/* app.smess.vn — SMEUp support & legal site */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --fg: #14161a;
  --fg-muted: #5b6472;
  --border: #e3e6ea;
  --accent: #1d6fe0;
  --accent-fg: #ffffff;
  --radius: 10px;
  --maxw: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-soft: #171a20;
    --fg: #e8eaed;
    --fg-muted: #9aa3b2;
    --border: #262b33;
    --accent: #4d94ff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

nav a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 14px;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--fg);
}

/* Content */
main {
  padding: 48px 0 64px;
}

h1 {
  font-size: 30px;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

h2 {
  font-size: 20px;
  letter-spacing: -0.01em;
  margin: 36px 0 10px;
}

h3 {
  font-size: 16px;
  margin: 24px 0 8px;
}

p, li { color: var(--fg); }

.lede {
  font-size: 18px;
  color: var(--fg-muted);
  margin: 0 0 28px;
}

.muted { color: var(--fg-muted); }

.small { font-size: 14px; }

a { color: var(--accent); }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

ul { padding-left: 20px; }

li { margin: 6px 0; }

/* Components */
.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 20px 0;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 11px 20px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.btn:hover { opacity: 0.9; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 15px;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th { color: var(--fg-muted); font-weight: 600; }

.table-scroll { overflow-x: auto; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  color: var(--fg-muted);
  font-size: 14px;
}

footer nav { margin-bottom: 10px; }

@media (max-width: 520px) {
  h1 { font-size: 25px; }
  main { padding: 32px 0 48px; }
}