:root {
  --landing-bg: #f0f9ff;
  --landing-surface: #ffffff;
  --landing-surface-strong: #e0f2fe;
  --landing-text: #082f49;
  --landing-muted: #475569;
  --landing-border: #bae6fd;
  --landing-primary: #0284c7;
  --landing-primary-strong: #0369a1;
  --landing-accent: #f97316;
  --landing-accent-strong: #ea580c;
  --landing-shadow: 0 24px 80px rgba(2, 132, 199, 0.16);
}

.dark {
  --landing-bg: #031521;
  --landing-surface: #0b2435;
  --landing-surface-strong: #0e334a;
  --landing-text: #eff6ff;
  --landing-muted: #b6c8d8;
  --landing-border: #1d4f6b;
  --landing-primary: #38bdf8;
  --landing-primary-strong: #7dd3fc;
  --landing-accent: #fb923c;
  --landing-accent-strong: #fdba74;
  --landing-shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
}

.landing-page {
  min-height: 100vh;
  color: var(--landing-text);
  background:
    radial-gradient(circle at 12% 8%, color-mix(in srgb, var(--landing-primary) 20%, transparent), transparent 28rem),
    linear-gradient(180deg, var(--landing-bg), color-mix(in srgb, var(--landing-bg) 82%, var(--landing-surface)));
  font-family: Inter, "Noto Sans SC", "Noto Sans TC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  letter-spacing: 0;
}

.landing-page a {
  color: inherit;
  text-decoration: none;
}

.landing-language-prompt {
  position: fixed;
  left: 50%;
  bottom: 1rem;
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: min(92vw, 42rem);
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--landing-border);
  border-radius: 999px;
  color: var(--landing-text);
  background: color-mix(in srgb, var(--landing-surface) 94%, transparent);
  box-shadow: var(--landing-shadow);
  transform: translateX(-50%);
}

.landing-language-prompt span {
  color: var(--landing-muted);
  font-size: 0.88rem;
}

.landing-language-prompt a,
.landing-language-prompt button {
  border: 0;
  border-radius: 999px;
  padding: 0.45rem 0.7rem;
  color: #ffffff;
  background: var(--landing-primary);
  font-size: 0.82rem;
  font-weight: 750;
  white-space: nowrap;
  cursor: pointer;
}

.landing-language-prompt button {
  color: var(--landing-muted);
  background: transparent;
}

.landing-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  backdrop-filter: blur(18px);
}

.landing-brand img {
  display: block;
  width: auto;
  height: 2.25rem;
}

.landing-nav-links,
.landing-capsule,
.landing-segmented,
.landing-nav-actions,
.landing-actions,
.landing-metrics,
.landing-footer > div {
  display: flex;
  align-items: center;
}

.landing-nav-actions {
  justify-content: flex-end;
  gap: 0.65rem;
  min-width: 0;
}

.landing-nav-links {
  justify-content: center;
  gap: 1.4rem;
  font-size: 0.92rem;
  color: var(--landing-muted);
}

.landing-nav-links a,
.landing-footer a {
  transition: color 180ms ease;
}

.landing-nav-links a:hover,
.landing-footer a:hover {
  color: var(--landing-primary);
}

.landing-capsule {
  gap: 0.35rem;
  justify-content: flex-end;
  flex-wrap: nowrap;
  min-width: 0;
  padding: 0.25rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--landing-border) 82%, transparent);
  background: color-mix(in srgb, var(--landing-surface) 86%, transparent);
  box-shadow: 0 12px 30px rgba(2, 132, 199, 0.08);
}

.landing-segmented {
  gap: 0.2rem;
  flex-wrap: nowrap;
}

.landing-segmented a,
.landing-toggle {
  flex: 0 0 auto;
  min-height: 2rem;
  padding: 0.4rem 0.62rem;
  border-radius: 999px;
  color: var(--landing-muted);
  font-size: 0.8rem;
  font-weight: 400;
  cursor: pointer;
}

.landing-segmented a.active {
  color: #ffffff;
  background: var(--landing-primary);
  font-weight: 400;
}

.landing-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.35rem;
  border: 0;
  color: var(--landing-text);
  background: transparent;
}

.landing-page .landing-toggle .landing-icon {
  width: 1.75rem;
  height: 1.75rem;
}

.landing-page .landing-toggle .landing-icon path {
  stroke-width: 2.15;
}

.landing-capsule-divider {
  color: color-mix(in srgb, var(--landing-muted) 55%, transparent);
  font-size: 0.9rem;
}

.landing-menu-toggle {
  display: none;
  flex: 0 0 2.55rem;
  width: 2.55rem;
  height: 2.55rem;
  padding: 0;
  border: 1px solid color-mix(in srgb, var(--landing-border) 82%, transparent);
  border-radius: 999px;
  color: var(--landing-text);
  background: color-mix(in srgb, var(--landing-surface) 86%, transparent);
  box-shadow: 0 12px 30px rgba(2, 132, 199, 0.08);
  cursor: pointer;
}

.landing-menu-toggle span {
  display: block;
  width: 1.08rem;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}

.landing-hero,
.landing-section,
.landing-cta,
.landing-footer {
  max-width: 1180px;
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.landing-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(430px, 1.22fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: start;
  min-height: calc(100vh - 5.2rem);
  padding-top: clamp(4rem, 10vh, 5.2rem);
  padding-bottom: 4rem;
}

.landing-eyebrow {
  display: inline-flex;
  margin: 0 0 1rem;
  padding: 0.42rem 0.8rem;
  border: 1px solid var(--landing-border);
  border-radius: 999px;
  color: var(--landing-primary-strong);
  background: color-mix(in srgb, var(--landing-surface) 78%, transparent);
  font-size: 0.86rem;
  font-weight: 750;
}

.landing-hero h1,
.auth-brand-title {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(1.62rem, 2.75vw, 2.34rem);
  line-height: 1.12;
  font-weight: 850;
  letter-spacing: 0;
  white-space: pre-line;
}

.landing-hero-subtitle {
  max-width: 36rem;
  margin: 1.35rem 0 0;
  color: var(--landing-muted);
  font-size: 1.125rem;
  line-height: 1.8;
  white-space: pre-line;
}

.landing-showcase-copy {
  margin-top: 6.9rem;
}

.landing-actions {
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.landing-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.85rem 1.15rem;
  border-radius: 0.7rem;
  font-weight: 800;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
  cursor: pointer;
}

.landing-page .landing-button-primary {
  color: #ffffff;
  background: var(--landing-accent);
}

.landing-page .landing-button-primary:visited {
  color: #ffffff;
}

.landing-page .landing-button-primary:hover {
  color: #ffffff;
  background: var(--landing-accent-strong);
}

.landing-button-secondary {
  border: 1px solid var(--landing-border);
  color: var(--landing-primary-strong);
  background: color-mix(in srgb, var(--landing-surface) 82%, transparent);
}

.landing-metrics {
  gap: 1.3rem;
  flex-wrap: wrap;
  margin: 2.4rem 0 0;
}

.landing-metrics div {
  min-width: 8rem;
}

.landing-metrics dt {
  color: var(--landing-primary-strong);
  font-size: 1.7rem;
  font-weight: 850;
}

.landing-metrics dd {
  margin: 0.2rem 0 0;
  color: var(--landing-muted);
  font-size: 0.9rem;
}

.landing-showcase {
  position: relative;
  min-height: 33rem;
  border: 1px solid var(--landing-border);
  border-radius: 1.2rem;
  background: color-mix(in srgb, var(--landing-surface) 88%, transparent);
  box-shadow: var(--landing-shadow);
  overflow: hidden;
}

.landing-showcase figure {
  position: absolute;
  inset: 0.75rem;
  margin: 0;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.landing-showcase figure.active {
  opacity: 1;
  transform: translateY(0);
}

.landing-showcase img {
  display: block;
  width: 100%;
  height: calc(100% - 2.55rem);
  object-fit: contain;
  border-radius: 0.75rem;
  background: var(--landing-surface);
}

.landing-showcase figcaption {
  position: absolute;
  right: 5rem;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: center;
  min-height: 2rem;
  padding: 0;
  color: var(--landing-muted);
  font-weight: 700;
}

.landing-dots {
  position: absolute;
  right: 1rem;
  bottom: calc(0.75rem + (2rem - 0.62rem) / 2);
  display: flex;
  gap: 0.45rem;
}

.landing-dots button {
  width: 0.62rem;
  height: 0.62rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: color-mix(in srgb, var(--landing-primary) 28%, var(--landing-border));
  cursor: pointer;
}

.landing-dots button.active {
  width: 1.65rem;
  background: var(--landing-primary);
}

.landing-section {
  padding-top: 5.5rem;
  padding-bottom: 1rem;
  scroll-margin-top: 6rem;
}

.landing-cta {
  scroll-margin-top: 7rem;
}

.landing-section-heading {
  max-width: 45rem;
  margin-bottom: 2rem;
}

.landing-section-heading h2,
.landing-cta h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.12;
  font-weight: 850;
}

.landing-section-heading p,
.landing-cta p {
  margin: 0.8rem 0 0;
  color: var(--landing-muted);
  font-size: 1rem;
  line-height: 1.8;
}

.landing-feature-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1rem;
}

.landing-card {
  grid-column: span 2;
  min-height: 17rem;
  padding: 1.25rem;
  border: 1px solid var(--landing-border);
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--landing-surface) 88%, transparent);
}

.landing-card:nth-child(1),
.landing-card:nth-child(2) {
  grid-column: span 3;
}

.landing-icon {
  width: 2.25rem;
  height: 2.25rem;
  color: var(--landing-primary);
}

.landing-card h3,
.landing-steps h3,
.landing-scenarios h3 {
  margin: 1rem 0 0;
  font-size: 1.125rem;
  font-weight: 800;
}

.landing-card p,
.landing-steps p,
.landing-scenarios p,
.landing-faq p {
  margin: 0.7rem 0 0;
  color: var(--landing-muted);
  font-size: 1rem;
  line-height: 1.75;
  white-space: pre-line;
}

.landing-steps,
.landing-scenarios {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.landing-steps {
  position: relative;
  gap: 0;
  border: 1px solid var(--landing-border);
  border-radius: 0.75rem;
  background: color-mix(in srgb, var(--landing-surface) 88%, transparent);
  overflow: hidden;
}

.landing-steps article,
.landing-scenarios article,
.landing-faq details {
  border: 1px solid var(--landing-border);
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--landing-surface) 88%, transparent);
}

.landing-steps article {
  position: relative;
  border: 0;
  border-radius: 0;
  background: transparent;
  padding: 1.5rem;
}

.landing-steps article + article {
  border-left: 1px solid var(--landing-border);
}

.landing-scenarios article {
  padding: 1.25rem;
}

.landing-steps span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 999px;
  color: #ffffff;
  background: var(--landing-accent);
  font-size: 1.1rem;
  font-weight: 850;
}

.landing-steps article:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 2.6rem;
  right: -0.42rem;
  z-index: 2;
  width: 0.82rem;
  height: 0.82rem;
  border-top: 1px solid var(--landing-border);
  border-right: 1px solid var(--landing-border);
  background: var(--landing-surface);
  transform: rotate(45deg);
}

.landing-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin-top: 5.5rem;
  padding-top: 2rem;
  padding-bottom: 2rem;
  border: 1px solid var(--landing-border);
  border-radius: 0.75rem;
  background: linear-gradient(135deg, var(--landing-surface-strong), var(--landing-surface));
}

.landing-faq {
  display: grid;
  gap: 0.75rem;
}

.landing-faq details {
  padding: 1rem 1.1rem;
}

.landing-faq summary {
  color: var(--landing-text);
  font-weight: 800;
  cursor: pointer;
}

.landing-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 4rem;
  padding-bottom: 2.5rem;
  color: var(--landing-muted);
  font-size: 0.9rem;
}

.landing-footer > div {
  gap: 1rem;
  flex-wrap: wrap;
}

.landing-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .landing-nav {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.8rem;
    padding: 0.75rem 1rem;
  }

  .landing-nav-links {
    display: none;
    position: absolute;
    top: calc(100% + 0.35rem);
    right: 1rem;
    left: 1rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.35rem;
    padding: 0.45rem;
    border: 1px solid color-mix(in srgb, var(--landing-border) 82%, transparent);
    border-radius: 0.9rem;
    background: color-mix(in srgb, var(--landing-surface) 92%, transparent);
    box-shadow: 0 14px 36px rgba(2, 132, 199, 0.1);
  }

  .landing-nav-links.open {
    display: grid;
  }

  .landing-nav-links a {
    padding: 0.62rem 0.72rem;
    border-radius: 0.62rem;
    background: color-mix(in srgb, var(--landing-surface-strong) 40%, transparent);
  }

  .landing-capsule {
    justify-content: flex-end;
  }

  .landing-menu-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
  }

  .landing-hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 2rem;
  }

  .landing-showcase-copy {
    margin-top: 0;
  }

  .landing-showcase {
    min-height: 26rem;
  }

  .landing-card,
  .landing-card:nth-child(1),
  .landing-card:nth-child(2) {
    grid-column: span 6;
    min-height: auto;
  }

  .landing-steps,
  .landing-scenarios {
    grid-template-columns: 1fr;
  }

  .landing-steps article + article {
    border-top: 1px solid var(--landing-border);
    border-left: 0;
  }

  .landing-steps article:not(:last-child)::after {
    top: auto;
    right: auto;
    bottom: -0.42rem;
    left: 2.7rem;
    transform: rotate(135deg);
  }
}

@media (max-width: 640px) {
  .landing-language-prompt {
    right: 0.75rem;
    left: 0.75rem;
    flex-wrap: wrap;
    border-radius: 0.75rem;
    transform: none;
  }

  .landing-segmented {
    overflow-x: auto;
    max-width: 100%;
  }

  .landing-brand img {
    height: 1.95rem;
  }

  .landing-nav-actions {
    gap: 0.45rem;
  }

  .landing-segmented a,
  .landing-toggle {
    min-height: 1.85rem;
    padding: 0.34rem 0.5rem;
    font-size: 0.76rem;
  }

  .landing-toggle {
    width: 2rem;
  }

  .landing-page .landing-toggle .landing-icon {
    width: 1.45rem;
    height: 1.45rem;
  }

  .landing-menu-toggle {
    flex-basis: 2.25rem;
    width: 2.25rem;
    height: 2.25rem;
  }

  .landing-hero h1,
  .auth-brand-title {
    max-width: 20ch;
    font-size: 1.72rem;
  }

  .landing-showcase {
    min-height: 20rem;
  }

  .landing-showcase figure {
    inset: 0.7rem;
  }

  .landing-cta,
  .landing-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 360px) {
  .landing-brand img {
    height: 1.65rem;
  }

  .landing-segmented a,
  .landing-toggle {
    min-height: 1.72rem;
    padding: 0.3rem 0.42rem;
    font-size: 0.72rem;
  }

  .landing-toggle {
    width: 1.85rem;
  }

  .landing-page .landing-toggle .landing-icon {
    width: 1.3rem;
    height: 1.3rem;
  }

  .landing-menu-toggle {
    flex-basis: 2.1rem;
    width: 2.1rem;
    height: 2.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .landing-page *,
  .landing-page *::before,
  .landing-page *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}