:root {
            --primary-color: #4a90e2;
            --secondary-color: #f5f7fa;
            --text-color: #333;
            --success-color: #2ec4b6;
            --danger-color: #e71d36;
            --border-radius: 10px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #eef2f7;
            color: var(--text-color);
            line-height: 1.6;
            padding: 20px;
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
        }

        header {
            text-align: center;
            margin-bottom: 30px;
            background: white;
            padding: 20px;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
        }

        h1 {
            color: var(--primary-color);
            margin-bottom: 5px;
        }

        .subtitle {
            color: #666;
            font-size: 1rem;
        }

        /* --- TAMPILAN GRID MENU AWAL --- */
        .grid-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            padding-bottom: 30px;
        }

        .grid-card {
            background: white;
            padding: 25px 20px;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, background-color 0.2s;
            border: 2px solid transparent;
            text-align: center;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .grid-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 15px rgba(0,0,0,0.1);
            border-color: var(--primary-color);
        }

        .grid-card h3 {
            color: var(--primary-color);
            margin-bottom: 10px;
            font-size: 1.2rem;
            line-height: 1.3;
        }

        .grid-card p {
            color: #888;
            font-size: 0.85rem;
            margin-top: auto;
        }

        /* LOGIKA WARNA DINAMIS */
        .grid-card.selesai {
            background-color: #d4edda;
            border-color: var(--success-color);
        }
        .grid-card.selesai h3 {
            color: #155724;
        }
        .grid-card.selesai p {
            color: #155724;
            opacity: 0.7;
        }

        .grid-card.gold {
            background: linear-gradient(135deg, #fff9e6 0%, #ffeaa7 100%);
            border-color: #f1c40f;
            box-shadow: 0 4px 10px rgba(241, 196, 15, 0.2);
        }
        .grid-card.gold h3 {
            color: #b7791f;
            text-shadow: 0 1px 0 rgba(255,255,255,0.5);
        }
        .grid-card.gold p {
            color: #b7791f;
            font-weight: bold;
        }

        /* --- TAMPILAN KUIS --- */
        .hidden {
            display: none !important;
        }

        .btn-back {
            background-color: #6c757d;
            color: white;
            border: none;
            padding: 5px 10px;
            font-size: 14px;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: background 0.2s;
            box-shadow: 0 2px 5px rgba(0,0,0,0.15); /* Memberikan bayangan halus saat melayang */
        }

        .btn-back:hover {
            background-color: #5a6268;
        }

        .quiz-title-header {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--secondary-color);
        }

        .card {
            background: white;
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            margin-bottom: 25px;
        }

        .reading-box {
            font-size: 18px;
            letter-spacing: 0.5px;
            white-space: pre-line;
            background: var(--secondary-color);
            padding: 20px;
            border-left: 5px solid var(--primary-color);
            border-radius: 5px;
            margin-top: 15px;
        }

        h2 {
            border-bottom: 2px solid var(--secondary-color);
            padding-bottom: 10px;
            margin-bottom: 15px;
            color: #2c3e50;
        }

        .question-block {
            margin-bottom: 25px;
            padding: 15px;
            border-radius: 5px;
            background: #fdfdfd;
            border: 1px solid #e1e8ed;
        }

        .options-list {
            list-style: none;
            margin-top: 10px;
        }

        .option-item {
            margin: 8px 0;
            padding: 10px;
            border: 1px solid #ced4da;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .option-item:hover {
            background-color: #f1f3f5;
        }

        .option-item input {
            cursor: pointer;
        }

        .option-item.correct {
            background-color: #d4edda !important;
            border-color: var(--success-color) !important;
            color: #155724;
            font-weight: bold;
        }

        .option-item.wrong {
            background-color: #f8d7da !important;
            border-color: var(--danger-color) !important;
            color: #721c24;
        }

        .btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 12px 25px;
            font-size: 16px;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.2s;
            display: block;
            width: 100%;
            margin-top: 20px;
        }

        .btn:hover {
            background-color: #357abd;
        }
        
        /* Gaya tombol saat berubah menjadi 'Mulai Lagi' */
        .btn.btn-reset {
            background-color: #ff9f43;
        }
        .btn.btn-reset:hover {
            background-color: #ee5253;
        }

        .score-display {
            text-align: center;
            font-size: 20px;
            font-weight: bold;
            margin-top: 15px;
            display: none;
        }

        .vocab-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 15px;
        }

        .vocab-table th, .vocab-table td {
            border: 1px solid #dee2e6;
            padding: 12px;
            text-align: left;
        }

        .vocab-table th {
            background-color: var(--secondary-color);
        }

        .essay-block {
            margin-top: 15px;
            padding: 12px;
            background: #fff3cd;
            border-left: 5px solid #ffc107;
            border-radius: 3px;
        }
        
        .essay-btn {
            background: #6c757d;
            color: white;
            border: none;
            padding: 5px 10px;
            font-size: 12px;
            border-radius: 3px;
            cursor: pointer;
            margin-top: 5px;
        }

        .essay-answer {
            display: none;
            margin-top: 5px;
            font-weight: bold;
            color: #856404;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: scale(0.9); }
            to { opacity: 1; transform: scale(1); }
        }

        /* Mengatur spasi antar baris agar furigana tidak saling bertabrakan */
        .reading-box {
            line-height: 2.5; /* Dinaikkan dari 1.6 ke 2.5 agar ada ruang untuk furigana */
        }

        /* Mengatur tampilan huruf kanji/ruby */
        ruby {
            ruby-position: over; /* Memastikan furigana selalu berada di atas kanji */
            font-size: 20px;     /* Ukuran kanji sedikit diperbesar agar lebih mudah dibaca */
        }

        /* Mengatur tampilan teks furigana (huruf kecil di atas kanji) */
        rt {
            font-size: 0.55em;      /* Ukuran furigana ideal (sekitar 50-60% dari ukuran kanji) */
            color: #555;            /* Mengubah warna furigana sedikit abu-abu agar mata fokus ke kanjinya */
            letter-spacing: 0.5px;  /* Memberi sedikit jarak antar huruf furigana */
            padding-bottom: 0.2em;  /* Memberi sedikit jarak vertikal antara kanji dan furigana */
            user-select: none;      /* Opsional: Membuat furigana tidak ikut terseleksi saat teks di-copy */
        }

        .grid-card {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    border: 2px solid #eef2f7;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
}

.grid-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
    border-color: var(--primary-color);
}

.grid-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #2c3e50;
    margin: 8px 0;
    text-align: center;
    line-height: 1.3;
    /* Membatasi teks agar jika terlalu panjang tidak merusak ukuran kotak */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Warna background kustom berdasarkan status pengerjaan */
.grid-card.sedang-dipelajari {
    background-color: #f0f7ff;
    border-color: #b3d7ff;
}

.grid-card.perlu-review {
    background-color: #fff9db;
    border-color: #ffe066;
}

.grid-card.gold {
    background: linear-gradient(135deg, #fff9e6 0%, #ffeaa7 100%);
    border-color: #f1c40f;
}

/* Kontainer Bar Atas Melayang dengan Jarak Aman */
.sticky-action-bar {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 999;
    backdrop-filter: blur(5px);
    
    /* Jarak vertikal (atas-bawah) 12px, jarak horizontal (kiri-kanan) 15px */
    padding: 12px 15px; 
        
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #eef2f7;
    box-sizing: border-box; /* Memastikan padding tidak membuat lebar kontainer melebihi layar */
}

/* Jika sebelumnya Anda mengatur 'position: sticky' di .btn-back, silakan hapus bagian sticky, top, dan z-index di .btn-back lama Anda agar tidak bentrok */
.btn-back {
    background-color: #6c757d;
    color: white;
    border: none;
    font-size: 13px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
}

/* Desain Komponen Toggle Switch */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.toggle-label {
    font-size: 0.85rem;
    font-weight: bold;
    color: #4a5568;
}

.switch {
    position: relative;
    display: inline-block;
    width: 46px;
    height: 24px;
}

.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #cbd5e1;
    transition: .3s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
}

input:checked + .slider {
    background-color: #2ec4b6; /* Warna hijau toska saat ON */
}

input:checked + .slider:before {
    transform: translateX(22px);
}

/* Membuat slider berbentuk bulat rapi */
.slider.round {
    border-radius: 24px;
}
.slider.round:before {
    border-radius: 50%;
}

/* Tambahkan rule CSS global untuk menyembunyikan <rt> secara instan */
.hide-furigana rt {
    display: none !important;
}