:root {
  --bg: #ffffff;
  --bg-alt: #f7f7f8;
  --text: #16181d;
  --text-muted: #5b606b;
  --border: #e5e7eb;
  --brand: #16181d;
  --brand-contrast: #ffffff;
  --accent: #2563eb;
  --card-bg: #ffffff;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0c0f;
    --bg-alt: #131519;
    --text: #f2f3f5;
    --text-muted: #9aa0ab;
    --border: #23262c;
    --brand: #f2f3f5;
    --brand-contrast: #0b0c0f;
    --accent: #5b8def;
    --card-bg: #16181d;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

img {
  max-width: 100%;
  display: block;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.nav-toggle-checkbox {
  display: none;
}

.nav-toggle-label {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  cursor: pointer;
}

.nav-toggle-label span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

.brand img {
  height: 28px;
  width: auto;
}

@media (prefers-color-scheme: dark) {
  .brand img {
    filter: invert(1) brightness(1.6);
  }
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav a:not(.btn) {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav a:not(.btn):hover {
  color: var(--text);
}

@media (max-width: 720px) {
  .nav-toggle-label {
    display: flex;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px 20px;
  }

  .nav a:not(.btn) {
    padding: 10px 0;
  }

  .nav .btn {
    margin-top: 8px;
    text-align: center;
  }

  .nav-toggle-checkbox:checked ~ .nav {
    display: flex;
  }
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: opacity 0.15s ease, transform 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  opacity: 0.88;
}

.btn-primary {
  background: var(--brand);
  color: var(--brand-contrast);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-lg {
  padding: 14px 26px;
  font-size: 1rem;
}

/* Hero */
.hero {
  padding: 96px 0 72px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  margin: 0 0 20px;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.lede {
  max-width: 640px;
  margin: 0 auto 36px;
  font-size: 1.15rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Sections */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin: 0 0 40px;
  text-align: center;
  letter-spacing: -0.01em;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
}

.card h3 {
  margin-top: 0;
}

.card ol {
  margin: 0;
  padding-left: 1.1em;
  color: var(--text-muted);
}

.card li + li {
  margin-top: 10px;
}

.feature {
  padding: 4px 4px 0;
}

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

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

/* Contact */
.contact-inner {
  text-align: center;
  max-width: 560px;
}

.contact p {
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 28px 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-inner a {
  color: var(--text-muted);
}

.footer-inner a:hover {
  color: var(--text);
}

@media (max-width: 720px) {
  .hero {
    padding: 56px 0 48px;
  }

  .section {
    padding: 48px 0;
  }

  .section h2 {
    margin-bottom: 28px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}