/* Bài Học Mới – trang cẩm nang và trang thông tin. Load sau styles.css và pages.css. */

/* ---------- Hero cẩm nang ---------- */
.subhero-guide { background: radial-gradient(900px 420px at 25% 0%, #fff 0%, rgb(255 255 255 / 0) 60%), linear-gradient(180deg, #e9f6ff 0%, #f4efff 55%, var(--cream) 100%); }
.subhero-guide .h1-kicker { box-shadow: 0 4px 0 #d9ccf6; }
.subhero-plain { padding-bottom: clamp(36px, 5vw, 56px); }
.subhero-plain .subhero-grid { grid-template-columns: 1fr; max-width: 860px; }
.guide-art { position: relative; width: min(360px, 82%); filter: drop-shadow(0 22px 18px rgb(36 26 77 / .22)); }
.page-meta { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: -8px 0 22px; font-size: .95rem; color: var(--muted); }
.page-meta b { color: var(--ink-2); }

/* ---------- Bố cục bài viết ---------- */
.article-wrap { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: clamp(28px, 4vw, 56px); align-items: start; padding: clamp(32px, 5vw, 56px) 0 clamp(56px, 8vw, 96px); }
.toc { position: sticky; top: calc(var(--header-h) + 20px); padding: 18px 18px 14px; border-radius: var(--r); background: #fff; box-shadow: var(--shadow-sm); }
.toc summary { list-style: none; cursor: default; font: 800 .85rem/1.3 var(--font-body); text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: 10px; }
.toc summary::-webkit-details-marker { display: none; }
.toc ol { display: grid; gap: 2px; margin: 0; padding: 0; list-style: none; }
.toc a { display: block; padding: 6px 8px; border-radius: 10px; font: 700 .96rem/1.35 var(--font-display); color: var(--ink-2); text-decoration: none; }
.toc a:hover { background: var(--purple-pale); color: var(--purple-deep); }

.prose { max-width: 760px; font-size: 1.08rem; }
.prose > * + * { margin-top: 1em; }
.prose h2 { font-size: clamp(1.55rem, 1.15rem + 1.4vw, 2.15rem); margin: 1.9em 0 .5em; scroll-margin-top: calc(var(--header-h) + 16px); }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 1.28rem; margin: 1.5em 0 .4em; }
.prose p, .prose ul, .prose ol, .prose table, .prose figure { margin-bottom: 0; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .4em; }
.prose li::marker { color: var(--purple); font-weight: 800; }
.prose strong { color: var(--ink); }
.prose a { font-weight: 700; }

.guide-figure { margin: 28px 0; }
.guide-figure img { display: block; width: 100%; height: auto; border-radius: 18px; }
.guide-figure figcaption { margin-top: 10px; font-size: .9rem; line-height: 1.5; color: var(--muted); }

.answer-box { padding: 20px 24px; border-radius: var(--r); background: #fff; border: 3px solid #e2d6ff; box-shadow: var(--shadow-sm); }
.answer-box h2 { margin: 0 0 .4em; font-size: 1.15rem; text-transform: uppercase; letter-spacing: .06em; font-family: var(--font-body); color: var(--purple-deep); }
.answer-box p { margin: 0; }
.answer-box p + p, .answer-box ul { margin-top: .6em; }

.callout { padding: 16px 20px; border-radius: 20px; background: var(--sky-pale); border-left: 6px solid var(--sky-deep); }
.callout p { margin: 0; }
.callout p + p { margin-top: .5em; }
.callout-sun { background: #fff6dc; border-left-color: var(--sun-deep); }
.callout-green { background: var(--grass-pale); border-left-color: var(--grass-deep); }

.data-table { width: 100%; border-collapse: collapse; font-size: 1rem; line-height: 1.5; background: #fff; border-radius: 18px; overflow: hidden; box-shadow: var(--shadow-sm); }
.data-table caption { caption-side: top; text-align: left; padding: 0 0 8px; font: 800 .9rem/1.3 var(--font-body); color: var(--muted); }
.data-table th, .data-table td { padding: 12px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.data-table thead th { background: var(--purple-pale); font: 800 .85rem/1.3 var(--font-body); letter-spacing: .04em; color: var(--purple-deep); }
.data-table tbody th { color: var(--ink); font-family: var(--font-display); font-weight: 800; }
.data-table tr:last-child > * { border-bottom: 0; }
@media (max-width: 640px) {
  .data-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .data-table, .data-table tbody, .data-table tr, .data-table th, .data-table td { display: block; }
  .data-table tr { padding: 10px 0; border-bottom: 1px solid var(--line); }
  .data-table tr:last-child { border-bottom: 0; }
  .data-table th, .data-table td { padding: 4px 14px; border: 0; }
  .data-table td::before { content: attr(data-label); display: block; font: 800 .74rem/1.2 var(--font-body); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
}

.step-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; list-style: none; padding: 0 !important; }
.step-cards li { margin: 0 !important; padding: 18px; border-radius: var(--r); background: #fff; box-shadow: var(--shadow-sm); }
.step-cards li::marker { content: ''; }
.step-cards img { width: 64px; height: 64px; object-fit: contain; margin-bottom: 8px; }
.step-cards b { display: block; font: 800 1.12rem/1.25 var(--font-display); color: var(--ink); }
.step-cards span { display: block; font: 800 .8rem/1.3 var(--font-body); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 6px; }
.step-cards p { margin: 0; font-size: .98rem; }
@media (max-width: 720px) { .step-cards { grid-template-columns: 1fr; } }

.related { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; list-style: none; padding: 0 !important; }
.related li { margin: 0 !important; }
.related li::marker { content: ''; }
.related a { display: block; height: 100%; padding: 16px 18px; border-radius: var(--r); background: #fff; box-shadow: 0 4px 0 var(--line), var(--shadow-sm); text-decoration: none; color: var(--ink-2); font-weight: 400; }
.related a:hover { transform: translateY(-2px); }
.related b { display: block; font: 800 1.08rem/1.3 var(--font-display); color: var(--purple-deep); margin-bottom: 4px; }
@media (max-width: 760px) { .related { grid-template-columns: 1fr; } }

.ref-list { font-size: .95rem; color: var(--muted); }
.ref-list a { color: var(--purple-deep); }

.prose .faq-list { margin-top: 1em; }
.prose .faq-list details { border-radius: 20px; background: #fff; box-shadow: var(--shadow-sm); border: 3px solid #fff; overflow: hidden; }
.prose .faq-list details[open] { border-color: #e8defc; }
.prose .faq-list summary { position: relative; list-style: none; cursor: pointer; padding: 16px 56px 16px 20px; font: 800 1.08rem/1.35 var(--font-display); color: var(--ink); }
.prose .faq-list summary::-webkit-details-marker { display: none; }
.prose .faq-list summary::after { content: '+'; position: absolute; right: 14px; top: 50%; transform: translateY(-50%); width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; background: var(--purple-pale); color: var(--purple); font: 800 1.35rem/1 var(--font-display); }
.prose .faq-list details[open] summary::after { content: '–'; background: var(--purple); color: #fff; }
.prose .faq-list details p { margin: 0; padding: 0 20px 18px; font-size: 1.02rem; }

.cta-inline { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: center; padding: 20px 22px; border-radius: 26px; background: linear-gradient(135deg, #f4efff, #e9f6ff); }
.cta-inline img { width: 88px; }
.cta-inline h2 { margin: 0 0 .25em; font-size: 1.3rem; }
.cta-inline p { margin: 0 0 12px; }
.cta-inline .hero-actions { justify-content: flex-start; }
@media (max-width: 600px) { .cta-inline { grid-template-columns: 1fr; text-align: center; } .cta-inline img { margin: 0 auto; } .cta-inline .hero-actions { justify-content: center; } }

@media (max-width: 960px) {
  .article-wrap { grid-template-columns: 1fr; }
  .toc { position: static; }
  .toc summary { cursor: pointer; margin-bottom: 0; }
  .toc[open] summary { margin-bottom: 10px; }
}

/* ---------- Bài thông báo (/bai-hoc-moi-2-0/) ---------- */
.launch-art { position: relative; display: block; width: min(300px, 72%); border-radius: 36px; overflow: hidden; background: #a5def8; box-shadow: 0 6px 0 #d9ccf6, 0 26px 40px -18px rgb(36 26 77 / .45); transform: rotate(-2deg); }
.launch-art img { display: block; width: 100%; height: auto; }
.cast { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 10px; list-style: none; padding: 0 !important; }
.cast-8 { grid-template-columns: repeat(8, minmax(0, 1fr)); }
.cast li { margin: 0 !important; }
.cast li::marker { content: ''; }
.cast figure { margin: 0; height: 100%; border-radius: 18px; overflow: hidden; background: #a5def8; box-shadow: 0 4px 0 var(--line); text-align: center; }
.cast img { display: block; width: 100%; height: auto; }
.cast figcaption { padding: 6px 4px 8px; background: #fff; font: 800 .9rem/1.2 var(--font-display); color: var(--ink); }
.cast figcaption small { display: block; font: 700 .78rem/1.3 var(--font-body); color: var(--muted); }
.prose .cast-note { margin-top: .5em; font-size: .95rem; color: var(--muted); }
.before-after { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; max-width: 480px; }
.before-after div { position: relative; border-radius: 24px; overflow: hidden; background: #a5def8; }
.before-after img { display: block; width: 100%; height: auto; }
.before-after span { position: absolute; left: 10px; top: 10px; padding: 3px 12px 1px; border-radius: 999px; background: #fff; font: 800 .9rem/1.3 var(--font-display); color: var(--ink-2); }
.before-after div + div span { background: #d02d4c; color: #fff; }
.before-after figcaption { grid-column: 1 / -1; font-size: .95rem; color: var(--muted); }
@media (max-width: 640px) {
  .cast, .cast-8 { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
  .cast figcaption { font-size: .8rem; }
  .cast figcaption small { font-size: .72rem; }
}