:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --sidebar-color: #1e293b;
    --sidebar-text: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-color);
    color: var(--sidebar-text);
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
}

.sidebar h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    padding: 0 1rem;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: 0.5rem;
}

.nav-links a {
    color: #94a3b8;
    text-decoration: none;
    padding: 0.75rem 1rem;
    display: block;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 2rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border: 1px solid var(--border-color);
}

.stat-card .label {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.stat-card .value {
    font-size: 1.875rem;
    font-weight: 700;
}

/* Tables */
.table-container {
    background: var(--card-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    background: #f1f5f9;
    padding: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
}

td {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
}

.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-pro { background: #dbeafe; color: #1e40af; }
.badge-free { background: #f1f5f9; color: #475569; }
.badge-enterprise { background: #fef3c7; color: #92400e; }

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: background 0.2s;
}

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

.btn-outline { background: transparent; border: 1px solid var(--border-color); color: var(--text-main); }
.btn-outline:hover { background: #f8fafc; }

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

input, select, textarea {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    outline: none;
    background: #fff;
}

textarea {
    min-height: 150px;
    resize: vertical;
    line-height: 1.5;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}