:root{
  --blue:#667eea; --purple:#764ba2; --green:#1dd1a1; --accent:#ee5253; --accent2:#feca57;
  --dark:#2d3436; --gray:#888; --light:#f5f6fa; --radius:16px;
  --shadow:0 8px 22px rgba(0,0,0,.15);
}

*{box-sizing:border-box}
body{font-family:'Segoe UI',Roboto,sans-serif;margin:0;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:var(--dark)}
#topbar{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;background:rgba(0,0,0,.15);color:#fff}
.tb-logout{margin-left:12px;padding:6px 14px;border:none;border-radius:8px;background:rgba(255,255,255,.2);color:#fff;cursor:pointer}
.tb-logout:hover{background:rgba(255,255,255,.35)}
#app{max-width:1100px;margin:0 auto;padding:24px 16px}

/* trang chủ */
.home-hero{text-align:center;color:#fff;margin-bottom:20px}
.home-hero h1{font-size:32px;margin:0 0 6px}
.home-hero p{opacity:.9;margin:0}
.menu-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.menu-card{border-radius:var(--radius);padding:26px 22px;cursor:pointer;transition:.25s;box-shadow:0 8px 22px rgba(0,0,0,.18);position:relative;overflow:hidden;color:#fff}
.menu-card::after{content:'';position:absolute;top:-40%;right:-30%;width:150px;height:150px;background:rgba(255,255,255,.18);border-radius:50%}
.menu-card:hover{transform:translateY(-6px) scale(1.02);box-shadow:0 14px 30px rgba(0,0,0,.28)}
.menu-ico{font-size:44px;margin-bottom:12px;position:relative;z-index:1}
.menu-card h3{font-size:19px;margin:0 0 6px;position:relative;z-index:1;text-shadow:0 1px 4px rgba(0,0,0,.25)}
.menu-card p{font-size:13px;color:rgba(255,255,255,.92);margin:0;position:relative;z-index:1}
.pro-tag{position:absolute;top:14px;right:14px;background:var(--accent2);color:var(--dark);font-size:10px;font-weight:800;padding:3px 8px;border-radius:8px;z-index:2}

/* panel chung */
.panel{background:#fff;border-radius:var(--radius);padding:26px;max-width:560px;margin:0 auto;box-shadow:var(--shadow)}
.panel-wide{max-width:880px}
.panel h2{margin:0 0 18px;font-size:24px;font-weight:800}
.back-link{color:#fff;cursor:pointer;margin-bottom:16px;display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;opacity:.92;background:rgba(255,255,255,.14);padding:8px 14px;border-radius:10px}
.back-link:hover{opacity:1;background:rgba(255,255,255,.26)}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;color:var(--gray);margin-bottom:5px;font-weight:600}
.field input,.field textarea,textarea,select{width:100%;padding:11px 13px;border:2px solid #e0e0e0;border-radius:10px;font-size:15px;outline:none;font-family:inherit}
.field input:focus,textarea:focus{border-color:var(--blue)}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;border:none;padding:11px 20px;border-radius:10px;cursor:pointer;font-size:15px;font-weight:600}
.btn-primary:hover{opacity:.92}
.btn-primary:disabled{opacity:.4;cursor:not-allowed}
.btn-full{width:100%;padding:16px;margin-top:6px;font-size:17px;font-weight:700;letter-spacing:.3px}
.btn-danger{background:linear-gradient(135deg,#e63946,#c1121f);color:#fff;border:none;padding:8px 16px;border-radius:10px;cursor:pointer;font-weight:600}
.hint{font-size:14px;color:var(--white);margin:-6px 0 16px;line-height:1.55}
.hint code{background:var(--light);padding:1px 5px;border-radius:4px}
.msg-box{margin-top:12px;text-align:center;font-size:14px}
.msg-box.ok{color:#1a9e6b}.msg-box.err{color:#c0392b}

/* quản lý chủ đề */
.add-nhom-row{display:flex;gap:10px;margin-bottom:14px}
.add-nhom-row input{flex:1}
.manage-head{display:flex;justify-content:space-between;align-items:center;margin:22px 0 10px;flex-wrap:wrap;gap:10px}
.manage-head h3{margin:0}
.nhom-manage{display:flex;flex-direction:column;gap:8px}
.nhom-row{display:flex;gap:10px;align-items:center;background:var(--light);padding:10px 12px;border-radius:12px;border:2px solid transparent}
.nhom-row.dirty{border-color:var(--accent2);background:#fffbea}
.nhom-row.off{opacity:.55}
.nhom-row input[type=text]{flex:1}
.nhom-row label.toggle{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--gray);cursor:pointer;flex-shrink:0}

/* setup */
.setup-toolbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin:0 0 18px;padding:12px 14px;background:linear-gradient(135deg,rgba(102,126,234,.09),rgba(118,75,162,.09));border:1px solid rgba(118,75,162,.16);border-radius:14px}
.setup-toolbar-left{display:flex;gap:10px;flex-wrap:wrap}
.su-tool-btn{border:none;cursor:pointer;font-size:14px;font-weight:700;padding:9px 16px;border-radius:10px;transition:transform .15s,box-shadow .15s,background .15s;display:inline-flex;align-items:center;gap:6px}
.su-tool-btn:active{transform:scale(.94)}
.su-tool-all{background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;box-shadow:0 4px 12px rgba(102,126,234,.35)}
.su-tool-all:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(102,126,234,.45)}
.su-tool-none{background:#fff;color:var(--purple);border:2px solid #e3e0f0}
.su-tool-none:hover{transform:translateY(-2px);background:#f3f0fb}
.setup-count{font-size:14px;color:var(--dark);font-weight:600}
.setup-count b{color:var(--purple);font-size:17px;margin:0 1px}
.setup-empty{text-align:center;color:var(--gray);padding:30px 12px;font-size:15px;background:var(--light);border-radius:14px}

.su-filter{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.su-filter input{flex:1;min-width:170px}
.setup-startbar{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin:0 0 14px;padding:13px 18px;background:linear-gradient(135deg,var(--blue),var(--purple));border-radius:14px;box-shadow:0 8px 20px rgba(102,126,234,.32)}
.setup-startbar .setup-total{margin:0;color:#fff;font-size:16px}
.setup-startbar .setup-total b{color:#fff;-webkit-text-fill-color:#fff;background:none;font-size:24px}
.su-start-btn{background:#fff;color:var(--purple);font-weight:800;font-size:16px;padding:12px 28px;border-radius:12px;border:none;cursor:pointer;box-shadow:0 4px 10px rgba(0,0,0,.18);transition:transform .15s,box-shadow .15s}
.su-start-btn:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(0,0,0,.26)}
.su-start-btn:active{transform:scale(.96)}

.setup-list{display:flex;flex-direction:column;gap:12px;margin-bottom:18px}
.setup-row{--c:#667eea;--cl:#eef0ff;display:flex;align-items:center;gap:14px;background:#fff;padding:14px 16px 14px 18px;border-radius:16px;border:2px solid #ececf3;position:relative;overflow:hidden;opacity:0;animation:suIn .45s ease both;transition:transform .18s,box-shadow .2s,border-color .2s,background .2s}
.setup-row::before{content:'';position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--c);opacity:.5;transition:width .2s,opacity .2s}
.setup-row:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(60,50,120,.13);border-color:#dcd8ec}
.setup-row.checked{background:linear-gradient(135deg,#fff,var(--cl));border-color:var(--c);box-shadow:0 9px 20px -6px var(--c)}
.setup-row.checked::before{width:7px;opacity:1}
@keyframes suIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}

.su-main{display:flex;align-items:center;gap:14px;flex:1;min-width:0;cursor:pointer;-webkit-tap-highlight-color:transparent}
.su-hidden-ck{position:absolute;opacity:0;width:0;height:0;pointer-events:none}
.su-check{width:28px;height:28px;border-radius:9px;border:2.5px solid #cdd0e0;background:#fff;flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:.2s}
.su-check svg{width:16px;height:16px;stroke:#fff;stroke-width:3.5;fill:none;stroke-linecap:round;stroke-linejoin:round;opacity:0;transform:scale(.4);transition:.2s}
.setup-row.checked .su-check{background:var(--c);border-color:var(--c);transform:rotate(-4deg) scale(1.06)}
.setup-row.checked .su-check svg{opacity:1;transform:scale(1)}
.su-info{min-width:0}
.setup-row .name{font-size:17px;font-weight:700;color:var(--dark);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.setup-row .badge{display:inline-block;margin-top:3px;font-size:12px;color:#fff;font-weight:700;background:var(--c);opacity:.88;padding:2px 10px;border-radius:20px}

.su-stepper{display:flex;align-items:center;gap:5px;flex-shrink:0;background:var(--light);padding:4px;border-radius:12px;transition:opacity .2s}
.setup-row:not(.checked) .su-stepper{opacity:.45}
.su-step{width:30px;height:30px;border:none;border-radius:9px;background:#fff;color:var(--purple);font-size:20px;font-weight:800;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 1px 3px rgba(0,0,0,.12);transition:transform .12s,background .15s,color .15s}
.su-step:hover{background:var(--purple);color:#fff}
.su-step:active{transform:scale(.86)}
.setup-row input[type=number]{width:50px;text-align:center;font-size:16px;font-weight:800;padding:6px 2px;border:none;background:transparent;color:var(--dark);-moz-appearance:textfield}
.setup-row input[type=number]::-webkit-outer-spin-button,.setup-row input[type=number]::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.setup-row input[type=number]:disabled{color:#b5b5c5}

.setup-total{text-align:right;margin:4px 2px 16px;font-size:16px;color:var(--dark)}
.setup-total b{font-size:24px;background:linear-gradient(135deg,var(--blue),var(--purple));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:var(--purple)}

/* kết quả */
.results-tools{display:flex;gap:8px;margin-bottom:14px}
.rs-toggle{flex:1;padding:10px;border:2px solid #e0e0e0;background:#fff;border-radius:10px;cursor:pointer;font-weight:600}
.rs-toggle.active{background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;border-color:transparent}
.rs-student-row{display:flex;align-items:center;gap:10px;margin-bottom:14px;background:var(--light);padding:10px 14px;border-radius:12px;flex-wrap:wrap}
.rs-student-row select{flex:1;min-width:180px}
.rs-action-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;background:var(--light);padding:10px 14px;border-radius:12px;margin-bottom:14px}
.result-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:16px}
.summary-box{background:var(--light);border-radius:12px;padding:14px;text-align:center}
.summary-box .s-num{font-size:26px;font-weight:800;color:var(--purple)}
.summary-box .s-label{font-size:12px;color:var(--gray)}
.result-list{display:flex;flex-direction:column;gap:10px}
.result-card{background:var(--light);border-radius:12px;padding:14px;border-left:4px solid var(--blue)}
.result-card.checked{border-left-color:var(--accent);background:#fff5f5}
.result-card-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;gap:10px}
.result-game{font-weight:700;display:flex;align-items:center;gap:10px}
.result-score-big{font-weight:800}
.score-pos{color:#1a9e6b}.score-neg{color:#c0392b}
.result-meta{display:flex;flex-wrap:wrap;gap:12px;font-size:13px;color:var(--gray)}
.result-wrong{margin-top:8px;font-size:13px;color:#c0392b}
.result-del{background:rgba(230,57,70,.12);color:#c1121f;border:none;width:32px;height:32px;border-radius:9px;cursor:pointer}
.result-del:hover{background:#e63946;color:#fff}
.result-check,.hd-check{width:20px;height:20px;cursor:pointer;accent-color:var(--accent)}

/* xếp hạng */
.me-rank-card{background:linear-gradient(135deg,#1a1a2e,#16213e);border-radius:24px;padding:24px;margin-bottom:18px;color:#fff;position:relative;overflow:hidden;box-shadow:0 12px 40px rgba(0,0,0,.3)}
.me-rank-head{display:flex;align-items:center;gap:16px}
.me-rank-icon{font-size:72px;animation:float 3s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
.me-rank-label{font-size:13px;opacity:.7;text-transform:uppercase;letter-spacing:2px}
.me-rank-tier{font-size:32px;font-weight:800;background:linear-gradient(135deg,var(--rk-c1,#ffbe0b),var(--rk-c2,#fb5607));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.me-rank-pos{font-size:14px;opacity:.85;margin-top:4px}
.me-rank-pos b{color:var(--rk-c1,#ffbe0b)}
.me-rank-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:20px}
.me-rank-stat{background:rgba(255,255,255,.08);padding:10px 8px;border-radius:12px;text-align:center}
.me-rank-stat .v{font-size:22px;font-weight:800}
.me-rank-stat .l{font-size:11px;opacity:.7}
.rank-progress-wrap{margin-top:18px}
.rank-progress-label{display:flex;justify-content:space-between;font-size:12px;opacity:.85;margin-bottom:6px}
.rank-progress-bar{height:12px;background:rgba(255,255,255,.15);border-radius:10px;overflow:hidden}
.rank-progress-fill{height:100%;background:linear-gradient(90deg,var(--rk-c1,#ffbe0b),var(--rk-c2,#fb5607));border-radius:10px}
.rank-next-hint{font-size:13px;opacity:.85;margin-top:8px;text-align:center}
.rk-tiers-panel{background:rgba(255,255,255,.96);border-radius:18px;padding:18px;margin-bottom:18px;box-shadow:var(--shadow)}
.rk-tiers-panel h3{margin:0 0 10px}
.rk-tiers{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.rk-tier-chip{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;background:var(--light)}
.rk-tier-chip.current{background:linear-gradient(135deg,var(--rk-c1),var(--rk-c2));color:#fff;transform:scale(1.05)}
.rk-tier-chip .ti{font-size:26px}
.rk-tier-chip .tn{font-size:13px;font-weight:700}
.rk-tier-chip .tm{font-size:11px;opacity:.7}
.rk-weights{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px}
.rk-weight-chip{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 12px;border-radius:10px;background:var(--light);font-size:13px}
.rk-weight-chip .wv{font-weight:800;color:#fff;padding:2px 8px;border-radius:8px;font-size:12px}
.w-easy{background:#1dd1a1}.w-mid{background:#f7971e}.w-hard{background:#ee0979}
.rk-list{display:flex;flex-direction:column;gap:8px}
.rk-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:14px;background:var(--light);border:2px solid transparent}
.rk-row.me{background:#fff5d6;border-color:var(--accent2)}
.rk-pos{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;background:#fff;color:var(--gray);flex-shrink:0}
.rk-row.top1 .rk-pos{background:linear-gradient(135deg,#ffd700,#ffaa00);color:#fff}
.rk-row.top2 .rk-pos{background:linear-gradient(135deg,#c0c0c0,#999);color:#fff}
.rk-row.top3 .rk-pos{background:linear-gradient(135deg,#cd7f32,#a05a2c);color:#fff}
.rk-tier-ico{font-size:32px}
.rk-name{flex:1}.rk-name .nm{font-weight:700}.rk-name .tr{font-size:12px;color:var(--gray)}
.rk-pts{font-weight:800;color:var(--purple);text-align:right}
.rk-pts span{font-size:11px;color:var(--gray);display:block}

/* thống kê */
.tk-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.tk-card{background:var(--light);border-radius:14px;padding:18px;text-align:center}
.tk-card .v{font-size:30px;font-weight:800;color:var(--purple)}
.tk-card .l{font-size:13px;color:var(--gray)}
.tk-bar-row{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.tk-bar-name{width:160px;font-size:14px;flex-shrink:0}
.tk-bar-track{flex:1;background:var(--light);border-radius:8px;height:24px;overflow:hidden}
.tk-bar-fill{height:100%;background:linear-gradient(90deg,var(--blue),var(--purple));border-radius:8px;display:flex;align-items:center;padding-left:8px;color:#fff;font-size:12px;font-weight:700}
.tk-word-row{display:flex;justify-content:space-between;padding:8px 12px;background:var(--light);border-radius:10px;margin-bottom:6px}
.tk-word-row .sai{color:#c0392b;font-weight:700}

/* hướng dẫn */
.hd-add-box{background:var(--light);border-radius:14px;padding:18px}
.hd-card{background:#fff;border-radius:14px;padding:16px 18px;box-shadow:0 3px 12px rgba(0,0,0,.08);border-left:5px solid var(--purple);margin-bottom:12px}
.hd-card.checked{border-left-color:var(--accent);background:#fff5f5}
.hd-card-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.hd-title{flex:1;font-size:17px;font-weight:700}
.hd-content{white-space:pre-wrap;word-wrap:break-word;font-size:14px;line-height:1.6}

/* tài khoản */
.acc-add{display:flex;gap:8px;flex-wrap:wrap}
.acc-add input,.acc-add select{flex:1;min-width:120px}
.acc-table{width:100%;border-collapse:collapse;margin-top:8px}
.acc-table th,.acc-table td{padding:10px;border-bottom:1px solid #eee;text-align:left;font-size:14px}
.acc-table th{color:var(--gray);font-size:12px}
.badge-role{padding:2px 8px;border-radius:8px;font-size:12px;font-weight:700}
.badge-gv{background:#dbeafe;color:#1e40af}.badge-hs{background:#dcfce7;color:#166534}.badge-qt{background:#fef3c7;color:#92400e}

/* trang chơi chung */
.game-wrap{max-width:680px;margin:0 auto;color:#fff}
.game-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.progress-badge,.score-badge{background:rgba(255,255,255,.2);padding:6px 14px;border-radius:20px;font-size:14px}
.game-question{text-align:center;margin-bottom:22px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);border-radius:18px;padding:18px 16px}
.q-label{font-size:12px;opacity:.9;text-transform:uppercase;letter-spacing:1.5px;font-weight:700}
.q-word{font-size:36px;font-weight:800;text-shadow:0 2px 10px rgba(0,0,0,.3)}
.q-type{font-style:italic;opacity:.85}
.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:13px}
.quiz-opt{background:linear-gradient(135deg,#fff,#f1eefb);color:#2a2550;border:2px solid #e3def5;border-radius:14px;padding:15px 16px;font-size:16px;cursor:pointer;text-align:left;font-weight:700;display:flex;align-items:center;gap:12px;justify-content:flex-start;box-shadow:0 4px 12px rgba(40,30,90,.16);transition:transform .15s,box-shadow .18s,border-color .18s,background .18s}
.quiz-opt:hover{transform:translateY(-3px);border-color:var(--purple);box-shadow:0 9px 20px rgba(80,50,160,.28)}
.quiz-opt:active{transform:translateY(-1px) scale(.99)}
.quiz-opt.correct{background:linear-gradient(135deg,#1dd1a1,#10ac84);color:#fff;border-color:#10ac84;box-shadow:0 8px 20px rgba(16,172,132,.45)}
.quiz-opt.wrong{background:linear-gradient(135deg,#ff6b6b,#ee5253);color:#fff;border-color:#ee5253;box-shadow:0 8px 20px rgba(238,82,83,.45)}
.opt-key{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;flex-shrink:0;box-shadow:0 2px 6px rgba(102,126,234,.4)}
.opt-text{flex:1;line-height:1.35}
.quiz-opt.correct .opt-key,.quiz-opt.wrong .opt-key{background:rgba(255,255,255,.3);box-shadow:none}
.speak-btn{background:rgba(255,255,255,.28);border:none;border-radius:50%;width:48px;height:48px;font-size:22px;cursor:pointer;color:#fff;transition:transform .15s,background .15s}
.speak-btn:hover{background:rgba(255,255,255,.45);transform:scale(1.08)}
.fill-input{width:100%;max-width:420px;padding:16px;font-size:22px;text-align:center;border:3px solid #fff;border-radius:16px;outline:none;font-weight:700}
.shake{animation:shake .35s}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-8px)}75%{transform:translateX(8px)}}
@keyframes pop{0%{transform:scale(0)}60%{transform:scale(1.2)}100%{transform:scale(1)}}
.modal-bg{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:100}
.modal{background:#fff;border-radius:20px;padding:30px;text-align:center;max-width:380px;color:var(--dark)}
.modal h2{margin:0 0 10px}
.modal .big-score{font-size:48px;font-weight:800;color:var(--purple)}
.modal-btns{display:flex;gap:10px;margin-top:18px}
.modal-btns button{flex:1;padding:12px;border:none;border-radius:10px;cursor:pointer;font-weight:600}
@media(max-width:600px){.quiz-options{grid-template-columns:1fr}.me-rank-stats{grid-template-columns:repeat(2,1fr)}}

/* ---------- Quản lí từ vựng ---------- */
.selected-info{font-size:14px;color:var(--dark)}
.wd-filter{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.wd-filter select{flex:0 1 240px}
.wd-filter input[type=text]{flex:1 1 200px}
.wd-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;background:var(--light);padding:10px 12px;border-radius:12px;margin-bottom:8px;border:2px solid transparent;transition:background .15s,border-color .15s}
.wd-row:hover{background:#eef0ff}
.wd-row.saved{border-color:var(--green);background:#e7fff5}
.wd-row .wd-ck{width:20px;height:20px;accent-color:var(--blue);flex:0 0 auto;cursor:pointer}
.wd-row input[type=text],.wd-row select{padding:9px 11px;font-size:15px;border:2px solid #e3e3ec;border-radius:9px;background:#fff;font-family:inherit}
.wd-c-tu{flex:1 1 130px;font-weight:600}
.wd-c-lt{flex:0 1 80px}
.wd-c-ng{flex:2 1 200px}
.wd-c-cd{flex:1 1 150px}
.wd-row .btn-mini{flex:0 0 auto;margin-left:auto;border:none;background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;border-radius:9px;padding:9px 12px;cursor:pointer;font-size:15px}
.wd-row .btn-mini:hover{opacity:.9}
.wd-empty{text-align:center;color:var(--gray);padding:28px 10px;font-size:15px}

/* ---------- Nhập tài khoản hàng loạt từ Excel/CSV ---------- */
.acc-import{margin-top:16px;padding:14px 16px;background:#f7f8ff;border:1px dashed #c9c6e6;border-radius:12px}
.acc-import h4{margin:0 0 6px}
.acc-import input[type=file]{margin-top:6px}
#ac_preview{margin-top:10px;overflow-x:auto}
#ac_preview table{width:100%;border-collapse:collapse;font-size:13px}
#ac_preview th,#ac_preview td{border:1px solid #e0e0ee;padding:5px 8px;text-align:left}

/* ============ TRANG QUẢN TRỊ ============ */
.qt-tabs{display:flex;gap:10px;max-width:880px;margin:0 auto 16px;flex-wrap:wrap}
.qt-tab{flex:1;min-width:150px;padding:13px 18px;border:none;border-radius:14px;cursor:pointer;font-size:16px;font-weight:700;
        background:rgba(255,255,255,.22);color:#fff;transition:.2s;backdrop-filter:blur(4px)}
.qt-tab:hover{background:rgba(255,255,255,.34)}
.qt-tab.active{background:#fff;color:var(--purple);box-shadow:0 8px 20px rgba(0,0,0,.18)}
.qt-search{max-width:320px;padding:9px 12px;border:2px solid #e0e0e0;border-radius:10px;font-size:14px}
.qt-actions{white-space:nowrap;text-align:right}
.qt-btn-edit,.qt-btn-del{border:none;border-radius:8px;padding:6px 11px;font-size:13px;cursor:pointer;font-weight:600;margin-left:6px}
.qt-btn-edit{background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff}
.qt-btn-del{background:#fde8e8;color:#c0392b}
.qt-btn-edit:hover{opacity:.9}.qt-btn-del:hover{background:#f9caca}
.qt-link{margin-left:10px;font-size:14px;color:var(--purple);font-weight:600;text-decoration:none}
.qt-link:hover{text-decoration:underline}
/* modal dạng form (sửa tài khoản / lớp) */
.qt-modal{max-width:440px;text-align:left;width:92%}
.qt-modal h2{text-align:center}
.qt-modal .field{margin-bottom:12px}
.qt-modal .field input[disabled]{background:#f1f1f5;color:#777}
.btn-ghost-modal{flex:1;padding:12px;border:2px solid #e0e0e0;border-radius:10px;cursor:pointer;font-weight:600;background:#fff;color:var(--gray)}
.btn-ghost-modal:hover{background:#f5f5f5}

/* ============ QUẢN LÝ CHỦ ĐỀ (đẹp hơn) ============ */
.cd-toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:8px}
.cd-toolbar .add-nhom-row{flex:1;margin-bottom:0;min-width:240px}
.cd-count-chip{background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff;font-size:13px;font-weight:700;
               padding:7px 14px;border-radius:999px;white-space:nowrap}
.cd-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media(max-width:560px){.cd-grid{grid-template-columns:1fr}}
.cd-card{display:flex;align-items:center;gap:10px;background:#fff;border:2px solid #eef0f7;border-left:5px solid var(--blue);
         border-radius:14px;padding:12px 14px;box-shadow:0 3px 10px rgba(0,0,0,.05);transition:.18s}
.cd-card:hover{box-shadow:0 8px 20px rgba(0,0,0,.12);transform:translateY(-2px)}
.cd-card.dirty{border-left-color:var(--accent2);background:#fffbea}
.cd-card.off{opacity:.6;border-left-color:#bbb}
.cd-num{width:30px;height:30px;flex-shrink:0;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--purple));
        color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}
.cd-card input[type=text]{flex:1;border:1px solid #e3e3ef;border-radius:8px;padding:8px 10px;font-size:15px;font-weight:600;min-width:0}
.cd-card input[type=text]:focus{border-color:var(--blue);outline:none}
.cd-switch{display:flex;align-items:center;gap:7px;flex-shrink:0;font-size:12px;color:var(--gray);cursor:pointer;user-select:none}
.cd-switch input{display:none}
.cd-switch .track{width:42px;height:23px;border-radius:999px;background:#cfd2e0;position:relative;transition:.2s}
.cd-switch .track::after{content:'';position:absolute;top:2px;left:2px;width:19px;height:19px;border-radius:50%;background:#fff;transition:.2s;box-shadow:0 1px 3px rgba(0,0,0,.3)}
.cd-switch input:checked + .track{background:var(--green)}
.cd-switch input:checked + .track::after{transform:translateX(19px)}
.cd-empty{text-align:center;color:var(--gray);padding:26px;background:var(--light);border-radius:14px}

/* ===== Nút loa nhỏ + bảng "từ đã sai" (kết quả & lịch sử) ===== */
.mini-spk{border:none;background:#eef2ff;color:#4338ca;border-radius:8px;padding:4px 9px;font-size:15px;cursor:pointer;line-height:1}
.mini-spk:hover{background:#e0e7ff}
.wrong-wrap{margin:14px 0;text-align:left}
.wrong-title{font-weight:700;margin-bottom:6px;color:#c0392b}
.wrong-none{margin:14px 0;color:#166534;font-weight:600;text-align:center}
.wrong-table{width:100%;border-collapse:collapse;font-size:14px;background:#fff;border-radius:10px;overflow:hidden}
.wrong-table th,.wrong-table td{border:1px solid #eee;padding:6px 9px;text-align:left}
.wrong-table th{background:#f8f8fc;font-size:12px;color:#666;text-transform:uppercase;letter-spacing:.4px}
.wrong-table .wt-tu{font-weight:700;color:#2d3436}
.wrong-table .wt-loai{color:#888;font-style:italic;white-space:nowrap}
.wrong-table td:last-child,.wrong-table th:last-child{width:46px;text-align:center}
/* modal kết quả: cho phép cuộn khi bảng từ sai dài */
.modal-result{max-height:88vh;overflow-y:auto}
.modal-result .wrong-table{color:#2d3436}
.result-wrong{margin-top:10px}