:root{--bg:#f4f7fb;--card:#fff;--text:#13233a;--muted:#6b7280;--line:#dbe3ee;--dark:#08152f;--blue-soft:#dff0ff;--blue-soft-2:#c8e6ff;--warm-soft:#f9ecdf;--warm-line:#f2c998;--shadow:0 14px 40px #10182814;--radius-xl:28px;--radius-lg:20px;--radius-md:16px}*{box-sizing:border-box}body{color:var(--text);background:linear-gradient(#f6f8fc 0%,#eef3fa 100%);margin:0;font-family:Arial,Microsoft YaHei,sans-serif}button,input,select,textarea{font:inherit}button{border:none}#app{min-height:100vh}.page-shell{max-width:1240px;margin:0 auto;padding:40px 24px 120px}.topbar{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:28px;display:flex}.eyebrow{letter-spacing:.22em;color:#94a3b8;margin-bottom:10px;font-size:13px;font-weight:700}.app-title{margin:0;font-size:58px;font-weight:800;line-height:1.1}.main-content{gap:18px;display:grid}.panel{border-radius:var(--radius-xl);box-shadow:var(--shadow);background:#fffffff0;border:1px solid #dbe3eee6;padding:24px}.hero-panel{padding:28px 24px 22px}.hero-header{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:22px;display:flex}.section-title{margin:0 0 8px;font-size:34px;font-weight:800}.section-desc{color:var(--muted);margin:0;font-size:16px;line-height:1.7}.stats-grid{grid-template-columns:repeat(4,1fr);gap:14px;display:grid}.stat-card{border:1px solid var(--line);background:#f8fafc;border-radius:22px;padding:18px 18px 14px}.stat-label{color:#7b8794;margin-bottom:12px;font-size:15px}.stat-value{font-size:54px;font-weight:800;line-height:1}.action-group{gap:14px;display:grid}.primary-action,.secondary-action,.warm-action,.dark-btn,.ghost-btn,.nav-item,.danger-btn,.fake-switch,.selectable-card{cursor:pointer;transition:all .2s}.primary-action:hover,.secondary-action:hover,.warm-action:hover,.dark-btn:hover,.ghost-btn:hover,.nav-item:hover,.danger-btn:hover,.selectable-card:hover{transform:translateY(-1px)}.primary-action{background:var(--dark);color:#fff;border-radius:22px;padding:18px 20px;font-size:28px;font-weight:800}.secondary-action{background:var(--blue-soft-2);color:#1369a8;border:1px solid #b5daff;border-radius:22px;padding:18px 20px;font-size:26px;font-weight:800}.warm-action{background:var(--warm-soft);color:#c96b00;border:1px solid var(--warm-line);border-radius:22px;padding:18px 20px;font-size:26px;font-weight:800}.dark-btn{background:var(--dark);color:#fff;white-space:nowrap;border-radius:20px;padding:16px 24px;font-size:18px;font-weight:700}.ghost-btn{color:#374151;border:1px solid var(--line);background:#fff;border-radius:18px;padding:14px 20px;font-size:16px;font-weight:700}.mini-title{color:#7b8794;margin-bottom:10px;font-size:15px;font-weight:700}.example-box{border:1px solid var(--line);color:#334155;background:#f8fafc;border-radius:20px;margin-top:18px;padding:18px;font-size:16px;line-height:1.8}.feedback-box{color:#047857;background:#ecfdf3;border:1px solid #a7f3d0;border-radius:18px;margin-top:18px;padding:16px 18px;font-weight:700;line-height:1.7}.hidden{display:none}.bottom-nav{border-top:1px solid var(--line);background:#fffffff2;border-radius:24px 24px 0 0;grid-template-columns:repeat(5,1fr);gap:12px;width:min(1240px,100% - 24px);padding:14px 16px 18px;display:grid;position:fixed;bottom:0;left:50%;transform:translate(-50%);box-shadow:0 -10px 30px #0f172a0f}.nav-item{color:#6b7280;background:0 0;border-radius:18px;padding:14px 8px;font-size:18px;font-weight:700}.nav-item.active{color:#1869a9;background:#dff0ff}.page-title-row{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:20px;display:flex}.status-pill{color:#1d4f91;white-space:nowrap;background:#e8f1fb;border-radius:999px;align-items:center;padding:10px 14px;font-size:14px;font-weight:700;display:inline-flex}.study-card{border:1px solid var(--line);background:#f8fafc;border-radius:24px;margin-bottom:18px;padding:24px}.front-card{background:#f8fafc}.back-card{background:#fdfefe}.study-label{color:#7b8794;margin-bottom:12px;font-size:14px;font-weight:700}.study-text{font-size:30px;font-weight:800;line-height:1.6}.study-answer-text{color:var(--text);margin-bottom:18px;font-size:30px;font-weight:800;line-height:1.6}.study-actions{flex-wrap:wrap;gap:12px;display:flex}.small-btn{width:auto;min-width:180px;padding:16px 24px;font-size:18px}.form-group{gap:8px;margin-bottom:18px;display:grid}.form-group label{color:#334155;font-size:15px;font-weight:700}.form-group textarea{border:1px solid var(--line);width:100%;min-height:92px;font:inherit;resize:vertical;background:#f8fafc;border-radius:18px;outline:none;padding:14px 16px}.form-group textarea:focus{background:#fff;border-color:#9ecaf5}.form-group input{border:1px solid var(--line);width:100%;min-height:52px;font:inherit;background:#f8fafc;border-radius:18px;outline:none;padding:14px 16px}.form-group input:focus{background:#fff;border-color:#9ecaf5}.form-message{border-radius:18px;margin-bottom:16px;padding:14px 16px;font-weight:700;line-height:1.7}.form-message.success{color:#047857;background:#ecfdf3;border:1px solid #a7f3d0}.form-message.error{color:#b91c1c;background:#fef2f2;border:1px solid #fecaca}.card-list{gap:14px;display:grid}.list-card{border:1px solid var(--line);background:#f8fafc;border-radius:22px;padding:18px}.list-title{color:var(--text);margin-bottom:8px;font-size:20px;font-weight:800;line-height:1.6}.list-sub{color:#64748b;margin-bottom:12px;line-height:1.7}.list-wrong,.list-note{color:#475569;margin-bottom:10px;line-height:1.7}.list-meta{justify-content:flex-start;display:flex}.setting-row{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:18px;padding:18px 0;display:flex}.setting-row:last-child{border-bottom:none}.setting-title{margin-bottom:6px;font-size:16px;font-weight:800}.setting-desc{color:var(--muted);line-height:1.7}.fake-switch{background:#cbd5e1;border-radius:999px;flex-shrink:0;width:58px;height:32px;position:relative}.fake-switch:after{content:"";background:#fff;border-radius:50%;width:24px;height:24px;position:absolute;top:4px;left:4px;box-shadow:0 2px 8px #0f172a2e}.fake-switch.on{background:#10b981}.fake-switch.on:after{left:30px}.cards-layout{grid-template-columns:1.15fr .95fr;gap:18px;display:grid}.cards-column,.detail-column{align-content:start;gap:14px;display:grid}.selectable-card{text-align:left;background:#f8fafc;width:100%}.selectable-card:hover{border-color:#a8c8ea}.selectable-card.selected{background:#eaf4ff;border-color:#9cc9f5;box-shadow:0 8px 24px #3b82f614}.detail-card{border:1px solid var(--line);background:#f8fafc;border-radius:24px;padding:20px}.detail-block{margin-bottom:18px}.detail-block:last-of-type{margin-bottom:0}.detail-label{color:#64748b;text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px;font-size:13px;font-weight:800}.detail-text{color:var(--text);font-size:28px;font-weight:800;line-height:1.5}.detail-subtext{color:#334155;line-height:1.8}.detail-actions{gap:12px;margin-top:24px;display:grid}.detail-ghost-btn{width:auto}.danger-btn{color:#b91c1c;background:#fef2f2;border:1px solid #fecaca;border-radius:18px;padding:16px 20px;font-size:16px;font-weight:700}.tag-row{flex-wrap:wrap;gap:8px;margin-bottom:12px;display:flex}.tag-chip{color:#1d4ed8;background:#eff6ff;border:1px solid #bfdbfe;border-radius:999px;align-items:center;padding:8px 12px;font-size:13px;font-weight:700;display:inline-flex}.empty-box{border:1px dashed var(--line);color:var(--muted);text-align:center;background:#f8fafc;border-radius:20px;padding:24px;font-weight:700}.study-result-box{border:1px solid var(--line);border-radius:20px;margin-bottom:14px;padding:16px}.result-title{margin:6px 0 10px;font-size:20px;font-weight:800}.success-box{background:#ecfdf3;border-color:#a7f3d0}.error-box{background:#fef2f2;border-color:#fecaca}.neutral-box{border-color:var(--line);background:#f8fafc}.study-info-box{border:1px solid var(--line);background:#f8fafc;border-radius:20px;margin-top:14px;padding:16px}.warning-box{background:#fff7ed;border-color:#fed7aa}.answer-box{background:#eff6ff;border-color:#bfdbfe}.history-list{gap:10px;display:grid}.history-item{border:1px solid var(--line);background:#fff;border-radius:16px;grid-template-columns:auto 1fr;align-items:flex-start;gap:12px;padding:12px;display:grid}.history-index{color:#1d4ed8;background:#eff6ff;border-radius:999px;justify-content:center;align-items:center;min-width:34px;height:34px;font-size:13px;font-weight:800;display:inline-flex}.history-badge{color:#334155;background:#f1f5f9;border-radius:999px;justify-content:center;align-items:center;min-width:52px;height:34px;font-size:13px;font-weight:800;display:inline-flex}.correct-history .history-badge{color:#15803d;background:#dcfce7}.wrong-history .history-badge{color:#b91c1c;background:#fee2e2}.history-text{color:#1e293b;word-break:break-word;line-height:1.7}.history-time{color:#64748b;margin-top:4px;font-size:13px}.empty-inline{color:var(--muted);line-height:1.7}.audio-row{flex-wrap:wrap;align-items:center;gap:14px;margin-bottom:16px;display:flex}.detail-audio-row{margin-bottom:18px}.rate-control{border:1px solid var(--line);background:#f8fafc;border-radius:16px;align-items:center;gap:10px;padding:10px 12px;display:inline-flex}.rate-control label{color:#475569;font-size:14px;font-weight:700}.rate-control select{border:1px solid var(--line);font:inherit;background:#fff;border-radius:12px;outline:none;padding:8px 10px}.settings-rate-control{background:0 0;border:none;padding:0}.settings-rate-control select{min-width:120px}.pronunciation-panel{border:1px solid var(--line);background:#f8fafc;border-radius:20px;margin-bottom:16px;padding:16px}.pronunciation-actions{flex-wrap:wrap;gap:12px;margin-top:10px;display:flex}.listening-tip{color:#1d4ed8;background:#eff6ff;border:1px solid #bfdbfe;border-radius:16px;margin-top:12px;padding:12px 14px;font-weight:700}.score-row{grid-template-columns:auto 1fr;align-items:center;gap:14px;display:grid}.score-badge{color:#0369a1;background:#e0f2fe;border-radius:24px;justify-content:center;align-items:center;width:72px;height:72px;font-size:28px;font-weight:800;display:inline-flex}.score-text-group{gap:6px;display:grid}.score-detail-grid{grid-template-columns:1fr 1fr;gap:12px;margin-top:14px;display:grid}.score-detail-box{border:1px solid var(--line);background:#fff;border-radius:16px;padding:12px}.score-mini-badge{color:#0369a1;background:#e0f2fe;border-radius:999px;justify-content:center;align-items:center;min-width:54px;height:34px;font-size:14px;font-weight:800;display:inline-flex}.pronunciation-history-item{align-items:flex-start}.history-extra-info{color:#64748b;margin-top:6px;font-size:13px;line-height:1.6}@media (width<=900px){.app-title{font-size:42px}.stats-grid{grid-template-columns:repeat(2,1fr)}.primary-action,.secondary-action,.warm-action{font-size:22px}.cards-layout{grid-template-columns:1fr}}@media (width<=640px){.page-shell{padding:24px 14px 110px}.topbar,.hero-header,.page-title-row{flex-direction:column;align-items:stretch}.app-title{font-size:34px}.section-title{font-size:28px}.stats-grid{grid-template-columns:1fr 1fr}.stat-value{font-size:40px}.bottom-nav{gap:8px;width:calc(100% - 12px);padding:10px 8px 14px}.nav-item{padding:12px 6px;font-size:14px}.study-text,.study-answer-text{font-size:22px}.study-actions,.pronunciation-actions,.audio-row{flex-direction:column;align-items:stretch}.small-btn{width:100%}.setting-row{align-items:flex-start}.rate-control{justify-content:space-between}.score-row,.score-detail-grid{grid-template-columns:1fr}}