:root {
    --primary-color: #1a73e8;
    --secondary-color: #34a853;
    --danger-color: #ea4335;
    --text-color: #202124;
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --bg-color: #ffffff;
    --bg-secondary: #f8f9fa;
    --shadow: 0 1px 3px rgba(0,0,0,0.12);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-color);
    line-height: 1.6;
}

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    padding: 40px;
    max-width: 450px;
    width: 100%;
}

.logo-section {
    text-align: center;
    margin-bottom: 40px;
}

.logo-section h1 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    margin-bottom: -2px;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="tel"],
.form-group input[type="url"],
.form-group input[type="file"],
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: #1557b0;
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-error {
    background: #fce8e6;
    color: var(--danger-color);
}

.alert-success {
    background: #e6f4ea;
    color: var(--secondary-color);
}

header {
    background: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 50px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    display: flex;
    gap: 20px;
    align-items: center;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 25px;
}

.card-item {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-section {
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    .cards-grid {
        grid-template-columns: 1fr;
    }
}

.card-actions {
    display: flex;
    gap: 10px;
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
    flex-wrap: wrap;
}

.card-actions .btn {
    flex: 1;
    min-width: 100px;
    font-size: 13px;
    padding: 8px 12px;
}

@media (max-width: 768px) {
    .card-actions {
        flex-direction: column;
    }
    
    .card-actions .btn {
        width: 100%;
    }
}