:root {
  --accent: #0f766e;
  --accent-soft: #dff3f0;
  --background: #f7f7f4;
  --border: #d8d8d2;
  --hero-shadow: rgb(23 24 21 / 14%);
  --muted: #65675f;
  --panel: #ffffff;
  --preview-line: #d8d8d2;
  --primary-text: #ffffff;
  --text: #171815;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --accent: #5eead4;
  --accent-soft: #123f3b;
  --background: #111313;
  --border: #303436;
  --hero-shadow: rgb(0 0 0 / 36%);
  --muted: #a0a5a1;
  --panel: #181b1b;
  --preview-line: #303436;
  --primary-text: #06201d;
  --text: #f0f3ef;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent: #5eead4;
    --accent-soft: #123f3b;
    --background: #111313;
    --border: #303436;
    --hero-shadow: rgb(0 0 0 / 36%);
    --muted: #a0a5a1;
    --panel: #181b1b;
    --preview-line: #303436;
    --primary-text: #06201d;
    --text: #f0f3ef;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  background: var(--background);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  margin: 0;
}

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

.landing-header {
  align-items: center;
  display: flex;
  height: 4rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 72rem;
  padding: 0 1.5rem;
  position: relative;
  z-index: 2;
}

.brand {
  align-items: center;
  display: inline-flex;
  font-size: 1.15rem;
  font-weight: 800;
  gap: 0.5rem;
}

.brand-logo {
  background: var(--accent);
  display: block;
  flex: 0 0 auto;
  height: 1.42rem;
  mask: url("/nully_mark.svg") center / contain no-repeat;
  -webkit-mask: url("/nully_mark.svg") center / contain no-repeat;
  width: 1.06rem;
}

.landing-header nav {
  align-items: center;
  display: flex;
  gap: 0.35rem;
}

.landing-header nav a,
.hero-actions a {
  border: 1px solid var(--border);
  border-radius: 6px;
  min-height: 2.35rem;
  padding: 0.45rem 0.75rem;
}

.landing-header nav a:hover,
.secondary-link:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.landing-header nav .auth-link {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--primary-text);
  font-weight: 700;
}

.landing-header nav .auth-link:hover {
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.landing-hero {
  align-items: center;
  display: grid;
  min-height: calc(100svh - 7rem);
  overflow: hidden;
  padding: 3rem 1.5rem;
  position: relative;
}

.hero-preview {
  inset: 0;
  overflow: hidden;
  position: absolute;
  z-index: 0;
}

.preview-shell {
  background: color-mix(in srgb, var(--panel) 92%, var(--accent));
  border: 1px solid var(--border);
  box-shadow: 0 2rem 5rem var(--hero-shadow);
  display: grid;
  grid-template-columns: 12rem minmax(0, 1fr);
  height: min(34rem, 68vh);
  opacity: 0.78;
  position: absolute;
  right: max(1.5rem, calc((100vw - 72rem) / 2));
  top: 2rem;
  transform: rotate(-2deg);
  width: min(52rem, 72vw);
}

.preview-sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: grid;
  gap: 0.7rem;
  align-content: start;
  padding: 1.2rem;
}

.preview-sidebar span,
.preview-message.assistant span,
.preview-composer span {
  background: var(--preview-line);
  border-radius: 999px;
  display: block;
  height: 0.75rem;
}

.preview-sidebar span:nth-child(1) {
  width: 65%;
}

.preview-sidebar span:nth-child(2) {
  width: 92%;
}

.preview-sidebar span:nth-child(3) {
  width: 78%;
}

.preview-chat {
  display: grid;
  gap: 1rem;
  grid-template-rows: 1fr auto auto;
  padding: 5rem 2rem 2rem;
}

.preview-message {
  border-radius: 8px;
  max-width: 28rem;
}

.preview-message.user {
  align-self: end;
  background: var(--accent);
  color: var(--primary-text);
  justify-self: end;
  padding: 0.7rem 0.85rem;
}

.preview-message.assistant {
  display: grid;
  gap: 0.6rem;
}

.preview-message.assistant span:nth-child(1) {
  width: 88%;
}

.preview-message.assistant span:nth-child(2) {
  width: 72%;
}

.preview-message.assistant span:nth-child(3) {
  width: 56%;
}

.preview-composer {
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr 2.35rem;
  min-height: 3.35rem;
  padding: 0.45rem 0.5rem 0.45rem 0.8rem;
}

.preview-composer strong {
  background: var(--accent);
  border-radius: 6px;
  display: block;
  height: 2.35rem;
}

.hero-copy {
  max-width: 38rem;
  position: relative;
  width: 100%;
  z-index: 1;
}

.hero-logo {
  background: var(--accent);
  display: block;
  height: 3.45rem;
  mask: url("/nully_mark.svg") center / contain no-repeat;
  margin-bottom: 1.1rem;
  -webkit-mask: url("/nully_mark.svg") center / contain no-repeat;
  width: 2.58rem;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin: 0 0 0.8rem;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(3.5rem, 12vw, 7rem);
  letter-spacing: 0;
  line-height: 0.9;
  margin: 0;
}

.hero-copy p:not(.eyebrow) {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 1.25rem 0 0;
  max-width: 34rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.primary-link {
  background: var(--accent);
  border-color: var(--accent) !important;
  color: var(--primary-text);
  font-weight: 700;
}

.secondary-link {
  background: var(--panel);
}

.landing-strip {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0 auto;
  max-width: 72rem;
  padding: 1.5rem 1.5rem 4rem;
}

.landing-strip div {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}

.landing-strip h2 {
  font-size: 1rem;
  margin: 0 0 0.35rem;
}

.landing-strip p {
  color: var(--muted);
  margin: 0;
}

@media (max-width: 760px) {
  .landing-header {
    padding: 0 1rem;
  }

  .landing-header nav a {
    padding-left: 0.55rem;
    padding-right: 0.55rem;
  }

  .landing-hero {
    min-height: calc(100svh - 8rem);
    padding: 2rem 1rem;
  }

  .preview-shell {
    grid-template-columns: 1fr;
    opacity: 0.32;
    right: -7rem;
    top: 7rem;
    width: 36rem;
  }

  .preview-sidebar {
    display: none;
  }

  .hero-copy p:not(.eyebrow) {
    font-size: 1rem;
  }

  .landing-strip {
    grid-template-columns: 1fr;
    padding: 1rem 1rem 3rem;
  }
}