:root{
  --brand:#2f6fed; --brand-d:#1f4fb8;
  --bg:#f3f5f8; --card:#fff; --line:#e3e8ef; --muted:#8b97a7;
  --text:#1f2733; --ok:#1f9d55; --warn:#e08a00; --bad:#d9534f;
  --female:#e85d9c; --male:#2f6fed;
  --shadow:0 1px 3px rgba(20,30,50,.08),0 6px 18px rgba(20,30,50,.06);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--text); -webkit-text-size-adjust:100%;
}
button{font-family:inherit;cursor:pointer;}
.link-btn{background:none;border:none;color:var(--brand);font-size:14px;padding:4px 6px;}

/* ---------- 登录页 ---------- */
.login{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:18px;
  background:linear-gradient(135deg,#2f6fed,#5b8def);}
.login-card{width:100%;max-width:520px;background:#fff;border-radius:18px;padding:26px 22px;box-shadow:var(--shadow);}
.login-card h1{margin:0 0 4px;font-size:24px;text-align:center;color:var(--brand-d);}
.login-card .sub{margin:0 0 20px;text-align:center;color:var(--muted);font-size:14px;}
.login-sec{margin-bottom:20px;}
.login-sec-title{font-size:13px;color:var(--muted);font-weight:700;margin-bottom:10px;letter-spacing:.5px;}
.dorm-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;}
.dorm-grid .dorm-btn{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 0;font-size:16px;font-weight:700;color:var(--text);transition:.12s;}
.dorm-grid .dorm-btn:active{transform:scale(.96);}
.dorm-grid .dorm-btn.f{color:var(--female);border-color:#f6c9e1;}
.dorm-grid .dorm-btn.m{color:var(--male);border-color:#c2d4fb;}
.sup-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.sup-btn{display:flex;flex-direction:column;align-items:center;gap:4px;border:none;border-radius:14px;padding:18px 0;color:#fff;font-size:17px;font-weight:700;}
.sup-btn small{font-size:12px;font-weight:500;opacity:.92;}
.sup-btn.female{background:linear-gradient(135deg,#e85d9c,#f085b8);}
.sup-btn.male{background:linear-gradient(135deg,#2f6fed,#5b8def);}
.sup-btn:active{transform:scale(.97);}
.login-foot{text-align:center;margin-top:6px;}

/* 密码面板 */
#pwdPanel{margin-top:4px;}
.pwd-title{font-size:15px;font-weight:700;text-align:center;color:var(--brand-d);margin-bottom:14px;}
.pwd-input{width:100%;font-size:15px;padding:11px 12px;border:1px solid var(--line);border-radius:10px;outline:none;margin-bottom:10px;box-sizing:border-box;}
.pwd-input:focus{border-color:var(--brand);}
.pwd-err{color:var(--bad);font-size:13px;min-height:18px;margin-bottom:8px;text-align:center;}
.sup-btn.admin{background:linear-gradient(135deg,#3a3f4b,#5b6472);}
.sup-btn:active{transform:scale(.97);}

/* 顶部操作区 */
.app-actions{display:flex;align-items:center;gap:10px;}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(20,28,40,.5);display:flex;align-items:center;justify-content:center;z-index:60;padding:18px;}
.modal-card{width:100%;max-width:340px;background:#fff;border-radius:16px;padding:22px 20px;box-shadow:var(--shadow);}
.modal-card h3{margin:0 0 16px;font-size:18px;text-align:center;color:var(--brand-d);}

/* ---------- 应用页 ---------- */
.app{min-height:100vh;display:flex;flex-direction:column;}
.app-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px;background:linear-gradient(135deg,#2f6fed,#5b8def);color:#fff;box-shadow:var(--shadow);}
.app-title{font-size:16px;font-weight:700;display:flex;align-items:center;gap:8px;}
.app-name{font-size:13px;font-weight:500;opacity:.9;background:rgba(255,255,255,.2);padding:2px 8px;border-radius:20px;}
.app-header .link-btn{color:#fff;}
main{padding:14px;flex:1;max-width:760px;width:100%;margin:0 auto;}

/* ---------- 通用卡片 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:14px;box-shadow:var(--shadow);}
.card h2{margin:0 0 12px;font-size:17px;}
.card h3{margin:0 0 8px;font-size:15px;}
.muted{color:var(--muted);font-size:13px;}

/* 上传区 */
.upload-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:12px;}
.upload-row label{font-size:14px;color:var(--text);}
input[type=date],textarea,select,input[type=text]{
  font-family:inherit;font-size:14px;padding:8px 10px;border:1px solid var(--line);border-radius:9px;outline:none;background:#fff;color:var(--text);width:100%;
}
input[type=date]:focus,textarea:focus,select:focus{border-color:var(--brand);}
.preview{width:100%;border-radius:10px;border:1px solid var(--line);margin-top:10px;display:none;}

.btn{background:var(--brand);color:#fff;border:none;border-radius:10px;padding:10px 16px;font-size:15px;font-weight:600;}
.btn:active{transform:scale(.97);}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand);}
.btn.block{width:100%;}
.btn:disabled{opacity:.5;cursor:not-allowed;}

.file-btn{display:inline-block;background:#eef3ff;color:var(--brand-d);border:1px dashed var(--brand);border-radius:10px;padding:10px 14px;font-size:14px;font-weight:600;}
.file-btn input{display:none;}

/* 状态徽标 */
.badge{display:inline-block;padding:2px 10px;border-radius:20px;font-size:12px;font-weight:700;}
.badge.pending{background:#fff3e0;color:var(--warn);}
.badge.reviewed{background:#e6f6ec;color:var(--ok);}
.grade{display:inline-block;padding:2px 10px;border-radius:8px;font-weight:700;font-size:13px;color:#fff;}
.grade.优{background:var(--ok);}
.grade.良{background:#3a86ff;}
.grade.中{background:var(--warn);}
.grade.差{background:var(--bad);}

/* 寝室长历史列表 */
.rec-item{border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-bottom:12px;}
.rec-item .rec-head{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:#fafbfc;border-bottom:1px solid var(--line);}
.rec-item img{width:100%;display:block;max-height:360px;object-fit:contain;background:#000;}
.rec-body{padding:12px 14px;}
.rec-body .row{margin:4px 0;font-size:14px;}
.rec-body .label{color:var(--muted);margin-right:6px;}

/* 负责人审核列表 */
.dorm-block{margin-bottom:18px;}
.dorm-block .db-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;}
.dorm-block .db-title{font-size:16px;font-weight:700;}
.dorm-block .db-title .g{font-size:12px;color:#fff;background:var(--muted);padding:2px 8px;border-radius:20px;margin-left:6px;}
.g.f{background:var(--female);}
.g.m{background:var(--male);}
.review-img{width:100%;border-radius:10px;border:1px solid var(--line);max-height:420px;object-fit:contain;background:#000;margin-bottom:10px;}
.review-grid{display:grid;grid-template-columns:1fr;gap:10px;}
.grade-pick{display:flex;gap:8px;flex-wrap:wrap;}
.grade-pick button{flex:1;min-width:64px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:10px 0;font-weight:700;font-size:15px;color:var(--muted);}
.grade-pick button.sel-优{background:var(--ok);border-color:var(--ok);color:#fff;}
.grade-pick button.sel-良{background:#3a86ff;border-color:#3a86ff;color:#fff;}
.grade-pick button.sel-中{background:var(--warn);border-color:var(--warn);color:#fff;}
.grade-pick button.sel-差{background:var(--bad);border-color:var(--bad);color:#fff;}

/* 浮动导出按钮 */
.fab{position:fixed;right:18px;bottom:22px;z-index:30;background:linear-gradient(135deg,#1f9d55,#36b86e);color:#fff;border:none;
  border-radius:50px;padding:14px 20px;font-size:15px;font-weight:700;box-shadow:0 6px 20px rgba(31,157,85,.4);display:flex;align-items:center;gap:8px;}
.fab:active{transform:scale(.96);}

/* toast */
.toast{position:fixed;left:50%;bottom:80px;transform:translateX(-50%);background:rgba(20,28,40,.92);color:#fff;
  padding:10px 18px;border-radius:24px;font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:50;max-width:90%;text-align:center;}
.toast.show{opacity:1;}

/* 空态 */
.empty{text-align:center;color:var(--muted);padding:30px 10px;font-size:14px;}

/* ---------- 日历 ---------- */
.cal-card{padding:14px;}
.cal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;}
.cal-title{font-size:16px;font-weight:700;}
.cal-nav{background:#eef3ff;border:1px solid var(--line);color:var(--brand-d);border-radius:8px;width:36px;height:32px;font-size:18px;line-height:1;}
.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;}
.cal-w{text-align:center;font-size:12px;color:var(--muted);padding:4px 0;font-weight:700;}
.cal-cell{position:relative;border:1px solid transparent;background:#f7f9fc;border-radius:10px;padding:8px 0;font-size:14px;color:var(--text);}
.cal-cell.blank{background:transparent;border:none;}
.cal-cell.has{background:#e8f4ff;color:var(--brand-d);font-weight:700;border-color:#c2d4fb;}
.cal-cell.today{box-shadow:inset 0 0 0 2px var(--warn);}
.cal-cell.sel{background:var(--brand);color:#fff;border-color:var(--brand);}
.cal-cell .dot{position:absolute;left:50%;bottom:4px;transform:translateX(-50%);width:5px;height:5px;border-radius:50%;background:var(--brand);}
.cal-cell.sel .dot{background:#fff;}
.cal-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:10px;font-size:13px;}

/* ---------- 管理员操作 ---------- */
.admin-ops{display:flex;gap:8px;margin-top:10px;}
.admin-ops .btn{flex:1;}
.btn.sm{padding:7px 12px;font-size:13px;border-radius:8px;}
.btn.danger{background:var(--bad);}

/* ---------- 账号管理 ---------- */
.users-list{max-height:52vh;overflow:auto;}
.user-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px solid var(--line);}
.user-row:last-child{border-bottom:none;}
.user-name{font-size:15px;font-weight:600;}

/* ---------- 导出弹窗 ---------- */
.exp-opt{display:flex;flex-direction:column;gap:8px;}
.exp-line{display:flex;align-items:center;gap:8px;font-size:14px;}
.exp-line input[type=radio]{width:auto;margin:0;}
.exp-date{margin-left:24px;}
.exp-range{display:flex;align-items:center;gap:8px;margin-left:24px;}
.exp-range input[type=date]{flex:1;}
.exp-range .muted{flex:none;}

@media(max-width:480px){
  .dorm-grid{grid-template-columns:repeat(3,1fr);}
}