/* ═══════════════════════════════════════════════════════════════════════════
   contact-v3.css — trang /lien-he (App học v3, 26/09/2026): dải teal + thẻ kênh liên hệ chồng lên dải, cột phụ (thông tin
   tài khoản để gửi kèm · câu hỏi hay gặp · góp ý). Nạp sau learn-ui.css + learn-hub.css. Chỉ token --lv-* / --color-*, không hex.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ═══ DẢI ═══ */
.ct3-band { --lv-band-pb: 118px; }
.ct3-hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 24px 40px; }
.ct3-hero .lv-band__context { max-width: 60ch; }
.ct3-stats { display: grid; grid-auto-flow: column; min-width: 0; margin: 0; }
.ct3-stat { padding: 16px 22px; min-width: 0; }
.ct3-stat + .ct3-stat { border-left: 1px solid var(--lv-line-d); }
.ct3-stat dt { font-size: 26px; line-height: 1.25; font-weight: 800; letter-spacing: -.02em; color: var(--lv-on); font-variant-numeric: tabular-nums; white-space: nowrap; }
.ct3-stat dd { margin: 4px 0 0; max-width: 18ch; font-size: 13px; line-height: 1.45; color: var(--lv-on-3); }

/* ═══ THÂN ═══ */
.ct3-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.ct3-main, .ct3-side { display: grid; gap: 20px; min-width: 0; }
.ct3-card { padding: 22px 24px 24px; }
.ct3-h { margin-bottom: 14px; }
.ct3-h h2 { font-size: 18.5px; line-height: 1.35; font-weight: 750; letter-spacing: -.015em; color: var(--lv-ink); }
.ct3-h p { margin-top: 4px; font-size: 14px; line-height: 1.55; color: var(--lv-muted); }
.ct3-main .ct3-h h2 { font-size: 21px; }

/* Kênh liên hệ */
.ct3-chs { list-style: none; margin: 0; padding: 0; display: grid; border: 1px solid var(--lv-hair); border-radius: 16px; overflow: hidden; }
.ct3-ch { display: grid; grid-template-columns: 48px minmax(0, 1fr) auto; align-items: center; gap: 16px; padding: 16px 18px; }
.ct3-ch + .ct3-ch { border-top: 1px solid var(--lv-hair); }
.ct3-ch--top { background: color-mix(in srgb, var(--color-primary) 6%, var(--lv-surface)); }
.ct3-ico { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; color: var(--lv-brand-deep);
  background: color-mix(in srgb, var(--color-primary) 12%, var(--lv-surface)); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-primary) 20%, transparent); }
.ct3-ico i { font-size: 19px; }
.ct3-ico--txt { font-size: 12.5px; font-weight: 800; letter-spacing: -.01em; }
.ct3-ch--top .ct3-ico { color: var(--lv-on); background: var(--lv-brand-strong); box-shadow: none; }
.ct3-ch__t { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; font-size: 16px; line-height: 1.4; font-weight: 750; color: var(--lv-ink); }
.ct3-ch__v { font-size: 14px; font-weight: 600; color: var(--lv-brand-fg); overflow-wrap: anywhere; }
.ct3-ch__d { margin-top: 3px; font-size: 14px; line-height: 1.55; color: var(--lv-muted); }
.ct3-badge { padding: 2px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 700; line-height: 1.5;
  color: var(--lv-brand-deep); background: color-mix(in srgb, var(--color-primary) 16%, var(--lv-surface)); }
.ct3-ch__acts { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.ct3-ch__acts .lv-btn { flex: none; }

/* Cột phụ */
.ct3-kv { margin: 0 0 16px; display: grid; gap: 0; border: 1px solid var(--lv-hair); border-radius: 14px; overflow: hidden; }
.ct3-kv > div { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 12px; padding: 11px 14px; }
.ct3-kv > div + div { border-top: 1px solid var(--lv-hair); }
.ct3-kv dt { font-size: 13.5px; line-height: 1.45; color: var(--lv-muted); }
.ct3-kv dd { margin: 0; font-size: 14px; line-height: 1.45; font-weight: 650; color: var(--lv-ink); overflow-wrap: anywhere; }
.ct3-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; counter-reset: ct3; }
.ct3-steps li { position: relative; padding-left: 36px; font-size: 14.5px; line-height: 1.55; color: var(--lv-text); counter-increment: ct3; }
.ct3-steps li::before { content: counter(ct3); position: absolute; left: 0; top: 0; width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center;
  font-size: 12.5px; font-weight: 800; line-height: 1; color: var(--lv-brand-deep); background: color-mix(in srgb, var(--color-primary) 14%, var(--lv-surface)); }
.ct3-links { list-style: none; margin: 0; padding: 0; display: grid; }
.ct3-links a { display: flex; align-items: center; min-height: 44px; padding: 8px 0; font-size: 14.5px; line-height: 1.45; font-weight: 600; color: var(--lv-ink); text-decoration: none; }
.ct3-links li + li a { border-top: 1px solid var(--lv-hair); }
.ct3-links a:hover { color: var(--lv-brand-fg); }
.ct3-more { display: inline-flex; align-items: center; min-height: 40px; margin-top: 6px; font-size: 14px; font-weight: 650; color: var(--lv-brand-fg); text-decoration: none; }
.ct3-more:hover { text-decoration: underline; text-underline-offset: 3px; }
.ct3-note { margin: -4px 0 14px; font-size: 14px; line-height: 1.55; color: var(--lv-muted); }
.ct3-fb { display: flex; align-items: center; justify-content: space-between; gap: 16px 24px; }
.ct3-fb .ct3-h { margin: 0; }
.ct3-fb .lv-btn { flex: none; }

@media (max-width: 960px) {
    .ct3-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 720px) {
    .ct3-hero { grid-template-columns: minmax(0, 1fr); }
    .ct3-stats { grid-auto-flow: row; grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .ct3-card { padding: 18px 16px 20px; }
    .ct3-main .ct3-h h2 { font-size: 19px; }
    .ct3-ch { grid-template-columns: 44px minmax(0, 1fr); gap: 12px 14px; padding: 14px; }
    .ct3-ico { width: 44px; height: 44px; border-radius: 12px; }
    .ct3-ch__acts { grid-column: 1 / -1; justify-content: stretch; }
    .ct3-ch__acts .lv-btn { flex: 1 1 auto; justify-content: center; }
    .ct3-kv > div { grid-template-columns: 96px minmax(0, 1fr); }
    .ct3-fb { flex-direction: column; align-items: stretch; }
    .ct3-fb .lv-btn { justify-content: center; }
}