@layer components {
    /* ==========================================================================
       Universal English Grammar Codex & Index Styles (pages/grammar.php)
       ========================================================================== */

    /* Main Container Layout */
    .grammar-index-page {
        max-width: 86rem;
        margin: 0 auto;
        padding: 1.5rem 1.25rem 4rem;
        min-height: 80vh;
    }

    /* Hero Banner */
    .grammar-index-hero {
        position: relative;
        background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(79, 70, 229, 0.06) 50%, rgba(236, 72, 153, 0.08) 100%);
        border: 1px solid color-mix(in srgb, var(--color-border) 80%, #10b981 20%);
        border-radius: 1.5rem;
        padding: 3rem 2rem 2.5rem;
        text-align: center;
        margin-bottom: 2rem;
        overflow: hidden;
        box-shadow: 0 10px 30px -10px rgba(16, 185, 129, 0.08);
    }

    .grammar-index-hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.4rem 1rem;
        font-size: 0.8rem;
        font-weight: 800;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        border-radius: 9999px;
        background: color-mix(in srgb, #10b981 15%, transparent);
        color: #059669;
        border: 1px solid color-mix(in srgb, #10b981 30%, transparent);
        margin-bottom: 1rem;
    }

    .grammar-index-hero-title {
        font-size: clamp(2rem, 4.5vw, 3rem);
        font-weight: 900;
        letter-spacing: -0.03em;
        line-height: 1.15;
        color: var(--color-text-main, #0f172a);
        margin-bottom: 0.75rem;
    }

    .grammar-index-hero-desc {
        font-size: clamp(1rem, 1.8vw, 1.15rem);
        color: var(--color-text-muted, #475569);
        max-width: 50rem;
        margin: 0 auto 2rem;
        line-height: 1.6;
    }

    /* Live Search Toolbar */
    .grammar-index-search-wrap {
        max-width: 44rem;
        margin: 0 auto;
        position: relative;
    }

    .grammar-index-search-bar {
        display: flex;
        align-items: center;
        position: relative;
        background: var(--color-bg-surface, #ffffff);
        border: 2px solid color-mix(in srgb, var(--color-border, #cbd5e1) 85%, #10b981 15%);
        border-radius: 9999px;
        padding: 0.35rem 0.5rem 0.35rem 1.25rem;
        box-shadow: 0 4px 20px -4px rgba(0, 0, 0, 0.08);
        transition: all 0.25s ease;
    }

    .grammar-index-search-bar:focus-within {
        border-color: #10b981;
        box-shadow: 0 0 0 4px color-mix(in srgb, #10b981 20%, transparent), 0 8px 24px -4px rgba(16, 185, 129, 0.15);
    }

    .grammar-index-search-icon {
        color: var(--color-text-muted, #64748b);
        font-size: 1.1rem;
        margin-right: 0.75rem;
    }

    .grammar-index-search-input {
        flex: 1;
        background: transparent;
        border: none;
        outline: none;
        font-size: 1.05rem;
        font-weight: 600;
        color: var(--color-text-main, #0f172a);
        min-width: 0;
    }

    .grammar-index-search-input::placeholder {
        color: var(--color-text-muted, #94a3b8);
        font-weight: 500;
    }

    .grammar-index-clear-btn {
        background: none;
        border: none;
        color: var(--color-text-muted, #94a3b8);
        padding: 0.4rem 0.6rem;
        cursor: pointer;
        display: none;
        font-size: 0.9rem;
        border-radius: 50%;
        transition: color 0.15s ease;
    }

    .grammar-index-clear-btn:hover {
        color: var(--color-text-main, #0f172a);
    }

    /* Syntax Diagrammer Sandbox */
    .grammar-sandbox-card {
        background: var(--color-bg-surface, #ffffff);
        border: 1px solid var(--color-border, #e2e8f0);
        border-radius: 1.25rem;
        padding: 1.5rem;
        box-shadow: var(--shadow-md, 0 4px 6px -1px rgba(0,0,0,0.1));
        text-align: left;
    }

    .syntax-token {
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        padding: 0.35rem 0.65rem;
        margin: 0.25rem 0.2rem;
        border-radius: 0.5rem;
        font-weight: 700;
        font-size: 0.95rem;
        transition: transform 0.15s ease;
        line-height: 1.2;
    }

    .syntax-token .token-role {
        font-size: 0.65rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        font-weight: 800;
        opacity: 0.85;
        margin-top: 0.2rem;
    }

    .syntax-token-subj {
        background: rgba(59, 130, 246, 0.12);
        color: #2563eb;
        border: 1px solid rgba(59, 130, 246, 0.3);
    }

    .syntax-token-verb {
        background: rgba(239, 68, 68, 0.12);
        color: #dc2626;
        border: 1px solid rgba(239, 68, 68, 0.3);
    }

    .syntax-token-obj {
        background: rgba(16, 185, 129, 0.12);
        color: #059669;
        border: 1px solid rgba(16, 185, 129, 0.3);
    }

    .syntax-token-prep {
        background: rgba(139, 92, 246, 0.12);
        color: #7c3aed;
        border: 1px solid rgba(139, 92, 246, 0.3);
    }

    .syntax-token-conj {
        background: rgba(245, 158, 11, 0.12);
        color: #d97706;
        border: 1px solid rgba(245, 158, 11, 0.3);
    }

    .syntax-token-mod {
        background: rgba(236, 72, 153, 0.12);
        color: #db2777;
        border: 1px solid rgba(236, 72, 153, 0.3);
    }

    /* Sticky A–Z Quick-Jump Ribbon */
    .grammar-az-ribbon-container {
        position: sticky;
        top: 4.25rem;
        z-index: 30;
        background: color-mix(in srgb, var(--color-bg-base, #ffffff) 90%, transparent);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-top: 1px solid var(--color-border, #e2e8f0);
        border-bottom: 1px solid var(--color-border, #e2e8f0);
        padding: 0.6rem 0;
        margin: 0 -1.25rem 2rem;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
    }

    .grammar-az-ribbon {
        display: flex;
        align-items: center;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.25rem 0.35rem;
        max-width: 86rem;
        margin: 0 auto;
        padding: 0 1.25rem;
    }

    .grammar-az-letter-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 2rem;
        height: 2rem;
        font-size: 0.85rem;
        font-weight: 800;
        border-radius: 0.5rem;
        color: var(--color-text-main, #0f172a);
        text-decoration: none;
        transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        border: 1px solid transparent;
    }

    .grammar-az-letter-btn:hover:not(.disabled) {
        background: color-mix(in srgb, #10b981 15%, transparent);
        color: #059669;
        border-color: color-mix(in srgb, #10b981 30%, transparent);
        transform: translateY(-1px);
    }

    .grammar-az-letter-btn.active {
        background: #10b981;
        color: #ffffff;
        box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
    }

    .grammar-az-letter-btn.disabled {
        opacity: 0.28;
        pointer-events: none;
        color: var(--color-text-muted, #94a3b8);
    }

    /* Filter Control Panel */
    .grammar-filter-panel {
        background: var(--color-bg-surface, #ffffff);
        border: 1px solid var(--color-border, #e2e8f0);
        border-radius: 1.25rem;
        padding: 1.25rem 1.5rem;
        margin-bottom: 2rem;
        box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.04);
        display: flex;
        flex-direction: column;
        gap: 1rem;
    }

    .grammar-filter-row {
        display: flex;
        align-items: flex-start;
        gap: 1rem;
        flex-wrap: wrap;
    }

    .grammar-filter-label {
        font-size: 0.8rem;
        font-weight: 800;
        letter-spacing: 0.05em;
        text-transform: uppercase;
        color: var(--color-text-muted, #64748b);
        min-width: 8.5rem;
        padding-top: 0.35rem;
        display: flex;
        align-items: center;
        gap: 0.4rem;
    }

    .grammar-pills-wrap {
        display: flex;
        flex-wrap: wrap;
        gap: 0.4rem;
        flex: 1;
    }

    .grammar-pill-btn {
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
        padding: 0.35rem 0.85rem;
        font-size: 0.825rem;
        font-weight: 700;
        border-radius: 9999px;
        background: var(--color-bg-base, #f8fafc);
        color: var(--color-text-main, #334155);
        border: 1px solid var(--color-border, #e2e8f0);
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .grammar-pill-btn:hover {
        border-color: #10b981;
        color: #059669;
        background: color-mix(in srgb, #10b981 8%, transparent);
    }

    .grammar-pill-btn.active {
        background: #10b981;
        color: #ffffff;
        border-color: #10b981;
        box-shadow: 0 4px 10px rgba(16, 185, 129, 0.25);
    }

    .grammar-pill-count {
        font-size: 0.725rem;
        padding: 0.1rem 0.45rem;
        border-radius: 9999px;
        background: rgba(0, 0, 0, 0.08);
        color: inherit;
    }

    .grammar-pill-btn.active .grammar-pill-count {
        background: rgba(255, 255, 255, 0.25);
    }

    /* Status Bar */
    .grammar-status-bar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 1.5rem;
        padding: 0 0.5rem;
        flex-wrap: wrap;
        gap: 1rem;
    }

    .grammar-match-count {
        font-size: 0.9rem;
        font-weight: 600;
        color: var(--color-text-muted, #64748b);
    }

    .grammar-match-count strong {
        color: var(--color-text-main, #0f172a);
    }

    .grammar-view-toggle {
        display: flex;
        gap: 0.5rem;
    }

    .grammar-index-export-btn,
    .grammar-index-print-btn {
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
        padding: 0.45rem 1rem;
        font-size: 0.825rem;
        font-weight: 700;
        border-radius: 9999px;
        background: var(--color-bg-surface, #ffffff);
        color: var(--color-text-main, #334155);
        border: 1px solid var(--color-border, #e2e8f0);
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .grammar-index-export-btn:hover,
    .grammar-index-print-btn:hover {
        border-color: #10b981;
        color: #059669;
    }

    /* Alphabetical Letter Sections */
    .grammar-az-letter-section {
        margin-bottom: 3.5rem;
        scroll-margin-top: 8rem;
    }

    .grammar-az-letter-header {
        display: flex;
        align-items: center;
        gap: 1rem;
        border-bottom: 2px solid color-mix(in srgb, var(--color-border, #e2e8f0) 80%, #10b981 20%);
        padding-bottom: 0.75rem;
        margin-bottom: 1.5rem;
    }

    .grammar-az-letter-badge {
        width: 3rem;
        height: 3rem;
        border-radius: 0.85rem;
        background: linear-gradient(135deg, #10b981, #059669);
        color: #ffffff;
        font-size: 1.5rem;
        font-weight: 900;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 6px 16px -2px rgba(16, 185, 129, 0.35);
    }

    .grammar-az-letter-title {
        font-size: 1.6rem;
        font-weight: 900;
        color: var(--color-text-main, #0f172a);
        margin: 0;
    }

    .grammar-az-letter-count {
        font-size: 0.825rem;
        font-weight: 700;
        color: var(--color-text-muted, #64748b);
        margin-left: auto;
        background: var(--color-bg-base, #f8fafc);
        padding: 0.25rem 0.75rem;
        border-radius: 9999px;
        border: 1px solid var(--color-border, #e2e8f0);
    }

    /* Term Card Grid & Cards */
    .grammar-lexicon-list {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(440px, 1fr));
        gap: 1.5rem;
    }

    @media (max-width: 640px) {
        .grammar-lexicon-list {
            grid-template-columns: 1fr;
        }
    }

    .grammar-term-card {
        background: var(--color-bg-surface, #ffffff);
        border: 1px solid var(--color-border, #e2e8f0);
        border-radius: 1.25rem;
        padding: 1.5rem;
        display: flex;
        flex-direction: column;
        gap: 1rem;
        box-shadow: 0 4px 14px -2px rgba(0, 0, 0, 0.05);
        transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
        position: relative;
    }

    .grammar-term-card:hover {
        transform: translateY(-2px);
        box-shadow: 0 12px 24px -4px rgba(0, 0, 0, 0.09);
        border-color: color-mix(in srgb, var(--color-border, #cbd5e1) 70%, #10b981 30%);
    }

    .grammar-term-card-header {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        gap: 1rem;
    }

    .grammar-term-title-wrap {
        flex: 1;
    }

    .grammar-term-title {
        font-size: 1.3rem;
        font-weight: 900;
        color: var(--color-text-main, #0f172a);
        margin: 0 0 0.35rem 0;
        line-height: 1.25;
    }

    .grammar-term-etymology {
        font-size: 0.8rem;
        color: var(--color-text-muted, #64748b);
        font-family: monospace;
        display: block;
        line-height: 1.4;
    }

    .grammar-term-badges {
        display: flex;
        gap: 0.4rem;
        flex-wrap: wrap;
        margin-top: 0.5rem;
    }

    .grammar-badge-grade,
    .grammar-badge-branch {
        font-size: 0.725rem;
        font-weight: 800;
        text-transform: uppercase;
        letter-spacing: 0.04em;
        padding: 0.2rem 0.6rem;
        border-radius: 9999px;
    }

    .grammar-badge-grade {
        background: rgba(16, 185, 129, 0.12);
        color: #059669;
        border: 1px solid rgba(16, 185, 129, 0.25);
    }

    .grammar-badge-branch {
        background: rgba(79, 70, 229, 0.1);
        color: #4f46e5;
        border: 1px solid rgba(79, 70, 229, 0.25);
    }

    .grammar-term-actions {
        display: flex;
        gap: 0.35rem;
    }

    .grammar-action-btn {
        width: 2.1rem;
        height: 2.1rem;
        border-radius: 0.5rem;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background: var(--color-bg-base, #f8fafc);
        color: var(--color-text-muted, #64748b);
        border: 1px solid var(--color-border, #e2e8f0);
        cursor: pointer;
        transition: all 0.15s ease;
        font-size: 0.85rem;
    }

    .grammar-action-btn:hover {
        background: #10b981;
        color: #ffffff;
        border-color: #10b981;
    }

    .grammar-action-btn.active {
        color: #f59e0b;
        border-color: #f59e0b;
        background: rgba(245, 158, 11, 0.1);
    }

    /* Pattern / Formula Banner */
    .grammar-formula-display {
        background: var(--color-bg-base, #f8fafc);
        border: 1px solid var(--color-border, #e2e8f0);
        border-left: 4px solid #10b981;
        border-radius: 0.75rem;
        padding: 0.75rem 1rem;
        overflow-x: auto;
    }

    .grammar-formula-tag {
        font-size: 0.7rem;
        font-weight: 800;
        text-transform: uppercase;
        color: #10b981;
        letter-spacing: 0.06em;
        margin-bottom: 0.35rem;
        display: flex;
        align-items: center;
        gap: 0.35rem;
    }

    .grammar-formula-code {
        font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
        font-size: 0.95rem;
        font-weight: 700;
        color: var(--color-text-main, #0f172a);
        letter-spacing: 0.02em;
        line-height: 1.5;
    }

    /* Sections inside card */
    .grammar-card-section {
        display: flex;
        flex-direction: column;
        gap: 0.4rem;
    }

    .grammar-section-subtitle {
        font-size: 0.75rem;
        font-weight: 800;
        text-transform: uppercase;
        letter-spacing: 0.06em;
        color: var(--color-text-muted, #64748b);
        display: flex;
        align-items: center;
        gap: 0.35rem;
    }

    .grammar-definition-text {
        font-size: 0.925rem;
        line-height: 1.6;
        color: var(--color-text-main, #1e293b);
        margin: 0;
    }

    .grammar-what-it-does {
        font-size: 0.875rem;
        line-height: 1.55;
        color: var(--color-text-muted, #475569);
        margin: 0;
    }

    .grammar-step-list {
        margin: 0;
        padding-left: 1.25rem;
        font-size: 0.85rem;
        color: var(--color-text-muted, #475569);
        line-height: 1.5;
    }

    .grammar-step-list li {
        margin-bottom: 0.35rem;
    }

    /* Exemplar Box */
    .grammar-example-box {
        background: color-mix(in srgb, #10b981 6%, var(--color-bg-surface, #ffffff));
        border: 1px solid color-mix(in srgb, #10b981 22%, transparent);
        border-radius: 0.85rem;
        padding: 0.85rem 1rem;
        font-size: 0.85rem;
    }

    .grammar-example-problem {
        font-weight: 700;
        color: var(--color-text-main, #0f172a);
        margin-bottom: 0.35rem;
    }

    .grammar-example-solution {
        color: var(--color-text-muted, #334155);
        line-height: 1.5;
    }

    /* Card Footer */
    .grammar-term-card-footer {
        margin-top: auto;
        padding-top: 0.75rem;
        border-top: 1px dashed var(--color-border, #e2e8f0);
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .grammar-codex-link {
        font-size: 0.8rem;
        font-weight: 800;
        color: #059669;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
    }

    .grammar-codex-link:hover {
        text-decoration: underline;
    }

    /* Empty State */
    .grammar-empty-state {
        display: none;
        text-align: center;
        padding: 4rem 1.5rem;
        background: var(--color-bg-surface, #ffffff);
        border: 1px dashed var(--color-border, #cbd5e1);
        border-radius: 1.5rem;
        max-width: 38rem;
        margin: 2rem auto;
    }

    .grammar-empty-state i {
        font-size: 3rem;
        color: var(--color-text-muted, #94a3b8);
        margin-bottom: 1rem;
    }

    .grammar-empty-state h3 {
        font-size: 1.25rem;
        font-weight: 900;
        color: var(--color-text-main, #0f172a);
        margin-bottom: 0.5rem;
    }

    .grammar-empty-state p {
        font-size: 0.9rem;
        color: var(--color-text-muted, #64748b);
        margin-bottom: 1.25rem;
    }

    /* Toast */
    .grammar-toast {
        position: fixed;
        bottom: 2rem;
        right: 2rem;
        background: #0f172a;
        color: #ffffff;
        padding: 0.75rem 1.25rem;
        border-radius: 9999px;
        box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
        display: flex;
        align-items: center;
        gap: 0.5rem;
        font-size: 0.85rem;
        font-weight: 700;
        z-index: 100;
        transform: translateY(100px);
        opacity: 0;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        pointer-events: none;
    }

    .grammar-toast.show {
        transform: translateY(0);
        opacity: 1;
    }

    /* Print Optimization */
    @media print {
        body {
            background: #ffffff !important;
            color: #000000 !important;
        }

        .grammar-index-hero,
        .grammar-az-ribbon-container,
        .grammar-filter-panel,
        .grammar-status-bar,
        .grammar-term-actions,
        .grammar-codex-link,
        .grammar-toast {
            display: none !important;
        }

        .grammar-term-card {
            break-inside: avoid;
            box-shadow: none !important;
            border: 1px solid #94a3b8 !important;
            margin-bottom: 1rem;
        }
    }
}