/* AI Coach 360 - hướng B "Premium Athletic": nền trắng, chữ đen, nhấn cam, thẻ ảnh tối bo góc. */
:root {
  --bg: #FFFFFF;
  --bg-soft: #F6F5F2;
  --ink: #111111;
  --muted: #5E5E5E;
  --line: #E4E2DD;
  --orange: #F28C28;
  --orange-2: #F26522;
  --dark: #0E0E0E;
  --r: 20px;
  --r-sm: 16px;
  --wrap: 1240px;
  --gut: clamp(16px, 4vw, 40px);
  --font: "Inter Tight", "Be Vietnam Pro", "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 17px/1.55 var(--font); overflow-x: hidden; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: -0.03em; line-height: 1.04; text-wrap: balance; }
p { margin: 0; }
.wrap { width: 100%; max-width: calc(var(--wrap) + 2 * var(--gut)); margin-inline: auto; padding-inline: var(--gut); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 50; background: var(--ink); color: #fff; padding: 12px 16px; border-radius: 10px; }
.skip:focus { top: 12px; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }

/* ---------- Nút ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; text-align: center; min-height: 48px; padding: 0 28px; border-radius: 999px; border: 0; font: 600 16px/1.25 var(--font); text-decoration: none; cursor: pointer; transition: transform .2s ease, background-color .2s ease; }
.btn:active { transform: scale(.98); }
.btn-hero { background: var(--orange); color: var(--ink); min-height: 58px; padding: 0 34px; font-size: 17px; }
.btn-hero:hover { background: #F59B3E; }

/* ---------- Nav ---------- */
.nav { position: sticky; top: 0; z-index: 30; background: rgba(255,255,255,.92); backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px); }
.nav-in { position: relative; display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { font-size: 30px; font-weight: 500; letter-spacing: -0.035em; text-decoration: none; white-space: nowrap; }
.brand b { font-weight: 800; }
.nav-links { display: flex; gap: 44px; list-style: none; margin: 0; padding: 0; }
.nav-links a { display: inline-flex; align-items: center; min-height: 44px; font-size: 18px; font-weight: 500; text-decoration: none; }
.nav-links a:hover { color: var(--orange-2); }
.menu-btn { display: none; width: 48px; height: 48px; border: 0; background: none; padding: 14px 9px; cursor: pointer; flex-direction: column; justify-content: space-between; }
.menu-btn span { display: block; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .25s ease, opacity .2s; }
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { padding-top: 12px; padding-bottom: 130px; }
.hero-card { position: relative; min-height: 620px; border-radius: var(--r); background: var(--dark); color: #fff; display: flex; align-items: center; }
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 60% 30%; border-radius: var(--r); }
.hero-card::before { content: ""; position: absolute; inset: 0; border-radius: var(--r); z-index: 1; background: linear-gradient(90deg, rgba(8,8,8,.94) 0%, rgba(8,8,8,.8) 40%, rgba(8,8,8,.3) 72%, rgba(8,8,8,.15) 100%); }
.hero-copy { position: relative; z-index: 2; max-width: 660px; padding: 72px 24px 72px clamp(28px, 4.5vw, 72px); }
.hero h1 { font-size: clamp(44px, 6vw, 86px); line-height: 1; }
.hero-sub { margin-top: 24px; font-size: clamp(17px, 1.6vw, 22px); color: rgba(255,255,255,.86); max-width: 34ch; }
.hero-actions { margin-top: 38px; display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.link-demo { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; padding: 0 18px; margin-left: 12px; color: #fff; font-size: 17px; font-weight: 500; text-decoration: none; }
.link-demo:hover { text-decoration: underline; text-underline-offset: 4px; }

/* Điện thoại (khung CSS) */
.phone { position: absolute; z-index: 3; right: clamp(24px, 4.5vw, 70px); top: 62px; margin: 0; width: 300px; aspect-ratio: 300 / 620; padding: 11px; border-radius: 48px; background: #1A1A1A; box-shadow: 0 0 0 2px #3A3A3A, 0 40px 80px -20px rgba(0,0,0,.45); }
.phone-screen { position: relative; height: 100%; border-radius: 38px; overflow: hidden; background: #151515; }
.phone-shot { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 50% 40%; filter: brightness(.85); }
.phone-status { position: absolute; top: 0; left: 0; right: 0; height: 40px; display: flex; align-items: center; justify-content: space-between; padding: 0 22px; font-size: 14px; font-weight: 600; color: #fff; z-index: 2; }
.island { width: 84px; height: 24px; border-radius: 14px; background: #000; }
.bars { width: 24px; height: 11px; border-radius: 3px; border: 1.5px solid #fff; }
.phone-hud { position: absolute; z-index: 2; top: 42px; left: 0; right: 0; display: flex; justify-content: space-between; align-items: flex-start; padding: 6px 18px 22px; background: linear-gradient(rgba(10,10,10,.88), rgba(10,10,10,0)); color: #fff; }
.rep { display: flex; flex-direction: column; line-height: .9; }
.rep b { font-size: 84px; font-weight: 800; color: var(--orange); letter-spacing: -0.04em; }
.rep span { font-size: 14px; color: rgba(255,255,255,.8); margin-top: 4px; }
.score { position: relative; width: 84px; display: grid; justify-items: center; text-align: center; }
.score svg { width: 70px; height: 70px; transform: rotate(-90deg); }
.score circle { fill: none; stroke-width: 3.5; }
.ring-bg { stroke: rgba(255,255,255,.18); }
.ring { stroke: var(--orange); stroke-linecap: round; }
.score b { position: absolute; top: 17px; left: 0; right: 0; font-size: 26px; font-weight: 700; }
.score span { margin-top: 4px; font-size: 14px; white-space: nowrap; }
.pose { position: absolute; z-index: 1; left: 8%; top: 27%; width: 84%; height: auto; }
.bones polyline { fill: none; stroke: var(--orange); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; filter: drop-shadow(0 0 4px rgba(242,140,40,.8)); }
.joints circle { fill: #fff; stroke: var(--orange); stroke-width: 2.5; }
.joints .head { fill: none; }
.phone-bar { position: absolute; z-index: 2; left: 0; right: 0; bottom: 0; height: 96px; display: flex; align-items: center; justify-content: center; gap: 12px; padding-bottom: 14px; background: linear-gradient(rgba(10,10,10,0), rgba(10,10,10,.95) 40%); }
.pb-ic { width: 34px; height: 34px; border-radius: 50%; background: rgba(255,255,255,.14); display: grid; place-items: center; font-style: normal; }
.pb-ic svg { width: 18px; height: 18px; fill: #fff; stroke: #fff; stroke-width: 1.6; stroke-linecap: round; }
.pb-stop { width: 50px; height: 50px; border-radius: 50%; border: 2.5px solid #fff; display: grid; place-items: center; }
.pb-stop b { width: 16px; height: 16px; border-radius: 3px; background: var(--orange); }
.wave { display: flex; align-items: center; gap: 3px; height: 26px; }
.wave i { width: 2.5px; background: var(--orange); border-radius: 2px; height: 40%; animation: wave 1.1s ease-in-out infinite; }
.wave i:nth-child(2n) { animation-delay: -.3s; height: 80%; }
.wave i:nth-child(3n) { animation-delay: -.6s; height: 60%; }
.wave i:nth-child(5n) { background: rgba(255,255,255,.5); }
@keyframes wave { 50% { transform: scaleY(.4); } }

/* Thanh CTA dính đáy (chỉ điện thoại) */
.dock { display: none; }

/* ---------- Khối chung ---------- */
section { scroll-margin-top: 84px; }
.lead { margin-top: 18px; font-size: 18px; color: var(--muted); max-width: 46ch; }
.has-reveal .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.has-reveal .reveal.is-in { opacity: 1; transform: none; }

/* ---------- Tính năng + demo ---------- */
.features { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; padding-top: 40px; padding-bottom: 120px; }
.feat-photo { margin: 0; border-radius: var(--r); overflow: hidden; background: linear-gradient(135deg, #222, #0b0b0b); aspect-ratio: 16 / 5.2; }
.feat-photo img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 45%; }
.features h2 { margin-top: 40px; font-size: clamp(48px, 6vw, 92px); line-height: .95; }
.feat-cards { list-style: none; margin: 40px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feat-card { border: 1px solid var(--line); border-radius: var(--r-sm); padding: 24px 20px 22px; background: #fff; }
.feat-card .ic { width: 48px; height: 48px; fill: none; stroke: var(--ink); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.feat-card .ic-o { stroke: var(--orange-2); fill: rgba(242,140,40,.25); }
.feat-card h3 { margin-top: 22px; font-size: 21px; font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; }
.feat-card p { margin-top: 8px; font-size: 15px; color: var(--muted); line-height: 1.5; }
.demo { margin: 0; background: var(--bg-soft); border-radius: var(--r); padding: 22px 20px 20px; position: sticky; top: 96px; }
.demo-label { font-size: 20px; font-weight: 500; margin-bottom: 16px; }
.demo-frame { position: relative; border-radius: var(--r-sm); overflow: hidden; background: #1a1a1a; aspect-ratio: 4 / 3.4; }
.demo-frame img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 55%; }
.hotspot { position: absolute; left: 44%; top: 50%; width: 30px; height: 30px; margin: -15px 0 0 -15px; border-radius: 50%; background: var(--orange-2); box-shadow: 0 0 0 10px rgba(242,101,34,.35), 0 0 0 22px rgba(242,101,34,.15); animation: pulse 1.8s ease-out infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(242,101,34,.55), 0 0 0 0 rgba(242,101,34,.25); } 100% { box-shadow: 0 0 0 18px rgba(242,101,34,0), 0 0 0 34px rgba(242,101,34,0); } }
.bubble { position: absolute; right: 18px; top: 22px; display: flex; align-items: center; gap: 10px; background: #fff; color: var(--ink); padding: 12px 20px; border-radius: 999px; font-size: 17px; font-weight: 500; box-shadow: 0 10px 30px -10px rgba(0,0,0,.4); }
.bubble::after { content: ""; position: absolute; left: 22px; bottom: -8px; border: 8px solid transparent; border-top-color: #fff; border-bottom: 0; }
.bubble svg { width: 22px; height: 22px; fill: var(--ink); stroke: var(--ink); stroke-width: 1.8; stroke-linecap: round; }
.demo-note { margin-top: 14px; font-size: 14px; color: var(--muted); }

/* ---------- Môn tập + số liệu ---------- */
.sports { padding-bottom: 120px; }
.banner { position: relative; border-radius: var(--r); overflow: hidden; background: linear-gradient(120deg, #161616, #050505); color: #fff; min-height: 380px; display: flex; align-items: center; }
.banner img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 75% 35%; }
.banner::before { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(90deg, rgba(5,5,5,.95) 0%, rgba(5,5,5,.8) 45%, rgba(5,5,5,.2) 80%); }
.banner-copy { position: relative; z-index: 2; padding: 56px clamp(24px, 6vw, 88px); max-width: 860px; }
.banner-title { font-size: clamp(36px, 5vw, 70px); font-weight: 800; text-transform: uppercase; letter-spacing: -0.035em; line-height: .98; }
.banner-sub { margin-top: 18px; font-size: clamp(16px, 1.5vw, 20px); color: rgba(255,255,255,.85); }
.btn-small { margin-top: 24px; min-height: 44px; padding: 0 24px; background: var(--orange); color: var(--ink); font-size: 15px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.btn-small:hover { background: #F59B3E; }
.sports h2 { margin-top: 64px; font-size: clamp(40px, 4.6vw, 64px); }
.sport-cards { list-style: none; margin: 28px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.sport { position: relative; border-radius: var(--r); overflow: hidden; aspect-ratio: 4 / 3.3; background: linear-gradient(160deg, #2a2a2a, #0d0d0d); box-shadow: 0 18px 40px -22px rgba(0,0,0,.45); }
.sport img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 30%; transition: transform .6s cubic-bezier(.2,.7,.2,1); }
.sport:hover img { transform: scale(1.04); }
.sport::after { content: ""; position: absolute; inset: 0; background: linear-gradient(rgba(0,0,0,0) 45%, rgba(0,0,0,.82)); }
.sport div { position: absolute; z-index: 1; left: 0; right: 0; bottom: 0; padding: 18px 20px; color: #fff; text-align: center; }
.sport h3 { font-size: clamp(24px, 2.4vw, 34px); }
.sport p { margin-top: 4px; font-size: 14px; color: rgba(255,255,255,.82); }
.stats { margin: 40px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); background: var(--dark); color: #fff; border-radius: var(--r); padding: 26px 24px; }
.stat { display: flex; align-items: center; justify-content: center; gap: 16px; padding: 4px 16px; }
.stat + .stat { border-left: 1.5px solid rgba(255,255,255,.55); }
.stat dd { margin: 0; font-size: clamp(56px, 6vw, 84px); font-weight: 800; letter-spacing: -0.04em; line-height: 1; color: var(--orange); font-variant-numeric: tabular-nums; }
.stat dt { font-size: clamp(18px, 2vw, 28px); font-weight: 700; line-height: 1.05; letter-spacing: -0.02em; max-width: 7em; }
.stat { flex-direction: row; }
.stat dd { order: -1; }

/* ---------- Form + FAQ ---------- */
.final { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding-top: 40px; padding-bottom: 120px; }
.signup h2 { font-size: clamp(48px, 6.4vw, 96px); line-height: .94; }
.signup-form { margin-top: 32px; display: grid; gap: 14px; }
.signup-form input { width: 100%; min-height: 64px; padding: 0 22px; border: 2px solid var(--orange); border-radius: 12px; font: 400 20px/1 var(--font); color: var(--ink); background: #fff; }
.signup-form input::placeholder { color: #8A8A8A; }
.signup-form input:focus { outline: none; box-shadow: 0 0 0 4px rgba(242,140,40,.25); }
.signup-form input[aria-invalid="true"] { border-color: #D93025; }
.btn-submit { min-height: 64px; border-radius: 12px; background: var(--orange); color: var(--ink); font-size: 22px; font-weight: 800; letter-spacing: -0.02em; }
.btn-submit:hover { background: #F59B3E; }
.form-msg { font-size: 15px; min-height: 0; }
.form-msg:empty { display: none; }
.form-msg.is-error { color: #C5221F; }
.form-msg.is-ok { color: #1E7B34; font-weight: 600; }
.form-note { font-size: 18px; color: var(--ink); }
.faq { display: grid; gap: 18px; }
.faq-item { background: var(--dark); color: #fff; border: 2px solid var(--orange); border-radius: 12px; }
.faq-item summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 104px; padding: 22px 32px; font-size: clamp(20px, 2.4vw, 32px); font-weight: 700; letter-spacing: -0.03em; line-height: 1.15; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary i { flex: none; width: 14px; height: 14px; border-right: 3px solid var(--orange); border-bottom: 3px solid var(--orange); transform: rotate(-45deg); transition: transform .25s ease; }
.faq-item[open] summary i { transform: rotate(45deg); }
.faq-item p { padding: 0 32px 26px; font-size: 16px; line-height: 1.6; color: rgba(255,255,255,.82); }

/* ---------- Footer ---------- */
.footer { background: #000; color: #fff; }
.footer-in { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 40px; padding-top: 34px; padding-bottom: 34px; }
.brand-foot { font-size: 32px; }
.footer-links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; align-items: center; }
.footer-links li { display: flex; align-items: center; font-size: 18px; color: rgba(255,255,255,.9); }
.footer-links li + li::before { content: "·"; padding: 0 10px; color: rgba(255,255,255,.6); }
.footer-links a, .footer-links span { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; }
.footer-links a:hover { text-decoration: underline; text-underline-offset: 4px; }
.copy { margin-left: auto; font-size: 14px; color: rgba(255,255,255,.6); }

/* ---------- Máy tính bảng ---------- */
@media (max-width: 1100px) {
  .phone { width: 260px; }
  .hero-copy { max-width: 560px; }
  .features, .final { grid-template-columns: 1fr; }
  .demo { position: static; }
  .sport-cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .hero-card { min-height: 560px; }
  .phone { display: none; }
}

/* ---------- Điện thoại (mẫu B2) ---------- */
@media (max-width: 720px) {
  body { font-size: 16px; padding-bottom: 92px; }
  .nav-in { height: 64px; }
  .brand { font-size: 26px; }
  .menu-btn { display: flex; }
  .nav nav { position: absolute; left: 0; right: 0; top: 64px; background: #fff; border-bottom: 1px solid var(--line); display: none; }
  .nav.is-open nav { display: block; }
  .nav-links { flex-direction: column; gap: 0; padding: 8px var(--gut) 16px; }
  .nav-links a { min-height: 52px; font-size: 20px; width: 100%; }

  .hero { padding-top: 24px; padding-bottom: 72px; }
  .hero-card { display: block; min-height: 0; background: none; color: var(--ink); border-radius: 0; }
  .hero-card::before, .hero-bg { display: none; }
  .hero-copy { padding: 0; }
  .hero h1 { font-size: clamp(42px, 12.4vw, 56px); line-height: .98; }
  .hero-sub { color: var(--muted); font-size: 17px; margin-top: 16px; }
  .hero-actions { display: none; }
  .phone { display: block; position: relative; right: auto; top: auto; margin: 36px auto 0; width: min(76vw, 300px); }
  .rep b { font-size: 64px; }

  .features { padding-top: 0; padding-bottom: 80px; gap: 40px; }
  .features h2 { margin-top: 28px; font-size: 52px; }
  .lead { font-size: 17px; }
  .feat-cards { grid-template-columns: 1fr; gap: 12px; margin-top: 28px; }
  .feat-card { display: grid; grid-template-columns: 48px 1fr; column-gap: 16px; padding: 18px; }
  .feat-card .ic { grid-row: span 2; }
  .feat-card h3 { margin-top: 0; font-size: 19px; }
  .feat-card p { margin-top: 2px; }
  .feat-photo { aspect-ratio: 16 / 8; }
  .demo { padding: 18px 14px 16px; }
  .bubble { right: 12px; top: 14px; font-size: 15px; padding: 10px 16px; }

  .sports { padding-bottom: 80px; }
  .banner { min-height: 420px; align-items: flex-end; }
  .banner::before { background: linear-gradient(rgba(5,5,5,.2) 0%, rgba(5,5,5,.9) 55%); }
  .banner-copy { padding: 28px 22px; }
  .sports h2 { margin-top: 48px; font-size: 40px; }
  .sport-cards { gap: 12px; }
  .sport { aspect-ratio: 3 / 4; border-radius: var(--r-sm); }
  .sport div { padding: 12px; }
  .sport h3 { font-size: 22px; }
  .stats { grid-template-columns: 1fr; padding: 8px 20px; }
  .stat { justify-content: flex-start; padding: 16px 4px; }
  .stat + .stat { border-left: 0; border-top: 1px solid rgba(255,255,255,.3); }
  .stat dd { font-size: 56px; min-width: 1.6em; }
  .stat dt { font-size: 22px; max-width: none; }

  .final { padding-top: 0; padding-bottom: 72px; gap: 40px; }
  .signup h2 { font-size: 50px; }
  .faq-item summary { min-height: 76px; padding: 18px 20px; font-size: 21px; }
  .faq-item p { padding: 0 20px 20px; }
  .footer-in { flex-direction: column; align-items: flex-start; gap: 8px; }
  .copy { margin-left: 0; }

  .dock { display: block; position: fixed; z-index: 40; left: 0; right: 0; bottom: 0; padding: 12px var(--gut) calc(12px + env(safe-area-inset-bottom)); background: linear-gradient(rgba(255,255,255,0), #fff 35%); transition: transform .3s ease, opacity .3s ease; }
  .dock.is-hidden { transform: translateY(110%); opacity: 0; }
  .btn-dock { width: 100%; min-height: 58px; border-radius: 14px; background: var(--orange-2); color: #fff; font-size: 19px; font-weight: 700; }
}

/* ---------- Sửa sau vòng chụp round0 ---------- */
.features { grid-template-columns: 1.15fr .85fr; }
.feat-card { padding: 22px 18px 20px; }
.feat-card h3 { font-size: 19px; }
.banner-title { line-height: 1.06; }
.signup h2 { line-height: 1; }
.signup .lead { margin-top: 22px; }
@media (max-width: 1100px) { .features { grid-template-columns: 1fr; } }
@media (max-width: 720px) {
  .hero h1 { line-height: 1.04; }
  .banner-title { font-size: 32px; line-height: 1.16; letter-spacing: -0.02em; }
  .stat { gap: 18px; }
  .stat dd { min-width: 1.3em; font-size: 52px; }
  .footer-links { flex-direction: column; align-items: flex-start; }
  .footer-links li + li::before { content: none; }
  .signup h2, .features h2 { line-height: 1.02; }
}

/* ---------- Vòng 1: ảnh thể thao thật (cắt từ mẫu B) ---------- */
/* Ảnh màn hình điện thoại đã có khung xương: nằm giữa dải HUD trên và thanh điều khiển dưới như B1. */
.phone-shot { inset: 150px 0 auto 0; height: calc(100% - 246px); filter: none; object-position: 50% 30%; }
.pose { display: none; }
.phone-hud { background: #151515; padding-bottom: 14px; }
.hero-bg { object-position: 50% 40%; }
.demo-frame { aspect-ratio: 876 / 518; }
.demo-frame img { object-position: 50% 50%; }
.hotspot { left: 49.5%; top: 36%; background: transparent; }
.bubble { top: 6%; right: 2.4%; }
.banner img { object-position: 100% 40%; }
.sport img { object-position: 50% 35%; }
@media (max-width: 720px) {
  .phone-shot { top: 136px; height: calc(100% - 226px); }
  .bubble { top: 5%; }
}
/* Vòng 1: khớp tỉ lệ khối theo mẫu B3/B4 */
.features { grid-template-columns: 1fr 1fr; }
.feat-card .ic { width: 60px; height: 60px; stroke-width: 2; }
.feat-card h3 { font-weight: 500; font-size: 21px; }
.sport h3 { font-size: clamp(26px, 2.6vw, 38px); }
.sport-cards { gap: 28px; }
@media (max-width: 1100px) { .features { grid-template-columns: 1fr; } }
@media (max-width: 720px) {
  .phone { width: min(72vw, 280px); }
  .feat-card .ic { width: 48px; height: 48px; }
  .sport h3 { font-size: 22px; }
}

/* ---------- Vòng 2: khớp sát mẫu B (chữ grotesk chặt, tiêu đề 2 dòng, điện thoại chồng mép, banner dẹt) ---------- */
h1, h2, h3, .banner-title { letter-spacing: -0.028em; word-spacing: .06em; }
.brand { letter-spacing: -0.02em; display: inline-flex; align-items: center; min-height: 44px; }
.hero-card { min-height: 600px; }
.hero-copy { max-width: 780px; padding-top: 64px; padding-bottom: 64px; }
.hero h1 { font-size: clamp(44px, 6.3vw, 92px); line-height: .98; }
.hero-sub { max-width: 40ch; }
.btn-hero { font-weight: 600; }
.phone { top: 66px; width: 296px; }
.hero { padding-bottom: 150px; }
/* B3: chữ thẻ tính năng to, icon trên - nhãn dưới; demo cao bằng cột trái */
.features { gap: 40px; }
.features h2 { margin-top: 44px; font-size: clamp(52px, 6.4vw, 96px); line-height: .94; }
.feat-cards { margin-top: 44px; gap: 18px; }
.feat-card { display: flex; flex-direction: column; justify-content: space-between; min-height: 196px; padding: 24px 22px 22px; }
.feat-card h3 { font-size: 24px; font-weight: 500; line-height: 1.15; letter-spacing: -0.02em; }
.demo-frame { aspect-ratio: 876 / 640; }
/* B4: banner dẹt kiểu dải, chữ hoa rất đậm */
.banner { min-height: 300px; }
.banner-copy { padding: 40px clamp(24px, 5.5vw, 72px); max-width: 900px; }
.banner-title { font-size: clamp(36px, 5.2vw, 74px); line-height: .96; }
.banner-sub { margin-top: 14px; }
.btn-small { margin-top: 18px; }
.sports h2 { margin-top: 44px; }
.sport { aspect-ratio: 1.22 / 1; }
.sport h3 { font-size: clamp(28px, 2.8vw, 40px); }
.sport::after { background: linear-gradient(rgba(0,0,0,0) 50%, rgba(0,0,0,.78)); }
.stats { margin-top: 28px; padding: 22px 24px; }
.stat dd { font-size: clamp(60px, 6.4vw, 92px); }
.stat dt { font-size: clamp(20px, 2.2vw, 32px); font-weight: 600; max-width: 6em; }
/* B5: tiêu đề form rất lớn, FAQ đen viền cam, footer đen chữ to */
.signup h2 { font-size: clamp(52px, 7vw, 104px); line-height: .92; }
.signup-form { margin-top: 36px; }
.form-note { font-size: 19px; }
.faq { gap: 16px; }
.faq-item summary { min-height: 110px; font-size: clamp(22px, 2.6vw, 34px); }
.footer-in { padding-top: 38px; padding-bottom: 38px; }
.brand-foot { font-size: 36px; }
.footer-links li { font-size: 19px; }
@media (max-width: 1100px) {
  .phone { width: 260px; }
  .feat-card { min-height: 0; }
}
@media (max-width: 720px) {
  .hero h1 { font-size: clamp(44px, 13.2vw, 60px); line-height: 1; }
  .hero-sub { display: none; }
  .hero-copy { padding: 0; max-width: none; }
  .phone { margin-top: 40px; width: min(74vw, 290px); }
  .features h2 { font-size: 54px; }
  .feat-card { display: grid; min-height: 0; }
  .feat-card h3 { font-size: 20px; align-self: center; }
  .banner { min-height: 380px; }
  .banner-title { font-size: 34px; line-height: 1.04; }
  .sport { aspect-ratio: 3 / 4; }
  .sport h3 { font-size: 22px; }
  .stat dd { font-size: 56px; }
  .stat dt { font-size: 22px; max-width: none; }
  .signup h2 { font-size: 54px; line-height: .96; }
  .faq-item summary { min-height: 76px; font-size: 21px; }
  .brand-foot { font-size: 30px; }
  .footer-links li { font-size: 17px; }
}