:root{
  --brand:#0B5FFF; --brand-dark:#0A47B8; --brand-soft:#E8F0FF; --accent:#FF6B35;
  --ink:#0F1B2D; --ink-2:#43536B; --ink-3:#7A879B; --line:#E4E9F0;
  --bg:#F5F7FB; --card:#FFFFFF;
  --shadow:0 10px 30px rgba(15,27,45,.10); --shadow-sm:0 2px 8px rgba(15,27,45,.08);
  --radius:16px;
  --sans:'Inter','PingFang SC','Microsoft YaHei',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.5}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

/* ===== 顶栏 ===== */
.nav{position:sticky;top:0;z-index:500;height:60px;display:flex;align-items:center;gap:8px;
  padding:0 22px;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav .logo{display:flex;align-items:center;gap:10px;margin-right:14px}
.nav .mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),#3D86FF);
  display:grid;place-items:center;color:#fff;font-weight:800;font-size:14px;box-shadow:0 4px 12px rgba(11,95,255,.35)}
.nav .brand{font-weight:800;font-size:15px}
.nav .brand small{display:block;font-size:10px;color:var(--ink-3);font-weight:500}
.nav .links{display:flex;gap:4px;margin-left:8px}
.nav .links a{padding:8px 14px;border-radius:9px;font-size:13.5px;font-weight:600;color:var(--ink-2);transition:.15s}
.nav .links a:hover{background:var(--bg);color:var(--brand)}
.nav .links a.active{background:var(--brand-soft);color:var(--brand-dark)}
.nav .spacer{flex:1}
.nav .lang{border:1px solid var(--line);background:#fff;border-radius:9px;padding:7px 11px;font-size:12.5px;font-weight:700;color:var(--ink-2)}
.nav .lang:hover{border-color:var(--brand);color:var(--brand)}
.nav .user{display:flex;align-items:center;gap:9px;padding-left:8px}
.nav .user img,.nav .user .ava{width:32px;height:32px;border-radius:50%;object-fit:cover;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700;font-size:13px}
.nav .user .un{font-size:13px;font-weight:600}
.nav .user .role{font-size:10px;color:#fff;background:var(--accent);padding:1px 7px;border-radius:10px;font-weight:700;margin-left:2px}
.nav .user .role.member{background:var(--ink-3)}
.nav .logout{border:0;background:transparent;color:var(--ink-3);font-size:12.5px;font-weight:600;padding:6px 8px;border-radius:8px}
.nav .logout:hover{background:#FEECEC;color:#d63535}

.wrap{max-width:1180px;margin:0 auto;padding:28px 22px 60px}
.page-title{font-size:24px;font-weight:800;margin-bottom:4px}
.page-sub{color:var(--ink-3);font-size:14px;margin-bottom:24px}

/* ===== 卡片通用 ===== */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.section{margin-bottom:38px}
.section-head{display:flex;align-items:baseline;gap:10px;margin-bottom:16px}
.section-head h2{font-size:19px;font-weight:800}
.section-head .hint{font-size:12.5px;color:var(--ink-3)}

.btn{border:0;border-radius:10px;padding:10px 18px;font-size:13.5px;font-weight:700;transition:.15s}
.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{background:var(--card);color:var(--ink-2);border:1px solid var(--line)}.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-danger{background:#FEECEC;color:#d63535}.btn-danger:hover{background:#d63535;color:#fff}
.btn-sm{padding:6px 12px;font-size:12.5px}

/* ===== 首页 hero ===== */
.hero{background:linear-gradient(135deg,#0B5FFF,#3D86FF 60%,#5AA0FF);border-radius:22px;padding:38px 40px;color:#fff;
  position:relative;overflow:hidden;margin-bottom:36px;box-shadow:0 16px 40px rgba(11,95,255,.28)}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;background:rgba(255,255,255,.10)}
.hero::before{content:"";position:absolute;right:60px;bottom:-90px;width:200px;height:200px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero h1{font-size:30px;font-weight:800;position:relative}
.hero p{font-size:15px;opacity:.94;margin-top:10px;max-width:640px;position:relative;line-height:1.7}
.hero .chips{margin-top:20px;display:flex;gap:10px;flex-wrap:wrap;position:relative}
.hero .chip{background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.25);padding:7px 15px;border-radius:20px;font-size:13px;font-weight:600}

/* ===== 工具网格 ===== */
.tool-group{margin-bottom:24px}
.tool-group h3{font-size:14px;font-weight:700;color:var(--ink-2);margin-bottom:12px;display:flex;align-items:center;gap:8px}
.tool-group h3::before{content:"";width:4px;height:15px;background:var(--brand);border-radius:2px}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:14px}
.tool-item{display:flex;gap:12px;align-items:flex-start;padding:15px;border-radius:14px;background:var(--card);border:1px solid var(--line);transition:.16s}
.tool-item:hover{border-color:var(--brand);box-shadow:var(--shadow);transform:translateY(-2px)}
.tool-item .ti-ico{width:42px;height:42px;border-radius:11px;background:var(--brand-soft);display:grid;place-items:center;font-size:21px;flex-shrink:0}
.tool-item .ti-nm{font-size:14px;font-weight:700}
.tool-item .ti-desc{font-size:12px;color:var(--ink-3);margin-top:3px;line-height:1.45}

/* ===== 组介绍 ===== */
.team-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.team-card{padding:20px;border-radius:14px;background:var(--card);border:1px solid var(--line)}
.team-card .tc-nm{font-size:16px;font-weight:800}
.team-card .tc-lead{font-size:12px;color:var(--brand-dark);font-weight:600;margin:4px 0 10px}
.team-card .tc-desc{font-size:13px;color:var(--ink-2);line-height:1.6}

/* ===== 地图板块 ===== */
.map-embed{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-sm);height:520px;position:relative}
.map-embed iframe{width:100%;height:100%;border:0}

/* ===== 论坛 ===== */
.forum-layout{display:grid;grid-template-columns:200px 1fr;gap:22px}
.cat-list{list-style:none}
.cat-list li{padding:9px 13px;border-radius:10px;font-size:13.5px;font-weight:600;color:var(--ink-2);cursor:pointer;margin-bottom:3px}
.cat-list li:hover{background:var(--bg)}
.cat-list li.active{background:var(--brand-soft);color:var(--brand-dark)}
.thread-row{display:flex;align-items:center;gap:13px;padding:15px 18px;border-bottom:1px solid var(--line);cursor:pointer;transition:.12s}
.thread-row:hover{background:var(--bg)}
.thread-row:last-child{border-bottom:0}
.thread-row .tr-main{flex:1;min-width:0}
.thread-row .tr-title{font-size:14.5px;font-weight:700}
.thread-row .tr-meta{font-size:12px;color:var(--ink-3);margin-top:3px}
.thread-row .pin{color:var(--accent);font-size:12px;font-weight:700;margin-right:5px}
.thread-row .tr-count{background:var(--brand-soft);color:var(--brand-dark);border-radius:20px;padding:4px 11px;font-size:12px;font-weight:700;flex-shrink:0}
.avatar{width:30px;height:30px;border-radius:50%;object-fit:cover;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700;font-size:12px;flex-shrink:0}

.reply{display:flex;gap:12px;padding:16px 0;border-bottom:1px solid var(--line)}
.reply .r-body{flex:1}
.reply .r-name{font-size:13px;font-weight:700}
.reply .r-time{font-size:11.5px;color:var(--ink-3);margin-left:8px;font-weight:400}
.reply .r-text{font-size:13.5px;color:var(--ink-2);margin-top:5px;white-space:pre-wrap;word-break:break-word}

.field{margin-bottom:14px}
.field label{display:block;font-size:12px;font-weight:700;color:var(--ink-2);margin-bottom:5px}
.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-family:inherit;font-size:13.5px;color:var(--ink)}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.field textarea{resize:vertical;min-height:90px;line-height:1.6}

.modal-mask{position:fixed;inset:0;background:rgba(15,27,45,.5);backdrop-filter:blur(4px);z-index:900;display:none;place-items:center}
.modal-mask.open{display:grid}
.modal{width:min(94vw,540px);background:#fff;border-radius:18px;padding:26px;box-shadow:0 30px 80px rgba(0,0,0,.35);max-height:88vh;overflow:auto}
.modal h3{font-size:18px;font-weight:800;margin-bottom:16px}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:18px}

.empty{text-align:center;padding:50px 20px;color:var(--ink-3)}
.empty .ei{font-size:40px;margin-bottom:10px}
.spinner{border:3px solid var(--line);border-top-color:var(--brand);border-radius:50%;width:28px;height:28px;animation:spin .8s linear infinite;margin:40px auto}
@keyframes spin{to{transform:rotate(360deg)}}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:11px 20px;border-radius:12px;font-size:13.5px;font-weight:600;z-index:1200;opacity:0;transition:.25s;pointer-events:none}
.toast.show{opacity:1}
.toast.err{background:#d63535}

@media(max-width:820px){
  .nav{padding:0 14px;gap:4px}.nav .brand small,.nav .user .un{display:none}
  .nav .links a{padding:8px 10px}
  .forum-layout{grid-template-columns:1fr}
  .hero{padding:28px 22px}.hero h1{font-size:24px}
}