:root {
  color-scheme: dark;
  --bg: #0c0b0a;
  --bg-soft: #131210;
  --panel: rgba(28, 27, 24, 0.82);
  --panel-strong: #1c1b18;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f7f7f3;
  --muted: #aaa9a2;
  --accent: #12a0b8;
  --accent-light: #6ad4e5;
  --accent-dark: #087f93;
  --success: #57cc80;
  --warning: #f2a640;
  --max: 1180px;
  --reading: 820px;
  --radius-lg: 30px;
  --radius-md: 20px;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.42);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

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

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 70% 0%, rgba(18, 160, 184, 0.14), transparent 32rem),
    radial-gradient(circle at 0% 28%, rgba(44, 93, 121, 0.11), transparent 26rem),
    var(--bg);
  line-height: 1.65;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  content: "";
  pointer-events: none;
  opacity: 0.17;
  background-image: url("assets/launch-cover.jpg");
  background-position: 50% 10%;
  background-size: cover;
  mask-image: linear-gradient(to bottom, #000 0, transparent 68%);
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--accent-light);
  outline-offset: 4px;
  border-radius: 8px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  color: #051012;
  background: var(--accent-light);
  border-radius: 10px;
  transform: translateY(-150%);
}

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

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid transparent;
  background: rgba(12, 11, 10, 0.72);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 40px), var(--max));
  min-height: 74px;
  margin: 0 auto;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 11px;
  font-size: 1.01rem;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35);
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
}

.nav-links a,
.language-toggle {
  padding: 8px 12px;
  color: var(--muted);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 620;
  background: transparent;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  transition: color 160ms ease, background 160ms ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"],
.language-toggle:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.07);
}

.language-toggle {
  margin-left: 4px;
  color: var(--accent-light);
  border: 1px solid rgba(106, 212, 229, 0.28);
}

html[data-language="en"] [data-lang="zh"],
html[data-language="zh"] [data-lang="en"] {
  display: none !important;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.82fr);
  align-items: center;
  min-height: 760px;
  padding: 92px 0 88px;
  gap: clamp(44px, 7vw, 100px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  margin: 0 0 22px;
  gap: 9px;
  color: var(--accent-light);
  font-size: 0.83rem;
  font-weight: 760;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 22px;
  height: 1px;
  content: "";
  background: currentColor;
}

.hero h1,
.page-hero h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(3.5rem, 8vw, 7.5rem);
  line-height: 0.92;
  letter-spacing: -0.072em;
}

.hero h1 span {
  display: block;
  margin-top: 16px;
  color: transparent;
  background: linear-gradient(120deg, var(--accent-light), var(--accent), #5386b8);
  background-clip: text;
  -webkit-background-clip: text;
}

.hero-copy {
  max-width: 670px;
  margin: 30px 0 0;
  color: #c8c8c2;
  font-size: clamp(1.06rem, 1.7vw, 1.3rem);
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  margin-top: 34px;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  gap: 9px;
  color: #041012;
  font-weight: 750;
  background: var(--accent-light);
  border: 1px solid transparent;
  border-radius: 14px;
  box-shadow: 0 10px 32px rgba(18, 160, 184, 0.2);
  transition: transform 160ms ease, filter 160ms ease;
}

.button:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
}

.button.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--line);
  box-shadow: none;
}

.button svg,
.inline-link svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.availability {
  display: flex;
  align-items: center;
  margin-top: 22px;
  gap: 10px;
  color: var(--muted);
  font-size: 0.88rem;
}

.availability::before {
  width: 8px;
  height: 8px;
  content: "";
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(87, 204, 128, 0.12);
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 570px;
}

.hero-orbit {
  position: absolute;
  width: min(100%, 520px);
  aspect-ratio: 1;
  border: 1px solid rgba(106, 212, 229, 0.16);
  border-radius: 50%;
  box-shadow: inset 0 0 90px rgba(18, 160, 184, 0.05);
}

.hero-orbit::before,
.hero-orbit::after {
  position: absolute;
  inset: 14%;
  content: "";
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: inherit;
}

.hero-orbit::after {
  inset: 30%;
}

.hero-icon {
  position: relative;
  z-index: 1;
  width: min(57%, 292px);
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: 25%;
  background: #08090d;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 42px 100px rgba(0, 0, 0, 0.62), 0 0 80px rgba(18, 160, 184, 0.15);
}

.visual-note {
  position: absolute;
  z-index: 2;
  right: 1%;
  bottom: 11%;
  width: min(245px, 52%);
  padding: 17px 18px;
  background: rgba(26, 26, 23, 0.88);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.visual-note strong,
.visual-note span {
  display: block;
}

.visual-note strong {
  margin-bottom: 3px;
  font-size: 0.94rem;
}

.visual-note span {
  color: var(--muted);
  font-size: 0.78rem;
}

.section {
  padding: 110px 0;
}

.section.compact {
  padding: 78px 0;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.55fr);
  align-items: end;
  margin-bottom: 46px;
  gap: 40px;
}

.section-heading h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(2.25rem, 4.6vw, 4.7rem);
  line-height: 1.02;
  letter-spacing: -0.052em;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature-card,
.info-card,
.support-card,
.legal-card {
  position: relative;
  overflow: hidden;
  padding: 28px;
  background: linear-gradient(145deg, rgba(31, 30, 27, 0.92), rgba(20, 19, 17, 0.88));
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.feature-card::after {
  position: absolute;
  right: -30px;
  bottom: -44px;
  width: 140px;
  height: 140px;
  content: "";
  background: radial-gradient(circle, rgba(18, 160, 184, 0.13), transparent 68%);
}

.feature-number {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin-bottom: 50px;
  color: var(--accent-light);
  font-size: 0.76rem;
  font-weight: 780;
  background: rgba(18, 160, 184, 0.11);
  border: 1px solid rgba(106, 212, 229, 0.18);
  border-radius: 50%;
}

.feature-card h3,
.info-card h3,
.support-card h2,
.support-card h3 {
  margin: 0 0 10px;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
}

.feature-card p,
.info-card p,
.support-card p {
  margin: 0;
  color: var(--muted);
}

.device-showcase {
  position: relative;
  display: grid;
  grid-template-columns: minmax(210px, 0.53fr) minmax(420px, 1fr);
  align-items: end;
  padding: 70px 6% 0;
  gap: 4%;
  background:
    linear-gradient(155deg, rgba(18, 160, 184, 0.13), transparent 45%),
    var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.device {
  overflow: hidden;
  border: 9px solid #050505;
  background: #050505;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.5);
}

.device.phone {
  border-radius: 34px 34px 0 0;
}

.device.tablet {
  border-radius: 26px 26px 0 0;
}

.device img {
  width: 100%;
}

.privacy-banner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  overflow: hidden;
  padding: clamp(34px, 7vw, 76px);
  gap: 60px;
  background: linear-gradient(135deg, rgba(18, 160, 184, 0.18), rgba(20, 19, 17, 0.95) 46%);
  border: 1px solid rgba(106, 212, 229, 0.2);
  border-radius: var(--radius-lg);
}

.privacy-banner h2 {
  margin: 0 0 18px;
  font-size: clamp(2.2rem, 4.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.052em;
}

.privacy-banner p {
  max-width: 650px;
  margin: 0;
  color: #c6c8c2;
}

.privacy-points {
  display: grid;
  gap: 12px;
}

.privacy-point {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 14px 16px;
  gap: 12px;
  font-size: 0.92rem;
  font-weight: 680;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.privacy-point::before {
  display: grid;
  place-items: center;
  width: 25px;
  height: 25px;
  flex: 0 0 auto;
  content: "✓";
  color: #061012;
  font-size: 0.78rem;
  font-weight: 900;
  background: var(--accent-light);
  border-radius: 50%;
}

.page-hero {
  padding: 110px 0 64px;
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  max-width: 960px;
  font-size: clamp(3.2rem, 7vw, 6.8rem);
}

.page-hero p {
  max-width: 780px;
  margin: 28px 0 0;
  color: #c3c3bd;
  font-size: 1.12rem;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  margin-top: 26px;
  gap: 9px;
}

.pill {
  padding: 7px 11px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 670;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--line);
  border-radius: 99px;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  align-items: start;
  padding: 72px 0 112px;
  gap: 70px;
}

.reading-column {
  max-width: var(--reading);
}

.reading-column article > :first-child {
  margin-top: 0;
}

.reading-column h2 {
  margin: 54px 0 14px;
  font-size: clamp(1.42rem, 2vw, 1.82rem);
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.reading-column h3 {
  margin: 32px 0 10px;
  font-size: 1.1rem;
}

.reading-column p,
.reading-column li {
  color: #bbbcb5;
}

.reading-column p {
  margin: 0 0 16px;
}

.reading-column ul,
.reading-column ol {
  margin: 14px 0 20px;
  padding-left: 1.35rem;
}

.reading-column li {
  margin: 8px 0;
  padding-left: 5px;
}

.reading-column strong {
  color: var(--text);
}

.callout {
  margin: 0 0 42px;
  padding: 22px 24px;
  color: #d7e8e9;
  background: rgba(18, 160, 184, 0.1);
  border: 1px solid rgba(106, 212, 229, 0.22);
  border-radius: 16px;
}

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

.side-nav {
  position: sticky;
  top: 100px;
  padding: 18px;
  background: rgba(25, 24, 21, 0.74);
  border: 1px solid var(--line);
  border-radius: 16px;
  backdrop-filter: blur(16px);
}

.side-nav strong {
  display: block;
  margin-bottom: 8px;
  padding: 0 8px;
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.side-nav a {
  display: block;
  padding: 8px;
  color: var(--muted);
  font-size: 0.86rem;
  border-radius: 8px;
}

.side-nav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.055);
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 58px;
  gap: 16px;
}

.support-card.primary {
  grid-column: 1 / -1;
  padding: clamp(28px, 5vw, 48px);
  background: linear-gradient(135deg, rgba(18, 160, 184, 0.16), rgba(27, 26, 23, 0.92));
  border-color: rgba(106, 212, 229, 0.2);
}

.support-card .button-row {
  margin-top: 24px;
}

.spec-list {
  display: grid;
  grid-template-columns: 145px 1fr;
  margin: 20px 0 0;
  gap: 12px 20px;
  font-size: 0.93rem;
}

.spec-list dt {
  color: var(--muted);
}

.spec-list dd {
  margin: 0;
  color: var(--text);
}

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

details.faq,
details.license-item {
  background: rgba(26, 25, 22, 0.78);
  border: 1px solid var(--line);
  border-radius: 16px;
}

details.faq summary,
details.license-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 22px;
  gap: 16px;
  font-weight: 720;
  cursor: pointer;
  list-style: none;
}

details.faq summary::-webkit-details-marker,
details.license-item summary::-webkit-details-marker {
  display: none;
}

details.faq summary::after,
details.license-item summary::after {
  content: "+";
  color: var(--accent-light);
  font-size: 1.25rem;
  font-weight: 450;
}

details[open].faq summary::after,
details[open].license-item summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 22px 22px;
}

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

.license-list {
  display: grid;
  gap: 14px;
}

.license-summary {
  display: flex;
  align-items: center;
  gap: 12px;
}

.license-badge {
  padding: 4px 8px;
  color: var(--accent-light);
  font-size: 0.69rem;
  background: rgba(18, 160, 184, 0.12);
  border: 1px solid rgba(106, 212, 229, 0.2);
  border-radius: 99px;
}

.license-body {
  padding: 0 22px 24px;
}

.license-body pre {
  overflow: auto;
  max-height: 520px;
  margin: 18px 0 0;
  padding: 18px;
  color: #cacbc4;
  font: 0.78rem/1.55 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
  background: #0b0b0a;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 12px;
}

.inline-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-light);
  font-weight: 680;
}

.inline-link:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(9, 9, 8, 0.74);
}

.footer-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  width: min(calc(100% - 40px), var(--max));
  min-height: 190px;
  margin: 0 auto;
  padding: 48px 0;
  gap: 30px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  margin-bottom: 12px;
  gap: 10px;
  font-weight: 740;
}

.footer-brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.footer-copy,
.footer-links {
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-copy p {
  margin: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 16px;
}

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

.error-page {
  display: grid;
  place-items: center;
  min-height: calc(100vh - 265px);
  padding: 80px 20px;
  text-align: center;
}

.error-page h1 {
  margin: 0;
  font-size: clamp(5rem, 15vw, 11rem);
  line-height: 0.9;
  letter-spacing: -0.07em;
}

.error-page p {
  margin: 22px 0 0;
  color: var(--muted);
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 82px;
  }

  .hero-copy {
    max-width: 760px;
  }

  .hero-visual {
    min-height: 490px;
  }

  .hero-orbit {
    width: 470px;
    max-width: 86vw;
  }

  .hero-icon {
    width: 230px;
  }

  .visual-note {
    right: 15%;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-heading,
  .privacy-banner {
    grid-template-columns: 1fr;
  }

  .content-layout {
    grid-template-columns: 1fr;
  }

  .side-nav {
    position: static;
    display: none;
  }
}

@media (min-width: 681px) {
  .hero [data-lang="zh"] h1 {
    font-size: clamp(3.5rem, 6.6vw, 6.4rem);
  }

  .hero [data-lang="zh"] h1 span {
    white-space: nowrap;
  }
}

@media (max-width: 680px) {
  .nav-wrap,
  .container,
  .footer-wrap {
    width: min(calc(100% - 28px), var(--max));
  }

  .nav-wrap {
    min-height: 64px;
  }

  .brand span {
    display: none;
  }

  .nav-links a.hide-mobile {
    display: none;
  }

  .nav-links a,
  .language-toggle {
    padding: 7px 9px;
    font-size: 0.82rem;
  }

  .hero {
    padding: 72px 0 54px;
    gap: 20px;
  }

  .hero h1 {
    font-size: clamp(3.3rem, 18vw, 5.6rem);
  }

  .hero-visual {
    min-height: 410px;
  }

  .hero-icon {
    width: 190px;
  }

  .visual-note {
    right: 1%;
    bottom: 5%;
  }

  .section {
    padding: 76px 0;
  }

  .section-heading {
    margin-bottom: 30px;
    gap: 18px;
  }

  .feature-grid,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .feature-card {
    padding: 24px;
  }

  .feature-number {
    margin-bottom: 32px;
  }

  .device-showcase {
    grid-template-columns: 0.58fr 1fr;
    padding: 36px 4% 0;
    border-radius: 22px;
  }

  .device {
    border-width: 5px;
  }

  .device.phone {
    border-radius: 20px 20px 0 0;
  }

  .device.tablet {
    border-radius: 15px 15px 0 0;
  }

  .page-hero {
    padding: 76px 0 46px;
  }

  .page-hero h1 {
    font-size: clamp(3rem, 15vw, 5rem);
  }

  .content-layout {
    padding: 52px 0 82px;
  }

  .reading-column h2 {
    margin-top: 42px;
  }

  .spec-list {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .spec-list dd {
    margin-bottom: 10px;
  }

  .footer-wrap {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  :root {
    color-scheme: light;
  }

  body {
    color: #111;
    background: #fff;
  }

  body::before,
  .site-header,
  .site-footer,
  .side-nav,
  .page-meta {
    display: none !important;
  }

  .page-hero,
  .content-layout {
    padding: 28px 0;
  }

  .page-hero p,
  .reading-column p,
  .reading-column li {
    color: #222;
  }

  .callout {
    color: #111;
    background: #f1f7f8;
    border-color: #b8d9df;
  }
}