:root {
  --paper: #f0f2ee;
  --cream: #f7f8f5;
  --stone: #e3e6e0;
  --ink: #161816;
  --muted: #5e665e;
  --line: #d2d6cf;
  --red: #8a1818;
  --red-deep: #641010;
  --green: #178c28;
  --green-deep: #127220;
  --gold: #c47a14;
  --dark: #121412;
  --dark-2: #1a1d1a;
  --white: #fcfdfb;
  --shadow: 0 20px 50px rgba(18, 28, 18, .08);
  --wrap: min(1160px, calc(100% - 48px));
  --radius: 6px;
  --topbar-h: 41px;
  --header-h: 92px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Be Vietnam Pro", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: -0.01em;
}
body.nav-open { overflow: hidden; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
.wrap { width: var(--wrap); margin-inline: auto; }
.skip {
  position: absolute; left: -999px; top: 0;
}
.skip:focus { left: 16px; top: 16px; z-index: 80; background: #fff; padding: 8px 12px; }

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 42;
  background: var(--dark);
  color: #d9d2c7;
  font-size: 12.5px;
  letter-spacing: .02em;
  border-bottom: 3px solid var(--green);
}
.topbar .wrap {
  display: flex; justify-content: space-between; gap: 16px;
  min-height: 38px; align-items: center;
}
.topbar a { color: #fff; font-weight: 600; }
.topbar a:hover { color: #b7e4bc; }

/* Header */
.site-header {
  position: sticky; top: var(--topbar-h); z-index: 41;
  background: rgba(247, 248, 245, .96);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; align-items: center; gap: 28px; height: 92px;
}
.brand { display: flex; align-items: center; gap: 14px; min-width: 260px; }
.brand img {
  width: 78px; height: 78px; flex: none;
  border-radius: 12px;
  background: var(--cream);
  object-fit: contain;
}
footer .brand img {
  background: #fff;
  border-color: #2a2622;
}
.brand strong { display: block; font-size: 15px; letter-spacing: .01em; }
.brand small {
  display: block; margin-top: 2px; color: var(--muted);
  font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; font-weight: 600;
}
.nav { display: flex; gap: 26px; margin-left: auto; font-size: 14px; font-weight: 600; }
.nav a { position: relative; padding: 6px 0; }
.nav a:hover, .nav a.is-active { color: var(--green-deep); }
.nav a.is-active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--green);
}
.header-cta { display: flex; gap: 8px; align-items: center; }
.nav-toggle {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line);
  background: var(--cream); border-radius: var(--radius); cursor: pointer; flex: none;
  place-items: center; font-size: 22px; line-height: 1; color: var(--ink);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 46px; padding: 0 18px; border-radius: var(--radius);
  border: 1px solid var(--ink); background: transparent; font-weight: 650;
  font-size: 14px; cursor: pointer; transition: .18s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-red { background: var(--red); border-color: var(--red); color: #fff; }
.btn-red:hover { background: var(--red-deep); border-color: var(--red-deep); }
.btn-dark { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn-light { background: var(--cream); border-color: var(--line); }
.btn-ghost { border-color: rgba(255,255,255,.28); color: #fff; }
.btn-ghost:hover { background: #fff; color: var(--ink); }

/* Hero */
.hero {
  padding: 56px 0 28px;
}
.hero-grid {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center;
}
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 11px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--green);
}
.kicker::before { content: ""; width: 22px; height: 1.5px; background: var(--green); }
h1, .h1 {
  font-size: clamp(40px, 5.4vw, 72px);
  line-height: .98; letter-spacing: -.045em; font-weight: 750; margin: 16px 0 18px;
}
.lede { font-size: 18px; color: var(--muted); max-width: 540px; margin: 0 0 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-meta {
  display: grid; grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 0; margin-top: 36px; border-top: 1px solid var(--line); padding-top: 18px;
}
.hero-meta b { display: block; font-size: 15px; }
.hero-meta span { color: var(--muted); font-size: 12.5px; }
.hero-visual {
  position: relative; min-height: 560px;
  background: linear-gradient(160deg, #1c241c, #121412 52%, #2a1614);
  border-radius: 8px; overflow: hidden;
}
.hero-visual img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain;
  padding: 36px 28px 72px; filter: drop-shadow(0 30px 40px rgba(0,0,0,.45));
}
.hero-badge {
  position: absolute; left: 18px; bottom: 18px; right: 18px;
  display: flex; justify-content: space-between; gap: 12px;
  color: #f3ebe3; font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
  border-top: 1px solid rgba(255,255,255,.14); padding-top: 12px;
}

/* Ticker */
.ticker {
  overflow: hidden; border-block: 1px solid var(--line); background: var(--cream);
  margin: 8px 0 0;
}
.ticker-track {
  display: flex; gap: 40px; width: max-content;
  animation: tick 28s linear infinite; padding: 14px 0; font-size: 13px;
  font-weight: 650; letter-spacing: .12em; text-transform: uppercase; color: var(--muted);
}
@keyframes tick { to { transform: translateX(-50%); } }

/* Sections */
section { padding: 84px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 32px; margin-bottom: 32px; }
.section-head h2 { margin: 8px 0 0; font-size: clamp(30px, 3.6vw, 46px); letter-spacing: -.04em; line-height: 1.08; max-width: 720px; }
.section-head p { margin: 0; color: var(--muted); max-width: 380px; }

.product-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
}
.card {
  background: var(--cream); border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
  display: flex; flex-direction: column; min-height: 100%;
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card-img {
  height: 220px; background:
    radial-gradient(circle at 50% 20%, #fff, var(--stone) 70%);
  display: grid; place-items: center; padding: 18px;
}
.card-img img { max-height: 190px; width: auto; object-fit: contain; }
.card-body { padding: 16px 16px 18px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.card-body .tag {
  font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--green);
}
.card-body h3 { margin: 0; font-size: 18px; letter-spacing: -.02em; }
.card-body p { margin: 0; color: var(--muted); font-size: 13.5px; }

/* Featured */
.featured {
  display: grid; grid-template-columns: .9fr 1.1fr; gap: 22px; align-items: stretch;
}
.featured-photo {
  background: #161a16; border-radius: 8px; min-height: 520px; position: relative; overflow: hidden;
}
.featured-photo img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; padding: 40px 30px;
  filter: drop-shadow(0 24px 40px rgba(0,0,0,.4));
}
.featured-copy {
  background: var(--cream); border: 1px solid var(--line); border-radius: 8px; padding: 40px 40px 36px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0; }
.chip {
  border: 1px solid var(--line); background: var(--paper); padding: 7px 11px;
  border-radius: 999px; font-size: 12.5px; font-weight: 600;
}
.specs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 8px 0 24px; }
.spec { background: var(--paper); padding: 14px; border-radius: 6px; }
.spec b { display: block; font-size: 18px; }
.spec span { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 700; }

/* Apps */
.apps { background: var(--dark); color: #f4efe6; }
.apps .section-head p, .apps .muted { color: #b7b0a6; }
.use-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.use {
  border: 1px solid #2c2824; background: var(--dark-2); padding: 22px; border-radius: 8px;
  min-height: 230px; display: flex; flex-direction: column; justify-content: space-between;
}
.use-no { font-size: 12px; letter-spacing: .16em; color: #7dce86; font-weight: 700; }
.use h3 { margin: 18px 0 8px; font-size: 22px; letter-spacing: -.02em; }
.use p { margin: 0; color: #b7b0a6; font-size: 14px; }
.use a { color: #c8e8cc; font-weight: 700; font-size: 14px; }
.use a:hover { color: #fff; }

/* Proof */
.proof { display: grid; grid-template-columns: 1fr; gap: 18px; }
.proof-card {
  background: var(--cream); border: 1px solid var(--line); border-radius: 8px; padding: 32px;
}
.proof-card.dark { background: var(--dark); color: #f4efe6; border-color: var(--dark); }
.proof-card h3 { font-size: 30px; letter-spacing: -.03em; line-height: 1.15; margin: 10px 0 18px; }
.check { display: flex; gap: 12px; margin: 12px 0; color: var(--muted); }
.proof-card.dark .check { color: #c9c2b8; }
.tick {
  width: 22px; height: 22px; flex: none; border: 1px solid currentColor;
  display: grid; place-items: center; font-size: 11px; margin-top: 2px;
}
.quote {
  margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line);
  font-size: 15px; font-style: italic;
}
.proof-card.dark .quote { border-color: #322d28; }

/* Process */
.process { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.step {
  padding: 24px;
  background: var(--cream);
  border: 1px solid var(--line);
  border-top: 3px solid var(--green);
}
.step b { display: block; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--green); margin-bottom: 10px; }
.step h3 { margin: 0 0 8px; font-size: 22px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

/* CTA */
.cta-band {
  background: var(--red); color: #fff; border-radius: 8px; padding: 42px 44px;
  display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center;
}
.cta-band h2 { margin: 0 0 8px; font-size: clamp(28px, 3vw, 40px); letter-spacing: -.03em; }
.cta-band p { margin: 0; opacity: .9; max-width: 640px; }
.cta-band .btn { background: #fff; color: var(--ink); border-color: #fff; }

/* Page hero */
.page-hero { padding: 48px 0 12px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(36px, 5vw, 60px); margin: 10px 0 12px; }
.crumb { font-size: 13px; color: var(--muted); }
.crumb a:hover { color: var(--green); }

/* Filters */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 28px 0 20px; }
.filter {
  height: 40px; padding: 0 14px; border: 1px solid var(--line); background: var(--cream);
  border-radius: 999px; cursor: pointer; font-weight: 650; font-size: 13.5px;
}
.filter.is-on, .filter:hover { background: var(--red); color: #fff; border-color: var(--red); }

/* Detail */
.detail {
  display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; padding: 40px 0 20px;
}
.detail-photo {
  background: linear-gradient(180deg, #fff, var(--stone));
  border: 1px solid var(--line); border-radius: 8px; min-height: 520px;
  display: grid; place-items: center; padding: 28px;
}
.detail-photo img { max-height: 480px; width: auto; object-fit: contain; }
.detail h1 { font-size: clamp(32px, 4vw, 48px); margin: 10px 0 12px; }
.detail .lede { font-size: 16.5px; }
.note {
  background: #eef6ee; border: 1px solid #c5ddc7; padding: 14px 16px; border-radius: 6px;
  font-size: 13.5px; margin: 18px 0;
}

/* About */
.about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: start; }
.about-grid .portrait {
  background: #1a1613; border-radius: 8px; overflow: hidden; min-height: 420px; position: relative;
}
.about-grid .portrait img {
  width: 100%; height: 100%; object-fit: cover; min-height: 420px; opacity: .92;
}
.prose p { color: #3f3a35; font-size: 16.5px; }
.prose ul { padding-left: 18px; color: #3f3a35; }
.prose li { margin: 8px 0; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: stretch;
}
.info-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}
.info-item { background: var(--cream); border: 1px solid var(--line); padding: 18px; border-radius: 8px; }
.info-item span { display: block; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 700; }
.info-item b { display: block; margin-top: 6px; font-size: 17px; }
.form {
  background: var(--cream); border: 1px solid var(--line); border-radius: 8px; padding: 28px;
}
.form h2 { margin: 0 0 8px; font-size: 28px; }
.form p { margin: 0 0 20px; color: var(--muted); }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 12.5px; font-weight: 700; letter-spacing: .04em; }
.field input, .field select, .field textarea {
  border: 1px solid var(--line); background: var(--white); border-radius: 4px;
  padding: 11px 12px; outline: none;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--ink); }
.form-ok {
  display: none; background: #eaf6ea; border: 1px solid #b7d7b7; color: #1d5c2a;
  padding: 12px 14px; border-radius: 6px; margin-bottom: 14px;
}
.map {
  margin: 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  min-height: 100%;
}
.map iframe { width: 100%; height: 420px; min-height: 420px; border: 0; display: block; }

/* Footer */
footer {
  background: var(--dark); color: #d8d2c8; padding: 48px 0 0; margin-top: 20px;
}
.foot {
  display: grid; grid-template-columns: 1.4fr repeat(3, .8fr); gap: 32px; padding-bottom: 36px;
}
.foot h4 {
  margin: 0 0 14px; font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: #fff;
}
.foot a, .foot p { color: #b8b1a7; font-size: 14px; }
.foot a { display: block; margin: 8px 0; }
.foot a:hover { color: #9ee0a6; }
.legal {
  border-top: 1px solid #2a2622; padding: 16px 0 22px;
  display: flex; justify-content: space-between; gap: 12px; font-size: 12.5px; color: #8d877e;
}

/* Float */
.float {
  position: fixed; right: 16px; bottom: 16px; z-index: 50;
  display: flex; flex-direction: column; gap: 8px;
}
.float a {
  width: 48px; height: 48px; border-radius: 50%; display: grid; place-items: center;
  color: #fff; font-size: 12px; font-weight: 800; box-shadow: 0 10px 24px rgba(0,0,0,.18);
}
.float .zalo { background: #0068ff; }
.float .phone { background: var(--red); }

/* Mobile nav panel */
.nav-panel {
  display: none; position: fixed;
  top: calc(var(--topbar-h) + var(--header-h));
  left: 0; right: 0; bottom: 0;
  background: var(--cream);
  padding: 28px 24px 32px; z-index: 40;
  flex-direction: column; gap: 8px;
  overflow: auto;
}
body.nav-open .nav-panel { display: flex; }
.nav-panel a {
  font-size: 20px; font-weight: 700; padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.nav-panel .btn { margin-top: 12px; border: 0; }

@media (max-width: 980px) {
  :root { --wrap: min(100% - 32px, 1160px); }
  .nav, .header-cta .btn-light { display: none; }
  .nav-toggle { display: grid; margin-left: auto; }
  .hero-grid, .featured, .proof, .about-grid, .contact-grid, .detail { grid-template-columns: 1fr; }
  .info-list { grid-template-columns: 1fr 1fr; }
  .hero-visual, .featured-photo, .detail-photo { min-height: 420px; }
  .product-grid { grid-template-columns: 1fr 1fr; }
  .use-grid, .process, .foot { grid-template-columns: 1fr 1fr; }
  .cta-band { grid-template-columns: 1fr; }
  .fields { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .topbar .addr { display: none; }
  .site-header .wrap { height: 80px; }
  :root { --header-h: 80px; }
  .brand { min-width: 0; }
  .brand img { width: 64px; height: 64px; }
  .brand small { display: none; }
  .header-cta { display: none; }
  h1, .h1 { font-size: 40px; }
  .hero { padding-top: 28px; }
  .hero-meta, .product-grid, .use-grid, .process, .specs, .foot, .legal, .info-list { grid-template-columns: 1fr; }
  .section-head { display: block; }
  .section-head p { margin-top: 10px; }
  section { padding: 64px 0; }
  .featured-copy, .cta-band, .form { padding: 24px; }
  .legal span + span { margin-top: 6px; }
}