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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: #fff;
}

.container {
    max-width: 900px;
    width: 100%;
}

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

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.7;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.cards-single {
    max-width: 320px;
    margin: 0 auto;
}

.empty-message {
    text-align: center;
    opacity: 0.6;
    padding: 40px;
}

.card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    padding: 32px 24px;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
}

.card h2 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.qr-wrapper {
    background: #fff;
    border-radius: 12px;
    padding: 16px;
    display: inline-block;
    margin-bottom: 24px;
}

.qr-code {
    width: 160px;
    height: 160px;
    display: block;
}

.btn {
    display: block;
    padding: 14px 24px;
    border-radius: 12px;
    text-decoration: none;
    color: #fff;
    font-weight: 600;
    transition: opacity 0.2s ease, transform 0.1s ease;
}

.btn:active {
    transform: scale(0.97);
}

.btn:hover {
    opacity: 0.9;
}

.btn-ios {
    background: linear-gradient(135deg, #007AFF, #5856D6);
}

.btn-android {
    background: linear-gradient(135deg, #34A853, #0F9D58);
}

.btn-sub {
    display: block;
    font-size: 0.75rem;
    font-weight: 400;
    opacity: 0.85;
    margin-bottom: 2px;
}

.btn-main {
    display: block;
    font-size: 1.1rem;
}

/* Mobil uyumluluk */
@media (max-width: 520px) {
    .cards {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .header h1 {
        font-size: 1.6rem;
    }

    .qr-code {
        width: 140px;
        height: 140px;
    }

    .card {
        padding: 24px 20px;
    }
}