:root {
    --main-bg: #E8F9FF;
    /* Update: Gradien baru dengan pendaran cahaya sesuai gambar referensi */
    --header-gradient: radial-gradient(circle at 20% 80%, #4ea8c9 0%, #2c6885 40%, #1a4a5e 100%);
    --primary-blue: #0b7aa8; 
    --hover-blue: #096891;
    --light-blue-bg: #f0faff;
    --dark-text: #1a4a5e;
    --text-secondary: #555;
    --white: #ffffff;
    --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
    --transition-speed: 0.3s;
}

* {
    margin: 0;P
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--main-bg);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    color: var(--dark-text);
}

.container {
    width: 100%;
    max-width: 480px;
    text-align: center;
    /* Perbaikan: Container menggunakan bg biru muda agar lengkungan header/footer bersih */
    background: var(--main-bg); 
    box-shadow: 0 0 50px rgba(0,0,0,0.03);
    display: flex;
    flex-direction: column;
}

/* --- Animations --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shine {
    100% { left: 125%; }
}

/* --- Header (Updated) --- */
header {
    background: var(--header-gradient);
    padding: 60px 20px 50px 20px;
    color: white;
    position: relative;
    overflow: hidden;
    border-bottom-left-radius: 40px;
    border-bottom-right-radius: 40px;
    /* Menghapus gap visual */
    margin-bottom: -1px; 
}

header::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIgaGVpZ2h0PSI0MCIgdmlld0JveD0iMCAwIDQwIDQwIj48ZyBmaWxsLXJ1bGU9ImV2ZW5vZGQiPjxnIGZpbGw9IiNmZmYiIGZpbGwtb3BhY2l0eT0iMC4wNSI+PHBhdGggZD0iTTAgMGg0MHY0MEgwVjB6bTIwIDIwaDIwdjIwSDIWMjB6TTAgMjBoMjB2MjBIMFYyMHoyMCAwaDIwdjIwSDIwVjB6Ii8+PC9nPjwvZz48L3N2Zz4=');
    opacity: 0.2;
}

header::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -10%;
    width: 250px;
    height: 250px;
    background: rgba(78, 168, 201, 0.4);
    filter: blur(80px);
    border-radius: 50%;
    z-index: 0;
}

.profile-img-container {
    position: relative;
    display: inline-block;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s var(--ease-out);
    z-index: 1;
}

.profile-img {
    width: 125px;
    height: 125px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

/* --- Footer (Updated) --- */
.brand-footer {
    /* Perbaikan: Background sama dengan header */
    background: var(--header-gradient);
    padding: 50px 20px;
    color: white;
    border-top-left-radius: 40px;
    border-top-right-radius: 40px;
    /* Perbaikan: Menghilangkan area putih di atas footer */
    margin-top: 0; 
    position: relative;
    overflow: hidden;
}

h1 {
    font-size: 28px;
    letter-spacing: 3px;
    font-weight: 700;
    margin-bottom: 8px;
    animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}

.subtitle {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 25px;
    opacity: 0.85;
    animation: fadeInUp 0.8s var(--ease-out) 0.3s both;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
    animation: fadeInUp 0.8s var(--ease-out) 0.4s both;
}

.icon-box {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    padding: 5px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    transition: all var(--transition-speed) var(--ease-out);
}

.icon-box:active {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
}

/* --- Content Area --- */
.content {
    padding: 25px 20px;
    /* Perbaikan: Memastikan content mengisi bg utama agar tidak ada sela putih */
    background-color: var(--main-bg);
    flex: 1;
}

.btn-premium {
    background: var(--primary-blue);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border-radius: 15px;
    text-decoration: none;
    font-weight: 700;
    position: relative;
    overflow: hidden;
    box-shadow: 0 6px 15px rgba(11, 122, 168, 0.25);
    transition: all var(--transition-speed) var(--ease-out);
}

.btn-premium::after {
    content: '';
    position: absolute;
    top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.3) 50%, rgba(255,255,255,0) 100%);
    transform: skewX(-25deg);
    animation: shine 3s infinite;
}

.btn-premium:active {
    transform: scale(0.97);
    background-color: var(--hover-blue);
    box-shadow: 0 2px 8px rgba(11, 122, 168, 0.2);
}

.btn-main {
    padding: 18px;
    font-size: 15px;
    letter-spacing: 1px;
    margin-bottom: 25px;
}

.grid-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px; 
    margin-bottom: 35px;
    padding: 5px;
}

.card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 22px; 
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.7); 
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 10px 20px -5px rgba(11, 122, 168, 0.08); 
    transition: all 0.5s var(--ease-out);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
}

.card-img-wrapper {
    width: 100%;
    border-radius: 14px;
    overflow: hidden;
    margin-bottom: 12px;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.02);
}

.card-img {
    width: 100%;
    display: block;
    transition: transform 0.8s var(--ease-out);
}

.card-btn {
    background: var(--primary-blue);
    color: white;
    font-size: 10px;
    font-weight: 800;
    padding: 11px 5px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    display: block;
    text-decoration: none;
    margin-top: auto;
    transition: all 0.3s ease;
}

.card:hover, .card:active {
    transform: translateY(-6px);
    background: #ffffff;
    box-shadow: 0 20px 25px -5px rgba(11, 122, 168, 0.15);
    border-color: rgba(11, 122, 168, 0.2);
}

.card:hover .card-img, .card:active .card-img {
    transform: scale(1.1);
}

/* --- Rombak Card Buku: Penyesuaian Lebar & Tombol Gradient --- */
.book-section {
    background: var(--white);
    border-radius: 35px;
    padding: 0 0 35px 0;
    /* Update: Margin disesuaikan agar lebar sama dengan grid & portofolio */
    margin: 0 0 40px 0; 
    box-shadow: 0 20px 50px rgba(13, 130, 179, 0.1); 
    border: 1px solid rgba(0, 0, 0, 0.03);
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
}

.book-img-container {
    width: 100%;
    background: var(--white); /* Samakan dengan kartu */
    padding: 0; /* Hilangkan semua padding agar gambar maksimal */
    margin: 0; /* Hilangkan margin */
    display: flex;
    justify-content: center;
}

.book-img {
    width: 100%; /* Gambar memenuhi lebar kartu */
    height: auto;
    display: block;
    filter: none; /* Shadow dihapus sesuai permintaan */
    transform: none; /* Dibuat lurus agar memenuhi ruang dengan apik */
    transition: transform 0.3s ease;
}

.book-desc {
    font-size: 14px;
    line-height: 1.6;
    color: #556a75;
    margin: 25px 0;
    padding: 0 25px; /* Padding teks agar tidak menempel ke pinggir */
    text-align: left;
}

/* Update: Tombol dengan Gradien sesuai gambar referensi */
.btn-selengkapnya-premium {
    /* Warna gradient biru-gelap ke biru-terang */
    background: linear-gradient(to right, #1d5f96 0%, #3a8cc1 50%, #15466e 100%);
    background-size: 200% auto;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    width: 85%;
    border-radius: 15px;
    text-decoration: none;
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 6px 15px rgba(11, 122, 168, 0.3);
    transition: all 0.5s var(--ease-out);
}

/* Shine Effect tetap dipertahankan untuk estetika */
.btn-selengkapnya-premium::after {
    content: '';
    position: absolute;
    top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.2) 50%, rgba(255,255,255,0) 100%);
    transform: skewX(-25deg);
    animation: shine 4s infinite;
}

.btn-selengkapnya-premium:active {
    transform: scale(0.97);
    filter: brightness(1.1);
}

hr { border: 0; border-top: 1px solid #ddecf2; margin: 35px 0; }

.other-writings h3 { color: var(--primary-blue); margin-bottom: 20px; font-size: 19px; font-weight: 700; }

.list-item {
    background: var(--light-blue-bg);
    color: var(--dark-text);
    border: 1.5px solid #bddae6; 
    padding: 16px;
    border-radius: 50px;
    text-decoration: none;
    display: block;
    margin-bottom: 15px;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    transition: all var(--transition-speed);
}

.list-item:active { transform: translateX(5px); color: var(--primary-blue); border-color: var(--primary-blue); }

.footer-btns {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    margin-bottom: 50px;
}

.btn-footer {
    flex: 1;
    padding: 15px;
    font-size: 14px;
    letter-spacing: 0.5px;
}

.brand-name { font-size: 24px; font-weight: 700; letter-spacing: 2px; }

.back-insta { font-size: 11px; text-transform: uppercase; margin-top: 10px; display: block; color: #a0c4d6; text-decoration: none; }