:root {
  --blue-950: #071a3d;
  --blue-900: #0a2559;
  --blue-700: #125fe8;
  --blue-600: #1d73f3;
  --cyan-400: #38d7ff;
  --mint-400: #5ce9bf;
  --white: #ffffff;
  --ink: #0b1731;
  --muted: #61708e;
  --line: rgba(36, 78, 142, 0.14);
  --surface: #f4f8ff;
  --surface-strong: #eaf2ff;
  --shadow: 0 28px 80px rgba(15, 55, 122, 0.16);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --container: min(1180px, calc(100vw - 40px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  max-width: 100%;
  overflow-x: clip;
}

body {
  margin: 0;
  max-width: 100%;
  overflow-x: clip;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 2%, rgba(56, 215, 255, 0.18), transparent 30%),
    radial-gradient(circle at 96% 18%, rgba(18, 95, 232, 0.12), transparent 28%),
    #f8fbff;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

button {
  font: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(56, 215, 255, 0.78);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  left: 18px;
  top: -64px;
  z-index: 1000;
  padding: 12px 18px;
  border-radius: 12px;
  background: var(--white);
  color: var(--blue-700);
  font-weight: 800;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 18px;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(7, 26, 61, 0.72);
  backdrop-filter: blur(20px) saturate(140%);
  color: var(--white);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.site-header.scrolled {
  background: rgba(7, 26, 61, 0.94);
  box-shadow: 0 12px 34px rgba(0, 12, 38, 0.2);
}

.nav-shell {
  width: var(--container);
  min-width: 0;
  min-height: 78px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.01em;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  box-shadow: 0 10px 24px rgba(20, 142, 255, 0.36);
}

.brand small {
  display: block;
  margin-top: 1px;
  color: rgba(255, 255, 255, 0.62);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex: 1 1 auto;
}

.nav-links a {
  position: relative;
  color: rgba(255, 255, 255, 0.78);
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -8px;
  height: 2px;
  border-radius: 999px;
  background: var(--cyan-400);
  transition: right 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--white);
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  right: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.language-switcher {
  display: flex;
  align-items: center;
  padding: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
}

.language-switcher button {
  min-width: 38px;
  min-height: 32px;
  padding: 6px 10px;
  border: 0;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.64);
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
}

.language-switcher button[aria-pressed="true"] {
  color: var(--blue-900);
  background: var(--white);
  box-shadow: 0 5px 16px rgba(0, 0, 0, 0.16);
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 14px;
  cursor: pointer;
  font-weight: 850;
  line-height: 1.15;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--blue-600), #0b52d5);
  box-shadow: 0 14px 32px rgba(18, 95, 232, 0.3);
}

.button-primary:hover,
.button-primary:focus-visible {
  box-shadow: 0 18px 38px rgba(18, 95, 232, 0.4);
}

.button-light {
  color: var(--blue-900);
  background: var(--white);
  box-shadow: 0 14px 28px rgba(7, 26, 61, 0.12);
}

.button-ghost {
  border-color: rgba(16, 66, 138, 0.18);
  color: var(--blue-900);
  background: rgba(255, 255, 255, 0.7);
}

.button-header {
  min-height: 42px;
  padding: 0 16px;
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--white);
  background: rgba(255, 255, 255, 0.1);
  font-size: 14px;
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 13px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
}

.menu-button span,
.menu-button::before,
.menu-button::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  border-radius: 999px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-open .menu-button span {
  opacity: 0;
}

.menu-open .menu-button::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-open .menu-button::after {
  transform: translateY(-6px) rotate(-45deg);
}

.hero {
  position: relative;
  min-height: 760px;
  overflow: hidden;
  padding: 144px 0 112px;
  color: var(--white);
  background:
    radial-gradient(circle at 78% 28%, rgba(56, 215, 255, 0.28), transparent 25%),
    radial-gradient(circle at 18% 78%, rgba(92, 233, 191, 0.16), transparent 24%),
    linear-gradient(135deg, #061a3f 0%, #0a2f72 54%, #096bb0 100%);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(117, 220, 255, 0.14);
  border-radius: 50%;
  pointer-events: none;
}

.hero::before {
  width: 640px;
  height: 640px;
  left: -300px;
  top: 110px;
}

.hero::after {
  width: 760px;
  height: 760px;
  right: -390px;
  top: 60px;
}

.hero-grid {
  position: relative;
  z-index: 2;
  width: var(--container);
  min-height: 520px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 760px) minmax(260px, 1fr);
  align-items: center;
  gap: 48px;
}

.hero-backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero-backdrop video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
}

.hero-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(4, 18, 48, 0.78) 0%, rgba(5, 27, 65, 0.66) 48%, rgba(5, 36, 78, 0.34) 100%),
    linear-gradient(180deg, rgba(3, 17, 43, 0.18), rgba(3, 18, 45, 0.54));
}

.hero-copy-block {
  position: relative;
  z-index: 2;
  min-width: 0;
  text-shadow: 0 3px 22px rgba(0, 10, 35, 0.36);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid rgba(124, 228, 255, 0.34);
  border-radius: 999px;
  color: #d8f7ff;
  background: rgba(255, 255, 255, 0.08);
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  max-width: 100%;
  line-height: 1.45;
  white-space: normal;
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mint-400);
  box-shadow: 0 0 18px rgba(92, 233, 191, 0.9);
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  50% { transform: scale(1.4); opacity: 0.68; }
}

.hero h1 {
  max-width: 700px;
  margin: 24px 0 22px;
  font-size: clamp(46px, 6vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.hero h1 .accent {
  display: block;
  color: transparent;
  background: linear-gradient(90deg, #ffffff 3%, #8be8ff 48%, #7cf2c9 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero h1 > span:first-child {
  display: block;
}

html[lang="zh-CN"] .hero h1 {
  font-size: clamp(48px, 5vw, 66px);
  letter-spacing: -0.025em;
}

.hero-copy {
  max-width: 650px;
  margin: 0;
  color: rgba(236, 246, 255, 0.8);
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
  margin-top: 32px;
}

.hero-actions .button {
  min-height: 54px;
  padding: 0 24px;
}

.audience-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.audience-actions a {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 14px;
  color: rgba(255, 255, 255, 0.94);
  background: rgba(7, 34, 78, 0.42);
  backdrop-filter: blur(10px);
  font-size: 14px;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.audience-actions a:hover,
.audience-actions a:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(124, 242, 201, 0.64);
  background: rgba(10, 63, 128, 0.72);
}

.audience-actions a span {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--blue-950);
  background: rgba(255, 255, 255, 0.9);
  font-size: 16px;
  font-weight: 900;
}

.language-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  color: rgba(255, 255, 255, 0.64);
  font-size: 14px;
  font-weight: 700;
}

.language-pill {
  padding: 7px 11px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
}

.hero-sidecards {
  position: relative;
  min-width: 0;
  min-height: 320px;
}

.video-label {
  position: absolute;
  right: 0;
  top: 14px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 14px;
  background: rgba(5, 29, 70, 0.62);
  backdrop-filter: blur(12px);
  font-size: 16px;
  font-weight: 800;
  box-shadow: 0 14px 34px rgba(0, 12, 40, 0.22);
}

.live-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #66f0b9;
  box-shadow: 0 0 16px rgba(102, 240, 185, 0.86);
}

.floating-card {
  position: absolute;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 184px;
  padding: 13px 15px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 16px;
  color: var(--blue-950);
  background: rgba(255, 255, 255, 0.93);
  box-shadow: 0 16px 44px rgba(0, 16, 50, 0.24);
  backdrop-filter: blur(14px);
  font-size: 13px;
  font-weight: 800;
}

.floating-card strong {
  display: block;
  font-size: 14px;
}

.floating-card small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.floating-card.chat {
  right: 0;
  top: 92px;
  animation: floatCard 5s ease-in-out infinite;
}

.floating-card.match {
  right: 0;
  bottom: 20px;
  animation: floatCard 5.8s ease-in-out -1.2s infinite;
}

.floating-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 13px;
  color: var(--white);
  background: linear-gradient(145deg, #257fff, #17c7df);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45), 0 8px 18px rgba(19, 112, 224, 0.3);
  font-size: 17px;
}

@keyframes floatCard {
  50% { transform: translateY(-10px); }
}

.trust-strip {
  position: relative;
  z-index: 3;
  width: var(--container);
  margin: -38px auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  border: 1px solid rgba(26, 86, 163, 0.13);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.trust-item {
  min-height: 132px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 24px;
  border-right: 1px solid var(--line);
}

.trust-item:last-child {
  border-right: 0;
}

.trust-item .icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid rgba(86, 179, 255, 0.26);
  border-radius: 15px;
  color: #ffffff;
  background: linear-gradient(145deg, #1977f2, #23c7df);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45), 0 10px 24px rgba(21, 112, 221, 0.22);
  font-size: 20px;
  font-weight: 900;
}

.trust-item:nth-child(2) .icon {
  background: linear-gradient(145deg, #6647ec, #2db4f3);
}

.trust-item:nth-child(3) .icon {
  background: linear-gradient(145deg, #0f8c79, #55d8a9);
}

.trust-item:nth-child(4) .icon {
  background: linear-gradient(145deg, #ef7b29, #ffb84d);
}

.trust-item strong {
  display: block;
  font-size: 17px;
}

.trust-item span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.section {
  padding: 116px 0;
}

.section-shell {
  width: var(--container);
  min-width: 0;
  margin: 0 auto;
}

.section-head {
  max-width: 750px;
  margin-bottom: 52px;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  color: var(--blue-700);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-kicker::before {
  content: "";
  width: 24px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}

.section h2 {
  margin: 0;
  font-size: clamp(34px, 4.6vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.section-intro {
  max-width: 690px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.story-grid {
  display: grid;
  grid-template-columns: 1fr;
  align-items: stretch;
  gap: 28px;
}

.story-video {
  position: relative;
  min-height: 0;
  aspect-ratio: 16 / 7;
  overflow: hidden;
  border-radius: var(--radius-xl);
  background: var(--blue-950);
  box-shadow: var(--shadow);
}

.story-video video,
.story-video img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
}

.story-video::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 52%, rgba(3, 20, 50, 0.8));
}

.story-caption {
  position: absolute;
  inset: auto 28px 26px;
  z-index: 2;
  color: var(--white);
}

.story-caption strong {
  display: block;
  font-size: 25px;
}

.story-caption span {
  display: block;
  margin-top: 7px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 15px;
}

.story-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.story-point {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 12px 36px rgba(18, 57, 119, 0.07);
}

.story-point .number {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  border-radius: 12px;
  color: var(--white);
  background: var(--blue-700);
  font-size: 13px;
  font-weight: 900;
}

.story-point strong {
  display: block;
  font-size: 20px;
}

.story-point p {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.features-section {
  background: linear-gradient(180deg, #eef5ff 0%, #f8fbff 100%);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.mobile-scroll-hint,
.screen-hint {
  margin: -22px 0 22px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 750;
}

.mobile-scroll-hint {
  display: none;
}

.feature-card {
  position: relative;
  min-height: 292px;
  display: block;
  overflow: hidden;
  padding: 28px;
  border: 1px solid rgba(21, 81, 163, 0.12);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 14px 42px rgba(17, 57, 119, 0.07);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.feature-card::after {
  content: "";
  position: absolute;
  width: 130px;
  height: 130px;
  right: -58px;
  bottom: -70px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 215, 255, 0.2), transparent 68%);
}

.feature-card:hover {
  transform: translateY(-7px);
  border-color: rgba(29, 115, 243, 0.26);
  box-shadow: 0 22px 52px rgba(17, 57, 119, 0.13);
}

.feature-card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(29, 115, 243, 0.5);
  box-shadow: 0 22px 52px rgba(17, 57, 119, 0.13);
}

.feature-icon {
  position: relative;
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  margin-bottom: 26px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 19px;
  color: #ffffff;
  background: linear-gradient(145deg, #176ef0, #2fc8e1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.44), 0 12px 26px rgba(22, 105, 215, 0.22);
  font-size: 15px;
  font-weight: 950;
  letter-spacing: -0.03em;
}

.feature-icon::after {
  content: "";
  position: absolute;
  width: 38px;
  height: 76px;
  left: -18px;
  top: -28px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent);
  transform: rotate(28deg);
}

.feature-card:nth-child(2) .feature-icon {
  background: linear-gradient(145deg, #0f937d, #5bd7a9);
}

.feature-card:nth-child(3) .feature-icon {
  background: linear-gradient(145deg, #7050eb, #3297f4);
}

.feature-card:nth-child(4) .feature-icon {
  background: linear-gradient(145deg, #2085f5, #20c7c3);
  font-size: 23px;
}

.feature-card:nth-child(5) .feature-icon {
  background: linear-gradient(145deg, #ef7d26, #ffbd4d);
  font-size: 12px;
}

.feature-card:nth-child(6) .feature-icon {
  background: linear-gradient(145deg, #df4f74, #8e5aeb);
  font-size: 24px;
}

.feature-card h3 {
  margin: 0;
  font-size: 23px;
}

.feature-card p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.72;
}

.feature-meta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 20px;
  color: var(--blue-700);
  font-size: 14px;
  font-weight: 850;
}

.screens-section {
  overflow: hidden;
  background: #071a3d;
  color: var(--white);
}

.screens-section .section-kicker {
  color: var(--cyan-400);
}

.screens-section .section-intro {
  color: rgba(255, 255, 255, 0.64);
}

.screen-track {
  display: grid;
  grid-template-columns: repeat(4, minmax(220px, 1fr));
  gap: 22px;
  align-items: start;
  width: 100%;
  max-width: 100%;
  min-width: 0;
}

.screen-card {
  position: relative;
  width: 100%;
  min-width: 0;
  padding: 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 30px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.25);
  cursor: zoom-in;
  text-align: left;
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.screen-card:hover,
.screen-card:focus-visible {
  transform: translateY(-5px);
  border-color: rgba(92, 233, 191, 0.55);
  background: rgba(255, 255, 255, 0.13);
}

.screen-card:nth-child(even) {
  margin-top: 0;
}

.screen-card img {
  width: 100%;
  border-radius: 23px;
}

.screen-card span {
  position: absolute;
  left: 22px;
  bottom: 20px;
  padding: 8px 11px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 12px;
  background: rgba(6, 24, 57, 0.75);
  backdrop-filter: blur(10px);
  font-size: 14px;
  font-weight: 800;
}

.screen-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 28px;
}

.screen-arrow {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  color: var(--white);
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  font-size: 20px;
  transition: background 0.2s ease, transform 0.2s ease;
}

.screen-arrow:hover,
.screen-arrow:focus-visible {
  transform: translateY(-2px);
  background: rgba(56, 215, 255, 0.22);
}

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

.screen-dots span {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.34);
  transition: width 0.2s ease, background 0.2s ease;
}

.screen-dots span.active {
  width: 26px;
  background: var(--mint-400);
}

.screen-lightbox {
  width: min(92vw, 520px);
  max-height: 92vh;
  padding: 0;
  border: 0;
  border-radius: 28px;
  color: var(--white);
  background: transparent;
  overflow: visible;
}

.screen-lightbox::backdrop {
  background: rgba(2, 10, 28, 0.82);
  backdrop-filter: blur(9px);
}

.screen-dialog-card {
  position: relative;
  padding: 12px 12px 18px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 28px;
  background: #081d43;
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.5);
}

.screen-dialog-card img {
  width: 100%;
  max-height: calc(92vh - 76px);
  object-fit: contain;
  border-radius: 20px;
}

.screen-dialog-card strong {
  display: block;
  padding: 14px 50px 0 6px;
  font-size: 16px;
}

.screen-dialog-close {
  position: absolute;
  right: 20px;
  bottom: 12px;
  z-index: 2;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  color: var(--white);
  background: rgba(255, 255, 255, 0.12);
  cursor: pointer;
  font-size: 24px;
}

.ai-grid {
  display: grid;
  grid-template-columns: 0.86fr 1.14fr;
  align-items: center;
  gap: 72px;
}

.ai-visual {
  position: relative;
  min-height: 560px;
  display: grid;
  place-items: end center;
  overflow: hidden;
  border-radius: 42px;
  background:
    radial-gradient(circle at 60% 24%, rgba(95, 231, 255, 0.72), transparent 25%),
    linear-gradient(145deg, #0c2d72 0%, #1279ef 62%, #55e9c2 140%);
  box-shadow: var(--shadow);
}

.ai-visual::before {
  content: "AI";
  position: absolute;
  inset: 22px auto auto 28px;
  color: rgba(255, 255, 255, 0.14);
  font-size: 106px;
  font-weight: 950;
  letter-spacing: -0.08em;
}

.ai-visual img {
  position: relative;
  z-index: 2;
  width: 88%;
  filter: drop-shadow(0 26px 32px rgba(2, 19, 55, 0.34));
}

.ai-status {
  position: absolute;
  right: 20px;
  top: 20px;
  z-index: 3;
  padding: 9px 12px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  color: var(--white);
  background: rgba(7, 26, 61, 0.34);
  backdrop-filter: blur(12px);
  font-size: 13px;
  font-weight: 900;
}

.ai-list {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.ai-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 17px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.75);
}

.ai-item .check {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: var(--white);
  background: var(--blue-700);
  font-size: 13px;
  font-weight: 900;
}

.ai-item strong {
  display: block;
  font-size: 17px;
}

.ai-item span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.language-stage {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 32px;
  align-items: stretch;
}

.language-copy,
.translation-demo {
  padding: 38px;
  border-radius: var(--radius-xl);
}

.language-copy {
  color: var(--white);
  background:
    radial-gradient(circle at 90% 10%, rgba(56, 215, 255, 0.26), transparent 32%),
    #0a2a68;
}

.language-copy h2 {
  font-size: clamp(32px, 4vw, 50px);
}

.language-copy p {
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  font-size: 17px;
}

.language-codes {
  display: flex;
  gap: 10px;
  margin-top: 36px;
}

.language-codes span {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.08);
  font-weight: 900;
}

.translation-demo {
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: var(--shadow);
}

.demo-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.demo-top strong {
  font-size: 18px;
}

.demo-badge {
  padding: 7px 10px;
  border-radius: 999px;
  color: #0f7959;
  background: #e6fbf4;
  font-size: 13px;
  font-weight: 900;
}

.message {
  width: fit-content;
  max-width: 86%;
  margin-top: 22px;
  padding: 14px 16px;
  border-radius: 16px 16px 16px 5px;
  background: #edf3fb;
  font-size: 14px;
  line-height: 1.6;
}

.message.user {
  margin-left: auto;
  border-radius: 16px 16px 5px 16px;
  color: var(--white);
  background: var(--blue-700);
}

.translation-result {
  margin-top: 8px;
  padding: 14px 16px;
  border: 1px solid #bee8ff;
  border-radius: 14px;
  color: #0a4f7a;
  background: #effaff;
  font-size: 13px;
  line-height: 1.6;
}

.translation-result strong {
  display: block;
  margin-bottom: 4px;
  color: var(--blue-700);
  font-size: 11px;
  text-transform: uppercase;
}

.safety-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.safety-step {
  position: relative;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.82);
}

.safety-step:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -20px;
  top: 50%;
  z-index: 2;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--blue-700);
  background: var(--white);
  font-weight: 900;
}

.safety-step span {
  color: var(--blue-700);
  font-size: 12px;
  font-weight: 900;
}

.safety-step h3 {
  margin: 16px 0 10px;
  font-size: 20px;
}

.safety-step p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.download-panel {
  position: relative;
  overflow: hidden;
  padding: 58px;
  border-radius: 38px;
  color: var(--white);
  background:
    radial-gradient(circle at 84% 28%, rgba(56, 215, 255, 0.32), transparent 28%),
    linear-gradient(135deg, #071a3d 0%, #0b3884 65%, #087bc2 100%);
  box-shadow: 0 34px 90px rgba(11, 57, 130, 0.26);
}

.download-panel::after {
  content: "360";
  position: absolute;
  right: -10px;
  bottom: -68px;
  color: rgba(255, 255, 255, 0.06);
  font-size: 220px;
  font-weight: 950;
  letter-spacing: -0.1em;
}

.download-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.download-content h2 {
  font-size: clamp(34px, 5vw, 60px);
}

.download-content p {
  max-width: 650px;
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 16px;
  line-height: 1.75;
}

.store-row,
.site-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.store-button {
  min-width: 188px;
  min-height: 58px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
}

.store-button .store-icon {
  font-size: 25px;
}

.store-button small,
.store-button strong {
  display: block;
}

.store-button small {
  color: rgba(255, 255, 255, 0.62);
  font-size: 12px;
}

.store-button strong {
  margin-top: 2px;
  font-size: 14px;
}

.site-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
  font-weight: 800;
}

.download-qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(150px, 178px));
  gap: 14px;
  margin-top: 24px;
}

.download-qr-grid figure {
  margin: 0;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.1);
}

.download-qr-grid img {
  width: 100%;
  aspect-ratio: 1;
  padding: 7px;
  border-radius: 10px;
  background: var(--white);
}

.download-qr-grid figcaption {
  margin-top: 9px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 12px;
  line-height: 1.45;
}

.mobile-download-bar {
  display: none;
}

.site-footer {
  padding: 64px 0 34px;
  background: #051329;
  color: rgba(255, 255, 255, 0.64);
}

.footer-grid {
  width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.35fr repeat(3, 0.7fr);
  gap: 46px;
}

.footer-brand .brand {
  color: var(--white);
}

.footer-brand p {
  max-width: 350px;
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.75;
}

.footer-column strong {
  display: block;
  margin-bottom: 16px;
  color: var(--white);
  font-size: 15px;
}

.footer-column a {
  display: block;
  width: fit-content;
  margin-top: 11px;
  font-size: 15px;
  transition: color 0.2s ease;
}

.footer-column a:hover,
.footer-column a:focus-visible {
  color: var(--white);
}

.footer-bottom {
  width: var(--container);
  margin: 46px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 14px;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1060px) {
  .nav-links {
    gap: 16px;
  }

  .nav-links a {
    font-size: 13px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(250px, 0.55fr);
    gap: 34px;
  }

  .floating-card {
    right: 0 !important;
  }

  .trust-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .trust-item:nth-child(2) {
    border-right: 0;
  }

  .trust-item:nth-child(-n+2) {
    border-bottom: 1px solid var(--line);
  }

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

  .screen-track {
    grid-template-columns: repeat(4, 260px);
    overflow-x: auto;
    padding-bottom: 18px;
    scrollbar-width: thin;
    overscroll-behavior-inline: contain;
    scroll-snap-type: x proximity;
  }

  .screen-card {
    scroll-snap-align: start;
  }
}

@media (max-width: 860px) {
  :root {
    --container: min(100% - 30px, 720px);
  }

  .site-header {
    background: rgba(7, 26, 61, 0.94);
  }

  .nav-shell {
    min-height: 70px;
  }

  .nav-links {
    position: fixed;
    inset: 70px 0 auto;
    display: grid;
    justify-items: stretch;
    gap: 0;
    padding: 14px 20px 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(7, 26, 61, 0.98);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.24);
    transform: translateY(-130%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .menu-open .nav-links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    padding: 15px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 15px;
  }

  .nav-links a::after {
    display: none;
  }

  .button-header {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .hero {
    min-height: 0;
    padding: 126px 0 98px;
  }

  .hero-grid,
  .story-grid,
  .ai-grid,
  .language-stage {
    grid-template-columns: 1fr;
  }

  .hero-copy-block {
    text-align: center;
  }

  .hero h1,
  .hero-copy {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions,
  .language-line {
    justify-content: center;
  }

  .hero-sidecards {
    min-height: 0;
    margin-top: 26px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .hero-sidecards .video-label {
    position: static;
    grid-column: 1 / -1;
    justify-self: center;
  }

  .hero-sidecards .floating-card {
    position: static;
    width: 100%;
    min-width: 0;
    max-width: none;
    animation: none;
  }

  .section {
    padding: 88px 0;
  }

  .story-video {
    min-height: 0;
  }

  .story-panel {
    grid-template-columns: 1fr;
  }

  .ai-grid {
    gap: 46px;
  }

  .ai-visual {
    min-height: 470px;
  }

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

@media (max-width: 620px) {
  :root {
    --container: calc(100% - 24px);
    --radius-xl: 26px;
  }

  .site-header {
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }

  .brand span {
    font-size: 17px;
  }

  .brand small {
    display: none;
  }

  .brand img {
    width: 38px;
    height: 38px;
    border-radius: 11px;
  }

  .nav-shell {
    gap: 12px;
  }

  .nav-actions {
    gap: 8px;
    margin-left: auto;
  }

  .language-switcher button {
    min-width: 32px;
    padding: 5px 7px;
    font-size: 11px;
  }

  .hero {
    padding: 96px 0 46px;
  }

  .hero h1 {
    margin-top: 18px;
    margin-bottom: 16px;
    font-size: clamp(34px, 10.2vw, 44px);
    line-height: 1.08;
  }

  html[lang="zh-CN"] .hero h1 {
    font-size: clamp(34px, 10vw, 43px);
  }

  html[lang="en-US"] .hero h1,
  html[lang="es"] .hero h1 {
    font-size: clamp(31px, 9.2vw, 40px);
    letter-spacing: -0.035em;
  }

  html[lang="en-US"] .eyebrow,
  html[lang="es"] .eyebrow {
    text-transform: none;
    letter-spacing: 0.025em;
  }

  .hero-copy {
    font-size: 16px;
    line-height: 1.62;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-actions .button-ghost,
  .language-line {
    display: none;
  }

  .audience-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .audience-actions a {
    min-width: 0;
    min-height: 74px;
    flex-direction: column;
    justify-content: center;
    padding: 8px 5px;
    text-align: center;
    font-size: 13px;
    line-height: 1.25;
  }

  .hero-grid {
    min-height: 0;
  }

  .hero-backdrop video {
    object-position: 58% center;
  }

  .hero-backdrop::after {
    background:
      linear-gradient(180deg, rgba(3, 17, 43, 0.56) 0%, rgba(4, 24, 58, 0.62) 50%, rgba(4, 22, 54, 0.74) 100%),
      linear-gradient(90deg, rgba(4, 18, 48, 0.48), rgba(5, 34, 72, 0.3));
  }

  .hero-sidecards {
    display: none;
  }

  .trust-strip {
    grid-template-columns: 1fr;
    margin-top: -44px;
  }

  .trust-item,
  .trust-item:nth-child(2) {
    min-height: 96px;
    padding: 18px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .trust-item:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 72px 0;
  }

  .section-head {
    margin-bottom: 34px;
  }

  .section h2 {
    font-size: 34px;
  }

  .section-intro {
    font-size: 16px;
  }

  .story-video {
    min-height: 0;
    aspect-ratio: 16 / 9;
  }

  .story-caption {
    inset: auto 18px 16px;
  }

  .story-caption strong {
    font-size: 21px;
  }

  .story-caption span {
    font-size: 15px;
  }

  .story-panel {
    grid-template-columns: 1fr;
  }

  .mobile-scroll-hint {
    display: block;
  }

  .feature-grid,
  .safety-grid {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: minmax(282px, 86vw);
    overflow-x: auto;
    margin-inline: -12px;
    padding: 0 12px 18px;
    scroll-padding-inline: 12px;
    scroll-snap-type: x mandatory;
    scrollbar-width: thin;
    overscroll-behavior-inline: contain;
  }

  .feature-card,
  .safety-step {
    min-height: 0;
    scroll-snap-align: start;
  }

  .safety-step:not(:last-child)::after {
    display: none;
  }

  .screen-track {
    grid-template-columns: repeat(4, 210px);
    margin-right: 0;
    padding-right: 12px;
  }

  .screen-card:nth-child(even) { margin-top: 0; }

  .ai-visual {
    min-height: 390px;
  }

  .language-copy,
  .translation-demo,
  .download-panel {
    padding: 28px 22px;
  }

  .download-panel::after {
    font-size: 140px;
  }

  .store-button {
    width: 100%;
  }

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

  .mobile-download-bar {
    position: fixed;
    left: max(10px, env(safe-area-inset-left));
    right: max(10px, env(safe-area-inset-right));
    bottom: max(10px, env(safe-area-inset-bottom));
    z-index: 90;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 9px 10px 9px 15px;
    border: 1px solid rgba(255, 255, 255, 0.72);
    border-radius: 20px;
    color: var(--white);
    background: rgba(6, 30, 72, 0.94);
    box-shadow: 0 18px 50px rgba(3, 20, 51, 0.32);
    backdrop-filter: blur(18px);
    opacity: 0;
    pointer-events: none;
    transform: translateY(calc(100% + 26px));
    transition: opacity 0.22s ease, transform 0.22s ease;
  }

  .mobile-download-visible .mobile-download-bar {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .mobile-download-bar span,
  .mobile-download-bar small {
    display: block;
  }

  .mobile-download-bar strong {
    font-size: 16px;
  }

  .mobile-download-bar small {
    max-width: 180px;
    margin-top: 2px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 11px;
    line-height: 1.3;
  }

  .mobile-download-bar .button {
    min-height: 48px;
    flex: 0 0 auto;
    padding-inline: 15px;
    font-size: 13px;
  }

  .site-footer {
    padding-bottom: 118px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-bottom {
    flex-direction: column;
    font-size: 13px;
  }
}

@media (max-width: 360px) {
  .brand span {
    display: none;
  }

  .language-switcher button {
    min-width: 30px;
    padding-inline: 6px;
  }

  .hero-sidecards {
    grid-template-columns: 1fr;
  }

  .hero-sidecards .video-label {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}