:root {
        --primary-color: #1a73e8;
        --text-color: #202124;
        --bg-color: #f8f9fa;
        --card-bg: #ffffff;
    }
    body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        color: var(--text-color);
        background-color: var(--bg-color);
        line-height: 1.6;
        margin: 0;
        padding: 0;
    }

    /* --- Perbaikan Header & Navigasi Menu --- */
    header {
        background-color: var(--card-bg);
        border-bottom: 1px solid #dadce0;
        position: sticky;
        top: 0;
        z-index: 1000; /* Pastikan header induk berada di lapisan atas */
    }
    .nav-container {
        max-width: 1100px;
        margin: 0 auto;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 10px 20px;
        position: relative; /* KUNCI UTAMA: Tambahkan ini agar koordinat menu akurat */
    }
    .logo {
        font-weight: bold;
        color: var(--primary-color);
        font-size: 1.2rem;
        text-decoration: none;
    }
    
    /* Menu Utama */
    .nav-menu {
        display: flex;
        list-style: none;
        margin: 0;
        padding: 0;
    }
    .nav-item a {
        color: var(--text-color);
        text-decoration: none;
        padding: 8px 15px;
        display: block;
        font-size: 0.95rem;
        font-weight: 500;
        border-radius: 4px;
    }
    .nav-item a:hover {
        background-color: #f1f3f4;
        color: var(--primary-color);
    }

    /* Tombol Hamburger (Khusus Mobile) */
    .menu-toggle {
        display: none;
        flex-direction: column;
        cursor: pointer;
        background: none;
        border: none;
        padding: 5px;
    }
    .bar {
        width: 25px;
        height: 3px;
        background-color: var(--text-color);
        margin: 3px 0;
        border-radius: 2px;
        transition: 0.3s;
    }

    /* --- Konten & Layout --- */
    main {
        max-width: 740px;
        margin: 0 auto;
        padding: 15px;
        position: relative; /* Wajib diaktifkan agar fungsi z-index berjalan */
        z-index: 1;         /* Lapisan rendah agar berada di bawah menu */
    }
    article {
        background-color: var(--card-bg);
        padding: 20px;
        border-radius: 12px;
        box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    }
    h1 { font-size: 1.8rem; color: #202124; margin-top: 0; line-height: 1.3; }
    h2 { font-size: 1.4rem; color: #202124; margin-top: 35px; border-bottom: 2px solid #e8eaed; padding-bottom: 8px; }
    p { margin-bottom: 20px; font-size: 1.05rem; }
    ul { padding-left: 20px; margin-bottom: 25px; }
    li { margin-bottom: 12px; font-size: 1.05rem; }
    article img { max-width: 100%; height: auto; display: block; margin: 25px auto; border-radius: 8px; }
    
    .highlight-box {
        background-color: #e8f0fe;
        border-left: 4px solid var(--primary-color);
        padding: 15px 20px;
        border-radius: 0 8px 8px 0;
        margin: 25px 0;
    }

    /* Kartu Penulis */
    .author-card {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        background-color: #f1f3f4;
        padding: 20px;
        border-radius: 12px;
        margin-top: 40px;
        border: 1px solid #dadce0;
    }
    .author-img { width: 80px; height: 80px; border-radius: 50%; margin-bottom: 15px; object-fit: cover; }
    .author-info h3 { margin: 0 0 8px 0; color: #202124; font-size: 1.2rem; }
    .author-info p { margin: 0; font-size: 0.95rem; color: #5f6368; }

    footer { text-align: center; padding: 30px 15px; color: #70757a; font-size: 0.9rem; border-top: 1px solid #dadce0; margin-top: 40px; }
    footer a { color: var(--primary-color); text-decoration: none; margin: 0 8px; display: inline-block; padding: 5px; }
    
    /* --- RESPONSIVE BREAKPOINT (MOBILE & DESKTOP) --- */
    @media (max-width: 768px) {
        .menu-toggle {
            display: flex;
            flex-direction: column;
            justify-content: space-around;
            width: 30px;  
            height: 21px; 
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 0;
            box-sizing: border-box;
        }

        .bar {
            width: 100%;
            transition: all 0.3s ease;
        }
        
        .nav-menu {
            display: none; 
            position: absolute !important; 
            top: 100%; 
            left: 0;
            width: 100%;
            background-color: #ffffff;
            z-index: 99999 !important; 
            padding: 10px 0;
            margin: 0;
        }

        /* === KODE YANG HILANG SAYA MASUKKAN LAGI DI SINI === */
        .nav-menu.active {
            display: flex !important; 
            flex-direction: column !important;
        }
        /* =================================================== */

            /* Style standar list menu di HP */
        .nav-item {
            width: 100%;
            border-bottom: 1px solid #f1f3f4; 
        }

        .nav-item a {
            padding: 10px 20px !important;
            color: var(--text-color);
            display: block;
        }

        /* Efek saat jari menempel/mengetuk menu di HP */
        .nav-item a:active, 
        .nav-item a:focus {
            background-color: #e8f0fe !important; 
            color: var(--primary-color) !important; 
            padding-left: 25px !important; 
            transition: all 0.1s ease;
        }
    }


    @media (min-width: 769px) {
        main { padding: 30px 20px; }
        article { padding: 40px; }
        h1 { font-size: 2.3rem; }
        .author-card { flex-direction: row; text-align: left; padding: 25px; }
        .author-img { margin-bottom: 0; margin-right: 20px; }
    }
    /* Gaya dasar untuk tombol kontak */
    .nav-btn {
        background-color: #007bff; /* Ganti warna latar tombol di sini */
        color: white !important;   /* Warna teks putih */
        padding: 8px 16px;         /* Jarak ruang di dalam tombol */
        border-radius: 5px;        /* Membuat sudut tombol melengkung */
        text-decoration: none;     /* Menghilangkan garis bawah teks */
        transition: background 0.3s ease; /* Efek halus saat pointer mendekat */
    }

    /* Efek saat tombol diarahkan oleh mouse (hover) */
    .nav-btn:hover {
        background-color: #0056b3; /* Warna tombol saat di-hover (lebih gelap) */
    }
    /* Gaya Formulir Kontak */
        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            font-weight: 600;
            margin-bottom: 8px;
            color: #444444;
        }

        input[type="text"],
        input[type="email"],
        textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #cccccc;
            border-radius: 6px;
            box-sizing: border-box;
            font-size: 15px;
            transition: border-color 0.3s;
        }

        input[type="text"]:focus,
        input[type="email"]:focus,
        textarea:focus {
            border-color: #007bff;
            outline: none;
        }

        textarea {
            resize: vertical;
            min-height: 120px;
        }

        /* Tombol Kirim */
        .btn-submit {
            background-color: #007bff;
            color: white;
            padding: 14px 28px;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
            font-weight: bold;
            width: 100%;
            transition: background 0.2s;
        }

        .btn-submit:hover {
            background-color: #0056b3;
        }

        /* Detail Kontak Info */
        .contact-info {
            background-color: #f1f3f5;
            padding: 20px;
            border-radius: 6px;
            margin-bottom: 30px;
        }