:root {
    --primary: #FF3333;
    --primary-hover: #CC0000;
    --dark-bg: #121212;
    --card-bg: #1E1E1E;
    --text-white: #FFFFFF;
    --text-gray: #B0B0B0;
    --border: #333333;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-white);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background: var(--primary);
    color: #fff;
    border-radius: 5px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    text-align: center;
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
}

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

.btn-block {
    display: block;
    width: 100%;
}

/* Header */
header {
    background: rgba(18, 18, 18, 0.95);
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .nav-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 1px;
}

.nav-links a {
    margin-left: 20px;
    color: var(--text-gray);
    font-size: 15px;
}

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

/* Forms */
.auth-box {
    max-width: 400px;
    margin: 80px auto;
    background: var(--card-bg);
    padding: 40px;
    border-radius: 10px;
    border: 1px solid var(--border);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-gray);
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px;
    background: #2A2A2A;
    border: 1px solid var(--border);
    border-radius: 5px;
    color: #fff;
    font-size: 16px;
}

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

/* Dashboard */
.d-flex {
    display: flex;
}

.sidebar {
    width: 250px;
    background: var(--card-bg);
    min-height: calc(100vh - 80px);
    padding: 20px;
    border-right: 1px solid var(--border);
}

.sidebar a {
    display: block;
    padding: 12px;
    color: var(--text-gray);
    margin-bottom: 5px;
    border-radius: 5px;
}

.sidebar a:hover,
.sidebar a.active {
    background: var(--primary);
    color: #fff;
}

.main-content {
    flex: 1;
    padding: 40px;
}

.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border);
    margin-bottom: 20px;
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    color: var(--text-gray);
    font-weight: 500;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mt-4 {
    margin-top: 2rem;
}

.text-danger {
    color: #ff4d4f;
}

.text-success {
    color: #52c41a;
}

@media (max-width: 768px) {
    .d-flex {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        min-height: auto;
    }
}