/* app-strokes.css — parte 6 del split de styles-professional.css (2026-07-18).
   Módulo Strokes & Radicals: catálogo y práctica.
   ORDEN DE CARGA OBLIGATORIO: app-base → header-nav → home → practice →
   browse → strokes → quiz → stats → enhancements → dashboard-extras.
   La cascada depende de este orden; no reordenar los <link>. */

/* ============================================================================
   10. STROKES & RADICALS MODULE
   ============================================================================ */
.strokes-radicals-container {
    background: var(--bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 16px);
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.strokes-radicals-header {
    margin-bottom: 20px;
}

.strokes-radicals-header h2 {
    color: var(--text-main);
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.strokes-radicals-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.strokes-radicals-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.sr-stat-card {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md, 12px);
    padding: 16px;
    text-align: center;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sr-stat-card:hover {
    transform: translateY(-2px);
    border-color: rgba(225, 29, 72, 0.4);
    box-shadow: 0 4px 14px rgba(225, 29, 72, 0.08);
}

.sr-stat-value {
    color: var(--primary);
    font-family: var(--font-mono, monospace);
    font-size: 1.6rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 6px;
}

.sr-stat-label {
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 500;
}

.strokes-radicals-controls {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 20px;
    align-items: end;
}

.sr-search-group {
    min-width: 0;
}

.strokes-radicals-controls .search-input,
.strokes-radicals-controls .select-input {
    max-width: none;
    width: 100%;
}

.sr-search-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.sr-search-icon {
    position: absolute;
    left: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dim);
    pointer-events: none;
    z-index: 2;
}

.sr-search-wrapper .search-input {
    padding-left: 36px;
    padding-right: 36px;
}

.sr-search-clear-btn {
    position: absolute;
    right: 8px;
    display: none;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    background: transparent;
    border: none;
    border-radius: 50%;
    color: var(--text-dim);
    cursor: pointer;
    transition: var(--transition-fast);
}

.sr-search-clear-btn:hover {
    color: var(--primary);
    background: rgba(225, 29, 72, 0.1);
}

.strokes-radicals-reference {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 14px);
    padding: 16px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.sr-reference-header {
    margin-bottom: 12px;
}

.sr-reference-header h3 {
    color: var(--text-main);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.sr-reference-header p {
    color: var(--text-dim);
    font-size: 0.84rem;
}

.sr-reference-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 14px;
}

.sr-reference-stat-card {
    background: var(--bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md, 10px);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sr-reference-stat-value {
    color: var(--primary);
    font-family: var(--font-mono, monospace);
    font-size: 1.05rem;
    font-weight: 800;
    margin-bottom: 2px;
}

.sr-reference-stat-label {
    color: var(--text-dim);
    font-size: 0.75rem;
    font-weight: 500;
}

.sr-reference-sections {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.sr-reference-section h4 {
    color: var(--text-main);
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.sr-reference-grid {
    display: grid;
    gap: 8px;
    max-height: 240px;
    overflow-y: auto;
    padding-right: 4px;
}

.sr-reference-grid-strokes {
    grid-template-columns: repeat(auto-fill, minmax(105px, 1fr));
}

.sr-reference-grid-radicals {
    grid-template-columns: repeat(auto-fill, minmax(88px, 1fr));
}

.sr-reference-card {
    background: var(--bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md, 10px);
    padding: 10px 8px;
    min-height: 90px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sr-reference-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    box-shadow: 0 4px 14px rgba(225, 29, 72, 0.12);
}

.sr-reference-symbol {
    color: var(--text-main);
    font-family: var(--font-chinese, serif);
    font-size: 1.45rem;
    font-weight: 700;
    line-height: 1;
}

.sr-reference-alt-symbol {
    color: var(--text-dim);
    font-family: var(--font-chinese, serif);
    font-size: 0.9rem;
    line-height: 1;
}

.sr-reference-label {
    color: var(--text-muted);
    font-size: 0.74rem;
    line-height: 1.3;
    margin-top: auto;
}

.sr-reference-badge {
    align-self: flex-start;
    color: #3b82f6;
    background: rgba(59, 130, 246, 0.12);
    border: 1px solid rgba(59, 130, 246, 0.25);
    font-size: 0.68rem;
    font-weight: 600;
    border-radius: 999px;
    padding: 2px 7px;
}

.sr-reference-example {
    color: #d97706;
    font-size: 0.7rem;
    font-weight: 600;
}

html[data-theme="dark"] .sr-reference-example {
    color: #fbbf24;
}

.sr-reference-empty {
    color: var(--text-dim);
    font-size: 0.8rem;
    border: 1px dashed var(--color-border);
    border-radius: 8px;
    padding: 12px;
    text-align: center;
}

.strokes-radicals-practice {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 16px);
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.sr-practice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.sr-practice-header h3 {
    color: var(--text-main);
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0;
}

.sr-practice-score-wrap {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.88rem;
}

.sr-practice-score-wrap strong {
    color: var(--primary);
    font-family: var(--font-mono, monospace);
    font-size: 1.05rem;
}

.sr-practice-toolbar {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.sr-practice-difficulty-group {
    margin-bottom: 0;
    max-width: 220px;
}

.sr-practice-difficulty-group .control-label {
    margin-bottom: 6px;
}

.sr-practice-difficulty-group .select-input {
    margin: 0;
}

.sr-practice-metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 14px;
}

.sr-practice-metric {
    background: var(--bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md, 10px);
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sr-practice-metric span {
    color: var(--text-dim);
    font-size: 0.74rem;
    font-weight: 500;
}

.sr-practice-metric strong {
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1;
}

.sr-practice-question {
    color: var(--text-muted);
    font-size: 0.92rem;
    margin-bottom: 12px;
}

.sr-practice-character {
    color: var(--text-main);
    font-family: var(--font-chinese, serif);
    font-size: 2.6rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 8px;
    display: inline-block;
}

.sr-practice-hint {
    color: var(--text-dim);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.sr-practice-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 12px;
}

.sr-practice-option {
    border: 1px solid var(--color-border);
    background: var(--bg-panel);
    color: var(--text-main);
    border-radius: var(--radius-md, 10px);
    padding: 10px 14px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 0.88rem;
    font-weight: 500;
}

.sr-practice-option:hover {
    border-color: var(--primary);
    background: rgba(225, 29, 72, 0.06);
    transform: translateY(-1px);
}

.sr-practice-option.correct {
    border-color: rgba(16, 185, 129, 0.55);
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

html[data-theme="dark"] .sr-practice-option.correct {
    color: #86efac;
}

.sr-practice-option.incorrect {
    border-color: rgba(239, 68, 68, 0.55);
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

html[data-theme="dark"] .sr-practice-option.incorrect {
    color: #fca5a5;
}

.sr-practice-feedback {
    min-height: 22px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.sr-practice-feedback.correct {
    color: #10b981;
}

html[data-theme="dark"] .sr-practice-feedback.correct {
    color: #86efac;
}

.sr-practice-feedback.incorrect {
    color: #ef4444;
}

html[data-theme="dark"] .sr-practice-feedback.incorrect {
    color: #fca5a5;
}

.strokes-radicals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.sr-card {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 14px);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sr-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 3.5px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary), #b91c1c);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.sr-card:hover {
    transform: translateY(-2px);
    border-color: rgba(225, 29, 72, 0.4);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.sr-card:hover::before {
    opacity: 1;
}

.sr-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.sr-character {
    font-family: var(--font-chinese, serif);
    font-size: 2.2rem;
    color: var(--text-main);
    line-height: 1;
}

.sr-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: flex-end;
}

.sr-tag {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: 999px;
    font-size: 0.74rem;
    font-weight: 600;
}

.sr-tag-radical {
    color: #d97706;
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.25);
}

html[data-theme="dark"] .sr-tag-radical {
    color: #fbbf24;
}

.sr-tag-stroke {
    color: #2563eb;
    background: rgba(37, 99, 235, 0.12);
    border: 1px solid rgba(37, 99, 235, 0.25);
}

html[data-theme="dark"] .sr-tag-stroke {
    color: #93c5fd;
}

.sr-pinyin {
    color: var(--primary);
    font-size: 0.95rem;
    font-weight: 600;
}

.sr-meaning {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.45;
    min-height: 40px;
}

.sr-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-top: auto;
}

.sr-level {
    color: var(--text-dim);
    font-size: 0.8rem;
    font-weight: 600;
}

.sr-audio-btn {
    border: 1px solid var(--color-border);
    background: var(--bg-panel);
    color: var(--text-main);
    border-radius: var(--radius-sm, 6px);
    padding: 6px 12px;
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.sr-audio-btn:hover {
    background: rgba(225, 29, 72, 0.08);
    border-color: var(--primary);
    color: var(--primary);
}

.strokes-radicals-empty {
    margin-top: 12px;
    padding: 24px;
    border-radius: var(--radius-lg, 14px);
    border: 1px dashed var(--color-border);
    background: var(--bg-card);
    text-align: center;
}

.strokes-radicals-empty h3 {
    color: var(--text-main);
    margin-bottom: 4px;
    font-size: 1rem;
}

.strokes-radicals-empty p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .strokes-radicals-stats,
    .strokes-radicals-controls {
        grid-template-columns: 1fr;
    }

    .sr-reference-stats,
    .sr-reference-sections {
        grid-template-columns: 1fr;
    }

    .sr-reference-grid {
        max-height: 200px;
    }

    .sr-practice-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .sr-practice-difficulty-group {
        max-width: none;
    }

    .sr-practice-metrics {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .sr-practice-options {
        grid-template-columns: 1fr;
    }

    .sr-card-top {
        align-items: flex-start;
    }
}

/* ============================================================================
   10.3 HANZI DRAWING CANVAS
   ============================================================================ */
.strokes-radicals-canvas-section {
    background: var(--bg-panel);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg, 16px);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.sr-canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 20px;
}

.sr-canvas-title-group h3 {
    color: var(--text-main);
    font-size: 1.2rem;
    font-weight: 800;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.01em;
}

.sr-canvas-title-group p {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin: 0;
}

.hz-active-char-badge {
    background: rgba(225, 29, 72, 0.08);
    border: 1.5px solid rgba(225, 29, 72, 0.3);
    border-radius: var(--radius-md, 10px);
    padding: 6px 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.88rem;
    color: var(--text-muted);
    font-weight: 600;
}

.hz-active-char-badge strong {
    font-family: var(--font-chinese, serif);
    font-size: 1.6rem;
    color: var(--primary);
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: rgba(225, 29, 72, 0.12);
    border: 1px solid rgba(225, 29, 72, 0.25);
    border-radius: 6px;
    text-shadow: 0 0 10px rgba(225, 29, 72, 0.25);
}

.sr-canvas-workspace {
    display: flex;
    gap: 28px;
    align-items: flex-start;
    flex-wrap: wrap;
    justify-content: center;
}

.sr-canvas-drawing-area {
    background: var(--bg-card);
    border: 2px solid var(--color-border);
    border-radius: 18px;
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.08);
}

#hanzi-draw-canvas {
    background: #fffdf9; /* Warm Xuan paper / rice paper */
    border-radius: 12px;
    cursor: crosshair;
    touch-action: none;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.03);
}

html[data-theme="dark"] #hanzi-draw-canvas {
    background: #111215; /* Deep inkstone slate */
    box-shadow: inset 0 0 12px rgba(0, 0, 0, 0.5);
}

.sr-canvas-side-tools {
    flex: 1;
    min-width: 280px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.sr-tool-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sr-tool-group .control-label {
    font-size: 0.84rem;
    color: var(--text-muted);
    font-weight: 600;
}

.hz-char-input-wrap {
    display: flex;
    gap: 8px;
    align-items: center;
}

.hz-char-input-wrap input {
    width: 80px;
    text-align: center;
    font-family: var(--font-chinese, serif);
    font-size: 1.4rem;
    font-weight: 700;
    padding: 6px 8px;
    border-radius: var(--radius-sm, 6px);
}

.hz-quick-chars-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.hz-quick-char {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    width: 40px;
    height: 40px;
    font-family: var(--font-chinese, serif);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.hz-quick-char:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    background: rgba(225, 29, 72, 0.12);
    color: var(--primary);
}

.hz-color-chips-list {
    display: flex;
    gap: 12px;
}

.hz-color-chip {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

.hz-color-chip:hover {
    transform: scale(1.15);
}

.hz-color-chip.active {
    border-color: white;
    box-shadow: 0 0 0 2px var(--primary), 0 2px 8px rgba(0, 0, 0, 0.2);
    transform: scale(1.1);
}

.sr-canvas-actions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 6px;
}

.sr-canvas-actions-grid .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.86rem;
    padding: 9px 12px;
    border-radius: var(--radius-md, 8px);
    font-weight: 600;
}

#hanzi-canvas-ghost-toggle.active {
    background: rgba(225, 29, 72, 0.12);
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary);
}

@media (max-width: 640px) {
    .sr-canvas-workspace {
        flex-direction: column;
        align-items: center;
    }
}