:root{
  --brand:#2b5bd7; --brand-dark:#1e40af; --ink:#111827; --sub:#6b7280; --line:#e8edf5;
  --bg:#f6f8fc; --card:#fff; --green:#16a34a; --red:#dc2626; --amber:#d97706;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
     background:var(--bg);color:var(--ink);font-size:14px;line-height:1.6}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}

/* nav */
.nav{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.nav-in{display:flex;align-items:center;gap:18px;height:60px}
.logo{display:flex;align-items:center;gap:9px;font-weight:700;font-size:17px;letter-spacing:.3px}
.logo-badge{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand-dark));
  color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}
.search{flex:1;display:flex;max-width:460px}
.search input{flex:1;height:38px;border:1px solid var(--line);border-right:none;border-radius:9px 0 0 9px;
  padding:0 14px;outline:none;background:#fbfcfe;font-size:13px}
.search input:focus{border-color:var(--brand)}
.search button{height:38px;padding:0 18px;border:1px solid var(--brand);background:var(--brand);color:#fff;
  border-radius:0 9px 9px 0;cursor:pointer;font-size:13px}
.nav-links{display:flex;align-items:center;gap:16px;margin-left:auto;font-size:13px;color:var(--sub)}
.nav-links a:hover{color:var(--brand)}
.btn{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 16px;border-radius:9px;
  background:var(--brand);color:#fff;border:none;cursor:pointer;font-size:13px;transition:.15s}
.btn:hover{background:var(--brand-dark)}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn.ghost:hover{background:#f0f4ff}
.btn.gray{background:#f1f3f8;color:var(--sub);border:1px solid var(--line)}
.btn.gray:hover{background:#e8ecf5}
.btn.sm{height:30px;padding:0 12px;font-size:12px}
.btn[disabled]{opacity:.55;cursor:default}
.btn.danger{background:#fff;color:#dc2626;border:1px solid #f3b3b3}
.btn.danger:hover{background:#fef2f2}
/* 全站公告：三种语气，跟「非官方」提示条共用 notice-bar 的骨架 */
.notice-bar.ann-warn{background:#fffbeb;border-bottom:1px solid #fde68a;color:#92400e}
.notice-bar.ann-danger{background:#fef2f2;border-bottom:1px solid #fecaca;color:#991b1b}
.notice-bar.ann-info{background:#eff6ff;border-bottom:1px solid #bfdbfe;color:#1e40af}
/* 站点简介：跟在站名后面的一行小字，窄屏收掉免得挤爆导航 */
.site-slogan{font-weight:400;font-size:12px;color:var(--sub);letter-spacing:0;
  padding-left:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:220px}
@media (max-width:900px){.site-slogan{display:none}}
.admin-tabs{display:flex;gap:8px;margin:18px 0 12px;flex-wrap:wrap}
.admin-tabs a{height:30px;padding:0 14px;display:inline-flex;align-items:center;border-radius:8px;
  background:#f1f3f8;color:var(--sub);font-size:13px;border:1px solid var(--line)}
.admin-tabs a.on{background:var(--brand);color:#fff;border-color:var(--brand)}

/* hero */
.hero{background:linear-gradient(135deg,#2b5bd7,#1e3a8a);color:#fff;padding:34px 0;margin-bottom:22px}
.hero h1{font-size:25px;font-weight:700;margin-bottom:8px}
.hero p{opacity:.85;font-size:13px}
.hero-stats{display:flex;gap:30px;margin-top:18px}
.hero-stats div b{font-size:20px;display:block}
.hero-stats div span{font-size:12px;opacity:.8}

/* filters */
.filters{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:18px;
  display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.chip{padding:6px 13px;border:1px solid var(--line);border-radius:20px;font-size:12px;color:var(--sub);
  background:#fff;cursor:pointer}
.chip:hover{border-color:var(--brand);color:var(--brand)}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.filters .sep{width:1px;height:20px;background:var(--line)}
.ml{margin-left:auto}

/* grid */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media(max-width:1000px){.grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:720px){.grid{grid-template-columns:repeat(2,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;
  transition:.18s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(15,23,42,.10);border-color:#d6e0f5}
.cover{height:172px;background:#eef2f8;display:flex;align-items:center;justify-content:center;
  font-size:34px;color:#c3ccdd;overflow:hidden}
.cover img{width:100%;height:100%;object-fit:cover}
.card-body{padding:12px 13px 14px;flex:1;display:flex;flex-direction:column}
.title{font-size:14px;font-weight:600;line-height:1.45;height:2.9em;overflow:hidden}
.meta{font-size:12px;color:var(--sub);margin-top:5px}
.price{color:var(--red);font-weight:700;font-size:17px;margin-top:8px}
.price small{font-size:12px;color:var(--sub);font-weight:400;text-decoration:line-through;margin-left:6px}
.tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.tag{font-size:11px;padding:2px 7px;border-radius:4px;background:#f1f4fa;color:var(--sub)}
.tag.brand{background:#eaf0ff;color:var(--brand)}

/* detail */
.detail{display:grid;grid-template-columns:340px 1fr;gap:26px;background:var(--card);
  border:1px solid var(--line);border-radius:14px;padding:22px}
@media(max-width:760px){.detail{grid-template-columns:1fr}}
.big-cover{height:340px;border-radius:12px;background:#eef2f8;display:flex;align-items:center;
  justify-content:center;font-size:74px;color:#c3ccdd;overflow:hidden}
.big-cover img{width:100%;height:100%;object-fit:cover}
.kv{display:grid;grid-template-columns:78px 1fr;gap:6px 12px;margin-top:14px;font-size:13px}
.kv span{color:var(--sub)}
.desc{margin-top:16px;padding:14px;background:#f9fafc;border-radius:10px;font-size:13px;color:#374151;white-space:pre-wrap}

/* forms */
.form{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px;max-width:720px;margin:0 auto}
.field{margin-bottom:15px}
.field label{display:block;font-size:12px;color:var(--sub);margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:10px;
  padding:10px 12px;font-size:14px;outline:none;background:#fbfcfe;font-family:inherit}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(43,91,215,.1)}
.field textarea{min-height:96px;resize:vertical}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:640px){.row2{grid-template-columns:1fr}}

/* table */
.tbl{width:100%;border-collapse:collapse;font-size:13px;background:var(--card);
  border:1px solid var(--line);border-radius:12px;overflow:hidden}
.tbl th{background:#f9fafc;text-align:left;padding:11px 14px;color:var(--sub);font-weight:600;font-size:12px}
.tbl td{padding:11px 14px;border-top:1px solid var(--line)}
.pill{font-size:11px;padding:3px 9px;border-radius:20px;background:#f1f4fa;color:var(--sub)}
.pill.green{background:#e8f7ee;color:var(--green)}
.pill.amber{background:#fdf3e3;color:var(--amber)}
.pill.red{background:#fdeaea;color:var(--red)}
.pill.brand{background:#eaf0ff;color:var(--brand)}

/* tabs */
.tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:16px}
.tabs a{padding:9px 16px;font-size:13px;color:var(--sub);border-bottom:2px solid transparent}
.tabs a.on{color:var(--brand);border-color:var(--brand);font-weight:600}

/* chat */
.chat-wrap{display:grid;grid-template-columns:250px 1fr;gap:16px}
@media(max-width:760px){.chat-wrap{grid-template-columns:1fr}}
.thread{padding:12px 14px;border-radius:10px;background:var(--card);border:1px solid var(--line);margin-bottom:8px}
.thread.on{border-color:var(--brand);background:#f5f8ff}
.bubble{max-width:74%;padding:9px 13px;border-radius:12px;margin-bottom:10px;font-size:13px;word-break:break-word}
.bubble.me{background:var(--brand);color:#fff;margin-left:auto;border-bottom-right-radius:3px}
.bubble.you{background:#fff;border:1px solid var(--line);border-bottom-left-radius:3px}
.bubble .t{font-size:11px;opacity:.7;margin-top:3px}

/* login */
.login-page{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;min-height:calc(100vh - 60px);padding:30px 0}
@media(max-width:860px){.login-page{grid-template-columns:1fr}}
.login-left h1{font-size:30px;line-height:1.35;margin-bottom:14px}
.login-left p{color:var(--sub);font-size:14px}
.pts{margin-top:22px;display:flex;flex-direction:column;gap:12px}
.pt{display:flex;gap:11px;align-items:flex-start}
.pt .ic{width:32px;height:32px;border-radius:9px;background:#eaf0ff;color:var(--brand);display:flex;
  align-items:center;justify-content:center;font-size:15px;flex:none}
.pt b{font-size:13px}
.pt span{font-size:12px;color:var(--sub)}
.login-box{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;
  box-shadow:0 14px 44px rgba(15,23,42,.09)}
.login-box .hd{padding:13px 18px;background:#f9fafc;border-bottom:1px solid var(--line);
  font-size:13px;color:var(--sub);display:flex;align-items:center;gap:8px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--green)}
iframe#cas{border:none;width:100%;height:430px;display:block}
.status{padding:11px 18px;font-size:12px;color:var(--sub);border-top:1px solid var(--line);background:#fcfdff;
  display:flex;align-items:center;gap:8px}
.spin{width:13px;height:13px;border:2px solid #dbe3ef;border-top-color:var(--brand);border-radius:50%;
  animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

/* admin */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}
@media(max-width:860px){.cards{grid-template-columns:repeat(2,1fr)}}
.stat{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.stat .lab{font-size:12px;color:var(--sub)}
.stat .val{font-size:24px;font-weight:700;margin-top:4px}
.stat .sub{font-size:11px;color:var(--sub);margin-top:2px}
.bars{display:flex;align-items:flex-end;gap:10px;height:130px;padding:14px 18px;background:var(--card);
  border:1px solid var(--line);border-radius:12px}
.bar{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;height:100%;justify-content:flex-end}
.bar .col{width:100%;max-width:26px;background:linear-gradient(180deg,#6d92ee,var(--brand));border-radius:5px 5px 0 0;min-height:2px}
.bar .lb{font-size:10px;color:var(--sub)}
.panel{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px}
.panel h3{font-size:14px;margin-bottom:12px}
.empty{text-align:center;padding:50px 0;color:var(--sub);font-size:13px}
.foot{text-align:center;color:var(--sub);font-size:12px;padding:26px 0}
.alert{background:#fdf3e3;color:var(--amber);padding:10px 14px;border-radius:10px;font-size:12px;margin-bottom:14px}
.alert.warn{background:#fff7ed;color:#9a3412;border:1px solid #fed7aa}

/* 非官方标识 */
.tag-unofficial{display:inline-flex;align-items:center;height:19px;padding:0 7px;border-radius:5px;
  background:#fff7ed;color:#c2410c;border:1px solid #fdba74;font-size:11px;font-weight:700;
  letter-spacing:.3px;line-height:1;white-space:nowrap;cursor:help;vertical-align:middle}
.notice-bar{background:#fffbeb;border-bottom:1px solid #fde68a;color:#92400e;font-size:12.5px}
.notice-bar .notice-in{display:flex;align-items:center;gap:10px;padding:9px 20px;
  max-width:1180px;margin:0 auto}
.notice-bar .txt{flex:1;line-height:1.5}
.notice-bar button{flex:none;height:26px;padding:0 12px;border-radius:7px;font-size:12px;cursor:pointer;
  background:#fff;color:#92400e;border:1px solid #fcd34d}
.notice-bar button:hover{background:#fef3c7}
.foot-disclaimer{max-width:760px;margin:0 auto 10px;line-height:1.6;color:#9a3412;
  background:#fff7ed;border:1px solid #fed7aa;border-radius:10px;padding:10px 14px}

/* 未读红点 */
.dot-n{display:inline-flex;align-items:center;justify-content:center;min-width:17px;height:17px;
  padding:0 5px;margin-left:5px;border-radius:9px;background:#dc2626;color:#fff;
  font-size:11px;font-weight:600;line-height:1;vertical-align:middle}

/* 通知中心 / 求书区 */
.notif{display:flex;gap:12px;align-items:flex-start;padding:12px 4px;border-top:1px solid var(--line)}
.notif:first-child{border-top:none}
.notif.un{background:#f8faff;border-radius:8px;padding-left:8px;padding-right:8px}
.notif.un .notif-t{font-weight:600}
.want{display:flex;gap:12px;align-items:center;padding:13px 4px;border-top:1px solid var(--line)}
.want:first-child{border-top:none}

/* 移动端适配 */
@media (max-width:760px){
  .wrap{padding:0 12px}
  .nav-in{height:52px;gap:10px;flex-wrap:wrap}
  .search{max-width:none;order:3;flex-basis:100%}
  .nav-links{gap:10px;font-size:12px;overflow-x:auto;white-space:nowrap}
  .hero{padding:22px 0}
  .hero h1{font-size:20px}
  .detail{grid-template-columns:1fr !important}
  .big-cover{height:220px}
  .chat-wrap{grid-template-columns:1fr !important}
  .chat-wrap>div:first-child{max-height:150px;overflow:auto}
  .filters{flex-wrap:wrap;gap:6px}
  .filters form{margin-left:0 !important;flex-basis:100%}
  .filters form input{width:100% !important}
  .cards{grid-template-columns:repeat(2,1fr) !important}
  .grid{grid-template-columns:repeat(2,1fr) !important}
  .tbl{display:block;overflow-x:auto;white-space:nowrap}
  .panel h3{font-size:13px}
  .admin-tabs a{font-size:12px;padding:0 10px}
  .notice-bar .notice-in{padding:8px 12px;flex-wrap:wrap}
}

/* 退出按钮：外观跟导航里的链接一致，但它是 <button>，必须能发 POST */
.linkbtn{background:none;border:none;padding:0;margin:0;font:inherit;color:inherit;cursor:pointer}
.nav-links .linkbtn:hover{color:var(--brand)}

/* 登录页（邮箱验证码表单） */
.login-form{padding:18px}
.row-inline{display:flex;gap:10px;align-items:center}
.alert.info{background:#eef4ff;color:#1e40af;border:1px solid #c7d7fe}
.row-inline .btn{height:36px;white-space:nowrap}

/* 登录页：验证码 / 密码 二选一的分段控件 */
.seg{display:flex;gap:6px;background:#f1f4f9;border-radius:10px;padding:4px;margin-bottom:16px}
.seg button{flex:1;border:none;background:none;border-radius:8px;padding:8px 0;font:inherit;
  font-size:13px;color:var(--sub);cursor:pointer}
.seg button.on{background:#fff;color:var(--brand);font-weight:600;box-shadow:0 1px 3px rgba(0,0,0,.08)}