/* verix.vn — trang giới thiệu sản phẩm VERIX
   Màu lấy từ logo kim loại (verix-logo.svg) và bảng màu sáng của web_theme. */
:root {
  --white: #ffffff;
  --canvas: #f4f4f6;
  --sunken: #ebebee;
  --border: #dcdce1;
  --border-strong: #c8c8cd;
  --ink: #1d1c21;
  --ink-muted: #4b4a4f;
  --ink-subtle: #6a6970;
  --graphite: #2a292e;
  --steel: #9d9ca1;
  --silver: #c0c2c7;
  --primary: #1d3958;
  --primary-hover: #294a70;
  --accent: #34597d;
  --accent-subtle: #e7edf4;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(29, 28, 33, .06), 0 8px 24px rgba(29, 28, 33, .06);
  --wrap: 1160px;
  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--white);
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--primary); }
a:hover { color: var(--primary-hover); }
h1, h2, h3 { line-height: 1.25; margin: 0; color: var(--graphite); letter-spacing: -.01em; }
p { margin: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; z-index: 100; background: var(--white); padding: 8px 12px; }

/* ---------- Thanh trên: SÁNG ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar .wrap { display: flex; align-items: center; gap: 24px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--graphite); }
.brand img { width: 44px; height: auto; }
.brand-name { font-weight: 700; font-size: 20px; letter-spacing: .14em; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  text-decoration: none; color: var(--ink-muted); font-weight: 500; font-size: 15px;
  padding: 8px 12px; border-radius: 8px;
}
.nav a:hover { color: var(--graphite); background: var(--canvas); }

/* ---------- Nút ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px; border-radius: 10px; font-weight: 600; font-size: 15px;
  text-decoration: none; border: 1px solid transparent; white-space: nowrap;
  transition: background-color .15s, border-color .15s, color .15s;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-hover); color: var(--white); }
.btn-ghost { background: var(--white); color: var(--graphite); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--steel); color: var(--graphite); }
.btn-sm { padding: 9px 16px; font-size: 14px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(1200px 500px at 85% -10%, rgba(52, 89, 125, .10), transparent 60%),
    linear-gradient(180deg, #fafafb 0%, var(--canvas) 100%);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.hero .wrap {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
  padding-top: 88px; padding-bottom: 96px;
}
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent);
  background: var(--accent-subtle); padding: 6px 12px; border-radius: 999px; margin-bottom: 20px;
}
.hero h1 { font-size: clamp(32px, 4.6vw, 52px); font-weight: 700; }
.hero h1 .metal {
  background: linear-gradient(100deg, #2c2d31 0%, #65666f 45%, #8c8d94 60%, #2c2d31 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { margin-top: 20px; font-size: 18px; color: var(--ink-muted); max-width: 560px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero .note { margin-top: 18px; font-size: 14px; color: var(--ink-subtle); }

/* Ô minh hoạ: lưới phân hệ, không số liệu */
.mock {
  background: var(--white); border: 1px solid var(--border); border-radius: 18px;
  box-shadow: var(--shadow); overflow: hidden;
}
.mock-bar {
  display: flex; align-items: center; gap: 8px; padding: 12px 16px;
  border-bottom: 1px solid var(--border); background: linear-gradient(180deg, #fbfbfc, #f2f2f4);
}
.mock-bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--border-strong); }
.mock-bar span { margin-left: 8px; font-size: 13px; color: var(--ink-subtle); }
.mock-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; padding: 22px; }
.tile {
  display: flex; flex-direction: column; align-items: center; gap: 10px; text-align: center;
  padding: 16px 8px; border-radius: 12px; border: 1px solid var(--border); background: #fcfcfd;
  font-size: 13px; font-weight: 500; color: var(--ink-muted);
}
.tile .ic { width: 44px; height: 44px; }

/* Icon kim loại */
.ic {
  display: grid; place-items: center; border-radius: 12px;
  background: linear-gradient(145deg, #f3f3f5 0%, #d9dadf 55%, #c0c2c7 100%);
  border: 1px solid #c8c8cd; color: var(--primary);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .9);
}
.ic svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Mục ---------- */
section { scroll-margin-top: 72px; }
.section { padding: 96px 0; }
.section-alt { background: var(--canvas); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 760px; margin-bottom: 48px; }
.section-head h2 { font-size: clamp(26px, 3.2vw, 36px); font-weight: 700; }
.section-head p { margin-top: 14px; color: var(--ink-muted); font-size: 17px; }
.kicker { font-size: 13px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }

/* Lưới tính năng */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.card {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: border-color .15s, box-shadow .15s;
}
.card:hover { border-color: var(--border-strong); box-shadow: var(--shadow); }
.card .ic { width: 46px; height: 46px; margin-bottom: 18px; }
.card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.card p { color: var(--ink-muted); font-size: 15px; }

/* Ngành thép — dải nổi bật */
.feature-wide {
  grid-column: 1 / -1; display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: start;
  background: linear-gradient(120deg, #ffffff 0%, #f3f4f6 60%, #e7edf4 100%);
}
.feature-wide .ic { margin-bottom: 0; }
.feature-wide ul { margin: 12px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px 28px; }
.feature-wide li { position: relative; padding-left: 18px; color: var(--ink-muted); font-size: 15px; }
.feature-wide li::before { content: ""; position: absolute; left: 0; top: .62em; width: 8px; height: 2px; background: var(--steel); }

/* Điểm khác biệt */
.diffs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.diff {
  display: grid; grid-template-columns: auto 1fr; gap: 18px; padding: 28px;
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius);
}
.diff .num {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 700; font-size: 15px; color: var(--primary);
  background: var(--accent-subtle); border: 1px solid #cfdbe8;
}
.diff h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.diff p { color: var(--ink-muted); font-size: 15px; }

/* Liên hệ */
.contact {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center;
  padding: 48px; border-radius: 20px; border: 1px solid var(--border);
  background:
    radial-gradient(600px 300px at 100% 0%, rgba(52, 89, 125, .10), transparent 70%),
    linear-gradient(160deg, #ffffff 0%, var(--canvas) 100%);
}
.contact h2 { font-size: clamp(26px, 3vw, 34px); font-weight: 700; }
.contact p { margin-top: 12px; color: var(--ink-muted); }
.contact-list { display: grid; gap: 12px; }
.contact-item {
  display: flex; align-items: center; gap: 14px; padding: 16px 18px; border-radius: 12px;
  background: var(--white); border: 1px solid var(--border); text-decoration: none; color: var(--graphite);
  min-width: 0;
}
.contact-item:hover { border-color: var(--steel); color: var(--graphite); }
.contact-item .ic { width: 40px; height: 40px; flex: none; }
.contact-item small { display: block; font-size: 13px; color: var(--ink-subtle); }
.contact-item strong { display: block; font-weight: 600; overflow-wrap: anywhere; }

/* Chân trang */
.footer { border-top: 1px solid var(--border); background: var(--canvas); padding: 36px 0; font-size: 14px; color: var(--ink-subtle); }
.footer .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; }
.footer .brand img { width: 32px; }
.footer .brand-name { font-size: 16px; }
.footer a { color: var(--ink-muted); }
.footer a:hover { color: var(--primary); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .features { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 40px; padding-top: 56px; padding-bottom: 64px; }
  .diffs { grid-template-columns: 1fr; }
  .contact { grid-template-columns: 1fr; padding: 32px; }
  .nav { display: none; }
  .topbar .btn { margin-left: auto; }
}
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  .section { padding: 64px 0; }
  .features { grid-template-columns: 1fr; }
  .feature-wide { grid-template-columns: 1fr; gap: 16px; }
  .feature-wide ul { grid-template-columns: 1fr; }
  .mock-grid { gap: 10px; padding: 14px; }
  .tile { padding: 12px 4px; font-size: 12px; }
  .hero .lead { font-size: 16px; }
  .hero .actions .btn { flex: 1 1 100%; }
  .diff { padding: 22px; gap: 14px; }
  .contact { padding: 24px 18px; }
  .footer .wrap { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}