:root {
    --bg:#f5f2ec; --bg-alt:#eae5db; --sidebar:#1b2038; --sidebar-hover:#252c48;
    --sidebar-active:rgba(74,108,247,.15); --sidebar-accent:#4a6cf7;
    --sidebar-text:#8892b0; --sidebar-text-a:#fff;
    --primary:#4a6cf7; --primary-hover:#3d5ce0; --primary-light:#eef1ff;
    --danger:#ef4444; --danger-hover:#dc2626; --danger-light:#fef2f2;
    --success:#22c55e; --success-light:#f0fdf4; --warning:#f59e0b; --warning-light:#fffbeb;
    --card:#fff; --text:#1a202c; --text-2:#4a5568; --text-3:#a0aec0;
    --border:#e2e8f0; --border-lt:#edf2f7;
    --shadow-sm:0 1px 3px rgba(0,0,0,.05); --shadow:0 2px 8px rgba(0,0,0,.07);
    --shadow-lg:0 12px 32px rgba(0,0,0,.12);
    --radius:16px; --radius-sm:10px; --radius-xs:6px;
    --ease:cubic-bezier(.4,0,.2,1); --tr:.25s var(--ease);
    --font-cn:'Noto Sans SC',system-ui,sans-serif;
    --font-display:'ZCOOL XiaoWei','Noto Sans SC',serif;
    --font-en:'Bricolage Grotesque','Noto Sans SC',sans-serif;
    --font-mono:'DM Mono','Courier New',monospace;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased;scroll-behavior:smooth}
body{font-family:var(--font-cn);background:var(--bg);color:var(--text);min-height:100vh;line-height:1.6}
body::after{content:'';position:fixed;inset:0;pointer-events:none;z-index:9999;
    background:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");opacity:.025}
h1,h2,h3{line-height:1.3}
.page-title{font-size:28px;font-weight:700;font-family:var(--font-display)}
.page-desc{font-size:14px;color:var(--text-2);margin-top:4px}

/* Auth */
.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:20px}
.auth-card{background:var(--card);border-radius:24px;padding:40px 36px;width:100%;max-width:420px;box-shadow:0 20px 60px rgba(0,0,0,.1);animation:fadeUp .4s var(--ease)}
.auth-brand{text-align:center;margin-bottom:32px}
.auth-brand-icon{width:56px;height:56px;border-radius:16px;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;margin-bottom:16px}
.auth-title{font-size:28px;font-family:var(--font-display);margin-bottom:4px}
.auth-subtitle{font-size:14px;color:var(--text-3)}
.auth-tabs{display:flex;background:var(--bg);border-radius:12px;padding:4px;margin-bottom:28px}
.auth-tab{flex:1;padding:10px;text-align:center;border:none;background:transparent;border-radius:10px;font-size:15px;font-weight:600;color:var(--text-3);cursor:pointer;transition:var(--tr);font-family:var(--font-cn)}
.auth-tab.active{background:var(--card);color:var(--text);box-shadow:var(--shadow-sm)}
.auth-form{animation:fadeUp .25s var(--ease)}
.auth-links{text-align:center;margin-top:16px}
.auth-links a{color:var(--primary);font-size:14px;text-decoration:none}.auth-links a:hover{text-decoration:underline}
.auth-footer{text-align:center;margin-top:24px;padding-top:20px;border-top:1px solid var(--border-lt)}
.auth-footer a{color:var(--text-3);font-size:13px;text-decoration:none;transition:var(--tr)}.auth-footer a:hover{color:var(--primary)}
.code-row{display:flex;gap:10px}.code-input{flex:1}.code-btn{white-space:nowrap;flex-shrink:0;min-width:100px}

/* Layout */
.app{display:flex;min-height:100vh}.content{flex:1;margin-left:260px;padding:36px 44px;max-width:1200px}

/* Sidebar */
.sidebar{position:fixed;left:0;top:0;bottom:0;width:260px;background:linear-gradient(180deg,#1b2038,#111729);display:flex;flex-direction:column;z-index:100;box-shadow:4px 0 24px rgba(0,0,0,.15)}
.sidebar-brand{display:flex;align-items:center;gap:14px;padding:28px 24px 20px;border-bottom:1px solid rgba(255,255,255,.06)}
.brand-icon{width:40px;height:40px;border-radius:10px;background:var(--sidebar-accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700}
.brand-title{font-size:18px;font-weight:700;color:#fff;font-family:var(--font-display)}
.brand-sub{font-size:11px;color:var(--sidebar-text);letter-spacing:.08em;text-transform:uppercase;font-family:var(--font-en)}
.sidebar-nav{flex:1;padding:12px 0}
.nav-item{display:flex;align-items:center;gap:14px;padding:13px 24px;color:var(--sidebar-text);cursor:pointer;transition:var(--tr);border-left:3px solid transparent;text-decoration:none;font-size:15px;font-weight:500}
.nav-item:hover{background:var(--sidebar-hover);color:var(--sidebar-text-a)}
.nav-item.active{background:var(--sidebar-active);color:var(--sidebar-text-a);border-left-color:var(--sidebar-accent)}
.nav-icon{width:20px;height:20px;flex-shrink:0}
.sidebar-user{padding:16px 20px;border-top:1px solid rgba(255,255,255,.06);display:flex;align-items:center;gap:12px}
.user-avatar{width:36px;height:36px;border-radius:50%;background:var(--sidebar-accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0}
.user-info{flex:1;min-width:0}
.user-name{font-size:14px;font-weight:600;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-phone{font-size:12px;color:var(--sidebar-text)}
.logout-btn{background:none;border:none;color:var(--sidebar-text);cursor:pointer;padding:6px;border-radius:6px;transition:var(--tr);display:flex;align-items:center;justify-content:center}
.logout-btn:hover{background:var(--sidebar-hover);color:#fff}

/* === 移动端顶部用户栏 === */
.mobile-top-bar{display:none;position:fixed;top:0;left:0;right:0;z-index:110;background:linear-gradient(180deg,#1b2038,#111729);padding:10px 16px;box-shadow:0 2px 16px rgba(0,0,0,.15);align-items:center;justify-content:space-between}
.mobile-user-left{display:flex;align-items:center;gap:10px}
.mobile-top-bar .user-avatar{width:32px;height:32px;border-radius:50%;background:var(--sidebar-accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}
.mobile-top-bar .user-info{min-width:0}
.mobile-top-bar .user-name{font-size:14px;font-weight:600;color:#fff}
.mobile-top-bar .user-phone{font-size:11px;color:var(--sidebar-text)}
.mobile-top-bar .logout-btn{background:none;border:none;color:var(--sidebar-text);cursor:pointer;padding:6px;border-radius:6px;transition:var(--tr);display:flex;align-items:center;justify-content:center}
.mobile-top-bar .logout-btn:hover{background:var(--sidebar-hover);color:#fff}

.content{margin-left:260px;padding:32px 40px;min-height:100vh;background:var(--bg)}
.page{display:none;animation:fadeUp .35s var(--ease)}.page.active{display:block}
.page-header{margin-bottom:28px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:28px}
.setup-card{max-width:520px}.table-card{padding:0;overflow:hidden}

/* Forms */
.form-group{margin-bottom:22px}
.form-group label{display:block;font-size:13px;font-weight:600;color:var(--text-2);margin-bottom:8px;letter-spacing:.02em}
.input{width:100%;padding:11px 16px;border:2px solid var(--border);border-radius:var(--radius-sm);font-size:15px;font-family:var(--font-cn);transition:var(--tr);background:#fff}
.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(74,108,247,.1)}
.input.input-sm{padding:8px 14px;font-size:14px}
select.input{cursor:pointer;appearance:auto}
.radio-group{display:flex;gap:0}
.radio-option{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;cursor:pointer;
    font-size:15px;font-weight:500;background:var(--bg);color:var(--text-2);
    border:2px solid var(--border);transition:var(--tr);user-select:none;margin-left:-2px}
.radio-option:first-child{margin-left:0;border-radius:var(--radius-sm) 0 0 var(--radius-sm)}
.radio-option:last-child{border-radius:0 var(--radius-sm) var(--radius-sm) 0}
.radio-option input{display:none}
.radio-option:has(input:checked){background:var(--primary);color:#fff;border-color:var(--primary);z-index:1}
.radio-option:hover:not(:has(input:checked)){background:var(--border-lt);color:var(--text)}
.count-row{display:flex;gap:12px;align-items:center}.count-input{width:100px}.count-presets{display:flex;gap:6px}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 22px;border-radius:var(--radius-sm);font-weight:600;font-size:14px;cursor:pointer;border:none;transition:var(--tr);font-family:var(--font-cn);white-space:nowrap;text-decoration:none}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 4px 14px rgba(74,108,247,.3)}
.btn-secondary{background:var(--bg-alt);color:var(--text-2)}.btn-secondary:hover{background:var(--border)}
.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{background:var(--danger-hover);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--text-2)}.btn-ghost:hover{background:var(--border-lt)}
.btn-lg{padding:14px 32px;font-size:16px;border-radius:var(--radius)}
.btn-sm{padding:6px 14px;font-size:13px;border-radius:var(--radius-xs)}
.btn-full{width:100%}.btn-icon{width:18px;height:18px}
.btn-success{background:#d4edda;color:#155724;border:1px solid #c3e6cb}
.btn-success:hover{background:#c3e6cb;transform:translateY(-1px);box-shadow:0 4px 14px rgba(21,87,36,.15)}
.btn-danger-text{color:var(--danger)!important}.btn-danger-text:hover{background:var(--danger-light)!important}
.btn:disabled{opacity:.6;cursor:not-allowed;transform:none!important;box-shadow:none!important}

/* Toolbar & Stats */
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.toolbar-left,.toolbar-right{display:flex;gap:10px;align-items:center}
.toolbar-right .input-sm{width:150px}
.stats-bar{display:flex;gap:16px;margin-bottom:24px}
.stat-mini{background:var(--card);border-radius:var(--radius-sm);padding:16px 24px;flex:1;text-align:center;box-shadow:var(--shadow-sm)}
.stat-mini-val{display:block;font-size:28px;font-weight:800;font-family:var(--font-en);color:var(--primary)}
.stat-mini-lbl{font-size:12px;color:var(--text-3);margin-top:2px}

/* Dictation */
.dict-phase{animation:fadeUp .3s var(--ease)}
.timer-bar{position:sticky;top:0;z-index:10;background:var(--card);padding:16px 28px;border-radius:var(--radius);box-shadow:var(--shadow);display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}
.timer{font-family:var(--font-mono);font-size:40px;font-weight:500;color:var(--primary);letter-spacing:3px}
.timer-controls{display:flex;gap:12px}
.words-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(128px,1fr));gap:12px}
.dict-word-card{background:var(--card);border-radius:var(--radius-sm);padding:18px 14px;text-align:center;position:relative;box-shadow:var(--shadow-sm);animation:fadeUp .4s var(--ease) backwards;transition:var(--tr)}
.dict-word-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.word-number{position:absolute;top:6px;left:10px;font-size:11px;color:var(--text-3);font-family:var(--font-mono)}
.word-chinese{font-size:17px;font-weight:500;display:block}
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-bottom:28px}
.review-card{background:var(--card);border-radius:var(--radius-sm);padding:20px 16px;text-align:center;cursor:pointer;border:2.5px solid transparent;transition:var(--tr);box-shadow:var(--shadow-sm);position:relative;animation:fadeUp .3s var(--ease) backwards;user-select:none}
.review-card:hover{border-color:var(--border);transform:translateY(-2px)}
.review-card.wrong{border-color:var(--danger);background:var(--danger-light)}
.review-card.wrong .wrong-badge{display:flex}
.wrong-badge{display:none;position:absolute;top:8px;right:10px;width:24px;height:24px;border-radius:50%;background:var(--danger);color:#fff;align-items:center;justify-content:center;font-size:14px;font-weight:700}
.review-chinese{font-size:19px;font-weight:500;margin-bottom:4px}
.review-phonetic{font-family:var(--font-mono);font-size:13px;color:var(--text-3);margin-bottom:4px}
.review-english{font-family:var(--font-mono);font-size:14px;color:var(--text-2)}
.review-footer{text-align:center;padding-top:8px}

/* Result */
.result-card{max-width:640px;margin:0 auto;text-align:center}
.result-title{font-size:30px;margin-bottom:28px;font-family:var(--font-display)}
.result-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:32px}
.stat{padding:18px 12px;background:var(--bg);border-radius:var(--radius-sm)}
.stat-val{font-size:32px;font-weight:800;font-family:var(--font-en);color:var(--primary)}
.stat-val.ok{color:var(--success)}.stat-val.err{color:var(--danger)}
.stat-lbl{font-size:12px;color:var(--text-3);margin-top:4px}
.result-section{text-align:left;margin-bottom:28px}
.result-section-title{font-size:15px;font-weight:600;color:var(--text-2);margin-bottom:12px}
.wrong-words-list{display:flex;flex-direction:column;gap:8px;max-height:260px;overflow-y:auto;padding-right:8px}
.wrong-word-item{display:flex;align-items:center;gap:10px;padding:10px 16px;background:var(--danger-light);border-radius:var(--radius-xs);font-size:15px;flex-wrap:wrap}
.ww-chinese{font-weight:500}.ww-phonetic{font-family:var(--font-mono);font-size:13px;color:var(--text-3)}
.ww-divider{color:var(--text-3)}.ww-english{font-family:var(--font-mono);color:var(--danger)}
.result-perfect{padding:32px;margin-bottom:24px}
.perfect-icon{font-size:48px;color:var(--warning);margin-bottom:12px}
.result-perfect p{font-size:18px;font-weight:500;color:var(--success)}
.result-actions{display:flex;gap:14px;justify-content:center;margin-top:8px}

/* Tables */
.table-wrapper{overflow-x:auto}
.data-table{width:100%;border-collapse:collapse}
.data-table th{padding:12px 16px;text-align:left;font-size:12px;font-weight:700;color:var(--text-3);text-transform:uppercase;letter-spacing:.06em;border-bottom:2px solid var(--border);background:var(--bg);position:sticky;top:0}
.data-table td{padding:13px 16px;border-bottom:1px solid var(--border-lt);font-size:14px;vertical-align:middle}
.data-table tr:hover td{background:rgba(74,108,247,.02)}
.english-cell{font-family:var(--font-mono);font-size:13px}
.phonetic-cell{font-family:var(--font-mono);font-size:13px;color:var(--text-3)}
.tag{display:inline-block;padding:3px 10px;background:var(--primary-light);color:var(--primary);border-radius:20px;font-size:12px;font-weight:500}
.text-center{text-align:center}.text-muted{color:var(--text-3)}
.text-success{color:var(--success)}.text-danger{color:var(--danger)}
.empty-state{text-align:center;color:var(--text-3);padding:40px 16px;font-size:15px}
.actions-cell{white-space:nowrap}
.error-count-badge{display:inline-block;min-width:28px;padding:2px 8px;background:var(--danger-light);color:var(--danger);border-radius:20px;font-weight:700;font-size:14px;text-align:center}
.correct-streak{font-family:var(--font-mono);font-weight:500;color:var(--primary)}
.clickable-row{cursor:pointer}.clickable-row:hover td{background:var(--primary-light)!important}
.pagination{display:flex;gap:6px;padding:16px 20px;justify-content:center;flex-wrap:wrap}

/* Modal Content */
.modal-title{font-size:22px;font-weight:700;font-family:var(--font-display);margin-bottom:8px}
.modal-desc{font-size:14px;color:var(--text-2);margin-bottom:20px}
.modal-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:24px}
.preview-wrapper{max-height:260px;overflow-y:auto;margin-bottom:20px;border:1px solid var(--border-lt);border-radius:var(--radius-xs)}
.preview-table{width:100%;border-collapse:collapse;font-size:14px}
.preview-table th{padding:8px 14px;background:var(--bg);text-align:left;font-size:12px;color:var(--text-3);border-bottom:1px solid var(--border)}
.preview-table td{padding:8px 14px;border-bottom:1px solid var(--border-lt)}
.parse-errors{background:var(--warning-light);padding:12px 16px;border-radius:var(--radius-xs);margin-bottom:16px;font-size:13px}
.parse-errors p{margin-bottom:4px}
.detail-meta{display:flex;flex-wrap:wrap;gap:16px;font-size:13px;color:var(--text-2);margin-bottom:20px}
.detail-words{display:flex;flex-direction:column;gap:6px;max-height:340px;overflow-y:auto;margin-bottom:16px}
.detail-word{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:var(--radius-xs);font-size:14px}
.detail-word.correct{background:var(--success-light)}.detail-word.wrong{background:var(--danger-light)}
.dw-status{width:24px;font-size:16px;font-weight:700;text-align:center;flex-shrink:0}
.dw-chinese{font-weight:500}
.dw-phonetic{font-family:var(--font-mono);font-size:12px;color:var(--text-3);margin-left:4px}
.dw-english{font-family:var(--font-mono);font-size:13px;color:var(--text-2);margin-left:auto}
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);backdrop-filter:blur(4px);z-index:1000;display:none;align-items:center;justify-content:center}
.modal-overlay.active{display:flex}
.modal{background:var(--card);border-radius:var(--radius);padding:32px;max-width:600px;width:92%;max-height:85vh;overflow-y:auto;box-shadow:var(--shadow-lg);animation:modalIn .3s var(--ease);position:relative}
.modal-close{position:absolute;top:14px;right:18px;background:none;border:none;font-size:26px;cursor:pointer;color:var(--text-3);width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:var(--tr);line-height:1}
.modal-close:hover{background:var(--bg);color:var(--text)}
#toast-container{position:fixed;bottom:24px;right:24px;z-index:2000;display:flex;flex-direction:column;gap:8px;pointer-events:none}
.toast{padding:14px 22px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;box-shadow:var(--shadow-lg);animation:toastIn .3s var(--ease);min-width:220px;pointer-events:auto;transition:opacity .3s,transform .3s}
.toast.success{background:var(--success);color:#fff}
.toast.error{background:var(--danger);color:#fff}
.toast.warning{background:var(--warning);color:#fff}
.toast.info{background:var(--primary);color:#fff}

/* Admin */
.admin-header{background:linear-gradient(135deg,#1b2038,#111729);padding:0 36px;height:64px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100;box-shadow:0 2px 16px rgba(0,0,0,.15)}
.admin-header-left{display:flex;align-items:center;gap:14px}
.admin-brand-icon{width:32px;height:32px;border-radius:8px;background:var(--sidebar-accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700}
.admin-brand-title{font-size:17px;font-weight:600;color:#fff;font-family:var(--font-display)}
.admin-header-right{display:flex;align-items:center;gap:16px}
.admin-username{color:var(--sidebar-text);font-size:14px}
.admin-logout-btn{color:var(--sidebar-text)!important}.admin-logout-btn:hover{color:#fff!important}
.admin-content{padding:32px 36px;max-width:1280px;margin:0 auto}
.admin-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:28px}
.admin-stat-card{background:var(--card);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow-sm);transition:var(--tr)}
.admin-stat-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.admin-stat-val{font-size:36px;font-weight:800;font-family:var(--font-en);color:var(--primary);line-height:1.2;margin-bottom:6px}
.admin-stat-lbl{font-size:13px;color:var(--text-3);font-weight:500}
.admin-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow-sm);overflow:hidden}
.admin-card-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--border-lt)}
.admin-card-title{font-size:17px;font-weight:700;font-family:var(--font-display)}
.admin-toolbar .input-sm{width:240px}
.admin-table td{font-size:13px;padding:11px 14px}.admin-table th{font-size:11px;padding:11px 14px}
.accuracy-bar{display:flex;align-items:center;gap:8px}
.accuracy-track{flex:1;height:6px;background:var(--border-lt);border-radius:3px;overflow:hidden;min-width:50px}
.accuracy-fill{height:100%;border-radius:3px;transition:width .5s var(--ease)}
.accuracy-val{font-size:13px;font-weight:600;font-family:var(--font-mono);min-width:44px;text-align:right}
.detail-section{margin-bottom:20px}
.detail-section-title{font-size:14px;font-weight:600;color:var(--text-2);margin-bottom:10px;padding-bottom:6px;border-bottom:1px solid var(--border-lt)}
.detail-book-block{margin-bottom:14px}
.detail-book-name{font-weight:700;font-size:14px;color:var(--text);margin-bottom:4px;padding:6px 0}
.detail-unit-item{display:flex;align-items:center;gap:12px;padding:7px 12px 7px 24px;border-radius:var(--radius-xs);background:var(--bg);font-size:13px;margin-bottom:3px}
.du-name{flex:1;font-weight:500}.du-stat{font-family:var(--font-mono);font-size:12px;color:var(--text-2)}
.detail-session-item{display:flex;align-items:center;gap:12px;padding:8px 12px;border-radius:var(--radius-xs);background:var(--bg);font-size:13px;margin-bottom:4px}
.ds-date{font-family:var(--font-mono);color:var(--text-3);font-size:12px;min-width:130px}
.ds-info{flex:1}.ds-accuracy{font-weight:600;font-family:var(--font-mono)}.ds-time{font-family:var(--font-mono);color:var(--text-3);font-size:12px}

@keyframes fadeUp{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}
@keyframes modalIn{from{opacity:0;transform:scale(.96) translateY(8px)}to{opacity:1;transform:scale(1) translateY(0)}}
@keyframes toastIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}

@media(max-width:900px){
    .stats-bar{flex-direction:column}.result-stats{grid-template-columns:repeat(2,1fr)}
    .review-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.admin-stats{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
    html,body{overflow:hidden;height:100%}
    .app{height:100%;overflow:hidden}
    .mobile-top-bar{display:flex}
    .sidebar{position:fixed;top:auto;bottom:0;left:0;right:0;width:100%;height:auto;flex-direction:column;box-shadow:0 -2px 16px rgba(0,0,0,.12);background:#1b2038}
    .sidebar-brand{display:none}
    .sidebar-nav{display:flex;flex-direction:row;width:100%;justify-content:space-around;align-items:center;padding:4px 0;order:0}
    .nav-item{flex-direction:column;gap:3px;padding:8px 6px;border-left:none;border-top:2px solid transparent;font-size:11px}
    .nav-item.active{border-top-color:var(--sidebar-accent);border-left-color:transparent;background:transparent}
    .nav-icon{width:20px;height:20px}
    .sidebar-user{display:none}
    .content{margin-left:0;margin-top:52px;padding:16px;min-height:0;height:calc(100vh - 52px - 64px);overflow-y:auto;-webkit-overflow-scrolling:touch}
    .page-title{font-size:22px}
    .toolbar{flex-direction:column;align-items:stretch}
    .toolbar-right{flex-wrap:wrap}.toolbar-right .input-sm{width:100%}
    .words-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:8px}
    .dict-word-card{padding:14px 8px}.word-chinese{font-size:15px}
    .timer{font-size:28px}.timer-bar{padding:12px 16px}
    .modal{width:96%;padding:24px 20px}
    .btn-lg{padding:12px 24px;font-size:15px}
    .result-stats{grid-template-columns:repeat(2,1fr)}.stat-val{font-size:26px}
    .count-row{flex-wrap:wrap}.detail-meta{flex-direction:column;gap:6px}
    .auth-card{padding:28px 24px}
    .admin-header{padding:0 16px;height:56px}.admin-brand-title{font-size:14px}
    .admin-content{padding:20px 16px}.admin-stats{grid-template-columns:repeat(2,1fr)}
    .admin-stat-val{font-size:28px}
    .admin-card-header{flex-direction:column;gap:12px;align-items:stretch}
    .admin-toolbar .input-sm{width:100%}
}