.dna-neo-wrapper {
    --bg-white: #ffffff;
    --bg-page: #f0f4f8;
    --border-ink: 3px solid #001219;
    --shadow-solid: 5px 5px 0px #001219;
    --shadow-push: 2px 2px 0px #001219;
    
    /* ADN Palette */
    --clr-cyan: #00f5d4;     /* Xanh ngọc - Công nghệ */
    --clr-yellow: #fee440;   /* Vàng tươi - Cảnh báo/Btn */
    --clr-blue: #00bbf9;
    --clr-purple: #9b5de5;
    --clr-danger: #f15bb5;

    max-width: 850px;
    margin: 0 auto;
    font-family: system-ui, -apple-system, sans-serif;
    color: #001219;
    background: var(--bg-page);
    padding: 20px;
    border: var(--border-ink);
    border-radius: 16px;
    box-shadow: 8px 8px 0px #001219;
}

.dna-neo-wrapper * { box-sizing: border-box; }

.dna-neo-header { background: var(--clr-cyan); border: var(--border-ink); box-shadow: var(--shadow-solid); padding: 20px; border-radius: 12px; text-align: center; margin-bottom: 25px; }
.dna-neo-header h2 { margin: 0 0 10px 0; font-size: 1.8rem; font-weight: 900; }

/* Tabs Chế độ */
.dna-mode-toggle { display: flex; gap: 15px; margin-bottom: 20px; }
.radio-mode { flex: 1; cursor: pointer; }
.radio-mode input { display: none; }
.radio-mode .neo-content { display: block; text-align: center; padding: 14px; font-weight: 800; border: var(--border-ink); border-radius: 12px; background: var(--bg-white); box-shadow: 4px 4px 0px #001219; transition: all 0.15s; }
.radio-mode input:checked + .neo-content { background: var(--clr-yellow); box-shadow: var(--shadow-push); transform: translate(2px, 2px); }

/* Form Elements */
.dna-neo-form { display: flex; flex-direction: column; gap: 15px; }
.dna-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.dna-group { display: flex; flex-direction: column; gap: 8px; }
.dna-group label { font-weight: 800; font-size: 1.05rem; }
.dna-helper { font-size: 0.85rem; font-weight: 600; color: #444; background: #e9ecef; padding: 8px 10px; border-radius: 6px; border: 1px dashed #001219;}

/* Gộp Select và Input */
.input-with-select { display: flex; flex-direction: column; border: var(--border-ink); border-radius: 12px; box-shadow: 4px 4px 0px #001219; background: #fff; overflow: hidden; }
.input-with-select select { border: none; border-bottom: 2px solid #001219; padding: 12px; font-weight: 700; background: #f8f9fa; outline: none; cursor: pointer; }
.input-with-select input { border: none; padding: 15px; font-size: 1.2rem; font-weight: 900; outline: none; text-align: center; }
.input-with-select input:focus { background: var(--clr-yellow); }

.dna-neo-wrapper textarea { width: 100%; padding: 15px; font-size: 1.2rem; font-weight: 800; font-family: monospace; letter-spacing: 2px; border: var(--border-ink); border-radius: 12px; box-shadow: 4px 4px 0px #001219; outline: none; text-transform: uppercase; line-height: 1.5; resize: vertical;}
.dna-neo-wrapper textarea:focus { background: #e0fbfc; }

.dna-error-alert { background: var(--clr-danger); color: #fff; border: var(--border-ink); padding: 12px; border-radius: 8px; font-weight: 700; text-align: center; }

/* Button */
.dna-neo-btn { padding: 18px; font-size: 1.2rem; font-weight: 900; background: #001219; color: #fff; border: var(--border-ink); border-radius: 12px; box-shadow: 5px 5px 0px var(--clr-cyan); cursor: pointer; text-transform: uppercase; margin-top: 10px; transition: all 0.1s; }
.dna-neo-btn:active { box-shadow: 2px 2px 0px var(--clr-cyan); transform: translate(3px, 3px); }

/* Result Layout */
.dna-neo-result { margin-top: 30px; padding-top: 30px; border-top: 4px dashed #001219; }
.dna-neo-result.active { display: block !important; animation: popUp 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }

.dna-bases-box { background: #fff; border: var(--border-ink); box-shadow: var(--shadow-solid); border-radius: 12px; padding: 20px; margin-bottom: 20px; text-align: center; }
.dna-bases-box h3 { margin: 0 0 15px 0; }
.bases-grid { display: flex; gap: 15px; }
.base-card { flex: 1; border: 3px solid #001219; border-radius: 10px; padding: 15px; display: flex; flex-direction: column; align-items: center; box-shadow: 3px 3px 0px #001219; }
.base-at { background: var(--clr-blue); color: #fff; }
.base-gc { background: var(--clr-danger); color: #fff; }
.b-name { font-size: 1.2rem; font-weight: 800; border-bottom: 2px solid #fff; padding-bottom: 5px; margin-bottom: 5px;}
.b-val { font-size: 2.2rem; font-weight: 900; }
.b-percent { font-size: 1rem; font-weight: 700; opacity: 0.9; }

/* 4 thông số */
.dna-params-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-bottom: 20px; }
.param-card { background: #fff; border: var(--border-ink); box-shadow: 3px 3px 0px #001219; border-radius: 10px; padding: 15px; display: flex; align-items: center; gap: 15px; }
.param-card .p-icon { font-size: 2rem; }
.param-card .p-info { display: flex; flex-direction: column; }
.p-label { font-size: 0.85rem; font-weight: 700; color: #555; text-transform: uppercase; }
.p-val { font-size: 1.4rem; font-weight: 900; }
.p-info small { color: #666; font-weight: 600; }

/* Liên kết */
.dna-bonds-box { background: #fff; border: var(--border-ink); box-shadow: var(--shadow-solid); border-radius: 12px; padding: 20px; }
.dna-bonds-box h4 { margin: 0 0 15px 0; border-bottom: 2px solid #001219; padding-bottom: 5px; }
.bonds-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.bonds-list li { display: flex; justify-content: space-between; align-items: center; padding: 12px; background: #f8f9fa; border: 2px dashed #001219; border-radius: 8px; font-size: 0.95rem; }
.bond-val { padding: 5px 15px; border-radius: 20px; font-weight: 900; font-size: 1.2rem; border: 2px solid #001219; }
.badge-hydro { background: var(--clr-yellow); }
.badge-covalent { background: var(--clr-cyan); }

@keyframes popUp { 0% { opacity: 0; transform: translateY(20px); } 100% { opacity: 1; transform: translateY(0); } }

@media (max-width: 650px) {
    .dna-form-grid, .dna-params-grid { grid-template-columns: 1fr; }
    .bases-grid { flex-direction: column; }
}