:root {
    --primary-color: #25D366; /* WhatsApp Green */
    --secondary-color: #075E54; /* WhatsApp Teal */
    --accent-color: #34B7F1; /* WhatsApp Blue */
    --bg-color: #111b21; /* WhatsApp Dark Mode BG */
    --card-bg: #202c33; /* WhatsApp Dark Mode Card */
    --text-color: #e9edef;
    --muted-text: #8696a0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--card-bg);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #333;
    animation: fadeInDown 0.8s ease-out;
}

.admin-link {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.9rem;
    border: 1px solid var(--accent-color);
    padding: 5px 15px;
    border-radius: 20px;
    transition: all 0.3s;
}

.admin-link:hover {
    background: var(--accent-color);
    color: #fff;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

/* Ambient background glow */
.container::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(37, 211, 102, 0.1) 0%, rgba(0,0,0,0) 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 0;
    animation: pulse 4s infinite;
}

@keyframes pulse {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
    100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    max-width: 800px;
    width: 100%;
    text-align: center;
    z-index: 1;
    border: 1px solid rgba(255,255,255,0.05);
    transition: transform 0.3s ease;
}

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

h1 {
    color: var(--primary-color);
    margin: 0;
    font-size: 1.8rem;
}

h2 {
    color: var(--text-color);
    font-weight: 400;
    margin-bottom: 1rem;
}

p {
    line-height: 1.6;
    margin-bottom: 1.5rem;
    color: var(--muted-text);
}

.qr-section {
    background: #fff;
    padding: 10px;
    display: inline-block;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.qr-section img {
    display: block;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
    text-align: left;
}

.feature-item {
    background: rgba(255,255,255,0.03);
    padding: 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--accent-color);
}

.feature-item h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.1rem;
    color: var(--text-color);
}

.feature-item p {
    font-size: 0.9rem;
    margin: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: var(--primary-color);
    color: #fff;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.4);
}

.btn:hover {
    background-color: #1da851;
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.6);
}

footer {
    background-color: var(--card-bg);
    text-align: center;
    padding: 1.5rem;
    font-size: 0.9rem;
    color: var(--muted-text);
    border-top: 1px solid #333;
    margin-top: auto;
}

footer a {
    color: var(--accent-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.status-badge {
    background: rgba(37, 211, 102, 0.2);
    color: var(--primary-color);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-block;
}