/* ============================================
   CSS Custom Properties (Theming)
   ============================================ */
:root {
	/* Brand colors */
	--color-primary: #10b981;
	--color-primary-hover: #059669;
	--color-primary-light: rgba(16, 185, 129, 0.1);
	--color-primary-border: rgba(16, 185, 129, 0.3);

	/* Neutral colors */
	--color-white: #ffffff;
	--color-gray-50: #f9fafb;
	--color-gray-100: #f3f4f6;
	--color-gray-200: #e5e7eb;
	--color-gray-300: #d1d5db;
	--color-gray-400: #9ca3af;
	--color-gray-500: #6b7280;
	--color-gray-600: #4b5563;
	--color-gray-700: #374151;
	--color-gray-800: #1f2937;
	--color-gray-900: #111827;

	/* Semantic colors */
	--color-error: #dc2626;
	--color-error-light: #fef2f2;
	--color-error-border: #fecaca;
	--color-success: #16a34a;
	--color-success-light: #f0fdf4;
	--color-warning: #d97706;
	--color-warning-light: #fffbeb;

	/* Sidebar */
	--sidebar-width: 260px;
	--sidebar-bg: var(--color-white);
	--sidebar-border: var(--color-gray-200);
	--sidebar-text: var(--color-gray-700);
	--sidebar-text-muted: var(--color-gray-500);
	--sidebar-hover-bg: var(--color-gray-50);
	--sidebar-active-bg: var(--color-primary-light);
	--sidebar-active-text: var(--color-primary);

	/* Layout */
	--header-height: 64px;
	--topbar-height: 56px;
	--mobile-tab-height: 64px;
	--content-max-width: 1200px;
	--border-radius: 8px;
	--border-radius-md: 8px;
	--border-radius-lg: 12px;

	/* Shadows */
	--shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
	--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
	--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

	/* Transitions */
	--transition-fast: 150ms ease;
	--transition-normal: 200ms ease;

	/* Text colors */
	--text-primary: var(--color-gray-900);
	--text-secondary: var(--color-gray-600);
	--text-tertiary: var(--color-gray-500);

	/* Background colors */
	--bg-primary: var(--color-white);
	--bg-secondary: var(--color-gray-50);
	--bg-tertiary: var(--color-gray-100);

	/* Border colors */
	--border-primary: var(--color-gray-200);
	--border-secondary: var(--color-gray-300);

	/* Accent (alias for primary, used in some templates) */
	--accent-color: var(--color-primary);
	--accent-color-light: var(--color-primary-light);
}

/* Dark sidebar variant (for future use) */
[data-theme="dark-sidebar"] {
	--sidebar-bg: var(--color-gray-900);
	--sidebar-border: var(--color-gray-700);
	--sidebar-text: var(--color-gray-100);
	--sidebar-text-muted: var(--color-gray-400);
	--sidebar-hover-bg: var(--color-gray-800);
	--sidebar-active-bg: rgba(16, 185, 129, 0.2);
	--sidebar-active-text: #34d399;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*,
*::before,
*::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

html {
	font-size: 16px;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

body {
	font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
	font-size: 1rem;
	line-height: 1.5;
	color: var(--color-gray-900);
	background: var(--color-gray-50);
}

a {
	color: var(--color-primary);
	text-decoration: none;
}

a:hover {
	text-decoration: underline;
}

/* Prevent body scroll when sidebar is open on mobile */
body.sidebar-open {
	overflow: hidden;
}

/* ============================================
   Layout Structure
   ============================================ */
.app-layout {
	display: flex;
	min-height: 100vh;
}

.app-main {
	flex: 1;
	margin-left: var(--sidebar-width);
	display: flex;
	flex-direction: column;
	min-height: 100vh;
	transition: margin-left var(--transition-normal);
}

.app-content {
	flex: 1;
	padding: 32px;
	width: 100%;
	max-width: var(--content-max-width);
	margin: 0 auto;
}

/* ============================================
   Page Header
   ============================================ */
.page-header {
	margin-bottom: 32px;
}

.page-header-row {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	flex-wrap: wrap;
}

.page-title {
	font-size: 28px;
	font-weight: 700;
	color: var(--color-gray-900);
}

.page-subtitle {
	font-size: 16px;
	color: var(--color-gray-500);
	margin-top: 4px;
}

.page-actions {
	display: flex;
	gap: 12px;
}

/* ============================================
   Auth Pages
   ============================================ */
.auth-page {
	min-height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 24px;
	background: var(--color-gray-50);
}

.auth-card {
	width: 100%;
	max-width: 400px;
	background: var(--color-white);
	border-radius: 12px;
	padding: 32px;
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.auth-header {
	text-align: center;
	margin-bottom: 24px;
}

.auth-title {
	font-size: 24px;
	font-weight: 600;
	margin: 0 0 8px 0;
}

.auth-subtitle {
	font-size: 14px;
	color: var(--color-gray-500);
	margin: 0;
}

.auth-form .form-group {
	margin-bottom: 20px;
}

.auth-form .btn-block {
	width: 100%;
	margin-top: 8px;
}

/* ============================================
   Error Pages (404, 500)
   ============================================ */
.error-page {
	display: flex;
	align-items: center;
	justify-content: center;
	min-height: calc(100vh - 200px);
	padding: 40px 24px;
}

.error-content {
	text-align: center;
	max-width: 480px;
}

.error-icon {
	font-size: 64px;
	margin-bottom: 16px;
	opacity: 0.6;
	animation: error-float 3s ease-in-out infinite;
}

@keyframes error-float {
	0%, 100% { transform: translateY(0); }
	50% { transform: translateY(-10px); }
}

.error-code {
	font-size: 120px;
	font-weight: 800;
	color: var(--accent-color);
	line-height: 1;
	margin: 0 0 8px 0;
	letter-spacing: -4px;
}

.error-title {
	font-size: 24px;
	font-weight: 600;
	color: var(--text-primary);
	margin: 0 0 16px 0;
}

.error-message {
	font-size: 16px;
	color: var(--text-secondary);
	line-height: 1.6;
	margin: 0 0 32px 0;
}

.error-actions {
	display: flex;
	gap: 12px;
	justify-content: center;
	flex-wrap: wrap;
}

/* ============================================
   Responsive Breakpoints (Layout)
   ============================================ */
@media (max-width: 1024px) {
	.app-main {
		margin-left: 0;
		padding-top: var(--topbar-height);
	}
}

@media (max-width: 768px) {
	.app-main {
		padding-bottom: var(--mobile-tab-height);
	}

	.app-content {
		padding: 20px 16px;
	}

	.page-title {
		font-size: 24px;
	}
}

@media (max-width: 480px) {
	.page-header-row {
		flex-direction: column;
		align-items: flex-start;
	}

	.page-actions {
		width: 100%;
	}

	.page-actions .btn {
		flex: 1;
	}

	.error-code {
		font-size: 80px;
		letter-spacing: -2px;
	}

	.error-title {
		font-size: 20px;
	}

	.error-actions {
		flex-direction: column;
	}

	.error-actions .btn {
		width: 100%;
		justify-content: center;
	}
}