:root {
  color-scheme: dark;
  --bg: #080b0f;
  --surface: #0d1218;
  --surface-raised: #111820;
  --line: #26313b;
  --line-soft: #182129;
  --text: #f3f1ea;
  --muted: #a3adb8;
  --quiet: #6f7b87;
  --accent: #58d6e8;
  --accent-ink: #041013;
  --max: 1180px;
  --radius: 14px;
  --font-sans: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

button,
a {
  color: inherit;
}

button,
summary {
  font: inherit;
}

a {
  text-decoration: none;
}

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

p {
  color: var(--muted);
}

h1,
h2,
h3,
strong {
  color: var(--text);
}

h1,
h2 {
  letter-spacing: -0.055em;
  line-height: 1.08;
}

h1 {
  max-width: 820px;
  margin-bottom: 28px;
  font-size: clamp(2.65rem, 6vw, 5.5rem);
  font-weight: 760;
}

h1 > span {
  display: block;
}

.hero-context {
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 0.48em;
  font-weight: 580;
  letter-spacing: -0.03em;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 3.8rem);
  font-weight: 700;
}

h3 {
  font-size: 1.2rem;
  line-height: 1.35;
}

::selection {
  color: var(--accent-ink);
  background: var(--accent);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 16px;
  color: var(--accent-ink);
  background: var(--accent);
  transform: translateY(-160%);
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.section-shell,
.site-header {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.site-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 84px;
  border-bottom: 1px solid var(--line-soft);
}

.brand {
  display: inline-flex;
  justify-self: start;
  align-items: center;
  gap: 12px;
  width: max-content;
  line-height: 1;
}

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

.brand strong {
  font-size: 0.9rem;
  letter-spacing: 0.24em;
}

.brand small {
  margin-top: 5px;
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.13em;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--accent);
  border-radius: 50%;
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
  background: var(--accent);
}

.brand-mark::before {
  width: 1px;
  height: 42px;
}

.brand-mark::after {
  width: 42px;
  height: 1px;
}

.brand-mark span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 9px -7px 0 -1px var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav a,
.site-footer > a:last-child {
  color: var(--muted);
  font-size: 0.84rem;
}

.site-nav a:hover,
.site-footer > a:last-child:hover {
  color: var(--text);
}

.site-header > .button {
  justify-self: end;
}

.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 52px;
  padding: 0 24px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent-ink);
  background: var(--accent);
  font-weight: 700;
  cursor: pointer;
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-small {
  min-height: 40px;
  padding-inline: 18px;
  font-size: 0.82rem;
}

.button-quiet {
  color: var(--text);
  background: transparent;
  border-color: var(--line);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  color: var(--text);
  border-bottom: 1px solid var(--line);
}

.text-link span {
  color: var(--accent);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(340px, 0.82fr);
  gap: clamp(48px, 7vw, 104px);
  align-items: center;
  min-height: calc(100vh - 84px);
  padding-block: 100px 112px;
}

.kicker,
.section-number,
.console-label,
.instrument-head,
.axis-code,
.report-head > div > span,
.report-stamp,
.report-next span {
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  color: var(--accent);
}

.kicker > span {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.hero-lede {
  max-width: 660px;
  margin-bottom: 36px;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 28px;
}

.trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  padding: 0;
  margin: 42px 0 0;
  list-style: none;
  color: var(--quiet);
  font-size: 0.8rem;
}

.trust-list li::before {
  margin-right: 9px;
  color: var(--accent);
  content: "✓";
}

.hero-instrument {
  position: relative;
  min-height: 580px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface);
}

.instrument-head {
  display: flex;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}

.status-dot {
  color: var(--accent);
}

.status-dot::before {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.signal-field {
  position: relative;
  min-height: 390px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.orbit,
.axis,
.signal-point,
.scanner {
  position: absolute;
  display: block;
}

.orbit {
  top: 50%;
  left: 50%;
  border: 1px solid var(--line);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.orbit-one {
  width: 264px;
  height: 264px;
}

.orbit-two {
  width: 142px;
  height: 142px;
}

.axis {
  top: 50%;
  left: 50%;
  background: var(--line);
  transform: translate(-50%, -50%);
}

.axis-x {
  width: 100%;
  height: 1px;
}

.axis-y {
  width: 1px;
  height: 100%;
}

.signal-point {
  width: 10px;
  height: 10px;
  border: 2px solid var(--bg);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.point-one { top: 28%; left: 62%; }
.point-two { top: 62%; left: 28%; }
.point-three { top: 69%; left: 70%; }

.scanner {
  top: 0;
  bottom: 0;
  left: 36%;
  width: 1px;
  background: var(--accent);
  opacity: 0.42;
  animation: scan 5.5s ease-in-out infinite alternate;
}

.instrument-readout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
}

.instrument-readout div {
  padding: 20px;
  border-right: 1px solid var(--line);
}

.instrument-readout div:last-child {
  border-right: 0;
}

.instrument-readout dt {
  margin-bottom: 4px;
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
}

.instrument-readout dd {
  margin: 0;
  font-size: 0.86rem;
}

.diagnostic,
.axes,
.report,
.process,
.faq {
  padding-block: 132px;
  border-top: 1px solid var(--line-soft);
}

.section-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 80px;
  align-items: end;
  margin-bottom: 70px;
}

.section-intro > p {
  max-width: 460px;
  margin: 0 0 4px;
}

.section-number {
  margin-bottom: 20px;
}

.diagnostic-console {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  min-height: 550px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.console-rail {
  display: flex;
  flex-direction: column;
  padding: 30px;
  border-right: 1px solid var(--line);
}

.console-rail strong {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.step-dots {
  display: grid;
  grid-template-columns: repeat(3, 34px);
  gap: 10px;
  padding: 0;
  margin: 44px 0;
  list-style: none;
}

.step-dots li {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.step-dots li.is-current {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
}

.step-dots li.is-complete {
  color: var(--accent);
  border-color: var(--accent);
}

.console-note {
  display: flex;
  gap: 12px;
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.console-note > span {
  color: var(--accent);
}

.console-note p {
  margin: 0;
  font-size: 0.78rem;
}

.console-stage {
  display: grid;
  align-items: center;
  padding: clamp(34px, 6vw, 76px);
}

.question-code {
  margin-bottom: 16px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
}

.question-title {
  max-width: 650px;
  margin-bottom: 34px;
  font-size: clamp(1.55rem, 3vw, 2.5rem);
  line-height: 1.3;
  letter-spacing: -0.035em;
}

.answer-list {
  display: grid;
  gap: 12px;
}

.answer-button {
  display: grid;
  grid-template-columns: 38px 1fr auto;
  gap: 14px;
  align-items: center;
  width: 100%;
  min-height: 66px;
  padding: 12px 18px;
  border: 1px solid var(--line);
  color: var(--text);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: border-color 160ms ease, background-color 160ms ease;
}

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

.answer-index,
.answer-key {
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.answer-key {
  opacity: 0;
}

.answer-button:hover .answer-key,
.answer-button:focus-visible .answer-key {
  opacity: 1;
}

.result-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
}

.result-kicker::before {
  width: 28px;
  height: 1px;
  background: var(--accent);
  content: "";
}

.result-title {
  margin: 18px 0 24px;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.05em;
}

.result-summary {
  max-width: 680px;
  font-size: 1.06rem;
}

.result-action {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  padding: 24px 0;
  margin: 32px 0;
  border-block: 1px solid var(--line);
}

.result-action span {
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.result-action strong {
  font-size: 1.04rem;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.result-privacy {
  max-width: 620px;
  margin: 18px 0 0;
  color: var(--quiet);
  font-size: 0.76rem;
}

.axis-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.axis-card {
  min-height: 320px;
  padding: 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.axis-card h3 {
  margin: 72px 0 18px;
}

.axis-card p {
  font-size: 0.9rem;
}

.axis-card small {
  display: block;
  padding-top: 20px;
  margin-top: 28px;
  border-top: 1px solid var(--line-soft);
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.65rem;
}

.report-sheet {
  border: 1px solid var(--line);
  background: var(--surface);
}

.report-head {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: center;
  padding: 28px 34px;
  border-bottom: 1px solid var(--line);
}

.report-head h3 {
  margin: 8px 0 0;
  font-size: clamp(1.35rem, 3vw, 2.1rem);
}

.report-stamp {
  padding: 7px 11px;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.report-body {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
}

.report-finding {
  padding: 42px 34px;
  border-right: 1px solid var(--line);
}

.report-finding p {
  margin: 20px 0 0;
  color: var(--text);
  font-size: 1.04rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

th,
td {
  padding: 17px 22px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

th {
  color: var(--quiet);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.1em;
}

.active-row td {
  color: var(--accent);
  background: rgba(88, 214, 232, 0.05);
}

.report-next {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 28px 34px;
  border-top: 1px solid var(--line);
}

.process-list {
  padding: 0;
  margin: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.process-list li {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 30px;
  padding: 38px 0;
  border-bottom: 1px solid var(--line);
}

.process-list li > span {
  color: var(--accent);
  font-family: var(--font-mono);
}

.process-list h3 {
  margin-bottom: 8px;
  font-size: 1.35rem;
}

.process-list p {
  margin: 0;
}

.faq {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 90px;
}

.faq-heading h2 {
  position: sticky;
  top: 40px;
}

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

details {
  border-bottom: 1px solid var(--line);
}

summary {
  position: relative;
  padding: 26px 48px 26px 0;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  position: absolute;
  top: 25px;
  right: 8px;
  color: var(--accent);
  content: "+";
}

details[open] summary::after {
  content: "×";
}

details p {
  max-width: 650px;
  padding: 0 48px 24px 0;
  margin: 0;
}

.final-cta {
  padding-block: 60px 132px;
}

.final-panel {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: end;
  min-height: 420px;
  overflow: hidden;
  padding: clamp(40px, 7vw, 84px);
  border: 1px solid var(--line);
  background: var(--surface);
}

.final-panel h2 {
  max-width: 720px;
  margin-bottom: 24px;
}

.final-panel p:not(.kicker) {
  max-width: 560px;
  margin-bottom: 0;
}

.final-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 210px;
}

.final-signal {
  position: absolute;
  top: -70px;
  right: -70px;
  width: 220px;
  height: 220px;
  border: 1px solid var(--accent);
  border-radius: 50%;
  opacity: 0.35;
}

.final-signal::before,
.final-signal::after {
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--accent);
  content: "";
}

.final-signal::before { width: 1px; height: 280px; transform: translate(-50%, -50%); }
.final-signal::after { width: 280px; height: 1px; transform: translate(-50%, -50%); }

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 30px;
  align-items: center;
  min-height: 140px;
  border-top: 1px solid var(--line-soft);
}

.site-footer p {
  margin: 0;
  color: var(--quiet);
  font-size: 0.76rem;
}

.site-footer > a:last-child {
  justify-self: end;
}

dialog {
  width: min(calc(100% - 32px), 600px);
  padding: 0;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--surface-raised);
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.78);
}

dialog form {
  position: relative;
  padding: clamp(32px, 6vw, 56px);
}

dialog h2 {
  margin: 16px 0 28px;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

dialog ol {
  padding-left: 22px;
  margin-bottom: 28px;
}

dialog li {
  padding: 7px 0;
}

.dialog-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  color: var(--text);
  background: transparent;
  cursor: pointer;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 650ms ease, transform 650ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes scan {
  from { transform: translateX(-110px); }
  to { transform: translateX(150px); }
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 86px;
  }

  .hero-instrument {
    min-height: auto;
  }

  .axis-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .report-body {
    grid-template-columns: 1fr;
  }

  .report-finding {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .faq {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .faq-heading h2 {
    position: static;
  }

  .final-panel {
    grid-template-columns: 1fr;
  }

  .final-actions {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (max-width: 720px) {
  .section-shell,
  .site-header {
    width: min(calc(100% - 28px), var(--max));
  }

  .site-header {
    min-height: 72px;
  }

  .brand small {
    display: none;
  }

  .site-header > .button {
    min-height: 38px;
    padding-inline: 15px;
  }

  .hero {
    gap: 58px;
    padding-block: 72px 90px;
  }

  .hero-instrument {
    min-height: 480px;
  }

  .signal-field {
    min-height: 330px;
  }

  .instrument-readout div {
    padding: 16px 12px;
  }

  .instrument-readout dd {
    font-size: 0.72rem;
  }

  .diagnostic,
  .axes,
  .report,
  .process,
  .faq {
    padding-block: 92px;
  }

  .section-intro {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-bottom: 48px;
  }

  .diagnostic-console {
    grid-template-columns: 1fr;
  }

  .console-rail {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 20px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .step-dots {
    grid-template-columns: repeat(6, 24px);
    gap: 5px;
    margin: 0;
  }

  .step-dots li {
    width: 24px;
    height: 24px;
    font-size: 0.55rem;
  }

  .console-note {
    display: none;
  }

  .console-stage {
    min-height: 510px;
    padding: 30px 20px;
  }

  .answer-button {
    grid-template-columns: 32px 1fr;
    min-height: 70px;
  }

  .answer-key {
    display: none;
  }

  .result-action,
  .report-next {
    grid-template-columns: 1fr;
    gap: 10px;
  }

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

  .axis-card {
    min-height: 260px;
  }

  .axis-card h3 {
    margin-top: 45px;
  }

  .report-head,
  .report-finding,
  .report-next {
    padding-inline: 22px;
  }

  .report-body {
    overflow-x: auto;
  }

  table {
    min-width: 590px;
  }

  .process-list li {
    grid-template-columns: 54px 1fr;
  }

  .final-panel {
    min-height: 500px;
  }

  .final-actions {
    flex-direction: column;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 20px;
    padding-block: 36px;
  }

  .site-footer > a:last-child {
    justify-self: start;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}