*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #f4f6fb;
  --paper: #ffffff;
  --ink: #1a2233;
  --muted: #5c677d;
  --line: #dde3ef;
  --brand: #3b5bdb;
  --brand-dark: #2f4ac0;
  --accent: #12b886;
  --warn-bg: #fff4e6;
  --warn-border: #ffd8a8;
  --warn-ink: #8f4b00;
  --err-bg: #fff5f5;
  --err-border: #ffc9c9;
  --err-ink: #c92a2a;
  --shadow: 0 18px 50px rgba(26, 34, 51, 0.08);
  --radius: 18px;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

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

.wrap {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.site-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
}

.logo {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span { color: var(--brand); }

.hdr-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  font: inherit;
}

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

.btn.primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.btn.primary:hover { background: var(--brand-dark); }

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  padding: 36px 0 56px;
  align-items: center;
}

.hero-card,
.panel,
.feature,
.example {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card { padding: 34px; }

.kicker {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #edf2ff;
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.hero-side {
  padding: 28px;
}

.hero-side h2 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.sub-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.sub-list li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 0.95rem;
}

.sub-list li:first-child { border-top: 0; padding-top: 0; }

.sub-list code {
  display: block;
  margin-top: 4px;
  color: var(--brand);
  font-size: 0.92rem;
}

.section { padding: 10px 0 48px; }

.section h2 {
  margin: 0 0 18px;
  font-size: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature { padding: 22px; }

.feature h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.examples {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.example {
  padding: 18px;
}

.example strong {
  display: block;
  margin-bottom: 6px;
}

.example span {
  color: var(--muted);
  font-size: 0.9rem;
}

.auth-page {
  min-height: calc(100vh - 90px);
  display: grid;
  place-items: center;
  padding: 28px 0 48px;
}

.panel {
  width: min(440px, 100%);
  padding: 30px;
}

.panel h1 {
  font-size: 1.7rem;
  margin-bottom: 8px;
}

.panel .sub {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 0.95rem;
}

.field { margin-bottom: 14px; }

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.88rem;
  font-weight: 600;
}

.field input {
  width: 100%;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font: inherit;
  background: #fbfcfe;
}

.field input:focus {
  outline: 2px solid rgba(59, 91, 219, 0.25);
  border-color: var(--brand);
}

.alert {
  margin: 0 0 16px;
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 0.92rem;
}

.alert.error {
  background: var(--err-bg);
  border: 1px solid var(--err-border);
  color: var(--err-ink);
}

.alert.warn {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-ink);
}

.alert[hidden] { display: none; }

.panel .foot {
  margin-top: 18px;
  font-size: 0.9rem;
  color: var(--muted);
  text-align: center;
}

.site-footer {
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

@media (max-width: 900px) {
  .hero,
  .grid-3,
  .examples {
    grid-template-columns: 1fr;
  }
}