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

:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-secondary: #0ea5e9;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --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;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --header-height: 64px;
}

/* Dark mode — toggled via html.dark class (unified header) */
html.dark {
    --color-primary: #6366f1;
    --color-primary-dark: #818cf8;
    --color-secondary: #38bdf8;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-danger: #f87171;
    --color-gray-50: #0f172a;
    --color-gray-100: #1e293b;
    --color-gray-200: #334155;
    --color-gray-300: #475569;
    --color-gray-400: #64748b;
    --color-gray-500: #94a3b8;
    --color-gray-600: #cbd5e1;
    --color-gray-700: #e2e8f0;
    --color-gray-800: #f1f5f9;
    --color-gray-900: #f8fafc;
}

html {
    font-size: 16px;
    line-height: 1.5;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-gray-50);
    color: var(--color-gray-900);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    background: white;
    border-bottom: 1px solid var(--color-gray-200);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
}

.app-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--color-gray-900);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 8px;
    color: white;
}

.logo-text {
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: 0.05em;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    color: var(--color-gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: 6px;
    transition: all 0.15s ease;
}

.nav-link:hover {
    color: var(--color-gray-900);
    background: var(--color-gray-100);
}

.nav-link.active {
    color: var(--color-primary);
    background: rgba(79, 70, 229, 0.1);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-menu-trigger {
    display: flex;
    align-items: center;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 240px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--color-gray-200);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
}

.user-menu-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-info {
    padding: 1rem;
}

.user-name {
    display: block;
    font-weight: 600;
    color: var(--color-gray-900);
}

.user-email {
    display: block;
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

.menu-divider {
    height: 1px;
    background: var(--color-gray-200);
}

.menu-item {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    text-align: left;
    font-size: 0.875rem;
    color: var(--color-gray-700);
    text-decoration: none;
    background: none;
    border: none;
    cursor: pointer;
    transition: background 0.15s ease;
}

.menu-item:hover {
    background: var(--color-gray-50);
}

.menu-item-danger {
    color: var(--color-danger);
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    width: 100%;
}

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: #047857;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: #b91c1c;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-ghost {
    background: transparent;
    color: var(--color-gray-700);
}

.btn-ghost:hover {
    background: var(--color-gray-100);
}

/* Footer */
.app-footer {
    background: white;
    border-top: 1px solid var(--color-gray-200);
    padding: 1.5rem;
    text-align: center;
}

.app-footer p {
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Landing Page */
.landing-hero {
    text-align: center;
    padding: 4rem 1rem;
}

.landing-hero h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.landing-hero .subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.feature-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--color-gray-200);
    transition: all 0.2s ease;
}

.feature-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.1);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    border: 1px solid var(--color-gray-200);
    padding: 1.5rem;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
}

/* Status badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 9999px;
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: #047857;
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: #b45309;
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #b91c1c;
}

.badge-info {
    background: rgba(14, 165, 233, 0.1);
    color: #0369a1;
}