:root {
  --bg: #071018;
  --bg-elevated: #0c1822;
  --ink: #e8f1f4;
  --muted: #8aa0ab;
  --accent: #3ecfcf;
  --accent-dim: #1a8f8f;
  --line: rgba(232, 241, 244, 0.12);
  --font-display: "Syne", "Avenir Next", sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", sans-serif;
  --max: 68rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #7fe8e8;
}

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

.skip {
  position: absolute;
  left: -999px;
  top: 0;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 20;
  background: var(--bg-elevated);
  padding: 0.5rem 0.75rem;
}

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: rgba(7, 16, 24, 0.55);
  backdrop-filter: blur(8px);
}

.lang-toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 600 0.8125rem/1 var(--font-body);
  letter-spacing: 0.04em;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
}

.lang-toggle button[aria-pressed="true"] {
  background: rgba(62, 207, 207, 0.18);
  color: var(--ink);
}

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 55% at 70% 15%, rgba(62, 207, 207, 0.22), transparent 55%),
    radial-gradient(ellipse 55% 45% at 12% 80%, rgba(26, 90, 140, 0.35), transparent 60%),
    linear-gradient(165deg, #050b10 0%, #0a1620 42%, #071018 100%);
  animation: drift 18s ease-in-out infinite alternate;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(232, 241, 244, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 241, 244, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 20%, transparent 75%);
  opacity: 0.7;
}

@keyframes drift {
  from {
    transform: scale(1) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.04) translate3d(-1.5%, 1%, 0);
  }
}

.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 7.5rem 1.5rem 4.5rem;
  width: 100%;
}

.brand {
  margin: 0 0 1.35rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.2rem, 10vw, 6.5rem);
  letter-spacing: -0.04em;
  line-height: 0.92;
  color: var(--ink);
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s ease forwards 0.1s;
}

.headline {
  margin: 0 0 0.85rem;
  max-width: 18ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 3.4vw, 2.35rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s ease forwards 0.28s;
}

.lede {
  margin: 0 0 1.75rem;
  max-width: 38rem;
  color: var(--muted);
  font-size: 1.125rem;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s ease forwards 0.42s;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s ease forwards 0.55s;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.7rem 1.25rem;
  border-radius: 0.35rem;
  font-family: var(--font-body);
  font-weight: 650;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #042022;
}

.btn-primary:hover {
  background: #7fe8e8;
  color: #042022;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: rgba(62, 207, 207, 0.55);
  color: #7fe8e8;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.25rem 1.5rem;
  border-top: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 2.8vw, 1.9rem);
  letter-spacing: -0.02em;
}

.section p {
  margin: 0 0 1rem;
  max-width: 42rem;
  color: var(--muted);
}

.section p:last-child {
  margin-bottom: 0;
}

.price-list {
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
  max-width: 42rem;
  display: grid;
  gap: 0.65rem;
}

.price-list li {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}

.price-list span {
  color: var(--muted);
  font-size: 0.95rem;
}

.note {
  margin-top: 1rem;
  font-size: 0.92rem;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 1.5rem 3rem;
  background: #050b10;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-meta {
  color: var(--muted);
  font-size: 0.875rem;
}

.footer-meta a {
  color: var(--muted);
}

.page {
  max-width: 44rem;
  margin: 0 auto;
  padding: 5.5rem 1.5rem 4rem;
}

.page h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: -0.03em;
}

.page p,
.page li {
  color: var(--muted);
}

.page ul {
  padding-left: 1.2rem;
}

.page li {
  margin-bottom: 0.55rem;
}

.page-nav {
  margin-bottom: 2rem;
}

.page-nav a {
  color: var(--muted);
  text-decoration: none;
}

.page-nav a:hover {
  color: var(--accent);
}

[data-lang="en"] [data-i18n-zh],
[data-lang="zh"] [data-i18n-en] {
  display: none;
}

@media (max-width: 640px) {
  .hero-inner {
    padding-top: 6.5rem;
    padding-bottom: 3.25rem;
  }

  .price-list li {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}