b { font-size: 16px; font-variant-numeric: tabular-nums; }
.bstat span { font-size: 10.5px; color: var(--text-faint); }

/* 主题行 */
.tlist {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
.trow {
  display: flex; align-items: center; gap: 10px; padding: 13px 16px;
  border-bottom: 1px solid rgba(255,255,255,.04); color: var(--text);
}
.trow:last-child { border-bottom: none; }
.trow:hover { background: var(--card); text-decoration: none; }
.tboard {
  flex-shrink: 0; font-size: 11px; color: var(--accent); background: rgba(34,211,238,.08);
  border: 1px solid rgba(34,211,238,.25); padding: 1px 9px; border-radius: 999px;
}
.fpin {
  flex-shrink: 0; font-size: 11px; color: var(--warn); background: rgba(251,191,36,.1);
  border: 1px solid rgba(251,191,36,.35); padding: 1px 8px; border-radius: 999px;
}
.flock {
  flex-shrink: 0; font-size: 11px; color: var(--text-faint); background: rgba(255,255,255,.04);
  border: 1px solid var(--border); padding: 1px 8px; border-radius: 999px;
}
.ttitle {
  flex: 1; min-width: 0; font-size: 14.5px; font-weight: 500;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.tmeta { flex-shrink: 0; font-size: 12px; color: var(--text-faint); }
@media (max-width: 640px) {
  .trow { flex-wrap: wrap; }
  .ttitle { flex-basis: 100%; order: 1; white-space: normal; }
  .tboard { order: 0; } .fpin, .flock { order: 2; }
  .tmeta { order: 3; margin-left: auto; }
}

/* 板块头 */
.fhead-row { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-bottom: 16px; flex-wrap: wrap; }
.fhead-row h1 { font-size: 24px; font-weight: 800; }
.fsub { color: var(--text-dim); font-size: 13.5px; margin-top: 3px; }
.fbread { font-size: 13px; color: var(--text-faint); margin-bottom: 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.fbread a { color: var(--text-dim); }
.ttitle-big { font-size: 22px; font-weight: 800; line-height: 1.4; margin-bottom: 14px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.admin-bar { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }

/* 帖子 */
.plist { display: flex; flex-direction: column; gap: 12px; }
.post {
  display: flex; gap: 14px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
}
.post:target { border-color: var(--border-bright); }
.pside {
  flex-shrink: 0; width: 92px; display: flex; flex-direction: column; align-items: center; gap: 6px;
  text-align: center;
}
.pname { font-size: 13px; font-weight: 600; color: var(--text); word-break: break-all; }
.pbody { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.pcontent { font-size: 14.5px; line-height: 1.8; color: var(--text); word-break: break-word; flex: 1; }
.pcontent a { word-break: break-all; }
.pfoot {
  display: flex; align-items: center; gap: 12px; margin-top: 12px; padding-top: 10px;
  border-top: 1px dashed rgba(255,255,255,.06); font-size: 12px; color: var(--text-faint);
}
.pfloor { color: var(--accent); font-weight: 600; }
@media (max-width: 560px) {
  .post { flex-direction: column; gap: 10px; }
  .pside {
    width: 100%; flex-direction: row; justify-content: flex-start; text-align: left; gap: 9px;
  }
}

/* 回复框 */
.reply-box, .fauth-form {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-top: 18px;
}
.flabel { display: block; font-size: 13px; color: var(--text-dim); margin: 12px 0 6px; }
.flabel:first-child { margin-top: 0; }
.reply-box textarea, .fauth-form textarea, .reply-box input[type=text], .fauth-form input[type=text],
.fauth-form input[type=password], .fsel {
  width: 100%; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-size: 16px; font-family: inherit; padding: 11px 14px; outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.reply-box textarea:focus, .fauth-form input:focus, .fauth-form textarea:focus, .fsel:focus {
  border-color: var(--border-bright); box-shadow: 0 0 0 3px rgba(79,140,255,.12);
}
.reply-box textarea { resize: vertical; min-height: 110px; }
.fsel { appearance: none; -webkit-appearance: none; }
.hp { position: absolute !important; left: -9999px; height: 0; width: 0; opacity: 0; }
.reply-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 14px; gap: 12px; }
.fhint { font-size: 12px; color: var(--text-faint); }

/* 分页 */
.fpager { display: flex; gap: 8px; justify-content: center; margin: 20px 0; flex-wrap: wrap; }
.fpager a, .fpager .cur {
  min-width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 9px; font-size: 14px; border: 1px solid var(--border); color: var(--text-dim);
}
.fpager a:hover { border-color: var(--border-bright); color: var(--text); text-decoration: none; }
.fpager .cur { background: var(--grad); color: #fff; border-color: transparent; font-weight: 700; }

/* 认证页 */
.fauth { max-width: 420px; margin: 30px auto 0; }
.fauth h1 { font-size: 26px; font-weight: 800; margin-bottom: 6px; }
.fauth .fsub { margin-bottom: 18px; }
.fauth-form { margin-top: 0; }
.fauth-alt { margin-top: 16px; font-size: 14px; color: var(--text-dim); text-align: center; }

/* 个人主页 */
.pmeta { display: flex; align-items: center; gap: 16px; }
.pmeta h1 { font-size: 24px; font-weight: 800; display: flex; align-items: center; gap: 10px; }

/* 页脚 */
.ffoot {
  max-width: 960px; margin: 0 auto; padding: 22px 16px 40px;
  border-top: 1px solid var(--border); color: var(--text-faint); font-size: 12.5px;
  display: flex; flex-direction: column; gap: 6px;
}
.ffoot a { color: var(--text-dim); }

@media (max-width: 640px) {
  .blist { grid-template-columns: 1fr; }
  .fhero h1 { font-size: 24px; }
  .flinks { display: none; }
  .fnav-in { gap: 10px; }
}