:root {
  --bg: #edf3fb;
  --surface: #ffffff;
  --surface-strong: #ffffff;
  --surface-muted: #eef4ff;
  --line: rgba(16, 34, 62, 0.1);
  --text: #162338;
  --muted: #5b6980;
  --heading: #0d1b2f;
  --primary: #1762d2;
  --primary-strong: #0f4ca8;
  --primary-soft: #dde9ff;
  --accent: #2f7df6;
  --accent-soft: #e5f0ff;
  --success: #1f7a63;
  --danger: #b13f3f;
  --shadow: 0 22px 56px rgba(10, 27, 52, 0.14);
  --shadow-soft: 0 12px 28px rgba(10, 27, 52, 0.1);
  --max-width: 1240px;
  --radius-current: 18px;
  --font-body: 'Public Sans', sans-serif;
  --font-heading: 'Space Grotesk', sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(23, 98, 210, 0.14), transparent 26%),
    radial-gradient(circle at top right, rgba(72, 131, 232, 0.12), transparent 24%),
    linear-gradient(180deg, #f4f8fd 0%, #edf3fb 100%),
    var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

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

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

button,
input,
select,
textarea {
  font: inherit;
}

.site-shell {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  padding: 1.25rem 0 4rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.35rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-current);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-soft);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--primary), var(--primary-strong));
  color: #f8fbff;
  font-family: var(--font-heading);
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.brand-copy {
  display: grid;
  gap: 0.2rem;
}

.brand-kicker,
.eyebrow,
.feature-kicker,
.preview-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--muted);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--heading);
}

.site-nav {
  display: inline-flex;
  align-items: center;
  gap: 1.1rem;
  color: var(--muted);
  font-weight: 600;
}

.site-nav a {
  position: relative;
  padding-bottom: 0.2rem;
}

.site-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.1rem;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.toolbar-cluster,
.session-toolbar {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}

.session-chip {
  display: inline-flex;
  align-items: center;
  min-height: 2.4rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-strong);
  color: var(--heading);
  font-size: 0.82rem;
  font-weight: 700;
}

.session-button {
  min-height: 2.4rem;
  padding: 0.55rem 0.9rem;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--primary-strong);
}

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

.theme-select,
.text-field,
.select-field,
.text-area {
  border: 1px solid var(--line);
  border-radius: calc(var(--radius-current) - 4px);
  background: var(--surface-strong);
  color: var(--text);
  padding: 0.85rem 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.8rem 1.2rem;
  border: 1px solid transparent;
  border-radius: calc(var(--radius-current) - 4px);
  font-weight: 700;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(145deg, var(--primary), var(--primary-strong));
  color: #f8fbff;
  box-shadow: var(--shadow-soft);
}

.button-secondary {
  background: var(--surface-strong);
  color: var(--primary-strong);
  border-color: rgba(33, 79, 116, 0.18);
}

.card-surface {
  border: 1px solid var(--line);
  border-radius: var(--radius-current);
  background: rgba(255, 253, 248, 0.94);
  box-shadow: var(--shadow);
}

main h1,
main h2,
main h3 {
  margin: 0;
  font-family: var(--font-heading);
  color: var(--heading);
  line-height: 1.05;
}

main p {
  margin: 0;
  line-height: 1.65;
}

@media (max-width: 960px) {
  .site-header {
    flex-wrap: wrap;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .toolbar-cluster {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
  }
}

@media (max-width: 720px) {
  .site-shell {
    width: min(calc(100% - 1rem), var(--max-width));
    padding-top: 0.6rem;
  }

  .site-header {
    padding: 0.9rem;
  }

  .session-toolbar {
    width: 100%;
    justify-content: space-between;
  }
}