/**
 * PUMKIN.DEV Academic Design System - Base Stylesheet
 * Layer: 1 - Base (Tokens, Reset, Typography, Math Primitives, Base Tables)
 */

        :root {
            /* Hand-crafted Academic Design System (Pumkin Slate & Terracotta) */
            --color-bg: #f8f9fa;
            --color-surface: #ffffff;
            --color-surface-subtle: #f1f3f5;
            --color-text: #1a202c;
            --color-text-muted: #64748b;
            --color-text-inverse: #ffffff;
            --color-border: #e2e8f0;
            --color-border-strong: #cbd5e1;
            
            /* Signature Academic Brand Colors */
            --color-primary: #0f172a;       /* Oxford Navy Slate */
            --color-primary-hover: #1e293b;
            --color-primary-light: #334155;
            --color-primary-bg: #f1f5f9;
            --color-accent: #ea580c;        /* Warm Pumkin Terracotta */
            --color-accent-hover: #c2410c;
            --color-accent-bg: #fff7ed;
            
            /* Status & Feedback Tones */
            --color-success: #0f766e;       /* Deep Forest Emerald */
            --color-success-bg: #f0fdf4;
            --color-warning: #b45309;       /* Scholarly Amber */
            --color-warning-bg: #fffbeb;
            --color-danger: #b91c1c;        /* Crimson */
            --color-danger-bg: #fef2f2;

            /* Backward compatibility aliases */
            --primary: var(--color-primary);
            --primary-light: var(--color-primary-light);
            --primary-bg: var(--color-primary-bg);
            --accent: var(--color-accent);
            --success: var(--color-success);
            --success-bg: var(--color-success-bg);
            --warning: var(--color-warning);
            --warning-bg: var(--color-warning-bg);
            --danger: var(--color-danger);
            --danger-bg: var(--color-danger-bg);
            --text-main: var(--color-text);
            --text-muted: var(--color-text-muted);
            --border-color: var(--color-border);
            --card-bg: var(--color-surface);
            --bg-card: var(--card-bg);
            --card-bg-subtle: var(--color-surface-subtle);
            --code-bg: #f8fafc;
            --bg-color: var(--color-bg);
            --text-color: var(--color-text);

            /* Refined Natural Diffuse Elevation */
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 25px -4px rgba(0, 0, 0, 0.08);

            /* Inputs & Forms */
            --input-bg: #ffffff;
            --input-border: #cbd5e1;
            --input-focus-ring: rgba(15, 23, 42, 0.12);

            /* Navigation & Overlays */
            --nav-bg: rgba(255, 255, 255, 0.94);
            --nav-border: #e2e8f0;
            --modal-overlay: rgba(15, 23, 42, 0.6);
            --scrollbar-thumb: #cbd5e1;
            --scrollbar-track: transparent;
            --icon-muted: #94a3b8;
            /* Utility & Scrollbar Dimensions (Consolidated) */
            --scrollbar-size: 11px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html, body {
            max-width: 100%;
            overflow-x: hidden;
            position: relative;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Inter", "Plus Jakarta Sans", "Segoe UI", Roboto, sans-serif;
            line-height: 1.68;
            color: var(--text-main);
            background-color: var(--bg-color);
            padding: 0 0 50px 0;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .wrapper, main, .app-view {
            max-width: 100%;
            box-sizing: border-box;
        }

        .katex-display {
            max-width: 100%;
            overflow-x: auto;
            overflow-y: hidden;
            -webkit-overflow-scrolling: touch;
            padding: 4px 0;
        }

        .wrapper {
            max-width: 1140px;
            margin: 28px auto 0 auto;
            background: var(--card-bg);
            padding: 40px 48px;
            border-radius: 14px;
            border: 1px solid var(--border-color);
            box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.04), 0 4px 16px -2px rgba(0, 0, 0, 0.02);
            transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
        }

        header:not(.pumkin-nav-container) {
            text-align: center;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 28px;
            margin-bottom: 32px;
        }

        h1 {
            font-size: 24px;
            color: var(--text-main);
            font-weight: 750;
            letter-spacing: -0.4px;
            margin-bottom: 10px;
            line-height: 1.35;
        }

        .header-sub {
            font-size: 15px;
            color: var(--accent);
            font-weight: 500;
            margin-bottom: 12px;
        }

        .target-badge {
    display: inline-block;
    background: var(--color-surface-subtle);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    padding: 5px 14px;
    border-radius: 6px;
    font-size: 12.5px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

        h2 {
            font-size: 20px;
            color: var(--primary);
            margin-top: 40px;
            margin-bottom: 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid #cbd5e1;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        h3 {
            font-size: 16.5px;
            color: var(--accent);
            margin-top: 24px;
            margin-bottom: 10px;
        }

        h4 {
            font-size: 14.5px;
            color: var(--text-main);
            margin-top: 15px;
            margin-bottom: 6px;
        }

        p {
            margin-bottom: 10px;
            font-size: 14.5px;
            color: var(--text-main);
        }

        .highlight-keyword {
            font-weight: 700;
            color: var(--primary);
        }

        /* Callout Box */
        .callout {
            background-color: var(--primary-bg);
            border-left: 4px solid var(--primary);
            padding: 14px 18px;
            border-radius: 6px;
            margin: 16px 0;
            font-size: 14px;
        }

        .callout-title {
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
            text-transform: uppercase;
            font-size: 13px;
            letter-spacing: 0.5px;
        }

        /* Formula Card */
        .formula-card {
            background-color: #fdfdfd;
            border: 1px solid #e2e8f0;
            border-left: 4px solid var(--primary-light);
            border-radius: 8px;
            padding: 16px 20px;
            margin: 16px 0;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }

        .formula-card-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .formula-condition {
            font-size: 13px;
            color: var(--text-muted);
            background: var(--bg-subtle, #f1f5f9);
            display: inline-block;
            padding: 2px 8px;
            border-radius: 4px;
            margin-bottom: 10px;
            font-style: italic;
        }

        .formula-display {
            background: var(--code-bg, #ffffff);
            border: 1px solid var(--border-color);
            padding: 12px;
            border-radius: 6px;
            margin: 8px 0;
            text-align: center;
            font-size: 15px;
            overflow-x: auto;
        }

        .formula-note {
            font-size: 13px;
            color: var(--text-muted, #475569);
            margin-top: 6px;
        }

        /* Responsive Table Container System */
        .table-responsive {
            width: 100%;
            max-width: 100%;
            overflow-x: auto;
            overflow-y: hidden;
            -webkit-overflow-scrolling: touch;
            margin: 18px 0;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            background: var(--card-bg, #ffffff);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
            position: relative;
            box-sizing: border-box;
        }

        .table-responsive::-webkit-scrollbar {
            height: 6px;
        }

        .table-responsive::-webkit-scrollbar-track {
            background: var(--bg-subtle, #f1f5f9);
            border-radius: 4px;
        }

        .table-responsive::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 4px;
        }

        /* Tables inside responsive wrapper */
        .table-responsive table {
            margin: 0 !important;
            border: none !important;
            border-radius: 0 !important;
            min-width: 580px;
        }

        /* Base Tables */
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 18px 0;
            font-size: 13.5px;
            background: var(--card-bg, white);
            border-radius: 8px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        th {
            background-color: var(--primary);
            color: white;
            padding: 10px 14px;
            font-weight: 600;
            text-align: left;
            border: 1px solid var(--border-color);
        }

        td {
            padding: 10px 14px;
            border: 1px solid var(--border-color);
            vertical-align: middle;
            background: var(--card-bg, transparent);
            color: var(--text-main);
        }

        tr:nth-child(even) td {
            background-color: var(--bg-subtle, #f8fafc);
        }

        tr:hover td {
            background-color: var(--primary-bg, #f1f5f9);
        }

        .badge-winner {
            display: inline-block;
            background-color: var(--success);
            color: white;
            font-size: 11px;
            font-weight: 700;
            padding: 2px 7px;
            border-radius: 12px;
            text-transform: uppercase;
        }

        .badge-thpt {
            display: inline-block;
            background-color: #2563eb;
            color: white;
            font-size: 11px;
            font-weight: 700;
            padding: 2px 7px;
            border-radius: 12px;
            text-transform: uppercase;
        }

        /* Examples Box */
        .example-box {
            background: var(--card-bg, #ffffff);
            border: 1px solid var(--border-color, #cbd5e1);
            border-left: 4px solid var(--success);
            border-radius: 8px;
            padding: 18px 22px;
            margin: 20px 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.04);
        }

        .example-header {
            font-size: 14.5px;
            font-weight: 700;
            color: var(--success);
            margin-bottom: 10px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .example-problem {
            font-size: 14px;
            color: var(--text-main);
            margin-bottom: 12px;
            background: var(--code-bg, #f8fafc);
            padding: 12px 14px;
            border-radius: 6px;
            border: 1px solid var(--border-color, #e2e8f0);
        }

        .solution-step {
            margin-bottom: 8px;
            font-size: 13.5px;
        }

        .solution-step-title {
            font-weight: 600;
            color: var(--primary);
        }

        .solution-result {
            background: var(--success-bg);
            border: 1px solid #a7f3d0;
            color: #065f46;
            padding: 8px 14px;
            border-radius: 6px;
            font-weight: 600;
            margin-top: 10px;
            font-size: 13.5px;
        }

        .casio-shortcut {
            font-family: 'Courier New', Courier, monospace;
            background: #e2e8f0;
            padding: 2px 5px;
            border-radius: 4px;
            font-weight: 600;
            font-size: 12.5px;
        }

        @media (max-width: 768px) {
            .wrapper {
                padding: 20px 15px;
            }
            table {
                font-size: 12px;
            }
            th, td {
                padding: 6px 8px;
            }
        }


/* ==========================================================================
   PUMKIN.DEV PLATFORM EXTENSIONS - DESIGN SYSTEM & COMPONENTS
   ========================================================================== */