:root {
  --kb-bg: #081018;
  --kb-bg-2: #0e1722;
  --kb-surface: rgba(15, 24, 35, 0.88);
  --kb-surface-2: rgba(18, 29, 41, 0.96);
  --kb-line: rgba(255, 255, 255, 0.1);
  --kb-line-strong: rgba(255, 255, 255, 0.16);
  --kb-text: #f4f1ea;
  --kb-muted: rgba(244, 241, 234, 0.7);
  --kb-accent: #4fd1c5;
  --kb-accent-2: #8ab4ff;
  --kb-accent-3: #e4b06c;
  --kb-shadow: 0 26px 70px rgba(0, 0, 0, 0.34);
  --kb-radius-xl: 34px;
  --kb-radius-l: 24px;
  --kb-radius-m: 18px;
  --kb-max: 1440px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--kb-text);
  background:
    radial-gradient(circle at 16% 12%, rgba(79, 209, 197, 0.12), transparent 24%),
    radial-gradient(circle at 84% 8%, rgba(138, 180, 255, 0.1), transparent 22%),
    radial-gradient(circle at 74% 76%, rgba(228, 176, 108, 0.08), transparent 26%),
    linear-gradient(180deg, #071018 0%, #0a1320 55%, #081018 100%);
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

button,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.kb-shell {
  min-height: 100vh;
  width: min(var(--kb-max), calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 40px;
}

.kb-header {
  position: sticky;
  top: 18px;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 20px;
  border: 1px solid var(--kb-line);
  border-radius: 999px;
  background: rgba(7, 14, 21, 0.8);
  backdrop-filter: blur(20px);
  box-shadow: var(--kb-shadow);
}

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

.kb-brand-mark {
  width: 126px;
  height: 44px;
  display: block;
  flex: 0 0 126px;
  padding: 8px 10px;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.04)),
    linear-gradient(135deg, rgba(0, 107, 232, 0.18), rgba(90, 52, 255, 0.28));
  border: 1px solid rgba(255, 255, 255, 0.16);
  overflow: hidden;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.22),
    0 18px 44px rgba(44, 28, 122, 0.28);
}

.kb-brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 0;
}

.kb-brand-copy {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.kb-brand-copy strong {
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.kb-brand-copy span {
  color: var(--kb-muted);
  font-size: 0.88rem;
}

.kb-header-nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.kb-header-nav a,
.kb-button,
.kb-chip,
.kb-tab,
.kb-link-button {
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease, color 0.22s ease;
}

.kb-header-nav a {
  padding: 11px 16px;
  border-radius: 999px;
  color: var(--kb-muted);
  border: 1px solid transparent;
}

.kb-header-nav a:hover {
  color: var(--kb-text);
  border-color: var(--kb-line);
  background: rgba(255, 255, 255, 0.04);
}

.kb-main {
  padding-top: 20px;
}

.kb-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(340px, 0.88fr);
  gap: 22px;
  align-items: stretch;
}

.kb-hero-copy,
.kb-hero-panel,
.kb-panel,
.kb-footer-cta {
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-xl);
  background: linear-gradient(180deg, rgba(17, 26, 39, 0.92), rgba(10, 17, 26, 0.96));
  box-shadow: var(--kb-shadow);
}

.kb-hero-copy {
  position: relative;
  overflow: hidden;
  padding: 42px;
}

.kb-hero-copy::before {
  content: "";
  position: absolute;
  inset: auto -12% -22% auto;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 209, 197, 0.2), transparent 62%);
  pointer-events: none;
}

.kb-eyebrow,
.kb-panel-kicker {
  margin: 0;
  color: rgba(255, 255, 255, 0.54);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
}

.kb-hero-copy h1,
.kb-footer-cta h2 {
  margin: 12px 0 0;
  font-family: "Iowan Old Style", "Songti SC", Georgia, serif;
  letter-spacing: -0.04em;
  line-height: 0.96;
}

.kb-hero-copy h1 {
  font-size: clamp(3rem, 5.2vw, 5.4rem);
  max-width: 9ch;
}

.kb-lead,
.kb-footer-cta p,
.kb-hero-card p,
.kb-doc-summary,
.kb-doc-meta,
.kb-preview-body,
.kb-log,
.kb-result-summary,
.kb-result-source {
  color: var(--kb-muted);
  line-height: 1.72;
}

.kb-lead {
  max-width: 58ch;
  margin: 18px 0 0;
  font-size: 1.03rem;
}

.kb-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.kb-button,
.kb-link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid var(--kb-line);
}

.kb-button-primary,
.kb-link-button {
  color: #0b151f;
  background: linear-gradient(135deg, var(--kb-accent), #b0f5ea);
  border-color: transparent;
  font-weight: 700;
}

.kb-button-secondary {
  color: var(--kb-text);
  background: rgba(255, 255, 255, 0.04);
}

.kb-button:hover,
.kb-link-button:hover,
.kb-tab:hover,
.kb-chip:hover,
.kb-header-nav a:hover {
  transform: translateY(-2px);
}

.kb-hero-panel {
  display: grid;
  gap: 18px;
  padding: 18px;
}

.kb-hero-card,
.kb-result-card,
.kb-doc-card,
.kb-preview,
.kb-console,
.kb-workflow article {
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius-l);
  background: rgba(255, 255, 255, 0.035);
}

.kb-hero-card {
  padding: 22px;
  background:
    radial-gradient(circle at 20% 20%, rgba(79, 209, 197, 0.12), transparent 28%),
    radial-gradient(circle at 82% 12%, rgba(138, 180, 255, 0.14), transparent 24%),
    rgba(255, 255, 255, 0.03);
}

.kb-card-label {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.82rem;
}

.kb-hero-card strong {
  display: block;
  margin-top: 14px;
  font-size: 1.7rem;
}

.kb-hero-card-main p {
  margin: 10px 0 0;
}

.kb-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.kb-hero-stats article {
  padding: 18px;
  border-radius: var(--kb-radius-m);
  border: 1px solid var(--kb-line);
  background: rgba(255, 255, 255, 0.03);
}

.kb-hero-stats strong {
  display: block;
  font-size: 1.8rem;
}

.kb-hero-stats span {
  color: var(--kb-muted);
}

.kb-workbench {
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr) minmax(0, 380px);
  gap: 18px;
  margin-top: 18px;
}

.kb-panel {
  padding: 22px;
}

.kb-panel-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.kb-panel-head h2 {
  margin: 8px 0 0;
  font-family: "Iowan Old Style", "Songti SC", Georgia, serif;
  font-size: clamp(1.6rem, 2.6vw, 2.2rem);
}

.kb-badge {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--kb-line);
  white-space: nowrap;
}

.kb-category-tabs {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.kb-tab {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 16px;
  color: var(--kb-muted);
  border-radius: 18px;
  border: 1px solid var(--kb-line);
  background: rgba(255, 255, 255, 0.03);
}

.kb-tab.is-active {
  color: var(--kb-text);
  border-color: color-mix(in srgb, var(--kb-accent) 62%, white);
  background: color-mix(in srgb, var(--kb-accent) 12%, transparent);
}

.kb-doc-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.kb-doc-card {
  padding: 16px;
  min-height: 124px;
  cursor: pointer;
}

.kb-doc-card.is-active {
  border-color: color-mix(in srgb, var(--kb-accent-2) 58%, white);
  background: color-mix(in srgb, var(--kb-accent-2) 10%, transparent);
}

.kb-doc-card strong,
.kb-result-card strong {
  display: block;
  font-size: 1.02rem;
}

.kb-doc-meta,
.kb-result-source {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  font-size: 0.88rem;
}

.kb-pill,
.kb-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  border: 1px solid var(--kb-line);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(255, 255, 255, 0.8);
}

.kb-chip {
  min-height: 38px;
  padding: 0 14px;
  cursor: pointer;
}

.kb-chip.is-active {
  border-color: rgba(79, 209, 197, 0.44);
  background: rgba(79, 209, 197, 0.08);
}

.kb-input-block {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.kb-input-block span {
  color: rgba(255, 255, 255, 0.74);
}

.kb-input-block textarea {
  width: 100%;
  padding: 16px 18px;
  border-radius: 20px;
  border: 1px solid var(--kb-line);
  color: var(--kb-text);
  background: rgba(255, 255, 255, 0.04);
  resize: vertical;
}

.kb-query-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.kb-workflow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.kb-workflow article {
  min-height: 96px;
  padding: 16px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.kb-workflow strong {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}

.kb-workflow span {
  color: var(--kb-muted);
}

.kb-console {
  margin-top: 18px;
  padding: 18px;
}

.kb-console-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.kb-console-head span {
  color: rgba(255, 255, 255, 0.68);
}

.kb-log {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  min-height: 160px;
  max-height: 340px;
  overflow: auto;
}

.kb-log-line {
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.kb-results {
  display: grid;
  align-content: start;
  gap: 16px;
}

.kb-result-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.kb-result-card {
  padding: 16px;
  cursor: pointer;
}

.kb-result-card.is-active {
  border-color: color-mix(in srgb, var(--kb-accent-3) 58%, white);
  background: color-mix(in srgb, var(--kb-accent-3) 10%, transparent);
}

.kb-result-summary {
  margin-top: 10px;
}

.kb-preview {
  padding: 18px;
  min-height: 260px;
}

.kb-preview-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.kb-preview-body {
  margin-top: 14px;
}

.kb-source-block {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.kb-source-item {
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid var(--kb-line);
  background: rgba(255, 255, 255, 0.03);
  color: rgba(255, 255, 255, 0.84);
}

.kb-footer-cta {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-top: 18px;
  padding: 26px;
}

.kb-footer-cta h2 {
  margin-top: 12px;
  font-size: clamp(2rem, 3vw, 3rem);
}

.kb-footer-cta p {
  max-width: 62ch;
  margin: 12px 0 0;
}

.kb-link-button {
  flex-shrink: 0;
}

.kb-fade-in {
  animation: kb-rise 0.55s ease both;
}

@keyframes kb-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1200px) {
  .kb-hero,
  .kb-workbench,
  .kb-footer-cta {
    grid-template-columns: 1fr;
  }

  .kb-footer-cta {
    display: grid;
  }
}

@media (max-width: 900px) {
  .kb-shell {
    width: min(var(--kb-max), calc(100% - 20px));
    padding-top: 12px;
  }

  .kb-header {
    border-radius: 28px;
    flex-wrap: wrap;
  }

  .kb-header-nav {
    width: 100%;
    justify-content: space-between;
  }

  .kb-hero-copy,
  .kb-panel,
  .kb-hero-panel,
  .kb-footer-cta {
    border-radius: 28px;
  }

  .kb-hero-copy {
    padding: 26px;
  }

  .kb-workflow {
    grid-template-columns: 1fr 1fr;
  }

  .kb-hero-stats {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .kb-header-nav {
    flex-wrap: wrap;
  }

  .kb-actions,
  .kb-query-presets,
  .kb-result-source {
    gap: 8px;
  }

  .kb-hero-copy h1 {
    max-width: none;
  }

  .kb-hero-stats,
  .kb-workflow {
    grid-template-columns: 1fr;
  }

  .kb-footer-cta {
    padding: 22px;
  }
}
.kb-mark {
  padding: 0 2px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--kb-accent) 24%, transparent);
  color: var(--kb-text);
}

.kb-doc-card,
.kb-result-card,
.kb-panel,
.kb-hero-panel,
.kb-hero-copy,
.kb-footer-cta {
  animation: kb-rise 0.55s ease both;
}