* {
    box-sizing: border-box;
}

body {
    margin: 0;

    min-height: 100vh;

    background-color: #070b20;

    background-image:
        radial-gradient(#27345c 1px, transparent 1px);

    background-size: 40px 40px;

    color: white;

    font-family: Arial, sans-serif;

    display: flex;
    justify-content: center;
}

.container {
    width: 400px;

    min-height: 100vh;

    padding: 25px 20px;

    background:
        linear-gradient(
            145deg,
            #060a18,
            #02040d
        );

    border-left: 1px solid #234a91;
    border-right: 1px solid #234a91;

    box-shadow:
        0 0 20px rgba(20, 80, 200, 0.15),
        0 0 50px rgba(20, 80, 200, 0.08);

    position: relative;

    overflow: hidden;

    isolation: isolate;
}

.container::before {
    content: "";

    position: absolute;

    top: -120px;
    right: -180px;

    width: 300px;
    height: 500px;

    background: rgba(80, 130, 230, 0.04);

    transform: rotate(30deg);

    pointer-events: none;
}

.container > * {
    position: relative;

    z-index: 1;
}

.logo {
    display: block;

    width: 180px;

    max-width: 80%;

    margin: 0 auto 15px;
}

.brand-name {
    text-align: center;

    color: #4b8cff;

    font-size: 13px;

    letter-spacing: 4px;

    margin-bottom: 20px;
}

.banner {
    width: 100%;

    margin-bottom: 15px;

    overflow: hidden;

    border-radius: 14px;

    border: 1px solid #234a91;

    box-shadow:
        0 0 15px rgba(20, 80, 200, 0.20);
}

.banner img {
    display: block;

    width: 100%;

    height: auto;

    object-fit: cover;
}

/* =========================
   STEP 6 - EFEK TOMBOL
   ========================= */

.btn {
    position: relative;
    display: block;
    width: 100%;
    padding: 13px 20px;
    margin: 12px 0;

    background: linear-gradient(135deg, #4f8df7, #2864d7);
    color: white;

    border: none;
    border-radius: 30px;

    text-align: center;
    text-decoration: none;
    font-size: 15px;
    font-weight: bold;
    letter-spacing: 1px;

    box-shadow: 0 5px 15px rgba(40, 100, 215, 0.35);

    overflow: hidden;
    transition: all 0.3s ease;
}

/* Efek saat mouse diarahkan ke tombol */
.btn:hover {
    transform: translateY(-2px);

    background: linear-gradient(135deg, #6aa3ff, #3578ed);

    box-shadow:
        0 0 10px rgba(80, 140, 255, 0.6),
        0 0 25px rgba(80, 140, 255, 0.35);

    cursor: pointer;
}

/* Efek saat tombol ditekan */
.btn:active {
    transform: translateY(1px);
}

/* Efek cahaya berjalan */
.btn::before {
    content: "";
    position: absolute;

    top: 0;
    left: -100%;

    width: 50%;
    height: 100%;

    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.35),
        transparent
    );

    transform: skewX(-20deg);

    transition: left 0.6s ease;
}

.btn:hover::before {
    left: 150%;
}

.tabs {
    display: flex;

    gap: 10px;

    margin-top: 20px;

    margin-bottom: 20px;
}

.tabs a {
    flex: 1;

    padding: 12px;

    border: 1px solid #27458c;

    border-radius: 25px;

    color: #8eb4ff;

    text-align: center;

    text-decoration: none;

    font-size: 12px;

    font-weight: bold;
}

.info {
    padding: 14px;

    border: 1px dashed #28517e;

    border-radius: 8px;

    color: #e4d600;

    text-align: center;

    font-size: 12px;

    margin-bottom: 25px;
}

footer {
    padding-top: 18px;

    border-top: 1px solid #18223f;

    text-align: center;

    color: #777f99;

    font-size: 10px;
}