/* ===== 习思家教 —— 学院风（深蓝 + 金）全站样式，桌面 + 手机端适配 ===== */
:root{
  --blue:#0f2a5c; --blue2:#1a3a73; --blue3:#eaf0fb;
  --gold:#c9a227; --gold2:#e6c768;
  --ink:#223; --muted:#6b7a93; --line:#e3e8f2;
  --ok:#1f9d55; --err:#d64550; --warn:#d68a1f;
  --radius:12px; --shadow:0 4px 18px rgba(15,42,92,.08);
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:#f6f8fc;line-height:1.6;-webkit-tap-highlight-color:transparent}
.container{max-width:1120px;margin:0 auto;padding:0 20px}
a{color:var(--blue2);text-decoration:none}
img{max-width:100%}
h1,h2,h3{margin:.3em 0;line-height:1.25}
.muted{color:var(--muted)} .mt{margin-top:20px}
.tag{display:inline-block;padding:2px 9px;border-radius:20px;font-size:12px;background:#eef1f7;color:#556;white-space:nowrap}
.tag.green{background:#e5f6ec;color:var(--ok)} .tag.gray{background:#eef1f4;color:#778}

/* ---------- 品牌 ---------- */
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:19px;white-space:nowrap}
.brand .logo{width:34px;height:34px;border-radius:50%;object-fit:cover;border:2px solid var(--gold2)}

/* ---------- 顶栏 ---------- */
.topbar{background:linear-gradient(90deg,var(--blue),var(--blue2));color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 2px 10px rgba(0,0,0,.12)}
.topbar-in{display:flex;align-items:center;gap:18px;min-height:58px;flex-wrap:wrap}
.nav{display:flex;gap:18px;flex:1}
.nav a{color:#dbe6fb;font-size:14px;padding:4px 2px;border-bottom:2px solid transparent}
.nav a:hover{color:#fff;border-color:var(--gold2)}
.nav-actions{margin-left:auto;display:flex;align-items:center;gap:10px}
.who{font-size:14px;opacity:.85}
.ws-title{font-size:13px;opacity:.75}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:9px;font-weight:600;font-size:14px;padding:10px 18px;cursor:pointer;border:1px solid transparent;transition:.15s;text-align:center}
.btn.primary{background:linear-gradient(90deg,var(--gold),#d9b545);color:#241c02}
.btn.primary:hover{filter:brightness(1.06)}
.btn.ghost{border-color:var(--blue2);color:var(--blue2);background:#fff}
.btn.ghost.light{border-color:var(--gold2);color:#fff;background:transparent}
.btn.danger{border-color:var(--err);color:var(--err);background:#fff}
.btn.w100{width:100%}
.btn.sm{padding:6px 12px;font-size:13px;border-radius:8px}
.btn.xs{padding:3px 8px;font-size:12px;border-radius:6px}

/* ---------- 首页 Hero ---------- */
.hero{background:radial-gradient(1200px 500px at 80% -10%,#2a4a86,var(--blue) 55%);color:#fff;padding:64px 0 48px}
.hero-in h1{font-size:44px;letter-spacing:1px;margin-bottom:14px}
.lead{max-width:640px;font-size:16px;color:#d7e2f7;margin-bottom:26px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.stats{display:flex;gap:14px;flex-wrap:wrap;margin-top:38px}
.stats>div{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:10px;padding:12px 16px;min-width:150px}
.stats b{display:block;font-size:15px;color:var(--gold2)} .stats span{font-size:12px;color:#c9d6f0}

/* ---------- 区块 ---------- */
.section{padding:52px 0}
.section.alt{background:#fff}
.sec-title{font-size:26px;color:var(--blue);text-align:center;margin-bottom:8px}
.sec-title span{display:block;font-size:14px;color:var(--muted);font-weight:400;margin-top:4px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.card .ic{font-size:22px;color:var(--gold);font-weight:700}
.card h3{margin-top:8px;font-size:17px;color:var(--blue)} .card p{font-size:13px;color:#445;margin:.4em 0}

.flow{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:26px}
.fstep{background:#f6f9ff;border:1px solid var(--line);border-radius:12px;padding:18px}
.fstep b{display:inline-block;width:30px;height:30px;line-height:30px;text-align:center;border-radius:50%;background:var(--blue);color:#fff;font-size:15px;margin-bottom:8px}
.fstep h4{margin:.2em 0;color:var(--blue)} .fstep p{font-size:13px;color:#556;margin:0}

.two{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:24px}
.panel{background:var(--blue3);border:1px solid var(--line);border-radius:12px;padding:22px}
.panel h3{color:var(--blue)} .panel ul{padding-left:20px;font-size:14px;color:#335}
.panel li{margin:6px 0} .panel .btn{margin-top:10px}

.timeline{margin-top:26px;border-left:3px solid var(--gold);padding-left:20px;display:flex;flex-direction:column;gap:14px}
.titem{display:flex;gap:12px;align-items:center}
.titem b{background:var(--blue);color:#fff;border-radius:8px;padding:6px 12px;min-width:52px;text-align:center;font-size:14px}
.titem span{font-size:14px;color:#334}

.footer{background:var(--blue);color:#c9d6f0;text-align:center;padding:26px 0;font-size:13px}
.footer .muted{color:#8fa6d4;font-size:12px} code{background:rgba(255,255,255,.12);padding:2px 6px;border-radius:4px}
.footer-links{margin-top:4px;display:flex;justify-content:center;flex-wrap:wrap;gap:4px 16px}
.footer-links a{color:#fff;font-weight:600;font-size:14px}
.footer-links a:hover{color:var(--gold2)}

/* ---------- 省市区三级下拉 ---------- */
.region-box .region-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:4px}
.region-box .region-other{display:none;margin-top:8px}

/* ---------- 找老师：本区县/全部切换 ---------- */
.scope-tabs{display:flex;gap:10px;margin:12px 0;flex-wrap:wrap}
.scope-tabs a{padding:8px 16px;border-radius:20px;border:1px solid var(--line);background:#fff;font-size:14px;color:var(--blue2);font-weight:600}
.scope-tabs a.on{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ---------- 表单 ---------- */
form label{display:block;margin:12px 0 4px;font-size:13px;color:#445}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid #cdd6e6;border-radius:8px;font-size:14px;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(201,162,39,.15)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
.form-grid label{display:block}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.chip{display:inline-flex;align-items:center;gap:5px;border:1px solid #cdd6e6;border-radius:20px;padding:5px 12px;font-size:13px;cursor:pointer;margin:0!important;background:#fff}
.chip input{width:auto}
.chip-inline{display:inline-flex;align-items:center;gap:5px;margin:0 10px 6px 0!important;font-size:13px}
.chip-inline input{width:auto}
.filters{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}
.filters input{max-width:220px}
.inline-form{display:inline;margin:0 4px} .inline-form input{width:auto;display:inline-block;margin-right:4px}
.hint{font-size:12px;color:var(--muted);margin:6px 0}

/* ---------- 弹窗/提示 ---------- */
.alert{border-radius:10px;padding:12px 14px;font-size:14px;margin:12px 0}
.alert.ok{background:#e5f6ec;color:#14603a;border:1px solid #b7e6c9}
.alert.err{background:#fdecee;color:#a2323b;border:1px solid #f3c1c6}
.alert.warn{background:#fdf3e3;color:#8a5a12;border:1px solid #f0d9ad}

/* ---------- 认证页 ---------- */
.auth-body{background:radial-gradient(900px 460px at 75% -10%,#2a4a86,var(--blue) 55%);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.auth-card{background:#fff;border-radius:16px;padding:30px 34px;width:100%;max-width:400px;box-shadow:0 20px 60px rgba(0,0,0,.25)}
.auth-card.wide{max-width:640px}
.auth-card .brand{color:var(--blue);justify-content:center}
.auth-card .sub{text-align:center;color:var(--muted);font-size:13px;margin:6px 0 16px}
.auth-card .brand .logo{width:52px;height:52px;border:2px solid var(--gold)}
.auth-links{display:flex;justify-content:space-between;font-size:13px;margin-top:16px}
.auth-links a{color:var(--blue2)}

/* ---------- 工作台布局 ---------- */
.dash .layout{display:flex;min-height:calc(100vh - 58px);align-items:flex-start}
.dash .side{width:190px;background:#fff;border-right:1px solid var(--line);padding:16px 10px;position:sticky;top:58px;flex-shrink:0}
.dash .side a{display:block;padding:10px 12px;border-radius:8px;font-size:14px;color:#445;margin-bottom:4px}
.dash .side a:hover{background:var(--blue3)}
.dash .side a.on{background:var(--blue);color:#fff;font-weight:600}
.dash .main{flex:1;min-width:0;padding:24px 0 60px}
.dash .main h2{color:var(--blue);font-size:22px;border-left:4px solid var(--gold);padding-left:10px}
.dash .main h3{color:var(--blue);font-size:17px}

/* ---------- 统计卡 ---------- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin:18px 0}
.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;box-shadow:var(--shadow)}
.stat b{display:block;font-size:22px;color:var(--blue)}
.stat span{font-size:12px;color:var(--muted)}

/* ---------- 表格 ---------- */
table{width:100%;border-collapse:collapse;background:#fff;border-radius:10px;overflow:hidden;box-shadow:var(--shadow);font-size:13px}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{background:#f1f5fd;color:var(--blue);font-weight:600;white-space:nowrap}
tbody tr:hover{background:#f8fafd}
.ops{white-space:nowrap}

/* ---------- 找老师 ---------- */
.tutor-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-top:16px}
.tutor-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:var(--shadow)}
.tutor-card .tc-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.tutor-card b{font-size:16px;color:var(--blue)} .tutor-card p{font-size:13px;margin:.25em 0}

/* ---------- 课时包 ---------- */
.pkg-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin:14px 0}
.pkg{border:1px solid var(--line);border-radius:12px;padding:14px;cursor:pointer;display:flex;flex-direction:column;gap:4px}
.pkg:has(input:checked){border-color:var(--gold);box-shadow:0 0 0 3px rgba(201,162,39,.18)}
.pkg b{color:var(--blue);font-size:16px} .pkg span{font-size:13px}

/* ---------- 手机端 ---------- */
@media (max-width:640px){
  .container{padding:0 14px}
  .nav{display:none}
  .topbar-in{min-height:52px;gap:8px}
  .brand .logo{width:28px;height:28px}
  .brand-name{font-size:15px;max-width:130px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .ws-title{display:none}
  .who{display:none}
  .nav-actions{gap:6px}
  .nav-actions .btn{padding:5px 10px;font-size:12px;white-space:nowrap}
  .hero{padding:40px 0 34px}
  .hero-in h1{font-size:30px}
  .lead{font-size:14px}
  .stats>div{min-width:calc(50% - 7px);flex:1 1 45%}
  .cards,.flow{grid-template-columns:1fr}
  .two{grid-template-columns:1fr}
  .sec-title{font-size:22px}
  .form-grid{grid-template-columns:1fr}
  .auth-card{padding:22px 18px}
  .dash .layout{flex-direction:column}
  .dash .side{position:sticky;top:0;z-index:40;width:100%;border-right:none;border-bottom:1px solid var(--line);display:flex;gap:6px;overflow-x:auto;padding:8px 10px;box-shadow:0 2px 8px rgba(15,42,92,.06)}
  .dash .side a{white-space:nowrap;padding:8px 12px;font-size:13px;margin-bottom:0}
  .dash .main{padding:16px 0 50px}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  /* 表格卡片化 */
  table{display:block;white-space:normal}
  table thead{display:none}
  table tbody,table tr,table td{display:block;width:100%}
  table{border-radius:12px;overflow:hidden}
  table tbody tr{border-bottom:1px solid var(--line);padding:8px 2px}
  table tbody tr:last-child{border-bottom:none}
  table td{display:flex;justify-content:space-between;align-items:center;gap:12px;border:none;padding:7px 12px;flex-wrap:wrap}
  table td::before{content:attr(data-label);font-weight:600;color:var(--blue);white-space:nowrap;flex-shrink:0}
  .ops{white-space:normal}
  .filters input{max-width:100%;flex:1 1 100%}
  .filters .btn{width:auto}
  .inline-form input{width:auto}
  .region-box .region-cols{grid-template-columns:1fr}
  .scope-tabs{flex-wrap:wrap}
  .tutor-card{padding:16px}
}