/* Bannery marketing site — CSS thuần, không framework, dùng chung cho mọi trang. */

:root {
  --bn-ink: #14151a;
  --bn-ink-soft: #4b4f5b;
  --bn-muted: #6f7482;
  --bn-paper: #ffffff;
  --bn-paper-alt: #f7f7fb;
  --bn-accent: #ff5a36;
  --bn-accent-dark: #e2431f;
  --bn-accent-soft: #fff1ec;
  --bn-border: #e6e7ee;
  --bn-border-soft: #f0f1f5;
  --bn-radius: 14px;
  --bn-radius-sm: 8px;
  --bn-shadow-sm: 0 1px 3px rgba(20, 21, 26, .08), 0 1px 2px rgba(20, 21, 26, .05);
  --bn-shadow: 0 4px 16px rgba(20, 21, 26, .10), 0 1px 4px rgba(20, 21, 26, .06);
  --bn-shadow-lg: 0 16px 48px rgba(20, 21, 26, .14), 0 4px 12px rgba(20, 21, 26, .08);
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--bn-ink-soft);
  background: var(--bn-paper);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: var(--bn-accent-dark); }

.bn-container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ── Header ─────────────────────────────────────────── */
.bn-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--bn-border-soft);
}
.bn-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; max-width: 1160px; margin: 0 auto;
}
.bn-logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 800; font-size: 19px; color: var(--bn-ink);
  text-decoration: none; letter-spacing: -.3px;
}
.bn-logo-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--bn-accent), #ff8a5b);
  display: inline-block;
}
.bn-nav-links {
  display: flex; align-items: center; gap: 28px;
  list-style: none; margin: 0; padding: 0;
}
.bn-nav-links a {
  color: var(--bn-ink-soft); text-decoration: none;
  font-size: 14px; font-weight: 500;
}
.bn-nav-links a:hover { color: var(--bn-ink); }
.bn-nav-cta { display: flex; align-items: center; gap: 12px; }
.bn-nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 6px; color: var(--bn-ink);
}
.bn-nav-toggle svg { width: 24px; height: 24px; }

.bn-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: inherit; font-size: 14px; font-weight: 600;
  padding: 10px 18px; border-radius: var(--bn-radius-sm);
  text-decoration: none; cursor: pointer; border: 1.5px solid transparent;
  transition: opacity .15s, transform .1s, border-color .15s, box-shadow .15s;
}
.bn-btn:hover { transform: translateY(-1px); }
.bn-btn-primary { background: var(--bn-accent); color: #fff; }
.bn-btn-primary:hover { background: var(--bn-accent-dark); color: #fff; }
.bn-btn-outline { background: #fff; color: var(--bn-ink); border-color: var(--bn-border); }
.bn-btn-outline:hover { border-color: var(--bn-ink); box-shadow: var(--bn-shadow-sm); }
.bn-btn-lg { font-size: 16px; padding: 13px 26px; }

/* ── Hero ───────────────────────────────────────────── */
.bn-hero {
  padding: 96px 24px 72px;
  background: radial-gradient(circle at 80% 0%, var(--bn-accent-soft), transparent 55%);
  text-align: center;
}
.bn-hero-badge {
  display: inline-block; font-size: 12px; font-weight: 700;
  letter-spacing: .4px; text-transform: uppercase;
  color: var(--bn-accent-dark); background: var(--bn-accent-soft);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 20px;
}
.bn-hero h1 {
  font-size: clamp(32px, 5vw, 56px); font-weight: 800;
  color: var(--bn-ink); letter-spacing: -1px; line-height: 1.1;
  max-width: 800px; margin: 0 auto 20px;
}
.bn-hero p {
  font-size: 18px; color: var(--bn-muted);
  max-width: 560px; margin: 0 auto 32px;
}
.bn-hero-cta { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.bn-hero-note { margin-top: 16px; font-size: 13px; color: var(--bn-muted); }

.bn-hero-mock {
  max-width: 880px; margin: 56px auto 0;
  border-radius: var(--bn-radius); overflow: hidden;
  box-shadow: var(--bn-shadow-lg); border: 1px solid var(--bn-border);
}
.bn-hero-mock-bar {
  background: var(--bn-ink); padding: 40px 32px;
  display: flex; align-items: center; justify-content: center;
}
.bn-hero-mock-banner {
  width: 100%; max-width: 640px; border-radius: 10px;
  background: linear-gradient(120deg, var(--bn-accent), #ff8a5b 60%, #ffd166);
  color: #fff; padding: 22px 28px; text-align: left;
  font-weight: 700; font-size: 18px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, .25);
}
.bn-hero-mock-banner span { display: block; font-size: 13px; font-weight: 500; opacity: .85; margin-top: 4px; }

/* ── Section shells ─────────────────────────────────── */
.bn-section { padding: 80px 24px; }
.bn-section-alt { background: var(--bn-paper-alt); }
.bn-section-head { text-align: center; max-width: 620px; margin: 0 auto 48px; }
.bn-eyebrow {
  font-size: 12px; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; color: var(--bn-accent-dark); margin-bottom: 10px;
}
.bn-section-head h2 {
  font-size: clamp(26px, 3vw, 36px); font-weight: 800;
  color: var(--bn-ink); letter-spacing: -.5px; margin: 0 0 12px;
}
.bn-section-head p { color: var(--bn-muted); font-size: 16px; margin: 0; }

/* ── Feature grid ───────────────────────────────────── */
.bn-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  max-width: 1160px; margin: 0 auto;
}
.bn-card {
  background: #fff; border: 1px solid var(--bn-border);
  border-radius: var(--bn-radius); padding: 28px;
}
.bn-card-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--bn-accent-soft); color: var(--bn-accent-dark);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px; font-size: 20px;
}
.bn-card h3 { font-size: 17px; font-weight: 700; color: var(--bn-ink); margin: 0 0 8px; }
.bn-card p { font-size: 14px; color: var(--bn-muted); margin: 0; }

/* ── Steps ──────────────────────────────────────────── */
.bn-steps {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  max-width: 1160px; margin: 0 auto; counter-reset: bn-step;
}
.bn-step { text-align: center; }
.bn-step-num {
  width: 36px; height: 36px; border-radius: 999px;
  background: var(--bn-ink); color: #fff; font-weight: 700; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}
.bn-step h3 { font-size: 16px; font-weight: 700; color: var(--bn-ink); margin: 0 0 6px; }
.bn-step p { font-size: 14px; color: var(--bn-muted); margin: 0; }

/* ── CTA band ───────────────────────────────────────── */
.bn-cta-band {
  background: var(--bn-ink); border-radius: var(--bn-radius);
  padding: 56px 40px; text-align: center; max-width: 1160px; margin: 0 auto;
}
.bn-cta-band h2 { color: #fff; font-size: 28px; font-weight: 800; margin: 0 0 12px; }
.bn-cta-band p { color: #c7c9d4; margin: 0 0 28px; }

/* ── Footer ─────────────────────────────────────────── */
.bn-footer { border-top: 1px solid var(--bn-border-soft); padding: 56px 24px 32px; }
.bn-footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
  max-width: 1160px; margin: 0 auto 40px;
}
.bn-footer-grid h6 {
  font-size: 12px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .5px; color: var(--bn-ink); margin: 0 0 14px;
}
.bn-footer-grid ul { list-style: none; margin: 0; padding: 0; }
.bn-footer-grid li { margin-bottom: 10px; }
.bn-footer-grid a { color: var(--bn-muted); text-decoration: none; font-size: 14px; }
.bn-footer-grid a:hover { color: var(--bn-ink); }
.bn-footer-bottom {
  max-width: 1160px; margin: 0 auto; padding-top: 24px;
  border-top: 1px solid var(--bn-border-soft);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
  font-size: 13px; color: var(--bn-muted);
}

/* ── Legal pages (privacy / terms) ─────────────────── */
.bn-legal { padding: 64px 24px 96px; }
.bn-legal-inner { max-width: 720px; margin: 0 auto; }
.bn-legal h1 { font-size: 32px; font-weight: 800; color: var(--bn-ink); margin: 0 0 8px; }
.bn-legal-updated { color: var(--bn-muted); font-size: 14px; margin: 0 0 40px; }
.bn-legal h2 { font-size: 20px; font-weight: 700; color: var(--bn-ink); margin: 36px 0 12px; }
.bn-legal p, .bn-legal li { font-size: 15px; color: var(--bn-ink-soft); margin: 0 0 14px; }
.bn-legal ul { padding-left: 20px; }
.bn-legal a { text-decoration: underline; }

/* ── Mobile ─────────────────────────────────────────── */
@media (max-width: 860px) {
  .bn-grid, .bn-steps { grid-template-columns: 1fr; }
  .bn-footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .bn-nav-toggle { display: block; }
  .bn-nav-links, .bn-nav-cta .bn-btn-outline { display: none; }
  .bn-nav-links.is-open {
    display: flex; flex-direction: column; align-items: flex-start; gap: 16px;
    position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; padding: 20px 24px; border-bottom: 1px solid var(--bn-border-soft);
    box-shadow: var(--bn-shadow);
  }
  .bn-footer-grid { grid-template-columns: 1fr; }
}