:root {
  color-scheme: dark;
  --bg: #080a0b;
  --surface: #111417;
  --surface-2: #171b20;
  --surface-3: #20252b;
  --line: rgba(232, 243, 240, 0.14);
  --text: #eef7f5;
  --muted: #aab8b4;
  --quiet: #788781;
  --teal: #45f0c0;
  --coral: #ff7a59;
  --amber: #f2c94c;
  --lime: #b8f36a;
  --shadow: rgba(0, 0, 0, 0.36);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.35;
}

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

button,
textarea {
  font: inherit;
  letter-spacing: 0;
}

button {
  color: inherit;
}

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

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.announcement {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 8px 18px;
  background: #101416;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.announcement__label {
  color: var(--teal);
  font-weight: 800;
}

.announcement__action {
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  padding: 0 10px;
  border: 1px solid rgba(69, 240, 192, 0.42);
  border-radius: 8px;
  color: var(--text);
}

.shell {
  display: grid;
  grid-template-columns: 244px minmax(0, 1fr);
  min-height: calc(100vh - 46px);
}

.sidebar {
  position: sticky;
  top: 46px;
  display: flex;
  height: calc(100vh - 46px);
  flex-direction: column;
  gap: 24px;
  padding: 22px 18px;
  border-right: 1px solid var(--line);
  background: rgba(8, 10, 11, 0.88);
  backdrop-filter: blur(12px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
}

.brand__mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(69, 240, 192, 0.45);
  border-radius: 8px;
  background: #101c1a;
  color: var(--teal);
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 1rem;
}

.brand small {
  margin-top: 2px;
  color: var(--quiet);
  font-size: 0.78rem;
}

.create-button,
.button,
.topbar__primary,
.send-button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 800;
}

.create-button,
.button--primary,
.send-button {
  background: var(--teal);
  color: #07100e;
}

.button--quiet {
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--text);
}

.create-button {
  width: 100%;
}

.nav {
  display: grid;
  gap: 8px;
}

.nav__item,
.help-link {
  min-height: 40px;
  display: flex;
  align-items: center;
  border-radius: 8px;
  padding: 0 12px;
  color: var(--muted);
}

.nav__item:hover,
.help-link:hover,
.nav__item.is-active {
  background: var(--surface-2);
  color: var(--text);
}

.help-link {
  margin-top: auto;
}

.workspace {
  min-width: 0;
  padding: 0 34px 30px;
}

.topbar {
  display: flex;
  min-height: 70px;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.topbar a {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  border-radius: 8px;
  padding: 0 12px;
}

.topbar a:hover {
  background: var(--surface-2);
  color: var(--text);
}

.topbar__primary {
  border: 1px solid var(--line);
  color: var(--text);
}

.hero {
  display: grid;
  grid-template-columns: minmax(330px, 0.82fr) minmax(460px, 1fr);
  gap: 36px;
  align-items: center;
  min-height: 580px;
  padding: 24px 0 56px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: 5.1rem;
  line-height: 0.98;
}

.hero__lead {
  max-width: 620px;
  margin-bottom: 12px;
  color: var(--text);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
}

.hero__body {
  max-width: 610px;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-width: 144px;
  padding: 0 18px;
}

.hero__visual {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 28px 80px var(--shadow);
}

.hero__visual img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.hero__metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.hero__metrics span {
  min-height: 72px;
  display: grid;
  place-items: center;
  padding: 10px;
  background: #0d1012;
  color: var(--muted);
  text-align: center;
  font-size: 0.86rem;
}

.hero__metrics strong {
  display: block;
  color: var(--text);
  font-size: 1.35rem;
}

.quick-start,
.skill-grid,
.showcase-grid {
  display: grid;
  gap: 14px;
}

.quick-start {
  grid-template-columns: repeat(6, minmax(0, 1fr));
  padding: 22px 0 62px;
}

.preset-card,
.skill-card,
.composer,
.signal-list article,
.show-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(17, 20, 23, 0.9);
}

.preset-card {
  min-height: 126px;
  padding: 16px;
  text-align: left;
  cursor: pointer;
}

.preset-card span,
.show-card span {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--coral);
  font-size: 0.76rem;
  font-weight: 900;
  text-transform: uppercase;
}

.preset-card strong {
  display: block;
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.4;
}

.preset-card:hover,
.skill-card:hover,
.show-card:hover {
  border-color: rgba(69, 240, 192, 0.42);
  transform: translateY(-2px);
}

.section-heading {
  max-width: 820px;
  margin: 0 0 22px;
}

.section-heading h2 {
  margin: 0;
  font-size: 2.2rem;
  line-height: 1.22;
}

.agent,
.skills,
.showcase {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}

.agent__layout {
  display: grid;
  grid-template-columns: minmax(360px, 0.9fr) minmax(320px, 1fr);
  gap: 18px;
}

.composer {
  padding: 18px;
}

.composer label {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

textarea {
  width: 100%;
  resize: vertical;
  min-height: 168px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 15px;
  background: #090c0e;
  color: var(--text);
  line-height: 1.65;
}

textarea::placeholder {
  color: var(--quiet);
}

.composer__toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
}

.tool-button,
.filter-chip,
.quick-chip {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--muted);
  cursor: pointer;
  padding: 0 12px;
  font-weight: 800;
}

.send-button {
  min-width: 88px;
  margin-left: auto;
  padding: 0 14px;
}

.send-button:disabled {
  cursor: not-allowed;
  background: var(--surface-3);
  color: var(--quiet);
}

.composer__status {
  min-height: 24px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.signal-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.signal-list article {
  min-height: 220px;
  padding: 18px;
}

.signal-list span {
  color: var(--amber);
  font-size: 0.8rem;
  font-weight: 900;
}

.signal-list strong {
  display: block;
  margin: 16px 0 10px;
  font-size: 1.25rem;
}

.signal-list p,
.skill-card p,
.show-card p {
  color: var(--muted);
  line-height: 1.65;
}

.skill-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.skill-card {
  min-height: 230px;
  padding: 18px;
}

.skill-card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.skill-card h3 {
  margin: 0;
  font-size: 1.2rem;
}

.skill-card__top span {
  color: var(--lime);
  white-space: nowrap;
  font-size: 0.8rem;
  font-weight: 900;
}

.quick-chip {
  margin-top: 8px;
  color: var(--text);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.filter-chip.is-active {
  border-color: rgba(69, 240, 192, 0.55);
  background: #10201d;
  color: var(--teal);
}

.showcase-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.show-card {
  min-height: 196px;
  padding: 18px;
}

.show-card h3 {
  margin-bottom: 10px;
  font-size: 1.16rem;
}

.show-card[hidden] {
  display: none;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border-top: 1px solid var(--line);
  color: var(--quiet);
}

.footer__meta {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 10px 16px;
}

.footer__meta a {
  color: inherit;
}

.footer__meta a:hover {
  color: var(--teal);
}

@media (max-width: 1180px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    padding: 16px 22px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .brand {
    margin-right: auto;
  }

  .create-button {
    width: auto;
    padding: 0 14px;
  }

  .nav {
    display: flex;
    flex-wrap: wrap;
  }

  .help-link {
    margin-top: 0;
  }

  .workspace {
    padding: 0 24px 28px;
  }

  .hero,
  .agent__layout {
    grid-template-columns: 1fr;
  }

  .quick-start {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .skill-grid,
  .showcase-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .announcement {
    position: static;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .topbar {
    justify-content: flex-start;
    flex-wrap: wrap;
    min-height: 64px;
  }

  .hero {
    min-height: 0;
    padding-top: 18px;
  }

  h1 {
    font-size: 3.4rem;
  }

  .hero__lead {
    font-size: 1.45rem;
  }

  .quick-start,
  .skill-grid,
  .showcase-grid,
  .signal-list {
    grid-template-columns: 1fr;
  }

  .hero__metrics {
    grid-template-columns: 1fr;
  }

  .composer__toolbar {
    align-items: stretch;
  }

  .tool-button,
  .send-button {
    flex: 1 1 140px;
  }

  .send-button {
    margin-left: 0;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 0;
  }

  .footer__meta {
    align-items: flex-start;
    flex-direction: column;
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .preset-card,
  .skill-card,
  .show-card,
  .nav__item,
  .button,
  .tool-button,
  .filter-chip,
  .quick-chip {
    transition:
      transform 160ms ease,
      border-color 160ms ease,
      background-color 160ms ease,
      color 160ms ease;
  }
}