/* ===== BASE STYLES ===== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #fafafa 0%, #d4d7e2 100%) !important;

    margin: 0;
    padding: 20px;
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1900px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* ===== HEADER ===== */
.header {
    background: #2c4768 !important;
    color: white !important;
    padding: 30px;
    text-align: center;
}

.header h1 {
    margin: 0;
    font-size: 2.5em;
    font-weight: 300;
    color: white !important;
}

/* ===== CONTENT ===== */
.content {
    padding: 40px;
    color: #333;
}

/* ===== TABS ===== */
.tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 2px solid #e9ecef;
}

.tab {
    padding: 15px 30px;
    cursor: pointer;
    border: none;
    background: none;
    font-size: 16px;
    font-weight: 500;
    color: #6c757d;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

.tab.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab:hover {
    color: #667eea;
}

.tab-content {
    display: none;
}

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

/* ===== BUTTONS ===== */
.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    color: white !important;
    border: none;
    padding: 12px 24px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    margin: 5px;
    border-radius: 8px;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.btn-success {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%) !important;
}

.btn-warning {
    background: linear-gradient(135deg, #ffc107 0%, #fd7e14 100%) !important;
}

.btn-danger {
    background: linear-gradient(135deg, #dc3545 0%, #e83e8c 100%) !important;
}

.btn-logout {
    background: linear-gradient(135deg, #dc3545 0%, #e83e8c 100%) !important;
    color: white !important;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    margin-left: 10px;
}

.btn-logout:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(220, 53, 69, 0.3);
    color: white !important;
    text-decoration: none;
}

.header-links {
    margin-top: 15px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.btn-tree-view {
    background: rgba(255, 255, 255, 0.2) !important;
    color: white !important;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-tree-view:hover {
    background: rgba(255, 255, 255, 0.3) !important;
    color: white !important;
    text-decoration: none;
    transform: translateY(-1px);
}

/* ===== FORMS ===== */
.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 20px;
}

.form-group label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 8px;
}

.form-group input,
.form-group select {
    padding: 12px;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* ===== MESSAGES ===== */
.loading {
    text-align: center;
    color: #667eea;
    font-weight: 500;
    padding: 20px;
}

.message {
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    font-weight: 500;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 10px;
    }

    .content {
        padding: 20px;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab {
        padding: 10px 15px;
        font-size: 14px;
    }
}

/* Header Links */
.header-links {
    margin-top: 10px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

.btn-tree-view {
    display: inline-block;
    padding: 8px 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-tree-view:hover {
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    color: white;
    text-decoration: none;
}