/* ==========================================================================
   1. LAYOUT CONFIGURATION & HEADER
   ========================================================================== */
:root {
    --primary-navy: #1e3a8a;
    --primary-light: #2563eb;
    --accent-green: #10b981;
    --accent-hover: #059669;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --border-color: #e2e8f0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-light);
    margin: 0;
    padding: 0;
    color: var(--text-dark);
}

/* Header atas untuk menyamakan tema dengan Landing Page */
.page-header {
    background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-light) 100%);
    color: var(--white);
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 40px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.page-header h1 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 700;
}

.page-header p {
    margin: 8px 0 0 0;
    font-size: 0.95rem;
    opacity: 0.8;
}

/* ==========================================================================
   2. CONTAINER & GEJALA ITEM CARD
   ========================================================================== */
.box {
    max-width: 750px; /* Diperlebar sedikit agar teks gejala tidak terlalu sempit */
    margin: 0 auto 60px auto;
    background: var(--white);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
}

/* Setiap baris gejala berupa komponen kartu kecil */
.symptom-item {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    margin-bottom: 12px;
    border: 1.5px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.25s ease;
    user-select: none;
}

/* Efek Hover saat kursor mendekati kartu */
.symptom-item:hover {
    border-color: var(--primary-light);
    background-color: #f0f5ff;
    transform: translateY(-1px);
}

/* Styling Checkbox Kustom */
.symptom-item input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border: 2px solid #cbd5e1;
    border-radius: 6px;
    margin-right: 18px;
    margin-top: 0; /* Menjaga posisi tetap simetris di tengah */
    flex-shrink: 0;
    cursor: pointer;
    display: grid;
    place-content: center;
    transition: all 0.2s ease;
}

/* Efek Checkbox saat dicentang */
.symptom-item input[type="checkbox"]::before {
    content: "";
    width: 12px;
    height: 12px;
    transform: scale(0);
    transition: 120ms transform ease-in-out;
    background-color: var(--white);
    clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%); /* Efek bentuk centang v */
}

.symptom-item input[type="checkbox"]:checked {
    background-color: var(--primary-light);
    border-color: var(--primary-light);
}

.symptom-item input[type="checkbox"]:checked::before {
    transform: scale(1);
}

/* Perubahan warna kartu utuh saat checkbox-nya aktif terpilih */
.symptom-item:has(input[type="checkbox"]:checked) {
    border-color: var(--primary-light);
    background-color: #eff6ff;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

/* Teks Komponen di dalam Kartu */
.code {
    font-weight: 700;
    color: var(--primary-light);
    display: inline-block;
    font-size: 0.85rem;
    background-color: rgba(37, 99, 235, 0.08);
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: 4px;
}

.name {
    font-size: 1rem;
    color: var(--text-dark);
    font-weight: 500;
    display: block;
}

/* ==========================================================================
   3. BUTTON SUBMIT
   ========================================================================== */
.btn-submit {
    width: 100%;
    padding: 16px;
    background-color: var(--accent-green); /* Menggunakan warna hijau CTA agar senada */
    color: var(--white);
    border: none;
    font-weight: bold;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 25px;
    font-size: 1.05rem;
    box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.2);
    transition: all 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.btn-submit:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 15px 20px -5px rgba(16, 185, 129, 0.3);
}

/* Responsive Mobile */
@media (max-width: 640px) {
    body { padding: 0 0 40px 0; }
    .box { padding: 20px; border-radius: 0; margin-top: 0; }
    .symptom-item { padding: 14px; }
}