/* Global */
body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #00AEEF, #118EEA);
    color: #fff;
    overflow: hidden; /* halaman tidak bisa discroll */
    height: 100vh;    /* penuh 1 layar */
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 1.2s ease-in-out;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Background animasi */
.bg-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    animation: float 10s infinite ease-in-out;
    z-index: 0;
}
.bg1 { width: 200px; height: 200px; top: 10%; left: -100px; }
.bg2 { width: 300px; height: 300px; bottom: -150px; right: -150px; animation-delay: 2s; }
@keyframes float {
    0%,100% { transform: translateY(0px); }
    50% { transform: translateY(-30px); }
}

/* Container utama */
.container {
    position: relative;
    width: 100%;
    max-width: 420px;
    padding: 30px 25px;
    text-align: center;
    background: rgba(255,255,255,0.15);
    border-radius: 20px;
    backdrop-filter: blur(8px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.25);
    z-index: 1;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1.3s ease forwards;
    animation-delay: 0.3s;
}
@keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
}

.logo { width: 140px; margin-bottom: 20px; }
h1 { font-size: 1.5rem; margin: 20px 0; }

/* Tagline */
.tagline {
    font-size: 0.95rem;
    margin-bottom: 25px;
    opacity: 0.9;
}

/* Fitur */
.features {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin: 20px 0 30px;
}
.feature-box {
    flex: 1;
    background: rgba(255,255,255,0.15);
    padding: 12px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.feature-box .icon {
    font-size: 1.5rem;
    margin-bottom: 6px;
}

/* Tombol opsi */
.btn {
    display: block;
    width: 100%;
    max-width: 280px; /* agar presisi di tengah */
    padding: 14px;
    margin: 12px auto;
    background: #fff;
    color: #118EEA;
    font-weight: bold;
    text-decoration: none;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    text-align: center;
}
.btn:hover {
    background: #118EEA;
    color: #fff;
    transform: scale(1.05);
}