/* ====== Taplai A1 Frontend Styles ====== */
.a1-app{font-family:'Roboto',-apple-system,BlinkMacSystemFont,sans-serif;max-width:1200px;margin:0 auto;padding:16px;color:#222}
.a1-app *{box-sizing:border-box}
.a1-app .material-symbols-outlined{font-size:20px;vertical-align:middle;line-height:1}

.a1-header{text-align:center;margin:8px 0 20px}
.a1-title{font-size:24px;margin:0 0 6px;color:#1a73e8;font-weight:700}
.a1-subtitle{color:#5f6368;margin:0;font-size:14px}

/* ====== Chọn đề ====== */
.a1-exam-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-top:12px}
.a1-exam-card{background:#fff;border:1px solid #e0e0e0;border-radius:10px;padding:18px 14px;cursor:pointer;text-align:center;transition:.15s;display:flex;flex-direction:column;align-items:center;gap:6px;font-family:inherit}
.a1-exam-card:hover{border-color:#1a73e8;box-shadow:0 4px 12px rgba(26,115,232,.12);transform:translateY(-2px)}
.a1-exam-num{width:42px;height:42px;border-radius:50%;background:#1a73e8;color:#fff;display:grid;place-items:center;font-size:18px;font-weight:700}
.a1-exam-name{font-weight:600;font-size:15px}
.a1-exam-sub{font-size:12px;color:#777}
.a1-exam-liet{border-color:#fbbc04;background:#fff8e1}
.a1-exam-liet .material-symbols-outlined{font-size:36px;color:#f57c00}
.a1-exam-liet:hover{border-color:#f57c00}

/* ====== Đang thi ====== */
.a1-exam-header{background:#fff;border:1px solid #e0e0e0;border-radius:10px;padding:12px 16px;margin-bottom:12px}
.a1-exam-meta{display:flex;align-items:center;gap:12px;margin-bottom:8px;flex-wrap:wrap}
.a1-back-btn{background:none;border:1px solid #dadce0;border-radius:6px;padding:6px 12px;cursor:pointer;display:inline-flex;align-items:center;gap:4px;font-family:inherit;font-size:13px;color:#444}
.a1-back-btn:hover{background:#f1f3f4}
.a1-exam-label{font-weight:600;font-size:15px}

.a1-timer-bar{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.a1-timer{font-weight:700;font-size:16px;color:#e53935;display:inline-flex;align-items:center;gap:4px;min-width:90px}
.a1-progress-mini{flex:1;min-width:120px;height:6px;background:#f1f3f4;border-radius:3px;overflow:hidden}
.a1-progress-mini-fill{height:100%;background:linear-gradient(90deg,#34a853,#fbbc04,#e53935);width:100%;transition:width 1s linear}
.a1-answered-count{font-size:13px;color:#5f6368}

.a1-exam-body{display:grid;grid-template-columns:1fr 280px;gap:14px;margin-bottom:12px}
@media (max-width:768px){.a1-exam-body{grid-template-columns:1fr}}

.a1-question-panel{background:#fff;border:1px solid #e0e0e0;border-radius:10px;padding:18px;min-height:300px}
.a1-q-title{font-size:15px;font-weight:600;color:#1a73e8;margin-bottom:10px}
.a1-q-text{font-size:16px;line-height:1.55;margin-bottom:14px;white-space:pre-wrap}
.a1-q-image{margin:10px 0 16px;text-align:center}
.a1-q-image img{max-width:100%;max-height:320px;border:1px solid #e0e0e0;border-radius:6px}
.a1-q-liet{display:inline-block;background:#fce8e6;color:#c5221f;font-size:12px;font-weight:600;padding:2px 8px;border-radius:4px;margin-left:6px}

.a1-answer-list{display:flex;flex-direction:column;gap:8px}
.a1-answer{border:1px solid #e0e0e0;border-radius:8px;padding:12px 14px;cursor:pointer;transition:.12s;display:flex;gap:10px;align-items:flex-start;font-size:15px;line-height:1.5;background:#fff}
.a1-answer:hover{background:#f8f9fa;border-color:#1a73e8}
.a1-answer.selected{background:#e8f0fe;border-color:#1a73e8}
.a1-answer-letter{flex:0 0 24px;height:24px;border-radius:50%;background:#f1f3f4;display:grid;place-items:center;font-size:13px;font-weight:700;color:#5f6368}
.a1-answer.selected .a1-answer-letter{background:#1a73e8;color:#fff}
.a1-answer.correct{background:#e6f4ea;border-color:#34a853}
.a1-answer.correct .a1-answer-letter{background:#34a853;color:#fff}
.a1-answer.wrong{background:#fce8e6;border-color:#ea4335}
.a1-answer.wrong .a1-answer-letter{background:#ea4335;color:#fff}

/* ====== Sidebar ====== */
.a1-sidebar{background:#fff;border:1px solid #e0e0e0;border-radius:10px;padding:14px;display:flex;flex-direction:column;gap:10px;align-self:start;max-height:600px;overflow-y:auto}
.a1-q-numbers{display:grid;grid-template-columns:repeat(auto-fill,minmax(36px,1fr));gap:6px}
.a1-qn{width:100%;aspect-ratio:1/1;border:1px solid #dadce0;border-radius:6px;background:#fff;cursor:pointer;font-size:13px;font-weight:600;color:#5f6368;font-family:inherit;transition:.12s;display:grid;place-items:center;padding:0}
.a1-qn:hover{border-color:#1a73e8}
.a1-qn.current{background:#1a73e8;color:#fff;border-color:#1a73e8}
.a1-qn.answered{background:#e8f0fe;color:#1a73e8;border-color:#1a73e8}
.a1-qn.current.answered{background:#1a73e8;color:#fff}
.a1-qn.correct{background:#e6f4ea;color:#137333;border-color:#34a853}
.a1-qn.wrong{background:#fce8e6;color:#c5221f;border-color:#ea4335}
.a1-qn.liet::after{content:'';position:relative;display:inline-block;width:6px;height:6px;background:#f57c00;border-radius:50%;margin-left:2px;vertical-align:top}

.a1-submit-btn{margin-top:8px;background:#ea4335;color:#fff;border:none;padding:12px;border-radius:8px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;font-family:inherit;font-size:14px}
.a1-submit-btn:hover{background:#c5221f}

/* ====== Nav ====== */
.a1-nav-buttons{display:flex;justify-content:space-between;gap:10px}
.a1-nav-btn{background:#fff;border:1px solid #dadce0;border-radius:8px;padding:10px 18px;cursor:pointer;display:inline-flex;align-items:center;gap:4px;font-family:inherit;font-size:14px;color:#1a73e8;font-weight:500}
.a1-nav-btn:hover{background:#f1f3f4}
.a1-nav-btn:disabled{opacity:.5;cursor:not-allowed}

/* ====== Kết quả ====== */
.a1-result-card{background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:30px;text-align:center;margin-bottom:16px}
.a1-result-icon{font-size:64px;margin-bottom:10px}
.a1-result-icon .material-symbols-outlined{font-size:64px}
.a1-result-pass{color:#34a853}
.a1-result-fail{color:#ea4335}
.a1-result-status{font-size:22px;font-weight:700;margin:6px 0}
.a1-result-score{font-size:40px;font-weight:700;color:#1a73e8;margin:10px 0}
.a1-result-detail{color:#5f6368;font-size:14px;line-height:1.7}
.a1-result-detail strong{color:#222}
.a1-result-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.a1-btn{padding:10px 20px;border-radius:8px;cursor:pointer;font-family:inherit;font-weight:500;display:inline-flex;align-items:center;gap:6px;border:1px solid transparent;font-size:14px}
.a1-btn-primary{background:#1a73e8;color:#fff}
.a1-btn-primary:hover{background:#1765cc}
.a1-btn-secondary{background:#34a853;color:#fff}
.a1-btn-secondary:hover{background:#2d8f47}
.a1-btn-outline{background:#fff;border-color:#dadce0;color:#444}
.a1-btn-outline:hover{background:#f1f3f4}

/* ====== Học mode ====== */
.a1-filter-bar{display:flex;gap:10px;margin-bottom:10px;align-items:center;flex-wrap:wrap}
.a1-filter-buttons{display:flex;gap:6px;flex-wrap:wrap;flex:1}
.a1-filter-btn{background:#fff;border:1px solid #dadce0;border-radius:20px;padding:6px 14px;cursor:pointer;font-family:inherit;font-size:13px;color:#444;display:inline-flex;align-items:center;gap:4px}
.a1-filter-btn:hover{border-color:#1a73e8}
.a1-filter-btn.active{background:#1a73e8;color:#fff;border-color:#1a73e8}
.a1-search-toggle{background:#fff;border:1px solid #dadce0;border-radius:50%;width:38px;height:38px;cursor:pointer;display:grid;place-items:center}
.a1-search-toggle:hover{border-color:#1a73e8}
.a1-search-bar{display:none;align-items:center;gap:8px;background:#fff;border:1px solid #dadce0;border-radius:24px;padding:4px 14px;margin-bottom:10px}
.a1-search-bar.show{display:flex}
.a1-search-bar-icon{color:#5f6368}
.a1-search-input{flex:1;border:none;outline:none;padding:8px 0;font-family:inherit;font-size:14px;background:transparent}
.a1-search-close{background:none;border:none;cursor:pointer;color:#5f6368;display:grid;place-items:center}
.a1-learn-container{display:grid;grid-template-columns:1fr 280px;gap:14px;margin-bottom:12px}
@media (max-width:768px){.a1-learn-container{grid-template-columns:1fr}}

/* Hoc mode — shows correct answer inline */
.a1-hoc .a1-answer.correct{background:#e6f4ea;border-color:#34a853}
.a1-explanation{margin-top:12px;padding:12px;background:#f8f9fa;border-left:3px solid #1a73e8;border-radius:4px;font-size:14px;color:#444;line-height:1.6}

/* Loading */
.a1-loading{text-align:center;padding:40px;color:#5f6368}
.a1-loading .material-symbols-outlined{font-size:36px;animation:a1spin 1s linear infinite}
@keyframes a1spin{from{transform:rotate(0)}to{transform:rotate(360deg)}}