:root {
    --primary: #6366f1;
    --secondary: #8b5cf6;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --dark: #1f2937;
    --light: #f3f4f6;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 1rem 2rem;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 80px auto 0;
    padding: 2rem;
}

/* Cards */
.card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px rgba(0,0,0,0.15);
}

.card-header {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--light);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--light);
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

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

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

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

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--light);
}

th {
    background: var(--light);
    font-weight: 600;
    color: var(--dark);
}

tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

/* Dashboard Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: #6b7280;
    font-size: 0.875rem;
}

/* Alert Messages */
.alert {
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background: #fed7aa;
    color: #92400e;
    border: 1px solid #fde68a;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    width: 100%;
    max-width: 450px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--light);
}

.tab {
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border: none;
    background: none;
    font-size: 1rem;
    font-weight: 500;
    color: #6b7280;
    transition: all 0.3s;
}

.tab.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
    margin-bottom: -2px;
}

/* Plan Cards */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.plan-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.plan-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.plan-card.popular::before {
    content: "POPULAR";
    position: absolute;
    top: 20px;
    right: -30px;
    background: var(--warning);
    color: white;
    padding: 5px 30px;
    transform: rotate(45deg);
    font-size: 0.75rem;
    font-weight: bold;
}

.plan-price {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary);
    margin: 1rem 0;
}

.plan-price span {
    font-size: 1rem;
    color: #6b7280;
}

.plan-features {
    list-style: none;
    margin: 1.5rem 0;
}

.plan-features li {
    padding: 0.5rem 0;
    color: #6b7280;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .container {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .plans-grid {
        grid-template-columns: 1fr;
    }
}