/**
 * PUMKIN.DEV Academic Architecture
 * Stylesheet: math_solver.css
 * Features: High-contrast WCAG 2.1 AA, Mobile Touch Target >= 44px, Keyboard Focus Rings
 */

/* Container and Layout */
.math-solver-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px 16px 60px 16px;
    font-family: inherit;
    color: var(--text-main, #0f172a);
}

.math-solver-header {
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border-color, #e2e8f0);
    padding-bottom: 16px;
}

.math-solver-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary, #1e3a8a);
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 6px 0;
}

.math-solver-subtitle {
    font-size: 14px;
    color: var(--text-muted, #64748b);
    margin: 0;
    line-height: 1.5;
}

/* Feature Flag Banner */
.math-beta-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 8px;
    padding: 10px 14px;
    margin-bottom: 20px;
    font-size: 13px;
    color: #1e40af;
}

/* Tab Navigation */
.math-tabs-nav {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border-color, #e2e8f0);
    margin-bottom: 20px;
    overflow-x: auto;
}

.math-tab-btn {
    min-height: 44px;
    min-width: 44px;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted, #64748b);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.math-tab-btn:hover {
    color: var(--primary, #1e3a8a);
    background: #f8fafc;
}

.math-tab-btn.active {
    color: var(--primary, #1e3a8a);
    border-bottom-color: var(--primary, #1e3a8a);
    background: transparent;
}

.math-tab-btn:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: -2px;
}

/* Input Card & Quick Samples */
.math-card {
    background: var(--bg-card, #ffffff);
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    margin-bottom: 24px;
}

.math-textarea-label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-main, #0f172a);
    margin-bottom: 8px;
}

.math-textarea {
    width: 100%;
    min-height: 110px;
    padding: 12px;
    border: 1.5px solid var(--border-color, #cbd5e1);
    border-radius: 8px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    background: #ffffff;
    color: #0f172a;
    resize: vertical;
    box-sizing: border-box;
}

.math-textarea:focus {
    border-color: var(--primary, #1e3a8a);
    outline: 2px solid rgba(30, 58, 138, 0.2);
}

.math-textarea:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 1px;
}

/* Quick Sample Chips */
.math-samples-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0 18px 0;
    align-items: center;
}

.math-samples-label {
    font-size: 12.5px;
    font-weight: 700;
    color: var(--text-muted, #64748b);
    margin-right: 4px;
}

.math-chip-btn {
    min-height: 44px;
    padding: 8px 14px;
    font-size: 13px;
    font-weight: 600;
    background: #f1f5f9;
    color: #1e293b;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.math-chip-btn:hover {
    background: #e2e8f0;
    color: var(--primary, #1e3a8a);
}

.math-chip-btn:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 2px;
}

/* Action Bar */
.math-actions-bar {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.btn-math-primary {
    min-height: 44px;
    min-width: 140px;
    padding: 10px 22px;
    font-size: 15px;
    font-weight: 700;
    background: var(--primary, #1e3a8a);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 2px 4px rgba(30, 58, 138, 0.2);
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-math-primary:hover:not(:disabled) {
    background: #172554;
    transform: translateY(-1px);
}

.btn-math-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-math-primary:disabled {
    background: #94a3b8;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-math-primary:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 2px;
}

.btn-math-clear {
    min-height: 44px;
    min-width: 44px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    background: transparent;
    color: var(--text-muted, #64748b);
    border: 1px solid var(--border-color, #cbd5e1);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-math-clear:hover {
    background: #f8fafc;
    color: #0f172a;
}

.btn-math-clear:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 2px;
}

/* Status Badges */
.pumkin-math-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13.5px;
    font-weight: 700;
    letter-spacing: 0.2px;
}

.pumkin-math-badge.badge-verified {
    background: #ecfdf5;
    color: #065f46;
    border: 1.5px solid #a7f3d0;
}

.pumkin-math-badge.badge-numeric {
    background: #f0fdfa;
    color: #0f766e;
    border: 1.5px solid #99f6e4;
}

.pumkin-math-badge.badge-needs-review {
    background: #fffbeb;
    color: #92400e;
    border: 1.5px solid #fde68a;
}

.pumkin-math-badge.badge-unsupported {
    background: #f8fafc;
    color: #334155;
    border: 1.5px solid #cbd5e1;
}

/* Restate VI Banner */
.math-restate-banner {
    background: #f0fdf4;
    border-left: 4px solid #16a34a;
    border-radius: 6px;
    padding: 12px 16px;
    margin: 16px 0;
    font-size: 14.5px;
    line-height: 1.6;
}

.restate-label {
    font-weight: 700;
    color: #15803d;
    margin-right: 6px;
}

.restate-content {
    color: #0f172a;
}

/* Results & Steps Card */
.math-result-card {
    background: #ffffff;
    border: 1.5px solid var(--border-color, #e2e8f0);
    border-radius: 10px;
    padding: 22px;
    margin-top: 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.math-result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding-bottom: 14px;
    border-bottom: 1px solid #f1f5f9;
}

.math-final-answer-box {
    background: #f8fafc;
    border: 1.5px solid #cbd5e1;
    border-radius: 8px;
    padding: 14px 18px;
    margin: 16px 0;
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
}

.math-final-answer-label {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary, #1e3a8a);
}

.math-final-answer-value {
    font-size: 18px;
    font-weight: 800;
    color: #0f172a;
}

/* Step-by-Step Reasoning Traces */
.math-steps-list {
    margin-top: 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.math-step-item {
    background: #fafafa;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 14px 16px;
    transition: border-color 0.2s ease;
}

.math-step-item:hover {
    border-color: #cbd5e1;
}

.math-step-title {
    font-size: 13.5px;
    font-weight: 700;
    color: var(--primary, #1e3a8a);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.math-step-content {
    font-size: 14px;
    line-height: 1.65;
    color: #1e293b;
}

/* Loading & Cold-Start Indicator */
.math-loading-state {
    padding: 32px 20px;
    text-align: center;
    background: #f8fafc;
    border: 1.5px dashed #cbd5e1;
    border-radius: 10px;
    margin-top: 20px;
}

.math-spinner {
    display: inline-block;
    width: 38px;
    height: 38px;
    border: 3.5px solid #e2e8f0;
    border-top-color: var(--primary, #1e3a8a);
    border-radius: 50%;
    animation: math-spin 0.8s linear infinite;
    margin-bottom: 12px;
}

@keyframes math-spin {
    to { transform: rotate(360deg); }
}

.math-loading-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary, #1e3a8a);
    margin-bottom: 6px;
}

.math-loading-desc {
    font-size: 13.5px;
    color: var(--text-muted, #64748b);
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Error & Graceful Degradation State */
.math-error-state {
    padding: 22px;
    background: #fef2f2;
    border: 1.5px solid #fecaca;
    border-radius: 10px;
    margin-top: 20px;
    color: #991b1b;
}

.math-error-title {
    font-size: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.math-error-msg {
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.btn-math-retry {
    min-height: 44px;
    min-width: 120px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 700;
    background: #dc2626;
    color: #ffffff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 1px 3px rgba(220, 38, 38, 0.2);
    transition: background 0.15s ease;
}

.btn-math-retry:hover {
    background: #b91c1c;
}

.btn-math-retry:focus-visible {
    outline: 3px solid #ef4444;
    outline-offset: 2px;
}

/* Meta telemetry */
.math-meta-telemetry {
    margin-top: 14px;
    padding-top: 12px;
    border-top: 1px dashed #e2e8f0;
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted, #64748b);
    flex-wrap: wrap;
    gap: 8px;
}

/* Responsive adjustments */
@media (max-width: 640px) {
    .math-actions-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-math-primary, .btn-math-clear {
        width: 100%;
    }

    .math-final-answer-box {
        flex-direction: column;
        gap: 4px;
    }
}

/* Live KaTeX Preview */
.math-preview-container {
    margin: 14px 0;
    padding: 12px 14px;
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: 8px;
}
.math-preview-header {
    font-size: 12.5px;
    font-weight: 700;
    color: #475569;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.math-preview-box {
    min-height: 38px;
    padding: 8px 12px;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 15px;
    line-height: 1.6;
    color: #0f172a;
    overflow-x: auto;
}
.math-preview-placeholder {
    color: #94a3b8;
    font-style: italic;
    font-size: 13.5px;
}

/* Restate Header & Edit Button */
.math-restate-banner {
    background: #eff6ff;
    border: 1.5px solid #bfdbfe;
    border-radius: 8px;
    padding: 14px;
    margin: 16px 0;
}
.math-restate-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 8px;
}
.restate-label {
    font-size: 13.5px;
    font-weight: 700;
    color: #1e40af;
}
.btn-restate-edit {
    min-height: 44px;
    padding: 8px 14px;
    background: #ffffff;
    border: 1px solid #93c5fd;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    color: #1d4ed8;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s ease;
}
.btn-restate-edit:hover {
    background: #dbeafe;
}
.btn-restate-edit:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 2px;
}
.restate-content {
    font-size: 15px;
    color: #1e3a8a;
    line-height: 1.5;
}

/* Socratic Multi-tier Scaffolding */
.math-hints-container {
    margin: 18px 0;
    padding: 16px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
}
.math-hints-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}
.math-hints-title {
    font-size: 14px;
    font-weight: 800;
    color: var(--primary, #1e3a8a);
    display: flex;
    align-items: center;
    gap: 6px;
}
.math-hints-nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.btn-hint-tier {
    min-height: 44px;
    padding: 8px 16px;
    background: #ffffff;
    border: 1.5px solid #cbd5e1;
    border-radius: 6px;
    font-size: 13.5px;
    font-weight: 600;
    color: #334155;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s ease;
}
.btn-hint-tier:hover {
    border-color: #3b82f6;
    color: #1d4ed8;
    background: #eff6ff;
}
.btn-hint-tier.active {
    background: #1e3a8a;
    color: #ffffff;
    border-color: #1e3a8a;
}
.btn-hint-tier:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 2px;
}
.math-hint-content-box {
    padding: 14px;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 14.5px;
    line-height: 1.6;
    color: #1e293b;
    margin-bottom: 14px;
}
.btn-show-solution {
    min-height: 44px;
    padding: 10px 18px;
    background: #f1f5f9;
    border: 1.5px solid #cbd5e1;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 700;
    color: #1e293b;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.15s ease;
}
.btn-show-solution:hover {
    background: #e2e8f0;
}
.btn-show-solution:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 2px;
}

/* Misconception Reminder Box */
.math-misconception-box {
    margin: 14px 0;
    padding: 12px 14px;
    background: #fefce8;
    border: 1.5px solid #fef08a;
    border-left: 4px solid #eab308;
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.5;
    color: #854d0e;
}

/* Report Error Button */
.btn-report-error {
    min-height: 44px;
    padding: 8px 14px;
    background: transparent;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    font-size: 12.5px;
    font-weight: 600;
    color: #64748b;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s ease;
}
.btn-report-error:hover {
    background: #fee2e2;
    border-color: #fca5a5;
    color: #b91c1c;
}
.btn-report-error:focus-visible {
    outline: 3px solid #ef4444;
    outline-offset: 2px;
}

/* Bank Selection Dropdown & Controls */
.math-bank-controls {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
    align-items: center;
}
.math-bank-select {
    min-height: 44px;
    padding: 8px 12px;
    border: 1.5px solid #cbd5e1;
    border-radius: 6px;
    font-size: 14px;
    color: #1e293b;
    background: #ffffff;
    flex: 1;
    min-width: 260px;
}
.math-bank-select:focus-visible {
    outline: 3px solid #2563eb;
    outline-offset: 2px;
}