/* ===== Design tokens ===== */
:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1a1d21;
  --text-muted: #5c6470;
  --accent: #3b6ef5;
  --accent-hover: #2f5ad0;
  --border: #e3e6eb;
  --ok: #1d9a5b;
  --err: #d64545;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1e2126;
    --text: #e8eaed;
    --text-muted: #9aa3ae;
    --accent: #5b86f7;
    --accent-hover: #7599f8;
    --border: #2c3038;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

/* ===== Base ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg);
  /* Professional texture: faint grain + soft accent glows */
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncA type='linear' slope='0.035'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E"),
    radial-gradient(1100px 600px at 85% -10%, rgba(59, 110, 245, 0.07), transparent 60%),
    radial-gradient(800px 500px at -10% 110%, rgba(59, 110, 245, 0.05), transparent 55%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3 {
  letter-spacing: -0.015em;
}

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

a:hover {
  text-decoration: underline;
}

/* ===== Header / nav ===== */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}

.site-header .inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}

.brand:hover {
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 1.25rem;
}

.site-nav a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--accent);
  text-decoration: none;
}

/* ===== Layout ===== */
main {
  flex: 1;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
}

.hero {
  text-align: center;
  padding: 3rem 0 2rem;
}

.hero h1 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.card h2 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.4rem;
  font-size: 1rem;
  cursor: pointer;
}

.btn:hover {
  background: var(--accent-hover);
  text-decoration: none;
}

/* ===== Backend status pill ===== */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.8rem;
  background: var(--surface);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.status-pill.ok .status-dot { background: var(--ok); }
.status-pill.err .status-dot { background: var(--err); }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}