:root {
  /* Brand colors */
  --color-primary: #f725a8;
  --color-secondary: #ff8a2a;
  --color-tertiary: #1f1f24;

  /* Supporting neutrals */
  --color-background: #f7f7fa;
  --color-surface: #ffffff;
  --color-text: #1f1f24;
  --color-text-muted: #6b7280;
  --color-background-dark: #0f1115;
  --color-border: rgba(31, 31, 36, 0.08);

  /* Optional brand gradient */
  --gradient-brand: linear-gradient(135deg, #ff8a2a 0%, #f725a8 100%);

  /* Typography: 4 sizes max */
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: clamp(2.2rem, 5vw, 4rem);

  /* Layout */
  --header-height: 84px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.06);

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0f1115;
    --color-surface: #151922;
    --color-text: #f3f4f6;
    --color-text-muted: #9ca3af;
    --color-border: rgba(255, 255, 255, 0.08);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.24);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: var(--font-size-md);
  line-height: 1.5;
  background: var(--color-background);
  color: var(--color-text);
}

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

a {
  color: inherit;
  text-decoration: none;
}

.site-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  min-height: var(--header-height);
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--color-background) 82%, transparent);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  min-height: var(--header-height);
  width: min(100%, 1400px);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  font-size: var(--font-size-md);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-tagline {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 160ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease;
  background: var(--gradient-brand);
  border-radius: 999px;
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  transform: scaleX(1);
}

.site-main {
  flex: 1;
  display: flex;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
}

.footer-inner {
  width: min(100%, 1400px);
  margin: 0 auto;
  padding: 32px 24px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.footer-title {
  margin: 0 0 8px;
  font-size: var(--font-size-md);
  font-weight: 700;
}

.footer-text,
.footer-note {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.footer-note {
  margin-top: 8px;
}

.footer-links,
.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a,
.footer-meta a,
.footer-meta span {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: color 160ms ease;
}

.footer-links a:hover,
.footer-meta a:hover {
  color: var(--color-text);
}

@media (max-width: 900px) {
  .header-inner {
    padding: 0 18px;
    gap: 16px;
  }

  .brand-tagline {
    display: none;
  }

  .nav-list {
    gap: 16px;
  }

  .hero {
    padding: 40px 18px 56px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    padding: 24px 18px 32px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .site-header {
    position: sticky;
  }

  .nav-list {
    flex-wrap: wrap;
    gap: 10px 16px;
  }

  .hero {
    min-height: auto;
    padding-top: 48px;
  }

  .hero h1 {
    max-width: 100%;
  }

  .hero-text {
    font-size: var(--font-size-md);
  }
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-soft);
}