/* Tokens, base typography, links and buttons. Shared by every page (public, staff tools, admin). */
:root {
  --ink: #0b1324;
  --ink-soft: #3a4560;
  --muted: #64708a;
  --line: #e4e8f0;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --brand: #0d7a5f;
  --brand-strong: #0a5f4a;
  --brand-tint: #e7f5f0;
  --brand-2: #14b8a6;
  --accent: #f5b301;
  --accent-strong: #e0a200;
  --accent-ink: #2b1d00;
  --zalo: #0068ff;
  --zalo-strong: #0056d6;
  --warn-bg: #fff6e0;
  --warn-line: #f2c94c;
  --danger: #b42318;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 1px 2px rgba(11, 19, 36, 0.05), 0 12px 32px -10px rgba(11, 19, 36, 0.14);
  --shadow-lg: 0 30px 60px -22px rgba(11, 19, 36, 0.45);
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}
img, iframe { max-width: 100%; }
h1, h2, h3 { margin: 0 0 0.6em; font-family: var(--font-display); line-height: 1.25; font-weight: 700; letter-spacing: -0.02em; }
h1 { font-size: clamp(1.75rem, 1.2rem + 2.4vw, 2.75rem); }
h2 { font-size: clamp(1.35rem, 1.1rem + 1vw, 1.85rem); }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }
/* No underlines: links read as links by colour and weight; inline text links get a soft highlight on hover. */
a { color: var(--brand); text-decoration: none; transition: color 0.15s, background-color 0.15s; }
a:hover { color: var(--brand-strong); }
p a:not(.btn):not(.text-link), li > span a, td a { font-weight: 600; border-radius: 4px; }
p a:not(.btn):not(.text-link):hover, li > span a:hover, td a:hover { background: var(--brand-tint); }
:focus-visible { outline: 3px solid var(--zalo); outline-offset: 2px; border-radius: 4px; }
code { font-size: 0.9em; background: var(--brand-tint); padding: 0.1em 0.35em; border-radius: 6px; }

.container { width: min(1160px, 100% - 32px); margin-inline: auto; }
.narrow { max-width: 780px; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.skip-link {
  position: absolute;
  left: 8px;
  top: -60px;
  z-index: 100;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
}
.skip-link:focus { top: 8px; color: #fff; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-height: 44px;
  padding: 0.6em 1.15em;
  border: 2px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-lg { min-height: 52px; padding: 0.75em 1.5em; font-size: 1.05rem; }
.icon, .icon-phone { flex: none; width: 1.15em; height: 1.15em; }
.btn-accent, .btn-call { background: var(--accent); color: var(--accent-ink); box-shadow: 0 8px 20px -8px rgba(245, 179, 1, 0.7); }
.btn-accent:hover, .btn-call:hover { background: var(--accent-strong); color: var(--accent-ink); }
.btn-zalo { background: var(--zalo); color: #fff; box-shadow: 0 8px 20px -8px rgba(0, 104, 255, 0.7); }
.btn-zalo:hover { background: var(--zalo-strong); color: #fff; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-strong); color: #fff; }
.btn-outline { border-color: var(--brand); color: var(--brand); background: transparent; }
.btn-outline:hover { background: var(--brand-tint); }
.btn-outline-light { border-color: rgba(255, 255, 255, 0.75); color: #fff; }
.btn-outline-light:hover { background: rgba(255, 255, 255, 0.12); color: #fff; }
.btn-ghost { border-color: var(--line); background: transparent; color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink-soft); color: var(--ink); }