:root {
  color-scheme: light;
  --bg-top: rgba(255, 225, 191, 0.6);
  --bg-left: rgba(170, 219, 255, 0.38);
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: rgba(247, 250, 252, 0.96);
  --surface-code: #13263a;
  --text: #102033;
  --muted: #59708a;
  --border: rgba(191, 206, 223, 0.8);
  --accent: #c15d3f;
  --accent-dark: #9e4a31;
  --shadow: 0 24px 60px rgba(23, 50, 77, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Avenir Next", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at top right, var(--bg-top), transparent 32%),
    radial-gradient(circle at left 18%, var(--bg-left), transparent 28%),
    linear-gradient(180deg, #fff9f0 0%, #f5fbff 55%, #eef4fb 100%);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  letter-spacing: -0.02em;
}

p,
button,
input,
select,
code,
pre,
td,
th,
span,
strong,
label {
  font: inherit;
}

code,
pre {
  font-family: "IBM Plex Mono", "Courier New", monospace;
}

.shell {
  padding: 2rem 1.25rem 3.5rem;
}

.hero,
.layout {
  margin: 0 auto;
  max-width: 1440px;
}

.hero {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: minmax(0, 1.8fr) minmax(320px, 0.95fr);
  margin-bottom: 1.5rem;
}

.hero-card,
.panel {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.badge,
.meta-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge {
  margin-bottom: 1rem;
  background: #102033;
  color: #fff;
  padding: 0.35rem 0.65rem;
}

.meta-pill {
  background: #102033;
  color: #fff;
  padding: 0.3rem 0.65rem;
}

.meta-pill.light {
  background: #edf4fa;
  border: 1px solid rgba(20, 50, 79, 0.08);
  color: #14324f;
}

.hero-main h1 {
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  margin-bottom: 0.85rem;
}

.hero-main p,
.panel-header p,
.log-panel p,
.feature,
.playground-note {
  color: var(--muted);
  line-height: 1.6;
}

.feature-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1.25rem 0;
}

.feature {
  padding: 0.95rem 1rem;
  border: 1px solid #d9e2ec;
  border-radius: 16px;
  background: rgba(245, 247, 251, 0.92);
}

.feature strong {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--text);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  padding: 0.72rem 1.1rem;
  text-decoration: none;
}

.btn.secondary {
  background: transparent;
  border: 1px solid #c7d4e2;
  color: var(--text);
}

.hero-setup {
  display: grid;
  gap: 1rem;
}

.step {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: auto minmax(0, 1fr);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 999px;
  background: #0c73b8;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
}

.hero-setup pre,
.code {
  margin: 0.55rem 0 0;
  padding: 0.95rem 1rem;
  overflow: auto;
  border-radius: 14px;
  background: var(--surface-code);
  color: #edf4fb;
  font-size: 0.83rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.layout {
  display: grid;
  align-items: start;
  gap: 1.25rem;
  grid-template-columns: minmax(0, 1fr) 320px;
}

.panels {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  min-width: 0;
}

.panel-header {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.example-explorer {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(240px, 280px) minmax(0, 1fr);
  min-width: 0;
}

.demo-nav {
  position: sticky;
  top: 1.2rem;
  display: grid;
  gap: 0.9rem;
  align-self: start;
}

.demo-group {
  padding: 1rem;
  border: 1px solid #d9e2ec;
  border-radius: 18px;
  background: linear-gradient(180deg, #fff 0%, #f7fafc 100%);
}

.demo-group h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.demo-list {
  display: grid;
  gap: 0.5rem;
}

.demo-link {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid rgba(16, 32, 51, 0.1);
  border-radius: 12px;
  background: #fff;
  color: #14324f;
  cursor: pointer;
  text-align: left;
  transition: background-color 120ms ease, color 120ms ease, transform 120ms ease;
}

.demo-link:hover,
.demo-link:focus-visible {
  background: #f1f6fb;
  outline: none;
}

.demo-link.active {
  background: #102033;
  border-color: transparent;
  color: #fff;
  transform: translateY(-1px);
}

.demo-stage {
  min-width: 0;
  padding: 1.1rem;
  border: 1px solid #d9e2ec;
  border-radius: 18px;
  background: linear-gradient(180deg, #fff 0%, #f7fafc 100%);
}

.demo-stage-header {
  display: grid;
  gap: 0.5rem;
}

.demo-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.demo-stack {
  display: grid;
  gap: 0.95rem;
}

.controls-card,
.playground-card {
  padding: 1rem;
  border: 1px solid rgba(16, 32, 51, 0.08);
  border-radius: 16px;
  background: #fff;
}

.controls-card h4 {
  margin-bottom: 0.85rem;
}

.control-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 0.35rem;
}

.field label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.field input,
.field select {
  width: 100%;
  min-width: 0;
  min-height: 44px;
  padding: 0.75rem 0.9rem;
  border: 1px solid #c8d5e3;
  border-radius: 12px;
  background: #fff;
  color: var(--text);
}

.playground-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
}

.playground-toolbar button {
  min-height: 40px;
  padding: 0.55rem 0.85rem;
  border: 1px solid rgba(16, 32, 51, 0.14);
  border-radius: 999px;
  background: #fff;
  color: #14324f;
  cursor: pointer;
  font-weight: 600;
}

.playground-toolbar button:hover,
.playground-toolbar button:focus-visible {
  background: #eff6fc;
  outline: none;
}

.playground {
  overflow: hidden;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(241, 246, 251, 0.95), rgba(250, 252, 255, 0.96));
  border: 1px solid rgba(16, 32, 51, 0.08);
  padding: 1rem;
  min-height: 240px;
}

.playground-center {
  display: grid;
  place-items: center;
  min-height: 220px;
}

.observer-target,
.observer-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  user-select: none;
  color: #fff;
  border-radius: 18px;
  border: 0 solid rgba(255, 255, 255, 0.35);
  background: linear-gradient(135deg, #cf5c36, #d99c53);
  box-shadow: 0 20px 35px rgba(143, 45, 22, 0.18);
}

.observer-target {
  min-width: 120px;
  min-height: 120px;
  padding: 1rem;
}

.observer-target::after,
.observer-secondary::after {
  content: attr(data-dimensions);
  display: block;
  padding: 0.35rem;
  font-weight: 700;
}

.observer-target.is-inline {
  display: inline-flex;
  min-height: auto;
  padding: 0.5rem 0.8rem;
}

.observer-target.is-transition {
  transition: border-width 0.8s ease, width 0.8s ease, height 0.8s ease;
  border-width: 0 18%;
}

.observer-target.is-transition[data-filled] {
  border-width: 0;
}

.observer-target.is-animation {
  animation: fill-in-out 1s infinite alternate;
  animation-play-state: paused;
  border-width: 0 14%;
}

.observer-target.is-animation[data-animate] {
  animation-play-state: running;
}

.observer-stack {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.observer-secondary {
  min-height: 100px;
}

.svg-wrap {
  display: grid;
  place-items: center;
  min-height: 220px;
}

.svg-demo {
  overflow: visible;
}

.svg-label {
  fill: #ffffff;
  font-weight: 700;
  font-family: "Avenir Next", "Helvetica Neue", sans-serif;
  text-anchor: middle;
  dominant-baseline: middle;
  font-size: 16px;
}

.observer-note {
  margin-top: 0.85rem;
}

.performance-area {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0.5rem;
  border-radius: 1rem;
  background: rgba(29, 29, 31, 0.05);
  cursor: pointer;
  animation: squeeze-in-out 1s infinite alternate;
  animation-play-state: paused;
}

.performance-area[data-animate] {
  animation-play-state: running;
}

.performance-area div {
  width: calc(5% - 0.25rem);
  min-width: 0;
  min-height: 18px;
  height: auto;
  margin: 0;
  display: block;
  border-radius: 0.45rem;
  background: linear-gradient(135deg, #cf5c36, #d99c53);
}

.results-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.result-card {
  padding: 1rem;
  border: 1px solid rgba(16, 32, 51, 0.08);
  border-radius: 16px;
  background: #fff;
}

.result-card strong {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.result-card span {
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.6;
  word-break: break-word;
}

.result-card.good {
  background: rgba(32, 128, 79, 0.05);
  border-color: rgba(32, 128, 79, 0.18);
}

.result-card.warn {
  background: rgba(180, 35, 24, 0.06);
  border-color: rgba(180, 35, 24, 0.18);
}

.ref-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.ref-card {
  padding: 1rem;
  border: 1px solid #d9e2ec;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
}

.ref-card h4 {
  margin-bottom: 0.75rem;
}

.api-table {
  width: 100%;
  border-collapse: collapse;
}

.api-table th,
.api-table td {
  padding: 0.7rem 0;
  border-bottom: 1px solid #d9e2ec;
  text-align: left;
  vertical-align: top;
}

.api-table th {
  color: var(--muted);
  font-size: 0.82rem;
}

.sidebar {
  min-width: 0;
}

.log-panel {
  position: sticky;
  top: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  max-height: calc(100vh - 2.4rem);
  overflow: hidden;
}

.log-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.8rem;
}

.log-list {
  display: grid;
  gap: 0.55rem;
  max-height: calc(100vh - 18rem);
  overflow-y: auto;
}

.log-entry,
.api-row {
  padding: 0.8rem 0.9rem;
  border: 1px solid #d9e2ec;
  border-radius: 12px;
  background: rgba(245, 247, 251, 0.96);
}

.clear-btn {
  min-height: 40px;
  padding: 0.55rem 0.85rem;
  border: 1px solid rgba(16, 32, 51, 0.14);
  border-radius: 999px;
  background: #fff;
  color: #14324f;
  cursor: pointer;
  font-weight: 600;
}

.clear-btn:hover,
.clear-btn:focus-visible {
  background: #eff6fc;
  outline: none;
}

.release-card {
  display: grid;
  gap: 0.65rem;
}

.api-row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.api-row strong {
  color: var(--muted);
  font-size: 0.78rem;
}

@media (max-width: 1200px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .log-panel,
  .demo-nav {
    position: static;
    max-height: none;
  }

  .log-list {
    max-height: 22rem;
  }
}

@media (max-width: 980px) {
  .hero,
  .example-explorer,
  .ref-grid,
  .results-grid,
  .observer-stack {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .control-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .shell {
    padding: 1rem 0.75rem 2rem;
  }

  .hero-card,
  .panel,
  .demo-stage,
  .demo-group {
    border-radius: 20px;
  }

  .hero-card,
  .panel {
    padding: 1.1rem;
  }

  .hero-main h1 {
    font-size: clamp(2rem, 10vw, 2.9rem);
  }

  .cta-row {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .performance-area div {
    width: calc(10% - 0.25rem);
  }
}

@keyframes fill-in-out {
  to {
    border-width: 0;
  }
}

@keyframes squeeze-in-out {
  to {
    width: 55%;
  }
}