/* Custom premium LIGHT stylesheet for quiz application */
:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.06);
    --text-main: #0f172a;
    --text-muted: #475569;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #ec4899;
    --secondary-hover: #db2777;
    --accent: #059669;
    --accent-hover: #047857;
    --correct-bg: rgba(16, 185, 129, 0.05);
    --correct-border: rgba(16, 185, 129, 0.3);
    --incorrect-bg: rgba(239, 68, 68, 0.05);
    --incorrect-border: rgba(239, 68, 68, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Outfit', 'Noto Sans TC', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding-top: 70px;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.03) 0%, transparent 45%);
    background-attachment: fixed;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    padding: 0 30px;
    z-index: 1000;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
    background: rgba(0,0,0,0.02);
    border: 1px solid var(--card-border);
    padding: 8px 16px;
    border-radius: 10px;
}

.back-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.06);
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-left: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, #0f172a 50%, #4f46e5 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Container Layout */
.app-container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

/* Control Panel Filter Card */
.control-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 30px;
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    margin-bottom: 30px;
}

.filter-tabs {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    padding-bottom: 15px;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-main);
    background: rgba(0,0,0,0.03);
}

.tab-btn.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
    box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.15);
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.filter-group.hide {
    display: none !important;
}

.select-wrapper {
    flex: 1;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.select-wrapper label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.select-wrapper select {
    background: #ffffff;
    border: 1px solid #cbd5e1;
    color: var(--text-main);
    padding: 12px 16px;
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
}

.select-wrapper select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.1);
}

/* Main Layout Split */
.main-content {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 30px;
    align-items: start;
}

@media (max-width: 992px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Questions Section */
.questions-section {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.questions-header {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 15px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.02);
}

.questions-count {
    font-weight: 600;
    color: var(--primary);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    background: var(--card-bg);
    border: 1px dashed rgba(0, 0, 0, 0.1);
    border-radius: 24px;
}

.empty-state i {
    font-size: 3.5rem;
    color: var(--text-muted);
    opacity: 0.4;
    margin-bottom: 20px;
}

.empty-state p {
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 400;
}

/* Question Card */
.question {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 25px;
    box-shadow: 0 10px 20px -10px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.question h2 {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: #ffffff;
    border-radius: 50%;
    font-size: 0.95rem;
    font-weight: 600;
    margin-right: 12px;
    vertical-align: middle;
}

.question-meta {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-left: 5px;
    vertical-align: middle;
}

.meta-badge {
    font-size: 0.75rem;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(0,0,0,0.03);
    border: 1px solid rgba(0,0,0,0.05);
    color: var(--text-muted);
    font-weight: 500;
}

.question-text {
    font-size: 1.05rem;
    font-weight: 500;
    margin-top: 15px;
    margin-bottom: 20px;
    color: var(--text-main);
}

.question-images {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 20px;
}

.question-images img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    background: rgba(0, 0, 0, 0.01);
    padding: 10px;
}

/* Options List */
.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.option-item {
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(0, 0, 0, 0.01);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 14px 20px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.option-item:hover {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(0,0,0,0.12);
}

.option-item input[type="radio"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid #94a3b8;
    border-radius: 50%;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    flex-shrink: 0;
}

.option-item input[type="radio"]:checked {
    border-color: var(--primary);
}

.option-item input[type="radio"]::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary);
    transition: var(--transition);
}

.option-item input[type="radio"]:checked::before {
    transform: translate(-50%, -50%) scale(1);
}

.option-label {
    flex-grow: 1;
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-weight: 500;
}

.option-img {
    margin-top: 5px;
    max-width: 200px;
    height: auto;
    border-radius: 8px;
    border: 1px solid #cbd5e1;
    background: rgba(0, 0, 0, 0.01);
    padding: 6px;
}

/* Correct / Incorrect states on card */
.question.correct {
    background: var(--correct-bg);
    border-color: var(--correct-border);
    box-shadow: 0 0 25px rgba(16, 185, 129, 0.05);
}

.question.incorrect {
    background: var(--incorrect-bg);
    border-color: var(--incorrect-border);
    box-shadow: 0 0 25px rgba(239, 68, 68, 0.05);
}

.option-item.correct-answer {
    background: rgba(16, 185, 129, 0.08) !important;
    border-color: rgba(16, 185, 129, 0.3) !important;
    color: #065f46 !important;
}

.option-item.incorrect-choice {
    background: rgba(239, 68, 68, 0.08) !important;
    border-color: rgba(239, 68, 68, 0.3) !important;
    color: #991b1b !important;
}

/* Status symbol icons next to option */
.status-icon {
    font-size: 1.1rem;
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}
.status-icon.correct { color: #059669; }
.status-icon.incorrect { color: #dc2626; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-check {
    background: rgba(0,0,0,0.02);
    border: 1px solid rgba(0,0,0,0.08);
    color: var(--text-main);
}

.btn-check:hover {
    background: rgba(0,0,0,0.05);
    border-color: rgba(0,0,0,0.15);
}

.btn-submit {
    background: var(--primary);
    color: #ffffff;
    padding: 14px 28px;
    font-size: 1.05rem;
    border-radius: 14px;
    width: 100%;
    margin-top: 20px;
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.2);
}

.btn-submit:hover {
    background: var(--primary-hover);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
}

/* Sidebar Scoreboard Card */
.sidebar {
    position: relative;
}

.score-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 30px;
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.score-card.sticky {
    position: sticky;
    top: 100px;
}

.score-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-main);
}

.score-progress {
    margin-bottom: 25px;
}

.progress-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(closest-side, #ffffff 79%, transparent 80% 100%),
                conic-gradient(#4f46e5 0%, rgba(0,0,0,0.05) 0);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.progress-val {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.score-stats {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    border-radius: 12px;
    background: rgba(0,0,0,0.01);
    border: 1px solid rgba(0,0,0,0.03);
}

.stat-item i {
    margin-right: 6px;
}

.stat-item.correct {
    background: rgba(16, 185, 129, 0.04);
    border-color: rgba(16, 185, 129, 0.1);
    color: #047857;
}

.stat-item.incorrect {
    background: rgba(239, 68, 68, 0.04);
    border-color: rgba(239, 68, 68, 0.1);
    color: #b91c1c;
}

.stat-item.unanswered {
    background: rgba(217, 119, 6, 0.04);
    border-color: rgba(217, 119, 6, 0.1);
    color: #b45309;
}

.stat-val {
    font-weight: 700;
    font-size: 1.1rem;
}