body {
    background-color: var(--bg, #F2F2F2);
    color: var(--text, #1F2933);
    font-family: var(--font, 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif);
}

.math-rounds-container {
    max-width: 960px;
    margin: 20px auto;
    padding: 0 16px 24px;
}

.math-rounds-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.math-rounds-header h1 {
    margin: 0;
    letter-spacing: 0.05em;
}

.subtitle {
    color: var(--text-secondary, #4B5563);
    margin: 4px 0 0 0;
}

.round-indicator {
    margin-top: 4px;
    font-size: 0.9rem;
    color: var(--text-secondary, #4B5563);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timer {
    font-size: 1.6rem;
    font-weight: 700;
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    padding: 10px 16px;
    border-radius: 12px;
    box-shadow: var(--shadow, 0 4px 16px rgba(0,0,0,0.08));
    color: var(--primary, #2563EB);
}

.panel {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow, 0 4px 16px rgba(0,0,0,0.08));
    margin-bottom: 16px;
}

.hidden { display: none; }

.hud {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.question-box {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
    width: 100%;
}

.question {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text, #1F2933);
}

.answer-form {
    display: flex;
    gap: 10px;
}

.answer-form input {
    appearance: textfield;
    -moz-appearance: textfield;
    -webkit-appearance: textfield;
    padding: 10px;
    font-size: 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--border, #E5E7EB);
    background: var(--surface, #FFFFFF);
    color: var(--text, #1F2933);
    width: 180px;
}

.answer-form input.input-error {
    border-color: var(--danger, #EF4444);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.answer-form button.primary {
    padding: 12px 16px;
}

.submit-button {
    min-width: 180px;
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 18px;
}

.primary {
    background: var(--primary, #2563EB);
    color: #FFFFFF;
    border: none;
    border-radius: var(--radius, 10px);
    padding: 10px 18px;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.05s ease;
}

.primary:hover { background: var(--primary-hover, #1D4ED8); transform: translateY(-1px); }

.shake {
    animation: shake 0.25s linear;
}

@keyframes shake {
    0% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
    100% { transform: translateX(0); }
}

.primary:active { transform: translateY(1px); }

.feedback {
    min-height: 20px;
    color: var(--text-secondary, #4B5563);
}

.panel.breakdown table, .leaderboard-table {
    width: 100%;
    border-collapse: collapse;
}

.panel.breakdown th, .panel.breakdown td, .leaderboard-table th, .leaderboard-table td {
    border-bottom: 1px solid var(--border, #E5E7EB);
    padding: 8px;
    text-align: left;
}

.attribute-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
}

.attribute-card table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.attribute-card th,
.attribute-card td {
    padding: 8px;
    border-bottom: 1px solid var(--border, #E5E7EB);
}

.attribute-card th {
    font-weight: 700;
    color: var(--text, #1F2933);
}

.instructions {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    border-radius: var(--radius, 10px);
    padding: 12px;
    margin-bottom: 12px;
}

.device-line {
    color: var(--text-secondary, #4B5563);
    margin: 6px 0 0 0;
    font-size: 0.95rem;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin-bottom: 12px;
}

.result-grid strong {
    display: inline-block;
    min-width: 120px;
}

.result-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    border-radius: 8px;
    margin-bottom: 12px;
}

.result-table th,
.result-table td {
    padding: 8px 10px;
    text-align: left;
    border-bottom: 1px solid var(--border, #E5E7EB);
}

.result-table th {
    font-weight: 700;
    color: var(--text, #1F2933);
    letter-spacing: 0.3px;
}

.result-table tbody tr:nth-child(even) {
    background: #F9FAFB;
}

.actions {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.link {
    color: var(--primary, #2563EB);
    text-decoration: none;
    border-bottom: 1px dashed var(--primary, #2563EB);
    padding-bottom: 2px;
}

.leaderboard-table tbody tr:nth-child(even) { background: #F9FAFB; }

.tab-row {
    display: inline-flex;
    gap: 8px;
    margin-bottom: 10px;
}

.tab {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    color: var(--text-secondary, #4B5563);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 700;
    letter-spacing: 0.2px;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.tab:hover {
    background: #F3F4F6;
}

.tab.active {
    background: var(--primary, #2563EB);
    color: #FFFFFF;
    border-color: var(--primary, #2563EB);
}

.histogram {
    display: flex;
    gap: 6px;
    align-items: flex-end;
    min-height: 160px;
}

.histogram .bar {
    flex: 1;
    background: var(--primary, #2563EB);
    position: relative;
    border-radius: 6px 6px 0 0;
}

.histogram .bar span {
    position: absolute;
    bottom: -22px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    color: var(--text-secondary, #4B5563);
}

.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    margin-top: 12px;
}

.countdown {
    margin-top: 12px;
    text-align: center;
    font-weight: bold;
    color: var(--text, #1F2933);
}

.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 12px;
}

.difficulty-section h3 { margin-top: 0; }

.muted { color: var(--text-secondary, #4B5563); }

.score-line {
    font-size: 1.4rem;
    font-weight: 700;
}

.keypad {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 6px;
}

.keypad .key-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.keypad button {
    padding: 12px;
    font-size: 1.1rem;
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    color: var(--text, #1F2933);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s ease;
}

.keypad button:hover { background: #F3F4F6; }

.keypad button.primary {
    grid-column: span 3;
}

@media (max-width: 600px) {
    .math-rounds-header { flex-direction: column; align-items: flex-start; }
    .panel { padding: 16px; }
    .answer-form { flex-direction: column; width: 100%; }
    .answer-form input { width: 100%; }
    .submit-button { width: 100%; padding: 14px 16px; }
    .question { font-size: 1.9rem; }
}
/* Post-game stats panel */
.stats-panel { margin-top: 16px; }
.stats-panel h3 { margin: 0 0 10px 0; color: var(--text, #1F2933); font-size: 1.1rem; letter-spacing: 0.03em; }
.stats-table { margin-bottom: 10px; }
.stats-summary { font-size: 0.95rem; color: var(--text-secondary, #4B5563); margin: 8px 0 0 0; }
.stats-summary strong { color: var(--text, #1F2933); }
.trend-up { color: var(--success, #10B981); font-weight: 700; }
.trend-down { color: var(--danger, #EF4444); font-weight: 700; }
.trend-flat { color: var(--text-secondary, #4B5563); font-weight: 700; }

.home-icon {
    color: var(--text, #1F2933);
    font-size: 1.8rem;
    text-decoration: none;
}

/* Medal display */
.medal-display {
    text-align: center;
    margin-top: 16px;
    padding: 16px;
    border-radius: 12px;
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    box-shadow: var(--shadow, 0 4px 16px rgba(0,0,0,0.08));
}

.medal-badge {
    font-size: 3rem;
    margin-bottom: 4px;
}

.medal-label {
    font-size: 1.3rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 4px;
}

.medal-gold .medal-label { color: #B7791F; }
.medal-silver .medal-label { color: #6B7280; }
.medal-bronze .medal-label { color: #92400E; }

.medal-detail {
    font-size: 0.9rem;
    color: var(--text-secondary, #4B5563);
    margin-top: 4px;
}

.medal-no-medal {
    color: var(--text-secondary, #4B5563);
    font-size: 1rem;
}

.medal-progress {
    font-size: 0.85rem;
    color: var(--text-secondary, #4B5563);
    margin-top: 4px;
}