:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary: #0ea5e9;
    --bg-main: #f8f9fa;
    --bg-white: #ffffff;
    --bg-light: #f1f3f5;
    --bg-card: #ffffff;
    --bg-dark: #f8fafc;
    --text-dark: #1a202c;
    --text-main: #1a202c;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --success: #10b981;
    --error: #ef4444;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Utility classes for themed sections */
.section-light {
    background: var(--bg-white);
}

.section-alt {
    background: var(--bg-light);
}

/* Dark Mode */
[data-theme="dark"] {
    --primary: #60a5fa;
    --primary-dark: #3b82f6;
    --primary-light: #93c5fd;
    --secondary: #38bdf8;
    --bg-main: #0f172a;
    --bg-white: #1e293b;
    --bg-light: #334155;
    --bg-card: #1e293b;
    --bg-dark: #0f172a;
    --text-dark: #f1f5f9;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #34d399;
    --error: #f87171;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 0 3px rgba(96, 165, 250, 0.2);
}

[data-theme="dark"] body {
    background: var(--bg-main);
    color: var(--text-main);
}

/* Dark mode for utility section classes */
[data-theme="dark"] .section-light {
    background: var(--bg-card) !important;
}

[data-theme="dark"] .section-alt {
    background: var(--bg-main) !important;
}

[data-theme="dark"] .bg-white {
    background-color: var(--bg-card) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .bg-light {
    background-color: var(--bg-light) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}

[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3,
[data-theme="dark"] h4,
[data-theme="dark"] h5,
[data-theme="dark"] h6,
[data-theme="dark"] .h1,
[data-theme="dark"] .h2,
[data-theme="dark"] .h3,
[data-theme="dark"] .h4,
[data-theme="dark"] .h5,
[data-theme="dark"] .h6 {
    color: var(--text-dark);
}

[data-theme="dark"] .site-header {
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom-color: var(--border);
}

[data-theme="dark"] .breadcrumb {
    background: rgba(30, 41, 59, 0.9) !important;
    border-color: var(--border);
}

[data-theme="dark"] .card,
[data-theme="dark"] .admin-card,
[data-theme="dark"] .profile-card,
[data-theme="dark"] .auth-card {
    background: var(--bg-card);
    border-color: var(--border);
    color: var(--text-main);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea,
[data-theme="dark"] .form-control {
    background: var(--bg-light);
    color: var(--text-main);
    border-color: var(--border);
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] .form-control::placeholder {
    color: var(--text-muted);
}

[data-theme="dark"] table {
    color: var(--text-main);
}

[data-theme="dark"] th,
[data-theme="dark"] .table th {
    background-color: var(--bg-card) !important;
    color: var(--text-dark) !important;
    border-color: var(--border) !important;
}

[data-theme="dark"] td,
[data-theme="dark"] .table td {
    border-color: var(--border);
    color: var(--text-main);
}

[data-theme="dark"] .btn-outline {
    border-color: var(--border);
    color: var(--text-main);
}

[data-theme="dark"] .tool-btn {
    background: var(--primary);
    box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
    color: white;
}

[data-theme="dark"] .tool-btn:hover {
    box-shadow: 0 6px 20px rgba(96, 165, 250, 0.4);
    background: var(--primary-light);
}

[data-theme="dark"] .tool-btn.kf-btn {
    background: var(--success);
    box-shadow: 0 4px 12px rgba(52, 211, 153, 0.3);
}

[data-theme="dark"] .tool-btn.kf-btn:hover {
    box-shadow: 0 6px 20px rgba(52, 211, 153, 0.4);
}

[data-theme="dark"] footer {
    background: var(--bg-card);
}

/* Dark mode for homepage sections */
[data-theme="dark"] .hero {
    background: radial-gradient(circle at top right, rgba(96, 165, 250, 0.12), transparent 40%),
        radial-gradient(circle at bottom left, rgba(56, 189, 248, 0.12), transparent 40%),
        var(--bg-main);
}

[data-theme="dark"] .hero h1 {
    background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-theme="dark"] .hero p {
    color: var(--text-muted);
}

[data-theme="dark"] .features {
    background: var(--bg-main);
}

[data-theme="dark"] .feature-card {
    background: var(--bg-card);
    /* border-color: var(--border); */
}

[data-theme="dark"] .feature-card h3 {
    color: var(--text-main);
}

[data-theme="dark"] .feature-card p {
    color: var(--text-muted);
}

[data-theme="dark"] .section-title {
    color: var(--text-main);
}

[data-theme="dark"] .section-subtitle {
    color: var(--text-muted);
}

[data-theme="dark"] main {
    background: var(--bg-main);
}

/* Dark mode for stats and other sections with inline styles */
[data-theme="dark"] .stats-counter,
[data-theme="dark"] section[style*="background: white"],
[data-theme="dark"] section[style*="background: #fff"],
[data-theme="dark"] section[style*="background:#fff"] {
    background: var(--bg-main) !important;
}

[data-theme="dark"] .gradient-text {
    background: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

[data-theme="dark"] .btn-secondary-outline {
    background: var(--bg-card);
    color: var(--text-main);
    border-color: var(--border);
}

[data-theme="dark"] .btn-secondary-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--bg-light);
}

/* Dark mode for nav links */
[data-theme="dark"] .nav-link {
    color: var(--text-main);
}

[data-theme="dark"] .nav-link:hover {
    color: var(--primary);
}

[data-theme="dark"] .logo {
    color: var(--primary);
}

/* Dark mode for theme toggle */
[data-theme="dark"] .theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

[data-theme="dark"] .theme-toggle:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

/* Breadcrumb Styles */
.breadcrumb {
    background: var(--bg-white);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    margin-bottom: 2rem;
    font-size: 0.9rem;
    border: 1px solid var(--border);
}

.breadcrumb-item a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
    font-weight: 500;
}

.breadcrumb-item a:hover {
    color: var(--primary);
}

.breadcrumb-item.active {
    color: var(--text-dark);
    font-weight: 600;
}

.breadcrumb-item+.breadcrumb-item::before {
    content: "›";
    font-family: inherit;
    color: var(--text-muted);
    opacity: 0.5;
    padding: 0 0.75rem;
}

[data-theme="dark"] .breadcrumb {
    background: var(--bg-card);
    border-color: var(--border);
}

[data-theme="dark"] .breadcrumb-item a {
    color: var(--text-muted);
}

[data-theme="dark"] .breadcrumb-item a:hover {
    color: var(--primary);
}

[data-theme="dark"] .breadcrumb-item.active {
    color: var(--text-main);
}