:root {
  --黑: #000000;
  --白: #ffffff;
  --黃: #ffed4e;
  --青: #00f0ff;
  --洋紅: #ff006e;
  --邊框: 4px solid var(--黑);
  --陰影: 8px 8px 0 var(--黑);
  --陰影小: 6px 6px 0 var(--黑);
  --圓角: 0;
  --內容寬度: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--黑);
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.06) 1px, transparent 1px),
    linear-gradient(180deg, rgba(0, 0, 0, 0.06) 1px, transparent 1px),
    linear-gradient(135deg, #ffffff 0%, #ffffff 60%, #ffed4e 60%, #ffed4e 72%, #ffffff 72%);
  background-size: 36px 36px, 36px 36px, 100% 100%;
  font-family: "Space Mono", monospace;
  font-weight: 700;
  line-height: 1.6;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: -1;
}

body::before {
  top: 90px;
  right: 16px;
  width: 220px;
  height: 220px;
  background: var(--青);
  border: var(--邊框);
  box-shadow: var(--陰影);
}

body::after {
  left: 16px;
  bottom: 24px;
  width: 180px;
  height: 180px;
  background: var(--洋紅);
  border: var(--邊框);
  box-shadow: var(--陰影);
}

::selection {
  color: var(--白);
  background: var(--黑);
}

a,
button,
input,
textarea,
label {
  font: inherit;
}

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

button {
  border: 0;
  background: none;
  cursor: pointer;
}

img {
  max-width: 100%;
  display: block;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  z-index: 1000;
  padding: 0.85rem 1rem;
  color: var(--白);
  background: var(--黑);
  border: var(--邊框);
  box-shadow: var(--陰影);
}

.skip-link:focus {
  left: 12px;
}

.background-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    linear-gradient(transparent 95%, rgba(0, 0, 0, 0.12) 100%),
    linear-gradient(90deg, transparent 95%, rgba(0, 0, 0, 0.12) 100%);
  background-size: 56px 56px;
  opacity: 0.25;
}

.topbar,
.hero,
.content,
.footer {
  width: min(var(--內容寬度), calc(100% - 32px));
  margin: 0 auto;
}

.neo-panel {
  border: var(--邊框);
  border-radius: var(--圓角);
  background: var(--白);
  box-shadow: var(--陰影);
}

.topbar {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
  padding: 1rem;
  margin-top: 1rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--白);
  z-index: -1;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  min-width: 72px;
  min-height: 72px;
  padding: 0.5rem;
  background: var(--黃);
  border: var(--邊框);
  box-shadow: var(--陰影);
  font-family: "Space Grotesk", sans-serif;
  font-weight: 900;
  text-transform: uppercase;
  font-size: 1.5rem;
}

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

.brand-text strong {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 1.1rem;
}

.brand-text small {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link,
.neo-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0.8rem 1rem;
  border: var(--邊框);
  border-radius: var(--圓角);
  background: var(--白);
  box-shadow: var(--陰影);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.nav-link {
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nav-link:hover,
.neo-button:hover {
  box-shadow: var(--陰影小);
  transform: translate(-2px, -2px);
}

.nav-link:active,
.neo-button:active {
  box-shadow: none;
  transform: translate(8px, 8px);
}

.hero,
.content {
  margin-top: 2rem;
}

.section-grid {
  display: grid;
  gap: 2rem;
}

.hero {
  grid-template-columns: 1.2fr 0.8fr;
}

.hero-copy,
.hero-side,
.info-card,
.step-card,
.list-card,
.contact-form,
.contact-side {
  padding: 2rem;
}

.hero-copy {
  background: var(--白);
}

.hero-copy,
.hero-side,
.contact-form,
.contact-side {
  min-height: 100%;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.45rem 0.7rem;
  background: var(--黃);
  border: var(--邊框);
  box-shadow: var(--陰影);
  font-family: "Space Grotesk", sans-serif;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.85rem;
}

h1,
h2,
h3,
.stat-value {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 0.95;
}

h1 {
  font-size: clamp(3rem, 7vw, 6rem);
  max-width: 10ch;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
}

h3 {
  font-size: 1.6rem;
}

.lead,
.info-card p,
.step-card p,
.list-card p,
.contact-form label span,
.contact-side p,
.footer p {
  margin: 0;
  font-size: 1rem;
}

.lead {
  max-width: 62ch;
  margin-top: 1.25rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.75rem;
}

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

.button-secondary {
  background: var(--青);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.75rem;
}

.tag,
.card-number,
.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.35rem 0.75rem;
  border: var(--邊框);
  background: var(--白);
  box-shadow: var(--陰影);
  text-transform: uppercase;
}

.tag {
  background: var(--白);
}

.hero-side {
  display: grid;
  gap: 2rem;
  background: var(--白);
}

.stat-block {
  padding: 1.25rem;
  border: var(--邊框);
  box-shadow: var(--陰影);
}

.accent-yellow {
  background: var(--黃);
}

.accent-cyan {
  background: var(--青);
}

.accent-magenta {
  background: var(--洋紅);
  color: var(--白);
}

.stat-label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  text-transform: uppercase;
}

.stat-value {
  display: block;
  font-size: 1.5rem;
}

.stat-grid,
.cards-grid,
.steps-grid,
.split-grid,
.contact-grid {
  display: grid;
  gap: 2rem;
}

.stat-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mini-card {
  display: grid;
  gap: 0.75rem;
  padding: 1rem;
  border: var(--邊框);
  background: var(--白);
  box-shadow: var(--陰影);
}

.mini-card span {
  display: inline-flex;
  width: fit-content;
  padding: 0.35rem 0.55rem;
  background: var(--黃);
  border: var(--邊框);
  box-shadow: var(--陰影);
  text-transform: uppercase;
}

.mini-card h2 {
  font-size: 1.3rem;
}

.cards-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card,
.step-card,
.list-card,
.contact-form,
.contact-side {
  background: var(--白);
}

.info-card {
  display: grid;
  gap: 1rem;
}

.info-card p,
.step-card p,
.list-card p,
.contact-side p {
  line-height: 1.8;
}

.card-number {
  width: fit-content;
  background: var(--黃);
}

.steps-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.step-card {
  display: grid;
  gap: 1rem;
}

.step-badge {
  width: fit-content;
  background: var(--洋紅);
  color: var(--白);
}

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

.list-card {
  display: grid;
  gap: 1.25rem;
}

.clean-list {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.75rem;
}

.contact-grid {
  grid-template-columns: 1fr 0.85fr;
}

.contact-form {
  display: grid;
  gap: 1.25rem;
}

.contact-form label {
  display: grid;
  gap: 0.6rem;
}

.contact-form label span {
  text-transform: uppercase;
}

.neo-input {
  width: 100%;
  min-height: 56px;
  padding: 0.9rem 1rem;
  border: var(--邊框);
  border-radius: var(--圓角);
  background: var(--白);
  box-shadow: var(--陰影);
  color: var(--黑);
  resize: vertical;
}

.neo-input::placeholder {
  color: rgba(0, 0, 0, 0.65);
  text-transform: none;
}

.neo-input:focus {
  outline: 0;
  box-shadow: var(--陰影小);
  transform: translate(-2px, -2px);
}

.checkbox-row {
  display: flex !important;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border: var(--邊框);
  background: var(--黃);
  box-shadow: var(--陰影);
}

.checkbox-row input[type="checkbox"] {
  appearance: none;
  width: 24px;
  height: 24px;
  margin: 0;
  background: var(--白);
  border: var(--邊框);
  box-shadow: 4px 4px 0 var(--黑);
  display: grid;
  place-items: center;
}

.checkbox-row input[type="checkbox"]::before {
  content: "";
  width: 12px;
  height: 12px;
  background: transparent;
}

.checkbox-row input[type="checkbox"]:checked::before {
  background: var(--洋紅);
}

.full-width {
  width: 100%;
}

.contact-side {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.note-box {
  padding: 1rem;
  border: var(--邊框);
  background: var(--黃);
  box-shadow: var(--陰影);
}

.note-box code {
  padding: 0.2rem 0.35rem;
  background: var(--白);
  border: var(--邊框);
  box-shadow: 4px 4px 0 var(--黑);
}

.footer {
  margin-top: 2rem;
  margin-bottom: 2rem;
  padding: 1rem 2rem;
  background: var(--黃);
  text-align: center;
}

.install-button {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 60;
  background: var(--洋紅);
  color: var(--白);
}

.neo-panel:hover {
  box-shadow: var(--陰影小);
  transform: translate(-2px, -2px);
}

.neo-panel:active {
  box-shadow: none;
  transform: translate(8px, 8px);
}

.accent-yellow,
.accent-cyan,
.accent-magenta {
  color: var(--黑);
}

.accent-magenta .step-badge,
.accent-magenta .card-number,
.accent-magenta .tag,
.accent-magenta h3,
.accent-magenta p,
.accent-magenta .stat-label,
.accent-magenta .stat-value {
  color: var(--白);
}

.accent-magenta .neo-button {
  color: var(--黑);
}

.accent-magenta .mini-card {
  background: var(--白);
  color: var(--黑);
}

.accent-magenta .mini-card span {
  color: var(--黑);
}

@media (max-width: 960px) {
  .topbar,
  .hero,
  .contact-grid,
  .cards-grid,
  .steps-grid,
  .split-grid,
  .stat-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    position: static;
  }

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

@media (max-width: 640px) {
  body::before,
  body::after {
    display: none;
  }

  .topbar,
  .hero,
  .content,
  .footer {
    width: min(calc(100% - 20px), var(--內容寬度));
  }

  .hero-copy,
  .hero-side,
  .info-card,
  .step-card,
  .list-card,
  .contact-form,
  .contact-side {
    padding: 1.25rem;
  }

  .button-row,
  .tag-row {
    flex-direction: column;
  }

  .nav-link,
  .neo-button,
  .checkbox-row,
  .neo-input {
    width: 100%;
  }

  .brand {
    width: 100%;
    justify-content: flex-start;
  }
}