/* Trang đích /hoc-phi/, /khoa-hoc/hang-b/, /khoa-hoc/hang-c/ (sinh bằng scripts/build_trang_dich.py).
   Nạp sau kien-thuc/style.css (biến màu, header, footer, breadcrumb, bảng, FAQ). */
section.blk{padding:44px 0}
section.soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.blk h2{font-size:clamp(1.4rem,3.4vw,1.9rem);font-weight:800}
.blk .lead{color:var(--muted);max-width:680px;margin:0 0 8px}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--brand);margin-bottom:6px}

/* Hero */
.lp-hero{background:linear-gradient(135deg,var(--brand-d) 0%,var(--brand) 60%,#1673c4 100%);color:#fff;padding:20px 0 48px}
.lp-hero .crumb,.lp-hero .crumb a{color:rgba(255,255,255,.75)}
.lp-hero-grid{display:grid;gap:28px;align-items:center;margin-top:18px}
@media (min-width:880px){.lp-hero-grid{grid-template-columns:1.2fr .8fr}}
.lp-hero h1{font-size:clamp(1.75rem,4.8vw,2.7rem);font-weight:800;margin:0 0 14px}
.lp-hero h1 em{font-style:normal;color:#7dd3fc}
.lp-hero p{font-size:1.06rem;opacity:.92;margin:0 0 22px;max-width:580px}
.lp-ctas{display:flex;flex-wrap:wrap;gap:12px}
.lp-points{display:flex;flex-wrap:wrap;gap:6px 18px;margin:22px 0 0;padding:0;list-style:none;font-size:.95rem;font-weight:500}
.lp-points li::before{content:"✓";color:var(--accent);font-weight:800;margin-right:6px}
.lp-card{background:#fff;color:var(--ink);border-radius:20px;padding:22px;box-shadow:0 20px 50px rgba(0,0,0,.25)}
.lp-card .price{font-size:2.2rem;font-weight:800;color:var(--brand);line-height:1.1}
.lp-card .price small{font-size:1rem;color:var(--muted);font-weight:600}
.lp-card ul{list-style:none;padding:0;margin:14px 0 18px;display:grid;gap:6px;font-size:.95rem}
.lp-card li::before{content:"✓";color:var(--brand);font-weight:800;margin-right:8px}
.lp-card .btn{width:100%}
.price-line{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:10px 0;border-top:1px dashed var(--line)}
.price-line:first-child{border-top:0;padding-top:0}
.price-line b{font-size:1.2rem;color:var(--brand);white-space:nowrap}

/* Thẻ / lưới */
.grid2{display:grid;gap:18px;margin-top:22px}
@media (min-width:760px){.grid2{grid-template-columns:1fr 1fr}}
.grid3{display:grid;gap:16px;margin-top:22px}
@media (min-width:760px){.grid3{grid-template-columns:repeat(3,1fr)}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card h3{font-size:1.1rem}
.card p{margin:0;color:var(--muted);font-size:.95rem}
.card .ico{font-size:1.6rem;margin-bottom:8px}
.chk{list-style:none;padding:0;margin:0;display:grid;gap:9px}
.chk li{display:flex;gap:10px;font-size:.96rem}
.chk li::before{content:"✓";color:var(--brand);font-weight:800}
.chk.no li::before{content:"•";color:var(--muted)}

/* Lộ trình */
.steps{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:14px;counter-reset:s}
@media (min-width:880px){.steps{grid-template-columns:repeat(4,1fr)}}
.steps li{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.steps li::before{counter-increment:s;content:counter(s);width:38px;height:38px;border-radius:12px;background:var(--brand);color:#fff;font-weight:800;display:grid;place-items:center;margin-bottom:12px}
.steps b{display:block;margin-bottom:4px}
.steps span{color:var(--muted);font-size:.93rem}

/* Công cụ tính chi phí */
.calc{display:grid;gap:20px;margin-top:22px}
@media (min-width:880px){.calc{grid-template-columns:.9fr 1.1fr;align-items:start}}
.calc-in,.calc-res{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:var(--shadow)}
.calc fieldset{border:0;padding:0;margin:0 0 18px}
.calc legend{font-weight:700;margin-bottom:10px;padding:0}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips label{cursor:pointer}
.chips input{position:absolute;opacity:0;pointer-events:none}
.chips span{display:inline-block;padding:9px 16px;border-radius:999px;border:1.5px solid var(--line);font-weight:600;font-size:.93rem;color:var(--muted);background:#fff}
.chips input:checked+span{background:var(--brand);border-color:var(--brand);color:#fff}
.chips input:focus-visible+span{outline:3px solid rgba(56,189,248,.6);outline-offset:2px}
.ticks{display:grid;gap:8px}
.ticks label{display:flex;gap:10px;align-items:center;font-size:.95rem;cursor:pointer}
.ticks label[hidden]{display:none}
.ticks input{width:18px;height:18px;accent-color:var(--brand)}
.ticks small{color:var(--muted);margin-left:auto;white-space:nowrap}
.calc-hint{font-size:.85rem;color:var(--muted);margin:6px 0 0}
.calc-row{display:flex;justify-content:space-between;gap:14px;padding:12px 0;border-bottom:1px dashed var(--line)}
.calc-row:first-child{padding-top:0}
.calc-row small{display:block;color:var(--muted);font-size:.84rem;line-height:1.45;margin-top:2px}
.calc-row>b{white-space:nowrap;color:var(--brand-d)}
.calc-total{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:14px 0 4px;font-weight:700}
.calc-total b{font-size:1.65rem;color:var(--brand);white-space:nowrap}
.calc-lead{margin-top:18px;background:var(--brand-l);border-radius:16px;padding:18px}
.calc-lead h3{font-size:1.05rem;margin:0 0 4px}
.calc-lead>p{margin:0 0 12px;font-size:.92rem;color:var(--muted)}
.calc-lead .row{display:grid;gap:10px}
@media (min-width:560px){.calc-lead .row{grid-template-columns:1fr 1fr}}

/* Form */
.lf input,.lf select,.lf textarea{width:100%;font:inherit;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;background:#fff;color:var(--ink)}
.lf input:focus,.lf select:focus,.lf textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(11,79,138,.18)}
.lf label.f{display:block;font-weight:600;font-size:.9rem;margin:14px 0 6px}
.lf .consent{display:flex;gap:10px;align-items:flex-start;font-size:.84rem;color:var(--muted);margin-top:12px}
.lf .consent input{width:18px;height:18px;margin-top:3px;flex:none;accent-color:var(--brand)}
.lf .btn{width:100%;margin-top:14px}
.lf .hp{position:absolute;left:-9999px}
.form-msg{margin:10px 0 0;font-size:.92rem;font-weight:600;display:none}
.form-msg.ok{display:block;color:var(--brand)}
.form-msg.err{display:block;color:#b42318}

.signup{background:linear-gradient(135deg,var(--brand-d),var(--brand));color:#fff;padding:48px 0}
.signup-grid{display:grid;gap:28px;align-items:start}
@media (min-width:880px){.signup-grid{grid-template-columns:1fr 1fr}}
.signup h2{color:#fff}
.signup p{color:rgba(255,255,255,.85)}
.signup .contacts{list-style:none;padding:0;margin:20px 0 0;display:grid;gap:12px}
.signup .contacts a{display:flex;gap:12px;align-items:center;color:#fff;text-decoration:none;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);padding:12px 16px;border-radius:14px}
.signup .contacts small{display:block;opacity:.8;font-size:.82rem}
.signup form{background:#fff;color:var(--ink);border-radius:20px;padding:22px;box-shadow:0 20px 50px rgba(0,0,0,.2)}
.signup form h3{font-size:1.2rem;margin:0}

.faq{max-width:820px}
.note{font-size:.84rem;color:var(--muted)}
.links{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.links a{display:inline-block;padding:10px 16px;border:1px solid var(--line);border-radius:999px;text-decoration:none;font-weight:600;font-size:.93rem;background:#fff}
.links a:hover{border-color:var(--brand)}