@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Montserrat:wght@500;600;700;800&family=IBM+Plex+Serif:wght@400;600&display=swap');

:root {
    /* Light Mode (Default) */
    --bg: #F8F9FB;
    --surface: #FFFFFF;
    --surface-elevated: #FFFFFF;
    --text: #1F2937;
    --text-secondary: #6B7280;
    --muted: #9CA3AF;
    --border: #E5E7EB;
    --border-hover: #D1D5DB;
    --primary: #6366F1;
    --primary-hover: #4F46E5;
    --primary-light: #EEF2FF;
    --secondary: #F3F4F6;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 16px;
    --sidebar-width: 260px;
    --header-height: 70px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg: #0F1115;
    --surface: #181B21;
    --surface-elevated: #22262E;
    --text: #F9FAFB;
    --text-secondary: #D1D5DB;
    --muted: #9CA3AF;
    --border: #2D3139;
    --border-hover: #3E434D;
    --primary: #818CF8;
    --primary-hover: #6366F1;
    --primary-light: rgba(99, 102, 241, 0.15);
    --secondary: #2D3139;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    line-height: 1.5;
    min-height: 100vh;
    transition: var(--transition);
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    color: var(--text);
    font-weight: 700;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    z-index: 50;
    transition: var(--transition);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 40px;
    padding: 0 12px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary), #EC4899);
    border-radius: 8px;
    display: grid;
    place-items: center;
    color: white;
    font-size: 18px;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

.nav-item a:hover {
    background: var(--secondary);
    color: var(--text);
}

.nav-item a.active {
    background: var(--primary-light);
    color: var(--primary);
}

.nav-icon {
    width: 20px;
    height: 20px;
    opacity: 0.8;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 32px;
    max-width: 1600px;
    margin-right: auto;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 32px;
}

.page-title {
    font-size: 28px;
    margin-bottom: 8px;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Cards */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow);
    border-color: var(--border-hover);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-label {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--muted);
}

.stat-value {
    font-family: 'Montserrat', sans-serif;
    font-size: 32px;
    font-weight: 700;
    color: var(--text);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-secondary:hover {
    background: var(--secondary);
    border-color: var(--border-hover);
}

/* Inputs */
input, select, textarea {
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    outline: none;
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
    background: var(--surface);
}

/* Lists */
.list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.list-item:last-child {
    border-bottom: none;
}

.list-item:hover {
    background: var(--secondary);
}

/* Badges */
.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.badge-neutral { background: var(--secondary); color: var(--text-secondary); }

/* Theme Toggle */
.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    display: grid;
    place-items: center;
    cursor: pointer;
    color: var(--text);
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--secondary);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    place-items: center;
    z-index: 100;
    opacity: 0;
    transition: var(--transition);
}

.modal.active {
    display: grid;
    opacity: 1;
}

.modal-content {
    background: var(--surface-elevated);
    width: 90%;
    max-width: 600px;
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: var(--transition);
}

.modal.active .modal-content {
    transform: scale(1);
}

/* Utility */
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.mb-4 { margin-bottom: 16px; }
.mt-4 { margin-top: 16px; }
.text-sm { font-size: 14px; }
.text-muted { color: var(--text-secondary); }
.w-full { width: 100%; }

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .main-content {
        margin-left: 0;
        padding: 20px;
    }
    .sidebar.active {
        transform: translateX(0);
    }
}