:root {
  --bg: #f3f4f8;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: #ffffff;
  --stroke: rgba(21, 31, 56, 0.08);
  --text: #0f172a;
  --muted: #5b6478;
  --blue: #1f80ff;
  --blue-strong: #0e66e7;
  --chip: #eaf2ff;
  --shadow: 0 22px 48px rgba(26, 40, 73, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070b14;
    --surface: rgba(16, 22, 36, 0.82);
    --surface-strong: #131a2b;
    --stroke: rgba(134, 151, 188, 0.2);
    --text: #edf2ff;
    --muted: #a8b6d6;
    --blue: #4ca2ff;
    --blue-strong: #1f80ff;
    --chip: rgba(60, 122, 216, 0.2);
    --shadow: 0 22px 48px rgba(0, 0, 0, 0.45);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: "SF Pro Text", "SF Pro Display", -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 700px at -10% -15%, rgba(31, 128, 255, 0.26), transparent 55%),
    radial-gradient(900px 600px at 110% -25%, rgba(89, 149, 255, 0.2), transparent 55%),
    var(--bg);
}

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

a:hover {
  text-decoration: underline;
}

.page {
  width: min(1120px, calc(100% - 2.5rem));
  margin: 1.4rem auto 2.5rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.58rem;
  color: var(--text);
  font-weight: 760;
  letter-spacing: -0.02em;
}

.badge {
  width: 2rem;
  height: 2rem;
  border-radius: 0.58rem;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.2rem;
  background: linear-gradient(155deg, #62a8ff 0%, #3f83ea 55%, #2c69cf 100%);
  box-shadow: 0 10px 18px rgba(24, 85, 170, 0.3);
}

.nav {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--muted);
  font-weight: 610;
}

.panel {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.hero {
  padding: clamp(1.4rem, 2.6vw, 2.4rem);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(1rem, 2.8vw, 2.2rem);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5.8vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.subtitle {
  margin: 0.9rem 0 0;
  font-size: clamp(1.02rem, 2.4vw, 1.35rem);
  color: var(--muted);
  max-width: 42ch;
}

.lead {
  margin-top: 1.1rem;
  font-size: clamp(1rem, 2.1vw, 1.23rem);
  line-height: 1.52;
  max-width: 62ch;
}

.chips {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.chip {
  background: var(--chip);
  border: 1px solid color-mix(in oklab, var(--blue) 20%, transparent);
  color: color-mix(in oklab, var(--text) 72%, var(--blue));
  border-radius: 999px;
  padding: 0.4rem 0.78rem;
  font-size: 0.92rem;
  font-weight: 640;
}

.cta-row {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.72rem;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-weight: 700;
  padding: 0.7rem 1.02rem;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(165deg, var(--blue) 0%, var(--blue-strong) 100%);
  box-shadow: 0 12px 28px rgba(31, 128, 255, 0.32);
}

.btn-secondary {
  color: var(--text);
  border: 1px solid var(--stroke);
  background: color-mix(in oklab, var(--surface-strong) 88%, var(--blue) 12%);
}

.btn-primary:hover,
.btn-secondary:hover {
  text-decoration: none;
}

.preview {
  align-self: stretch;
  border: 1px solid var(--stroke);
  border-radius: 18px;
  background: color-mix(in oklab, var(--surface-strong) 88%, var(--blue) 12%);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.preview-title {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.preview-row {
  padding: 0.64rem 0.72rem;
  border-radius: 11px;
  border: 1px solid color-mix(in oklab, var(--stroke) 78%, transparent);
  background: color-mix(in oklab, var(--surface-strong) 92%, var(--blue) 8%);
}

.preview-q {
  color: var(--muted);
  font-size: 0.84rem;
  margin-bottom: 0.25rem;
}

.preview-a {
  font-size: 1.14rem;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.grid {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.82rem;
}

.hero > .grid {
  grid-column: 1 / -1;
}

.tile {
  border: 1px solid var(--stroke);
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--surface-strong) 92%, var(--blue) 8%);
  padding: 1rem;
}

.tile h3 {
  margin: 0;
  font-size: 1.16rem;
  letter-spacing: -0.02em;
}

.tile p {
  margin: 0.52rem 0 0;
  color: var(--muted);
  line-height: 1.44;
}

.content {
  margin-top: 1.2rem;
  padding: clamp(1.2rem, 2.2vw, 2rem);
}

.content h1 {
  margin: 0;
  font-size: clamp(2rem, 4.8vw, 3rem);
  letter-spacing: -0.03em;
}

.content .updated {
  margin-top: 0.4rem;
  color: var(--muted);
}

.content h2 {
  margin: 1.4rem 0 0.54rem;
  font-size: 1.2rem;
}

.content p,
.content li {
  color: var(--text);
  line-height: 1.55;
}

.content ul {
  margin: 0.25rem 0 0.8rem;
}

.footer {
  margin-top: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

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

@media (max-width: 640px) {
  .page {
    width: calc(100% - 1.4rem);
    margin-top: 1rem;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.45rem;
  }

  .nav {
    gap: 0.68rem;
  }

  .hero,
  .content {
    border-radius: 22px;
  }
}