:root {
    --bg-dark: #0a0a0a;
    --accent-blue: #6A97AC;
    --text-gray: #a0a0a0;
    --glass: rgba(255, 255, 255, 0.03);
    --border: rgba(255, 255, 255, 0.08);
}

body {
    background-color: var(--bg-dark);
    color: #ffffff;
    font-family: 'Plus Jakarta Sans', sans-serif;
    line-height: 1.8;
}

.grid-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.3;
}

/* Back Navigation */
.back-navigation {
    position: fixed;
    top: 30px;
    left: 5%;
    z-index: 100;
}

.back-btn {
    text-decoration: none;
    color: white;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    padding: 10px 20px;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    font-size: 14px;
    transition: 0.3s;
}

.back-btn:hover { background: var(--accent-blue); color: #000; }

/* Article Layout */
.detail-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 120px 5% 80px;
}

.detail-hero { text-align: left; margin-bottom: 60px; }
.category-tag { color: var(--accent-blue); font-weight: 800; letter-spacing: 2px; text-transform: uppercase; font-size: 13px; }
.detail-hero h1 { font-size: clamp(32px, 5vw, 56px); font-weight: 800; margin: 15px 0; line-height: 1.2; }
.hero-subtitle { font-size: 20px; color: var(--text-gray); max-width: 700px; }

.project-meta {
    display: flex;
    gap: 40px;
    margin-top: 40px;
    padding: 30px 0;
    border-top: 1px solid var(--border);
}

.meta-item span { font-size: 11px; color: var(--accent-blue); font-weight: 800; letter-spacing: 1px; }
.meta-item p { font-weight: 600; font-size: 15px; margin-top: 5px; }

/* Images */
.main-banner { width: 100%; border-radius: 30px; overflow: hidden; margin-bottom: 80px; border: 1px solid var(--border); }
.main-banner img { width: 100%; display: block; }

/* Article Body */
.article-section p {
    margin-bottom: 15px;
    color: var(--text-gray); /* Menggunakan variabel warna abu-abu kamu */
}

.challenge-list {
    list-style: none; /* Menghilangkan bulatan default */
    padding-left: 0;
    margin: 20px 0;
}

.challenge-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 12px;
    color: #a0a0a0;
    font-size: 16px;
}

/* Membuat strip kustom menggunakan pseudo-element */
.challenge-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 12px;
    height: 2px;
    background-color: var(--accent-blue); /* Strip warna biru sesuai brand kamu */
    border-radius: 2px;
}
.article-section h2 { font-size: 28px; margin-bottom: 20px; color: var(--accent-blue); }
.article-section p { font-size: 17px; color: var(--text-gray); margin-bottom: 20px; }

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 30px;
}

.feature-card {
    background: var(--glass);
    padding: 25px;
    border-radius: 20px;
    border: 1px solid var(--border);
}

.feature-card h4 { color: white; margin-bottom: 10px; }
.feature-card p { font-size: 14px; margin-bottom: 0; }

.image-group img { width: 100%; border-radius: 20px; border: 1px solid var(--border); }
.caption { font-size: 13px !important; text-align: center; margin-top: 15px; }

/* Container Tombol */
.cta-section {
    text-align: center;
    margin-top: 80px;
    padding: 60px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 40px;
    border: 1px solid var(--border);
}

.cta-section h3 {
    font-size: 24px;
    margin-bottom: 30px;
    font-weight: 800;
}

.btn-prototype {
    display: inline-block;
    background: var(--accent-blue);
    color: #0a0a0a;
    text-decoration: none;
    padding: 18px 45px;
    border-radius: 100px;
    font-weight: 800;
    font-size: 16px;
    transition: 0.4s cubic-bezier(0.2, 1, 0.3, 1);
    
    /* Perbaikan Shadow: Gunakan warna biru transparan, bukan hitam */
    box-shadow: 0 10px 30px rgba(106, 151, 172, 0.15); 
    border: 1px solid rgba(255, 255, 255, 0.1); /* Border tipis agar lebih tajam */
}

.btn-prototype:hover {
    transform: translateY(-5px);
    /* Saat hover, buat efek glow biru lebih terang */
    box-shadow: 0 15px 40px rgba(106, 151, 172, 0.4);
    filter: brightness(1.1);
}

/* Hapus styling feature-grid yang lama jika sudah tidak dipakai */
.feature-grid { display: none; }

/* Footer */
footer { padding: 40px 5%; border-top: 1px solid var(--border); text-align: center; font-size: 13px; color: var(--text-gray); }

/* Responsive */
@media (max-width: 768px) {
    .feature-grid { grid-template-columns: 1fr; }
    .project-meta { flex-direction: column; gap: 20px; }
    .cta-buttons { flex-direction: column; }
}