:root {
  color-scheme: dark;
  --bg: #0a0e14;
  --bg-elevated: #10161f;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-strong: rgba(255, 255, 255, 0.08);
  --text: #e8eef5;
  --muted: #8b97a8;
  --border: rgba(61, 214, 245, 0.14);
  --border-strong: rgba(61, 214, 245, 0.28);
  --accent: #3dd6f5;
  --accent-dim: #1a8aa3;
  --accent-soft: rgba(61, 214, 245, 0.12);
  --line: rgba(232, 238, 245, 0.08);
  --radius: 4px;
  --container: 1120px;
  --font-display: "Space Grotesk", "Noto Sans TC", sans-serif;
  --font-body: "Noto Sans TC", "PingFang TC", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

body.page-ready .reveal {
  opacity: 1;
  transform: none;
}

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

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.skip {
  position: absolute;
  left: -999px;
  top: 12px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
}

.skip:focus {
  left: 16px;
}

/* —— Tech canvas background —— */
.tech-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(900px 500px at 12% -8%, rgba(61, 214, 245, 0.09), transparent 55%),
    radial-gradient(700px 480px at 88% 8%, rgba(26, 138, 163, 0.08), transparent 50%),
    linear-gradient(180deg, #0a0e14 0%, #0c121a 45%, #0a0e14 100%);
}

.tech-bg__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 20%, transparent 75%);
  opacity: 0.55;
  animation: gridDrift 48s linear infinite;
}

.tech-bg__scan {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0, 0, 0, 0.08) 3px,
    rgba(0, 0, 0, 0.08) 4px
  );
  opacity: 0.35;
}

.tech-bg__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
}

@keyframes gridDrift {
  from {
    background-position: 0 0, 0 0;
  }
  to {
    background-position: 0 48px, 48px 0;
  }
}

.container {
  width: min(100% - 40px, var(--container));
  margin: 0 auto;
}

/* —— Header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(10, 14, 20, 0.78);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--text);
}

.brand-mark span {
  color: var(--accent);
}

.brand-sub {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: center;
}

.nav a {
  position: relative;
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
  padding: 4px 0;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

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

.nav a:hover::after,
.nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  cursor: pointer;
}

/* —— Typography —— */
.eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 3vw, 2.15rem);
}

h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.lead {
  margin: 0 0 28px;
  max-width: 36rem;
  font-size: 1.05rem;
  color: var(--muted);
}

.section-lead {
  margin: 0 0 36px;
  max-width: 40rem;
  color: var(--muted);
}

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

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: min(92vh, 860px);
  display: flex;
  align-items: center;
  padding: 72px 0 88px;
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: 720px;
}

.hero .brand-hero {
  display: block;
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--text);
}

.hero .brand-hero span {
  color: var(--accent);
}

.hero h1 {
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  font-weight: 500;
  color: var(--text);
  max-width: 28ch;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.92rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  text-decoration: none;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #041018;
  font-weight: 600;
}

.btn.primary:hover {
  background: #6ee2f8;
  color: #041018;
}

.btn.is-disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  pointer-events: none;
  cursor: not-allowed;
}

.btn-note {
  margin: 10px 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

/* —— Sections —— */
.section {
  padding: 88px 0;
  border-bottom: 1px solid var(--border);
}

.section.alt {
  background: rgba(16, 22, 31, 0.45);
}

.section-head {
  margin-bottom: 40px;
}

.capability-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}

.capability-list li {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
}

.capability-list .tag {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: 3px;
}

.capability-list p {
  margin: 0;
  color: var(--muted);
}

.capability-list strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
}

.roadmap {
  display: grid;
  gap: 0;
  border-left: 1px solid var(--border-strong);
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.roadmap li {
  position: relative;
  padding: 0 0 28px 28px;
}

.roadmap li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 214, 245, 0.2);
}

.roadmap strong {
  display: block;
  font-family: var(--font-display);
  margin-bottom: 4px;
}

.roadmap p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 32px;
  margin-top: 28px;
}

.meta-item dt {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.meta-item dd {
  margin: 0;
  font-size: 1.05rem;
}

.downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.legal-body {
  max-width: 720px;
}

.legal-body h1 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.legal-body h2 {
  margin-top: 36px;
  font-size: 1.2rem;
}

.legal-body ul {
  padding-left: 1.2rem;
  color: var(--muted);
}

.legal-body li {
  margin-bottom: 8px;
}

.legal-body p {
  color: var(--muted);
}

.legal-body p strong,
.legal-body li strong {
  color: var(--text);
}

.code-panel {
  margin-top: 28px;
  padding: 18px 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}

.code-panel pre {
  margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.82rem;
  line-height: 1.55;
  color: #b8c8d8;
}

.demo-shell {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.demo-player {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 20px;
}

.demo-player__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
}

.demo-player__status {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.demo-player__stage {
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(61, 214, 245, 0.06), transparent 40%),
    #06090e;
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  color: var(--muted);
  font-family: var(--font-display);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.demo-player__stage.is-playing {
  color: var(--accent);
  box-shadow: inset 0 0 60px rgba(61, 214, 245, 0.08);
}

.demo-log {
  min-height: 120px;
  max-height: 220px;
  overflow: auto;
  margin: 0;
  padding: 14px 16px;
  background: #06090e;
  border: 1px solid var(--border);
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  color: #9eb0c2;
  white-space: pre-wrap;
}

/* —— Footer —— */
.site-footer {
  padding: 48px 0 56px;
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 1fr);
  gap: 32px;
}

.footer-col h3 {
  margin: 0 0 14px;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.footer-col a,
.footer-col p {
  display: block;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-col a:hover {
  color: var(--text);
}

.footer-bottom {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.page-hero {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.back-link {
  display: inline-block;
  margin-bottom: 18px;
  font-size: 0.88rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .capability-list li {
    grid-template-columns: 1fr;
    gap: 6px;
  }

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-label {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  font-size: 13px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 28px 8px 10px;
  cursor: pointer;
  font-family: var(--font-display);
}

.lang-select:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(61, 214, 245, 0.18);
}

.edge-hero h1 {
  max-width: 16ch;
}

.slogan {
  margin: 0 0 28px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-top: 8px;
}

.value-item {
  padding: 20px 0;
  border-top: 1px solid var(--border);
}

.value-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 28px;
}

.compare-col {
  padding: 24px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

.compare-col--accent {
  border-color: var(--border-strong);
  box-shadow: inset 0 0 0 1px rgba(61, 214, 245, 0.08);
}

.flow-list {
  margin: 16px 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.flow-list li {
  margin: 10px 0;
}

.market-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0 36px;
}

.market-chips span {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--border);
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--text);
}

.hybrid-note {
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.hybrid-note p {
  margin: 8px 0 0;
  color: var(--muted);
  max-width: 40rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 12px;
}

.price-card {
  padding: 24px 22px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.price-card--featured {
  border-color: var(--accent);
}

.price-tag {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--accent);
}

.price-card ul {
  margin: 0 0 12px;
  padding-left: 1.1rem;
  color: var(--muted);
  flex: 1;
}

.price-card li {
  margin: 8px 0;
}

.footer-cta-block {
  max-width: 40rem;
}

@media (max-width: 900px) {
  .value-grid {
    grid-template-columns: 1fr 1fr;
  }

  .compare-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .header-actions {
    gap: 10px;
  }

  .lang-label {
    display: none;
  }

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

  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 20px 18px;
    background: rgba(10, 14, 20, 0.96);
    border-bottom: 1px solid var(--border);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  .header-inner {
    position: relative;
  }

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

  .hero {
    min-height: auto;
    padding: 56px 0 64px;
  }
}