/* ===== Theme Variables - Certificate System ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    /* Primary Colors - Professional Blue */
    --primary: #1e40af;
    --primary-dark: #1e3a8a;
    --primary-light: #3b82f6;
    --primary-lighter: #60a5fa;
    /* Secondary Colors - Elegant Gray */
    --secondary: #475569;
    --secondary-dark: #334155;
    --secondary-light: #64748b;
    /* Accent Colors - Subtle & Professional */
    --accent: #0ea5e9;
    --accent-dark: #0284c7;
    --accent-light: #38bdf8;
    /* Success - Minimal Green */
    --success: #059669;
    --success-dark: #047857;
    --success-light: #10b981;
    /* Warning - Subtle Amber */
    --warning: #d97706;
    --warning-dark: #b45309;
    --warning-light: #f59e0b;
    /* Danger - Professional Red */
    --danger: #dc2626;
    --danger-dark: #b91c1c;
    --danger-light: #ef4444;
    /* Info - Sky Blue */
    --info: #0284c7;
    --info-dark: #075985;
    --info-light: #0ea5e9;
    /* Neutral Colors - Light Theme */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-gradient-start: #f8fafc;
    --bg-gradient-end: #e0e7ff;
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-muted: #94a3b8;
    /* Border Colors */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --border-dark: #94a3b8;
    /* Shadow System */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    /* Focus Ring */
    --focus-ring: 0 0 0 3px rgba(30, 64, 175, 0.1);
    --focus-ring-offset: 2px;
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-full: 9999px;
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    /* Z-index Scale */
    --z-base: 1;
    --z-dropdown: 10;
    --z-sticky: 20;
    --z-fixed: 30;
    --z-modal-backdrop: 40;
    --z-modal: 50;
    --z-popover: 60;
    --z-tooltip: 70;
    /* Font Family */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;
    /* Letter Spacing */
    --tracking-tighter: -0.05em;
    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
}

/* Global Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: var(--leading-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Selection */
::selection {
    background-color: rgba(30, 64, 175, 0.2);
    color: var(--text-primary);
}

/* Focus Visible */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: var(--focus-ring-offset);
}

/* Scrollbar - Light Theme */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-full);
}

    ::-webkit-scrollbar-thumb:hover {
        background: var(--gray-400);
    }