:root {
  color-scheme: light dark;
  --page: #f4f6f8;
  --surface: #f8fafc;
  --surface-strong: #ffffff;
  --surface-tint: #eaf1fb;
  --ink: #121820;
  --ink-soft: #4e5968;
  --ink-muted: #6f7a88;
  --line: #d8dee6;
  --line-strong: #bbc5d0;
  --accent: #1d5fd0;
  --accent-hover: #174fae;
  --accent-soft: #e2edfc;
  --accent-ink: #174a9f;
  --danger: #a33232;
  --danger-soft: #f9e6e6;
  --focus: #1d5fd0;
  --shadow-soft: 0 24px 70px rgb(46 63 82 / 12%);
  --shadow-panel: 0 14px 36px rgb(46 63 82 / 8%);
  --radius-panel: 24px;
  --radius-control: 12px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "Noto Sans TC", sans-serif;
  background: var(--page);
  color: var(--ink);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100dvh;
  background:
    radial-gradient(circle at 82% 2%, rgb(208 221 238 / 34%), transparent 28rem),
    var(--page);
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

button,
select {
  font: inherit;
}

button,
.button,
select,
summary,
a {
  -webkit-tap-highlight-color: transparent;
}

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

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 3;
  transform: translateY(-180%);
  border-radius: var(--radius-control);
  background: var(--ink);
  color: var(--surface-strong);
  padding: 10px 14px;
  font-weight: 750;
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(1220px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 72px;
  padding: 0 max(24px, calc((100vw - 1220px) / 2));
  border-bottom: 1px solid rgb(187 197 208 / 62%);
  background: rgb(244 246 248 / 84%);
  backdrop-filter: blur(22px) saturate(150%);
  -webkit-backdrop-filter: blur(22px) saturate(150%);
}

.brand {
  display: block;
  text-decoration: none;
}

.brand-logo {
  display: block;
  width: 160px;
  height: auto;
}

.site-nav {
  grid-column: 2;
  display: flex;
  justify-content: center;
  gap: clamp(20px, 3vw, 38px);
}

.site-nav a,
.source-link,
.footer-links a {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a,
.source-link,
.footer-links a,
.button,
.install-action {
  transition:
    color 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease,
    transform 120ms ease;
}

.site-nav a:hover,
.source-link:hover,
.footer-links a:hover {
  color: var(--accent);
}

.source-link {
  grid-column: 3;
  justify-self: end;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  padding: 8px 13px;
}

.source-link:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(500px, 1.18fr);
  align-items: center;
  gap: clamp(42px, 6vw, 84px);
  min-height: calc(100dvh - 72px);
  padding-block: clamp(48px, 8vh, 82px);
}

.hero-copy {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent-ink);
  font-size: 0.76rem;
  font-weight: 780;
  letter-spacing: 0.13em;
}

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

h1 {
  max-width: 11ch;
  margin-bottom: 24px;
  font-size: clamp(2.9rem, 5vw, 4.7rem);
  line-height: 1.01;
  letter-spacing: -0.058em;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(2.05rem, 3.8vw, 3.2rem);
  line-height: 1.06;
  letter-spacing: -0.045em;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  line-height: 1.35;
}

p {
  color: var(--ink-soft);
  line-height: 1.68;
}

.hero-summary {
  max-width: 29ch;
  margin-bottom: 30px;
  font-size: clamp(1.04rem, 1.7vw, 1.2rem);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  padding: 0 21px;
  font-weight: 740;
  text-decoration: none;
  white-space: nowrap;
}

.button:active,
.install-action:active {
  transform: translateY(1px);
}

.button-primary {
  background: var(--accent);
  color: #f8fbff;
  box-shadow: 0 10px 24px rgb(29 95 208 / 20%);
}

.button-primary:hover {
  background: var(--accent-hover);
}

.button-secondary {
  border-color: var(--line-strong);
  background: rgb(255 255 255 / 58%);
  color: var(--ink);
}

.button-secondary:hover {
  border-color: var(--accent);
  background: var(--surface-strong);
}

.device-demo {
  display: grid;
  gap: 15px;
  margin: 0;
}

.device-demo-stage {
  overflow: hidden;
  border: 1px solid rgb(187 197 208 / 72%);
  border-radius: calc(var(--radius-panel) + 4px);
  background: #efeeec;
  box-shadow: var(--shadow-soft);
}

.device-demo-stage img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.device-demo figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-inline: 6px;
}

.device-demo figcaption > div {
  display: grid;
  gap: 3px;
}

.device-demo figcaption span {
  color: var(--ink-muted);
  font-size: 0.76rem;
}

.device-demo figcaption strong {
  color: var(--ink);
}

.installer-section,
.install-paths,
.operation-section,
.setup-section,
.controls-section,
.widgets-section {
  border-top: 1px solid var(--line);
  padding-block: clamp(78px, 10vw, 126px);
}

.install-paths {
  border-top: 1px solid var(--line);
}

.install-path-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.install-path-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: 1fr auto;
  gap: 22px 24px;
  min-height: 370px;
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface-strong);
  padding: clamp(26px, 4vw, 40px);
  box-shadow: var(--shadow-panel);
}

.install-path-card-update {
  border-color: #b7cae7;
  background: var(--surface-tint);
}

.install-path-index {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 780;
  letter-spacing: 0.1em;
}

.install-path-copy h3 {
  margin-bottom: 14px;
  font-size: clamp(1.55rem, 2.8vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: -0.035em;
}

.install-path-context {
  margin-bottom: 9px;
  color: var(--ink-muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.install-path-description {
  max-width: 42ch;
  margin-bottom: 24px;
}

.install-path-impact {
  display: block;
  color: var(--ink);
  font-size: 0.9rem;
}

.install-path-card-erase .install-path-impact {
  color: var(--danger);
}

.install-path-requirement,
.section-intro .update-requirement {
  max-width: 52ch;
  margin: 16px 0 0;
  color: var(--ink-muted);
  font-size: 0.82rem;
  line-height: 1.55;
}

.install-path-card .button {
  grid-column: 2;
  justify-self: start;
}

.section-intro {
  max-width: 680px;
  margin-bottom: 44px;
}

.section-intro h2 {
  max-width: 13ch;
}

.section-intro p,
.setup-copy > p {
  max-width: 56ch;
  margin-bottom: 0;
  font-size: 1.03rem;
}

.compact-intro {
  margin-bottom: 38px;
}

.installer-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(290px, 0.72fr);
  gap: 26px;
  align-items: stretch;
}

.install-panel,
.preflight,
.configuration-guide {
  border-radius: var(--radius-panel);
}

.install-panel {
  border: 1px solid var(--line);
  background: var(--surface-strong);
  padding: clamp(26px, 4vw, 42px);
  box-shadow: var(--shadow-panel);
}

.preflight {
  border: 1px solid #cbd9ec;
  background: var(--surface-tint);
  padding: clamp(26px, 3vw, 34px);
}

.field-group {
  display: grid;
  gap: 9px;
}

.field-group label {
  color: var(--ink);
  font-weight: 740;
}

select {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-control);
  background: var(--surface-strong);
  color: var(--ink);
  padding: 0 42px 0 15px;
}

select:hover {
  border-color: var(--accent);
}

.field-help {
  margin-bottom: 0;
  color: var(--ink-muted);
  font-size: 0.84rem;
}

.selected-device {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-block: 31px 20px;
  padding-top: 25px;
  border-top: 1px solid var(--line);
}

.selected-device > div {
  display: grid;
  gap: 4px;
}

.selected-label {
  color: var(--ink-muted);
  font-size: 0.76rem;
}

.risk-notice {
  margin-bottom: 22px;
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-control);
  background: var(--surface);
  padding: 18px 20px 17px;
}

.risk-notice-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.risk-notice-heading > span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  border: 1px solid var(--accent);
  border-radius: 50%;
  color: var(--accent-ink);
  font-size: 0.82rem;
  font-weight: 850;
}

.risk-notice h3 {
  margin: 0;
  font-size: 1rem;
}

.risk-notice p {
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 0.88rem;
  line-height: 1.6;
}

.risk-notice .risk-responsibility {
  margin-bottom: 0;
  color: var(--ink);
  font-weight: 650;
}

esp-web-install-button {
  display: block;
  --esp-tools-button-color: var(--accent);
  --esp-tools-button-text-color: #f8fbff;
  --esp-tools-button-border-radius: var(--radius-control);
}

.install-action {
  width: 100%;
  min-height: 54px;
  border: 0;
  border-radius: var(--radius-control);
  background: var(--accent);
  color: #f8fbff;
  padding: 0 20px;
  font-weight: 760;
  cursor: pointer;
  box-shadow: 0 12px 28px rgb(29 95 208 / 18%);
}

.install-action:hover {
  background: var(--accent-hover);
}

.install-action:disabled {
  cursor: not-allowed;
  opacity: 0.56;
  box-shadow: none;
}

.release-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 20px;
  border-radius: var(--radius-control);
  background: var(--surface);
  padding: 13px 15px;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.release-status strong {
  color: var(--ink);
}

.release-status[data-state="error"] {
  background: var(--danger-soft);
}

.release-status[data-state="error"] strong {
  color: var(--danger);
}

.inline-message {
  margin: 12px 0 0;
  border-radius: var(--radius-control);
  padding: 12px 14px;
  font-size: 0.88rem;
}

.error-message {
  background: var(--danger-soft);
  color: var(--danger);
}

.check-list {
  display: grid;
  gap: 18px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  color: var(--ink-soft);
  line-height: 1.58;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-ink);
  font-weight: 850;
}

.procedure {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  list-style: none;
}

.procedure li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 30px 28px 30px 0;
}

.procedure li + li {
  border-left: 1px solid var(--line);
  padding-left: 28px;
}

.procedure-index {
  color: var(--accent);
  font-size: 1.55rem;
  font-weight: 760;
  line-height: 1.1;
}

.procedure p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

.setup-section {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  gap: clamp(46px, 8vw, 108px);
  align-items: start;
}

.setup-addresses {
  display: grid;
  gap: 12px;
  margin-top: 34px;
}

.setup-addresses div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--line);
}

.setup-addresses span {
  color: var(--ink-muted);
  font-size: 0.84rem;
}

code {
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.configuration-guide {
  border: 1px solid var(--line);
  background: var(--surface-strong);
  padding: clamp(28px, 4vw, 42px);
  box-shadow: var(--shadow-panel);
}

.configuration-guide > h3 {
  margin-bottom: 26px;
  font-size: 1.22rem;
}

.configuration-guide ul {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.configuration-guide li {
  display: grid;
  gap: 5px;
  padding-block: 19px;
  border-top: 1px solid var(--line);
}

.configuration-guide strong {
  color: var(--ink);
}

.configuration-guide span {
  color: var(--ink-soft);
  line-height: 1.55;
}

.controls-intro {
  max-width: 720px;
}

.controls-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.42fr) minmax(310px, 0.58fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.controls-visual {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-panel);
  background: #f5f5f4;
  box-shadow: var(--shadow-soft);
}

.controls-visual img {
  display: block;
  width: 100%;
  height: auto;
}

.control-reference {
  position: sticky;
  top: 104px;
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
  background: var(--surface-strong);
  padding: clamp(24px, 3vw, 34px);
  box-shadow: var(--shadow-panel);
}

.control-reference-heading {
  padding-bottom: 22px;
}

.control-reference-heading h3 {
  margin-bottom: 7px;
  font-size: 1.28rem;
}

.control-reference-heading p {
  margin-bottom: 0;
  font-size: 0.9rem;
  line-height: 1.58;
}

.control-reference dl {
  margin: 0;
}

.control-reference dl > div {
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--line);
  padding-block: 18px;
}

.control-reference dl > div:last-child {
  padding-bottom: 0;
}

.control-reference dt {
  color: var(--accent-ink);
  font-size: 0.78rem;
  font-weight: 760;
}

.control-reference dd {
  display: grid;
  gap: 4px;
  margin: 0;
}

.control-reference dd strong {
  color: var(--ink);
  font-size: 0.96rem;
}

.control-reference dd span {
  color: var(--ink-soft);
  font-size: 0.88rem;
  line-height: 1.5;
}

.control-reference .control-reset {
  margin-top: 4px;
  border-top-color: var(--accent);
}

.feature-showcase {
  display: grid;
  grid-template-columns: minmax(300px, 0.76fr) minmax(0, 1.24fr);
  gap: clamp(28px, 5vw, 68px);
  align-items: start;
}

.feature-lead {
  display: grid;
  gap: 34px;
  min-height: 440px;
  border: 1px solid #cbd9ec;
  border-radius: var(--radius-panel);
  background: var(--surface-tint);
  padding: clamp(30px, 5vw, 50px);
}

.feature-metric {
  align-self: start;
  color: var(--accent);
  font-size: clamp(4.4rem, 8vw, 7.4rem);
  font-weight: 760;
  letter-spacing: -0.08em;
  line-height: 0.85;
}

.feature-lead > div {
  align-self: end;
}

.feature-lead h3 {
  margin-bottom: 10px;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  letter-spacing: -0.035em;
}

.feature-lead p {
  max-width: 35ch;
  margin-bottom: 0;
}

.feature-list {
  border-top: 1px solid var(--line-strong);
}

.feature-list article {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  border-bottom: 1px solid var(--line);
  padding-block: 25px;
}

.feature-list article > span {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-control);
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-weight: 780;
}

.feature-list h3 {
  margin-bottom: 5px;
}

.feature-list p {
  max-width: 52ch;
  margin-bottom: 0;
  font-size: 0.92rem;
}

.site-footer {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-top: 34px;
  border-top: 1px solid var(--line-strong);
  padding-block: 34px 46px;
}

.site-footer p {
  margin: 6px 0 0;
  font-size: 0.86rem;
}

.site-footer .trademark-disclaimer {
  max-width: 58ch;
  color: var(--ink-muted);
  font-size: 0.78rem;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 20px;
}

@media (max-width: 980px) {
  .site-nav {
    display: none;
  }

  .hero,
  .install-path-grid,
  .installer-layout,
  .setup-section,
  .controls-layout,
  .feature-showcase {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 46px;
    min-height: auto;
    padding-block: 72px 84px;
  }

  h1 {
    max-width: 12ch;
  }

  .hero-copy,
  .device-demo {
    max-width: 720px;
  }

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

  .procedure li {
    padding: 26px 0;
  }

  .procedure li + li {
    border-top: 1px solid var(--line);
    border-left: 0;
    padding-left: 0;
  }

  .controls-visual {
    max-width: 760px;
  }

  .control-reference {
    position: static;
    max-width: 760px;
  }

  .feature-lead {
    min-height: 360px;
  }
}

@media (max-width: 620px) {
  .shell {
    width: min(100% - 28px, 1220px);
  }

  .site-header {
    min-height: 62px;
    padding-inline: 14px;
  }

  .brand {
    width: 142px;
  }

  .brand-logo {
    width: 100%;
  }

  .source-link {
    padding: 7px 10px;
    font-size: 0.8rem;
  }

  .hero {
    gap: 34px;
    padding-block: 48px 64px;
  }

  h1 {
    font-size: clamp(2.5rem, 12.5vw, 3.45rem);
  }

  h2 {
    font-size: clamp(2rem, 10vw, 2.7rem);
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .device-demo-stage {
    border-radius: var(--radius-panel);
  }

  .installer-section,
  .install-paths,
  .operation-section,
  .setup-section,
  .controls-section,
  .widgets-section {
    padding-block: 70px;
  }

  .install-path-card {
    grid-template-columns: 1fr;
    min-height: auto;
    border-radius: var(--radius-control);
    padding: 26px 22px;
  }

  .install-path-card .button {
    grid-column: 1;
    justify-self: stretch;
  }

  .selected-device {
    align-items: flex-start;
  }

  .setup-addresses div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .controls-layout {
    gap: 24px;
  }

  .controls-visual,
  .control-reference,
  .feature-lead {
    border-radius: var(--radius-control);
  }

  .control-reference {
    padding: 22px 18px;
  }

  .feature-lead {
    min-height: 320px;
    padding: 28px 22px;
  }

  .feature-metric {
    font-size: clamp(4rem, 22vw, 6rem);
  }

  .feature-list article {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 14px;
  }

  .feature-list article > span {
    width: 44px;
    height: 44px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

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

@media (prefers-color-scheme: dark) {
  :root {
    --page: #12171d;
    --surface: #19212a;
    --surface-strong: #1c252f;
    --surface-tint: #1c3049;
    --ink: #eef3f8;
    --ink-soft: #bec8d3;
    --ink-muted: #929fac;
    --line: #34414f;
    --line-strong: #4a5a6b;
    --accent: #79aaf1;
    --accent-hover: #96bdf5;
    --accent-soft: #213d5e;
    --accent-ink: #b4d2fb;
    --danger: #ffb4b4;
    --danger-soft: #4b292d;
    --focus: #9bc4ff;
    --shadow-soft: 0 28px 80px rgb(2 7 12 / 38%);
    --shadow-panel: 0 16px 40px rgb(2 7 12 / 26%);
  }

  body {
    background:
      radial-gradient(circle at 82% 2%, rgb(64 88 116 / 22%), transparent 28rem),
      var(--page);
  }

  .site-header {
    border-bottom-color: rgb(74 90 107 / 70%);
    background: rgb(18 23 29 / 86%);
  }

  .button-primary,
  .install-action {
    color: #101820;
  }

  .button-secondary {
    background: rgb(28 37 47 / 62%);
  }

  .preflight {
    border-color: #38516e;
  }

}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--page);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}