/* chotao.vn — one brand hue (#1F6FEB) and cool neutrals, as in the app. */
:root {
  --brand: #1f6feb;
  --brand-text: #1a5fd0;
  --brand-soft: #eaf1fe;
  --text: #0f172a;
  --text-secondary: #475569;
  --background: #ffffff;
  --surface: #f5f7fa;
  --border: #e2e8f0;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand-text: #7fb0ff;
    --brand-soft: #14233d;
    --text: #e6eaf2;
    --text-secondary: #a3adbd;
    --background: #0b0f17;
    --surface: #121826;
    --border: #232c3d;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--brand-text);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-header,
.site-footer,
main {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 20px;
  padding-bottom: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-family: 'Be Vietnam Pro', sans-serif;
  font-weight: 700;
  font-size: 19px;
}

.brand img {
  border-radius: 9px;
}

.site-header nav {
  display: flex;
  gap: 20px;
  font-size: 15px;
}

.site-header nav a {
  color: var(--text-secondary);
}

.brand span,
.site-header nav a {
  white-space: nowrap;
}

@media (max-width: 480px) {
  .site-header nav {
    gap: 14px;
    font-size: 14px;
  }
}

h1,
h2,
h3 {
  font-family: 'Be Vietnam Pro', sans-serif;
  line-height: 1.25;
}

/* Home */
.hero {
  padding: 64px 0 48px;
  max-width: 720px;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(40px, 7vw, 64px);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0 0 28px;
  font-size: 19px;
  color: var(--text-secondary);
}

.soon {
  display: inline-block;
  margin: 0;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-text);
  font-weight: 600;
  font-size: 15px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding: 16px 0 40px;
}

.features article {
  padding: 22px;
  border-radius: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.features h2 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
}

.features p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 16px;
}

.promise {
  padding: 8px 0 64px;
}

.promise p {
  margin: 0;
  max-width: 640px;
  font-weight: 600;
}

/* Legal pages */
.legal article {
  max-width: 720px;
  padding: 32px 0 64px;
}

.legal h1 {
  margin: 0 0 8px;
  font-size: clamp(30px, 5vw, 40px);
  font-weight: 800;
}

.legal h2 {
  margin: 36px 0 10px;
  font-size: 22px;
  font-weight: 700;
}

.legal h3 {
  margin: 22px 0 6px;
  font-size: 18px;
  font-weight: 600;
}

.legal p,
.legal li {
  color: var(--text);
}

.legal ul {
  padding-left: 22px;
}

.legal li + li {
  margin-top: 6px;
}

.updated {
  color: var(--text-secondary);
  font-size: 15px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 24px;
  padding-bottom: 40px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 15px;
}

.site-footer p {
  margin: 0;
}

.site-footer span {
  margin: 0 8px;
}