/* Trang chủ */
.hero { position: relative; overflow: hidden; padding: 72px 0 64px; border-bottom: 1px solid var(--line); }
.hero::before {
  content: ""; position: absolute; inset: -30% -15% auto auto; width: 640px; height: 640px; border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--lime) 38%, transparent), transparent); z-index: -1; pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 4px 12px; border-radius: 999px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-2); font-weight: 500; font-size: .82rem; margin-bottom: 20px; }
.eyebrow .dot { color: var(--ok); }
.hero h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); font-weight: 800; letter-spacing: -.03em; line-height: 1.12; margin-bottom: 18px; }
.hero .lead { font-size: 1.1rem; color: var(--ink-2); max-width: 540px; margin-bottom: 28px; }
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.hero .checks { font-size: .94rem; }

/* Ví dụ một câu hỏi */
.demo { padding: 22px; box-shadow: var(--shadow); }
.demo-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 14px; }
.demo-q { font-weight: 600; margin-bottom: 14px; }
.demo-opt { display: flex; gap: 12px; align-items: flex-start; padding: 10px 14px; border: 1px solid var(--line-strong); border-radius: 10px; margin-bottom: 8px; font-size: .92rem; background: var(--surface); }
.demo-opt .L { flex: none; width: 24px; height: 24px; border-radius: 6px; display: grid; place-items: center; font-weight: 700; font-size: .78rem; background: var(--surface-2); color: var(--ink-2); }
.demo-opt.ok { border-color: var(--ok); background: var(--ok-bg); }
.demo-opt.ok .L { background: var(--ok); color: #fff; }
.demo-opt.bad { border-color: var(--bad); background: var(--bad-bg); }
.demo-opt.bad .L { background: var(--bad); color: #fff; }
.demo-explain { margin-top: 12px; padding: 12px 14px; border-radius: 10px; background: var(--surface-2); font-size: .88rem; color: var(--ink-2); }
.demo-explain b { display: block; color: var(--ink); margin-bottom: 2px; }

.section { padding: 80px 0; }
.section-alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 640px; margin: 0 0 36px; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -.025em; }
.section-head p { color: var(--ink-2); font-size: 1.02rem; margin: 0; }
.kicker { display: block; color: var(--muted); font-weight: 600; font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 10px; }

/* Danh mục bộ đề: tìm kiếm, lọc, phân trang */
.catalog { scroll-margin-top: calc(var(--header-h) + 16px); }
.cat-toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 12px; }
.cat-search { flex: 1 1 320px; display: flex; align-items: center; gap: 10px; padding: 0 6px 0 14px; min-height: 44px; border-radius: 10px; border: 1px solid var(--line-strong); background: var(--surface); cursor: text; transition: border-color .15s, box-shadow .15s; }
.cat-search:focus-within { border-color: var(--brand); box-shadow: var(--ring); }
.cat-search > .i { color: var(--muted); }
.cat-search input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; padding: 8px 0; font-size: .96rem; }
.cat-search input::-webkit-search-cancel-button { display: none; }
.cat-clear { width: 32px; height: 32px; border-radius: 8px; border: 0; background: transparent; color: var(--muted); cursor: pointer; flex: none; display: grid; place-items: center; }
.cat-clear:hover { background: var(--surface-2); color: var(--ink); }
.cat-controls { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
select.input.cat-sort { width: auto; min-height: 44px; font-weight: 500; font-size: .9rem; }
.cat-chips { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.cat-summary { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; min-height: 26px; margin-bottom: 16px; color: var(--muted); font-size: .9rem; }
.cat-summary b { color: var(--ink); font-weight: 600; }
.cat-more { margin-top: 24px; text-align: center; color: var(--muted); font-size: .92rem; }
#pkgPager .pager { margin-top: 16px; }

@media (max-width: 720px) {
  .cat-search kbd { display: none; }
  .cat-controls { width: 100%; }
  .seg { flex: 1; }
  .seg button { flex: 1; padding: 6px 8px; }
  .cat-sort { flex: 1 1 100%; }
  /* Chip danh mục cuộn ngang trên điện thoại thay vì xuống nhiều dòng */
  .cat-chips { flex-wrap: nowrap; overflow-x: auto; margin: 0 -16px 14px; padding: 0 16px 4px; scrollbar-width: none; }
  .cat-chips::-webkit-scrollbar { display: none; }
}

/* Tính năng */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.feature { padding: 26px 24px; background: var(--surface); }
.feature h3 { font-size: 1rem; margin-bottom: 6px; }
.feature p { color: var(--ink-2); font-size: .93rem; margin: 0; }

/* Các bước */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: step; }
.step { padding: 24px 22px; }
.step::before { counter-increment: step; content: counter(step, decimal-leading-zero); display: block; font-weight: 700; font-size: .85rem; color: var(--muted); letter-spacing: .04em; margin-bottom: 18px; }
.step h3 { font-size: 1rem; }
.step p { color: var(--ink-2); font-size: .92rem; margin: 0; }

/* Bảng giá */
.pricing { display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; align-items: stretch; }
.price-card { padding: 32px; border: 1.5px solid var(--olive); }
:root[data-theme="dark"] .price-card { border-color: var(--lime); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .price-card { border-color: var(--lime); } }
.price-card .big { font-size: 2.5rem; font-weight: 800; letter-spacing: -.03em; }
.price-card .checks { margin: 22px 0 26px; }
.compare { padding: 32px; background: var(--surface-2); }
.compare h3 { font-size: 1rem; margin-bottom: 8px; }
.compare-row { display: flex; justify-content: space-between; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--line-strong); font-size: .93rem; color: var(--ink-2); }
.compare-row:last-child { border-bottom: none; color: var(--ink); font-weight: 600; }

/* Hỏi đáp */
.faq { max-width: 780px; margin: 0 auto; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; padding: 18px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .i { color: var(--muted); transition: transform .2s; }
.faq details[open] summary .i { transform: rotate(180deg); }
.faq details p { color: var(--ink-2); margin: -4px 0 18px; max-width: 680px; }

.cta-band { border-radius: 20px; padding: 56px 32px; text-align: center; color: #fff; background: var(--olive); }
.cta-band h2 { color: var(--lime); font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -.025em; }
.cta-band p { opacity: .85; font-size: 1.02rem; margin-bottom: 24px; }
:root[data-theme="dark"] .cta-band { background: var(--surface); border: 1px solid var(--line); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .cta-band { background: var(--surface); border: 1px solid var(--line); } }

@media (max-width: 960px) {
  .hero-grid, .pricing { grid-template-columns: 1fr; }
  .hero-grid { gap: 40px; }
  .demo { max-width: 560px; }
  .steps { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .hero { padding: 44px 0 48px; }
  .feature-grid, .steps { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .hero-cta .btn { flex: 1; }
  .price-card, .compare { padding: 24px; }
}