:root {
    --primary: #2563eb;
    --dhecr: #10b981;
    --braunecr: #f59e0b;
    --biecr: #ec4899;
    --ecr: #8b5cf6;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1) 0px 4px 12px;
}

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

body {
    background-color: var(--gray-100);
    color: var(--gray-800);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.navbar {
    background-color: var(--white);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    font-size: 1.75rem;
}

.tab-container {
    display: flex;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding: 0 1.5rem;
    overflow-x: auto;
    align-items: center;
}

.tab {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem 0.5rem 0 0;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    display: flex;
    align-items: center;
    border-bottom: 3px solid transparent;
    background-color: var(--white);
    color: var(--gray-800);
    white-space: nowrap;
}

.tab.active {
    border-bottom-width: 3px;
}

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

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

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

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

.tab-dhecr:hover {
    color: var(--dhecr);
}

.tab-braunecr:hover {
    color: var(--braunecr);
}

.tab-biecr:hover {
    color: var(--biecr);
}

.tab-ecr:hover {
    color: var(--ecr);
}

.content-header {
    display: flex;
    justify-content: flex-end;
    padding: 0.75rem 1rem;
    background-color: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
}

.btn-popout {
    display: none;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--white);
    color: var(--gray-800);
    border: 1px solid var(--gray-200);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
    margin-left: auto;
}

.btn-popout:hover {
    background-color: var(--gray-100);
    transform: translateY(-1px);
    box-shadow: rgba(0, 0, 0, 0.15) 0px 5px 15px;
}

.btn-popout i {
    font-size: 0.875rem;
    color: var(--primary);
}

.content-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--white);
    margin: 0 1.5rem 1.5rem;
    border-radius: 0 0 0.5rem 0.5rem;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.content-frame {
    flex: 1;
    border: none;
    width: 100%;
    height: calc(100vh - 180px);
    display: none;
}

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

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: calc(100vh - 180px);
    text-align: center;
    padding: 1.5rem;
}

.welcome-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.welcome-text {
    font-size: 1.125rem;
    color: var(--gray-800);
    max-width: 600px;
    margin-bottom: 2rem;
}

.site-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    width: 100%;
    max-width: 1000px;
}

.site-card {
    background-color: var(--gray-100);
    border-radius: 0.5rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease-in-out;
    cursor: pointer;
}

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

.site-card-dhecr {
    border-top: 4px solid var(--dhecr);
}

.site-card-braunecr {
    border-top: 4px solid var(--braunecr);
}

.site-card-biecr {
    border-top: 4px solid var(--biecr);
}

.site-card-ecr {
    border-top: 4px solid var(--ecr);
}

.site-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.site-card p {
    color: var(--gray-800);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.site-card-dhecr h3 {
    color: var(--dhecr);
}

.site-card-braunecr h3 {
    color: var(--braunecr);
}

.site-card-biecr h3 {
    color: var(--biecr);
}

.site-card-ecr h3 {
    color: var(--ecr);
}

.site-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    margin-top: 1rem;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #22c55e;
}

.offline {
    background-color: #ef4444;
}

.loading {
    background-color: #f59e0b;
}

.btn {
    padding: 0.5rem 1rem;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 0.25rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}

.btn:hover {
    background-color: #1d4ed8;
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .tab-container {
        padding: 0 1rem;
        margin-top: 1rem;
    }
    
    .content-container {
        margin: 0 1rem 1rem;
    }
    
    .site-cards {
        grid-template-columns: 1fr;
    }
}