@layer components {
    /* ==========================================================================
       Universal Mathematics Codex & Index Styles (pages/math.php)
       ========================================================================== */

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

    /* Hero Banner */
    .math-index-hero {
        position: relative;
        background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(14, 165, 233, 0.05) 50%, rgba(99, 102, 241, 0.08) 100%);
        border: 1px solid color-mix(in srgb, var(--color-border) 80%, var(--color-primary) 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(79, 70, 229, 0.07);
    }

    .math-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, var(--color-primary) 15%, transparent);
        color: var(--color-primary);
        border: 1px solid color-mix(in srgb, var(--color-primary) 30%, transparent);
        margin-bottom: 1rem;
    }

    .math-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-default);
        margin-bottom: 0.75rem;
    }

    .math-index-hero-desc {
        font-size: clamp(1rem, 1.8vw, 1.15rem);
        color: var(--color-text-secondary);
        max-width: 48rem;
        margin: 0 auto 2rem;
        line-height: 1.6;
    }

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

    .math-index-search-bar {
        display: flex;
        align-items: center;
        position: relative;
        background: var(--color-content-bg);
        border: 2px solid color-mix(in srgb, var(--color-border) 85%, var(--color-primary) 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;
    }

    .math-index-search-bar:focus-within {
        border-color: var(--color-primary);
        box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-primary) 20%, transparent), 0 8px 24px -4px rgba(79, 70, 229, 0.15);
    }

    .math-index-search-icon {
        color: var(--color-text-muted);
        font-size: 1.1rem;
        margin-right: 0.75rem;
    }

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

    .math-index-search-input::placeholder {
        color: var(--color-text-muted);
        font-weight: 500;
    }

    .math-index-clear-btn {
        background: none;
        border: none;
        color: var(--color-text-muted);
        cursor: pointer;
        padding: 0.5rem 0.75rem;
        font-size: 0.95rem;
        border-radius: 9999px;
        transition: color 0.2s ease;
        display: none;
    }

    .math-index-clear-btn:hover {
        color: var(--color-text-default);
    }

    .math-index-export-btn,
    .math-index-print-btn {
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
        padding: 0.6rem 1rem;
        border-radius: 9999px;
        border: 1px solid var(--color-border);
        background: var(--color-content-bg);
        color: var(--color-text-default);
        font-weight: 700;
        font-size: 0.85rem;
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .math-index-export-btn:hover,
    .math-index-print-btn:hover {
        background: color-mix(in srgb, var(--color-primary) 10%, transparent);
        border-color: var(--color-primary);
        color: var(--color-primary);
    }

    /* Interactive Filter Bar */
    .math-filter-panel {
        background: var(--color-content-bg);
        border: 1px solid var(--color-border);
        border-radius: 1.25rem;
        padding: 1.25rem 1.5rem;
        margin-bottom: 2rem;
        box-shadow: 0 4px 16px -2px rgba(0, 0, 0, 0.04);
    }

    .math-filter-row {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        flex-wrap: wrap;
    }

    .math-filter-row:not(:last-child) {
        margin-bottom: 1rem;
        padding-bottom: 1rem;
        border-bottom: 1px dashed var(--color-border);
    }

    .math-filter-label {
        font-size: 0.8rem;
        font-weight: 800;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--color-text-muted);
        min-width: 6.5rem;
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
    }

    .math-pills-wrap {
        display: flex;
        align-items: center;
        gap: 0.4rem;
        flex-wrap: wrap;
        flex: 1;
    }

    .math-pill-btn {
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
        padding: 0.4rem 0.85rem;
        font-size: 0.85rem;
        font-weight: 700;
        border-radius: 9999px;
        border: 1px solid var(--color-border);
        background: var(--color-bg-base);
        color: var(--color-text-secondary);
        cursor: pointer;
        transition: all 0.18s ease;
        user-select: none;
    }

    .math-pill-btn:hover {
        border-color: var(--color-primary);
        color: var(--color-text-default);
        transform: translateY(-1px);
    }

    .math-pill-btn.active {
        background: var(--color-primary);
        border-color: var(--color-primary);
        color: #ffffff !important;
        box-shadow: 0 3px 12px -2px color-mix(in srgb, var(--color-primary) 50%, transparent);
    }

    .math-pill-count {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 0.1rem 0.45rem;
        font-size: 0.72rem;
        font-weight: 800;
        border-radius: 9999px;
        background: rgba(0, 0, 0, 0.08);
        color: inherit;
    }

    .math-pill-btn.active .math-pill-count {
        background: rgba(255, 255, 255, 0.25);
        color: #ffffff;
    }

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

    .math-match-count {
        font-size: 0.95rem;
        font-weight: 700;
        color: var(--color-text-secondary);
    }

    .math-match-count strong {
        color: var(--color-primary);
    }

    .math-view-toggle {
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    /* A-Z Alphabetical Sticky Quick-Jump Ribbon */
    .math-az-ribbon-container {
        position: sticky;
        top: 4.5rem;
        z-index: 30;
        background: color-mix(in srgb, var(--color-content-bg) 88%, transparent);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border: 1px solid var(--color-border);
        border-radius: 9999px;
        padding: 0.4rem 0.75rem;
        margin: 0 auto 2rem;
        max-width: 60rem;
        box-shadow: 0 4px 20px -4px rgba(0, 0, 0, 0.08);
    }

    .math-az-ribbon {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 0.25rem;
        overflow-x: auto;
        scrollbar-width: none;
    }

    .math-az-ribbon::-webkit-scrollbar {
        display: none;
    }

    .math-az-letter-btn {
        width: 2rem;
        height: 2rem;
        flex-shrink: 0;
        border-radius: 50%;
        border: 1px solid transparent;
        background: transparent;
        color: var(--color-text-default);
        font-weight: 800;
        font-size: 0.85rem;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all 0.18s ease;
        text-decoration: none;
    }

    .math-az-letter-btn:hover {
        background: color-mix(in srgb, var(--color-primary) 15%, transparent);
        color: var(--color-primary);
        transform: translateY(-1px);
    }

    .math-az-letter-btn.active {
        background: var(--color-primary);
        color: #ffffff;
        box-shadow: 0 2px 8px color-mix(in srgb, var(--color-primary) 50%, transparent);
    }

    .math-az-letter-btn.disabled {
        opacity: 0.28;
        cursor: not-allowed;
        pointer-events: none;
    }

    /* A-Z Letter Sections */
    .math-az-letter-section {
        margin-bottom: 3.5rem;
        scroll-margin-top: 8.5rem;
    }

    .math-az-letter-header {
        display: flex;
        align-items: center;
        gap: 1rem;
        margin-bottom: 1.5rem;
        padding-bottom: 0.5rem;
        border-bottom: 2px solid color-mix(in srgb, var(--color-border) 70%, var(--color-primary) 30%);
    }

    .math-az-letter-badge {
        width: 3rem;
        height: 3rem;
        border-radius: 0.85rem;
        background: color-mix(in srgb, var(--color-primary) 15%, transparent);
        color: var(--color-primary);
        border: 1px solid color-mix(in srgb, var(--color-primary) 30%, transparent);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        font-weight: 900;
        letter-spacing: -0.02em;
    }

    .math-az-letter-title {
        font-size: 1.4rem;
        font-weight: 900;
        color: var(--color-text-default);
        margin: 0;
    }

    .math-az-letter-count {
        margin-left: auto;
        font-size: 0.85rem;
        font-weight: 700;
        color: var(--color-text-muted);
        background: var(--color-bg-base);
        padding: 0.25rem 0.75rem;
        border-radius: 9999px;
        border: 1px solid var(--color-border);
    }

    /* A-Z Lexicon Entries List (Replacing Loose Cards Grid) */
    .math-lexicon-list {
        display: flex;
        flex-direction: column;
        gap: 1.75rem;
    }

    /* Lexicon Entry Architecture */
    .math-lexicon-entry {
        background: var(--color-content-bg);
        border: 1px solid var(--color-border);
        border-radius: 1.25rem;
        padding: 1.75rem 2rem;
        box-shadow: 0 4px 20px -4px rgba(0, 0, 0, 0.05);
        display: flex;
        flex-direction: column;
        gap: 1.25rem;
        transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        position: relative;
    }

    .math-lexicon-entry:hover {
        border-color: color-mix(in srgb, var(--color-border) 60%, var(--color-primary) 40%);
        box-shadow: 0 10px 28px -6px rgba(0, 0, 0, 0.09);
    }

    /* Two-Column Internal Layout for Lexicon Entries */
    .math-lexicon-body-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.25rem;
    }

    @media (max-width: 860px) {
        .math-lexicon-body-grid {
            grid-template-columns: 1fr;
        }
        .math-lexicon-entry {
            padding: 1.25rem;
        }
    }

    /* Card Header */
    .math-term-card-header {
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        gap: 0.75rem;
    }

    .math-term-title-wrap {
        flex: 1;
        min-width: 0;
    }

    .math-term-title {
        font-size: 1.35rem;
        font-weight: 900;
        letter-spacing: -0.02em;
        color: var(--color-text-default);
        margin: 0 0 0.35rem 0;
        display: flex;
        align-items: baseline;
        gap: 0.5rem;
        flex-wrap: wrap;
    }

    .math-term-etymology {
        font-size: 0.8rem;
        font-style: italic;
        font-weight: 500;
        color: var(--color-text-muted);
    }

    .math-term-badges {
        display: flex;
        align-items: center;
        gap: 0.35rem;
        flex-wrap: wrap;
    }

    .math-badge-grade {
        font-size: 0.75rem;
        font-weight: 800;
        padding: 0.2rem 0.6rem;
        border-radius: 9999px;
        background: color-mix(in srgb, var(--color-primary) 15%, transparent);
        color: var(--color-primary);
        border: 1px solid color-mix(in srgb, var(--color-primary) 30%, transparent);
    }

    .math-badge-branch {
        font-size: 0.75rem;
        font-weight: 700;
        padding: 0.2rem 0.6rem;
        border-radius: 9999px;
        background: rgba(0, 0, 0, 0.05);
        color: var(--color-text-secondary);
        border: 1px solid var(--color-border);
    }

    /* Card Action Tools */
    .math-term-actions {
        display: flex;
        align-items: center;
        gap: 0.3rem;
        flex-shrink: 0;
    }

    .math-action-btn {
        background: var(--color-bg-base);
        border: 1px solid var(--color-border);
        color: var(--color-text-secondary);
        width: 2rem;
        height: 2rem;
        border-radius: 50%;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 0.85rem;
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .math-action-btn:hover {
        background: var(--color-primary);
        border-color: var(--color-primary);
        color: #ffffff;
        transform: scale(1.05);
    }

    .math-action-btn.active {
        color: #eab308;
        border-color: #eab308;
        background: rgba(234, 179, 8, 0.1);
    }

    /* Formal Definition Box */
    .math-idx-def-box {
        background: color-mix(in srgb, var(--color-bg-base) 70%, transparent);
        border-left: 4px solid var(--color-primary);
        border-radius: 0 0.75rem 0.75rem 0;
        padding: 0.85rem 1rem;
    }

    .math-idx-box-label {
        font-size: 0.72rem;
        font-weight: 800;
        text-transform: uppercase;
        letter-spacing: 0.06em;
        color: var(--color-primary);
        margin-bottom: 0.4rem;
        display: flex;
        align-items: center;
        gap: 0.35rem;
    }

    .math-idx-def-text {
        font-size: 0.95rem;
        line-height: 1.55;
        color: var(--color-text-default);
        margin: 0 0 0.5rem 0;
    }

    .math-idx-formula-card {
        background: var(--color-content-bg);
        border: 1px dashed var(--color-border);
        border-radius: 0.5rem;
        padding: 0.5rem 0.75rem;
        margin-top: 0.5rem;
        text-align: center;
        overflow-x: auto;
    }

    /* What It Does Box (Intuition & Mechanism) */
    .math-idx-does-box {
        background: rgba(14, 165, 233, 0.05);
        border: 1px solid rgba(14, 165, 233, 0.2);
        border-radius: 0.75rem;
        padding: 0.85rem 1rem;
    }

    .math-idx-does-box .math-idx-box-label {
        color: #0284c7;
    }

    .math-idx-does-text {
        font-size: 0.92rem;
        line-height: 1.5;
        color: var(--color-text-default);
        margin: 0;
    }

    /* How to Do It Box (Step-by-Step Procedure) */
    .math-idx-howto-box {
        background: rgba(16, 185, 129, 0.04);
        border: 1px solid rgba(16, 185, 129, 0.2);
        border-radius: 0.75rem;
        padding: 0.85rem 1rem;
    }

    .math-idx-howto-box .math-idx-box-label {
        color: #059669;
    }

    .math-idx-steps-list {
        margin: 0;
        padding: 0;
        list-style: none;
        display: flex;
        flex-direction: column;
        gap: 0.45rem;
    }

    .math-idx-step-item {
        display: flex;
        align-items: flex-start;
        gap: 0.55rem;
        font-size: 0.9rem;
        line-height: 1.45;
        color: var(--color-text-default);
    }

    .math-idx-step-num {
        flex-shrink: 0;
        width: 1.35rem;
        height: 1.35rem;
        border-radius: 50%;
        background: #10b981;
        color: #ffffff;
        font-size: 0.72rem;
        font-weight: 800;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        margin-top: 0.1rem;
    }

    /* Exemplum Box (Worked Example) */
    .math-idx-example-box {
        background: rgba(245, 158, 11, 0.05);
        border: 1px solid rgba(245, 158, 11, 0.25);
        border-radius: 0.75rem;
        padding: 0.85rem 1rem;
    }

    .math-idx-example-box .math-idx-box-label {
        color: #d97706;
    }

    .math-idx-problem {
        font-size: 0.92rem;
        font-weight: 700;
        color: var(--color-text-default);
        margin: 0 0 0.4rem 0;
    }

    .math-idx-solution {
        font-size: 0.88rem;
        line-height: 1.5;
        color: var(--color-text-secondary);
        margin: 0 0 0.4rem 0;
        padding-left: 0.5rem;
        border-left: 2px solid rgba(245, 158, 11, 0.35);
    }

    .math-idx-qed {
        text-align: right;
        font-size: 0.8rem;
        font-weight: 800;
        color: #d97706;
        font-style: italic;
    }

    /* Card Footer & Codex Deep Link */
    .math-term-footer {
        margin-top: auto;
        padding-top: 0.75rem;
        border-top: 1px solid var(--color-border);
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 0.5rem;
        font-size: 0.82rem;
    }

    .math-codex-link {
        display: inline-flex;
        align-items: center;
        gap: 0.35rem;
        color: var(--color-primary);
        font-weight: 700;
        text-decoration: none;
        transition: gap 0.2s ease, color 0.2s ease;
    }

    .math-codex-link:hover {
        gap: 0.6rem;
        text-decoration: underline;
    }

    /* Empty Search State */
    .math-empty-state {
        text-align: center;
        padding: 4rem 1.5rem;
        background: var(--color-content-bg);
        border: 2px dashed var(--color-border);
        border-radius: 1.5rem;
        margin: 2rem 0;
        display: none;
    }

    .math-empty-state i {
        font-size: 3rem;
        color: var(--color-text-muted);
        margin-bottom: 1rem;
    }

    .math-empty-state h3 {
        font-size: 1.5rem;
        font-weight: 800;
        color: var(--color-text-default);
        margin-bottom: 0.5rem;
    }

    .math-empty-state p {
        color: var(--color-text-secondary);
        max-width: 28rem;
        margin: 0 auto 1.5rem;
        font-size: 0.95rem;
    }

    /* Toast Notification */
    .math-toast {
        position: fixed;
        bottom: 2rem;
        right: 2rem;
        background: var(--color-text-default);
        color: var(--color-content-bg);
        padding: 0.75rem 1.25rem;
        border-radius: 9999px;
        font-weight: 700;
        font-size: 0.9rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
        z-index: 1000;
        transform: translateY(100px);
        opacity: 0;
        transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        pointer-events: none;
    }

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

    /* Theme Overrides & Accessibility */
    [data-theme="dark"] .math-index-hero {
        background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(14, 165, 233, 0.08) 50%, rgba(99, 102, 241, 0.12) 100%);
    }

    [data-theme="midnight"] .math-index-hero {
        background: linear-gradient(135deg, rgba(30, 41, 59, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%);
        border-color: rgba(99, 102, 241, 0.3);
    }

    /* High Contrast Focus Visibility */
    .math-pill-btn:focus-visible,
    .math-action-btn:focus-visible,
    .math-codex-link:focus-visible,
    .math-index-search-input:focus-visible {
        outline: 3px solid var(--color-primary);
        outline-offset: 2px;
    }

    /* Print Optimization for Study Cheatsheet */
    @media print {
        .math-index-hero,
        .math-filter-panel,
        .math-status-bar,
        .math-term-actions,
        .header-main,
        .footer-main,
        .breadcrumb-nav {
            display: none !important;
        }

        .math-index-page {
            max-width: 100% !important;
            padding: 0 !important;
        }

        .math-cards-grid {
            display: block !important;
        }

        .math-term-card {
            page-break-inside: avoid;
            margin-bottom: 1.5rem;
            border: 1px solid #000000 !important;
            box-shadow: none !important;
        }
    }
}