/* Theme System Architecture with CSS Custom Properties */

:root {
    /* Corporate Blue Theme (Default) */
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --background-color: #ffffff;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --card-background: #ffffff;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --gradient-start: #2563eb;
    --gradient-end: #1e40af;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

[data-theme="modern-dark"] {
    --primary-color: #8b5cf6;
    --secondary-color: #7c3aed;
    --accent-color: #a78bfa;
    --background-color: #0f172a;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --card-background: #1e293b;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --gradient-start: #8b5cf6;
    --gradient-end: #7c3aed;
}

[data-theme="elegant-light"] {
    --primary-color: #059669;
    --secondary-color: #047857;
    --accent-color: #10b981;
    --background-color: #fafaf9;
    --text-color: #1c1917;
    --text-muted: #78716c;
    --border-color: #e7e5e4;
    --card-background: #ffffff;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
    --gradient-start: #059669;
    --gradient-end: #047857;
}

[data-theme="professional-green"] {
    --primary-color: #059669;
    --secondary-color: #047857;
    --accent-color: #10b981;
    --background-color: #ffffff;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --card-background: #ffffff;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --gradient-start: #059669;
    --gradient-end: #047857;
}

/* Theme transition */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}