:root {
  --bg: #0A0E14;
  --surface: #131820;
  --surface-strong: #171E28;
  --border: #1E2530;
  --text: #E1F5EE;
  --text-muted: #7A8A9E;
  --accent: #1D9E75;
  --accent-light: #5DCAA5;
  --warn: #F0A24A;
  --danger: #E36D6D;
  --code-bg: #0E141D;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent-light);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  width: 100%;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 14, 20, 0.96);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-weight: 650;
}

.brand-mark {
  width: 34px;
  height: 22px;
}

.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.2rem;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.86rem;
  padding: 0.45rem 0.55rem;
  border-radius: 7px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
  background: var(--surface);
  text-decoration: none;
}

.hero {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3rem 0 2rem;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  gap: 2.5rem;
  align-items: center;
}

.hero-copy h1 {
  max-width: 760px;
  margin-bottom: 1rem;
  font-size: clamp(2.4rem, 6vw, 5.4rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.hero-copy p {
  max-width: 680px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.35rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 0.55rem 1rem;
  color: var(--text);
  background: var(--surface);
  font-size: 0.92rem;
  font-weight: 600;
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.button:hover {
  border-color: var(--accent-light);
  text-decoration: none;
}

.hero-photo {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
  justify-self: center;
  max-width: 420px;
  width: 100%;
}

.hero-photo img {
  display: block;
  width: 100%;
  height: auto;
}

.hero-photo figcaption {
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 0.65rem 0.85rem;
}

.page {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.doc-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 86px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 0.85rem;
}

.sidebar a {
  display: block;
  padding: 0.45rem 0.55rem;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.sidebar a:hover,
.sidebar a[aria-current="page"] {
  color: var(--text);
  background: var(--bg);
  text-decoration: none;
}

.content {
  min-width: 0;
}

.content h1 {
  margin-bottom: 0.75rem;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1;
  letter-spacing: 0;
}

.content h2 {
  margin-top: 2rem;
  margin-bottom: 0.7rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 1.45rem;
  letter-spacing: 0;
}

.content h3 {
  margin-top: 1.35rem;
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.content p,
.content li {
  color: var(--text-muted);
}

.content p + p {
  margin-top: 0.75rem;
}

.content ul,
.content ol {
  padding-left: 1.35rem;
  margin: 0.5rem 0 1rem;
}

.content li + li {
  margin-top: 0.35rem;
}

.content strong {
  color: var(--text);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.5rem;
}

.card,
.board-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
}

.card h2,
.card h3,
.board-card h2 {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.card p,
.board-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.photo-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.5rem;
  align-items: start;
}

.photo-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
}

.photo-card img {
  display: block;
  width: 100%;
  height: auto;
}

.photo-card figcaption {
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 0.7rem 0.85rem;
}

.system-flow {
  display: grid;
  grid-template-columns: minmax(220px, 1.35fr) 84px minmax(160px, 0.85fr) 104px minmax(180px, 1fr) 84px minmax(150px, 0.75fr);
  gap: 0.55rem;
  align-items: center;
  margin: 1.35rem 0 1.8rem;
}

.flow-boundary,
.flow-card {
  min-height: 178px;
  border-radius: 8px;
  padding: 1rem;
}

.flow-boundary {
  border: 1px dashed var(--accent-light);
  background: rgba(29, 158, 117, 0.06);
}

.linux-host {
  border-style: solid;
  border-color: var(--border);
  background: var(--surface);
}

.endpoint {
  border-style: solid;
  border-color: var(--border);
  background: var(--surface);
}

.flow-card {
  border: 1px solid var(--border);
  background: var(--surface);
}

.flow-card h3 {
  margin: 0.4rem 0 0.35rem;
  font-size: 1rem;
}

.flow-card p {
  color: var(--text-muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.flow-label {
  color: var(--accent-light);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.docker-box {
  margin-top: 0.8rem;
  border: 1px dashed rgba(93, 202, 165, 0.7);
  border-radius: 8px;
  background: var(--bg);
  padding: 0.85rem;
  box-shadow: inset 0 0 0 1px rgba(29, 158, 117, 0.08);
}

.docker-box > .flow-label {
  display: inline-flex;
  border: 1px solid rgba(93, 202, 165, 0.28);
  border-radius: 999px;
  background: rgba(29, 158, 117, 0.09);
  padding: 0.18rem 0.45rem;
}

.service-stack,
.endpoint-stack {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.75rem;
}

.service-pill,
.endpoint-module {
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface-strong);
  color: var(--text);
  padding: 0.55rem 0.65rem;
  font-size: 0.88rem;
  font-weight: 650;
  text-align: center;
}

.service-pill {
  display: grid;
  gap: 0.1rem;
}

.service-pill strong {
  color: var(--text);
  font-size: 0.92rem;
}

.service-pill span {
  color: var(--text-muted);
  font-size: 0.74rem;
  font-weight: 500;
}

.primary-service {
  border-color: rgba(93, 202, 165, 0.45);
  background: rgba(29, 158, 117, 0.12);
}

.service-link {
  position: relative;
  color: var(--text-muted);
  font-size: 0.78rem;
  text-align: center;
  padding: 0.15rem 0;
}

.service-link::before,
.service-link::after {
  content: "";
  position: absolute;
  left: 50%;
  height: 0.45rem;
  border-left: 1px solid rgba(93, 202, 165, 0.45);
}

.service-link::before {
  top: -0.45rem;
}

.service-link::after {
  bottom: -0.45rem;
}

.endpoint-module {
  background: var(--bg);
}

.endpoint-module + .endpoint-module {
  position: relative;
}

.endpoint-module + .endpoint-module::before {
  content: "";
  position: absolute;
  top: -0.55rem;
  left: 50%;
  height: 0.55rem;
  border-left: 1px solid var(--border);
}

.flow-connector {
  position: relative;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.flow-connector::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  border-top: 1px solid var(--border);
}

.flow-connector.wireless::before {
  border-top-style: dashed;
  border-top-color: var(--accent-light);
}

.flow-connector span {
  position: relative;
  z-index: 1;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--text-muted);
  padding: 0.25rem 0.45rem;
  font-size: 0.72rem;
  line-height: 1.2;
}

.flow-connector.wireless span {
  color: var(--accent-light);
  border-color: rgba(93, 202, 165, 0.35);
}

.notice {
  margin: 1rem 0;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  padding: 0.85rem 1rem;
  color: var(--text-muted);
}

.notice.warn {
  border-left-color: var(--warn);
}

.notice.danger {
  border-left-color: var(--danger);
}

.flasher {
  padding: 2rem 0 0;
}

.flasher h2 {
  margin-bottom: 0.65rem;
}

.board-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
  margin-bottom: 1rem;
}

.board-card esp-web-install-button {
  --esp-tools-button-color: var(--accent);
  --esp-tools-button-text-color: var(--bg);
}

.board-card esp-web-install-button:not(:defined) {
  display: inline-flex;
  width: 155px;
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-strong);
}

.board-card esp-web-install-button:not(:defined) > * {
  display: none;
}

.board-card esp-web-install-button button {
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 8px;
  padding: 0.62rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}

.board-card esp-web-install-button button:hover {
  background: var(--accent-light);
}

.region-select {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1rem 0;
}

.region-select label {
  color: var(--text-muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

.region-select select {
  min-width: 190px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.45rem 0.6rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.region-select select:focus {
  outline: 1px solid var(--accent);
}

.browser-note {
  color: var(--text-muted);
  font-size: 0.86rem;
  text-align: center;
  margin-top: 1.25rem;
}

.steps-panel {
  margin-top: 1.25rem;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

.steps-panel h2 {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.steps-panel ol {
  columns: 2;
  column-gap: 2.25rem;
}

.steps-panel li {
  break-inside: avoid;
}

code {
  background: var(--border);
  color: var(--text);
  padding: 0.12rem 0.35rem;
  border-radius: 4px;
  font-size: 0.88em;
}

pre {
  margin: 0.8rem 0 1rem;
  overflow-x: auto;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}

pre code {
  display: block;
  padding: 0;
  background: transparent;
  color: var(--text);
  font-size: 0.85rem;
  line-height: 1.55;
}

.table-wrap {
  overflow-x: auto;
  margin: 0.8rem 0 1.2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 0.7rem 0.8rem;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--text);
  background: var(--surface-strong);
  font-size: 0.84rem;
}

td {
  color: var(--text-muted);
  font-size: 0.9rem;
}

tr:last-child td {
  border-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.page-banner {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 1.5rem;
  background: var(--surface);
}

@media (max-width: 1040px) {
  .system-flow {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .flow-boundary,
  .flow-card {
    min-height: auto;
  }

  .flow-connector {
    min-height: 42px;
  }

  .flow-connector::before {
    top: 0;
    bottom: 0;
    left: 50%;
    right: auto;
    border-top: 0;
    border-left: 1px solid var(--border);
  }

  .flow-connector.wireless::before {
    border-left-style: dashed;
    border-left-color: var(--accent-light);
  }
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 0.8rem 0;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-top: 2rem;
  }

  .doc-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .photo-gallery {
    grid-template-columns: 1fr;
  }

  .steps-panel ol {
    columns: 1;
  }
}