:root {
  color-scheme: dark;
  --bg: #071317;
  --bg-deep: #03090c;
  --panel: rgba(13, 30, 36, 0.76);
  --panel-strong: rgba(16, 42, 50, 0.9);
  --text: #edf8f8;
  --muted: #9eb6b8;
  --soft: #d6ebeb;
  --accent: #39d7c9;
  --accent-strong: #53f1de;
  --accent-dark: #0c615a;
  --line: rgba(126, 242, 230, 0.16);
  --shadow: rgba(0, 0, 0, 0.38);
  --radius: 24px;
  --radius-small: 16px;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Noto Sans SC",
    "Microsoft YaHei",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 80% 10%, rgba(57, 215, 201, 0.2), transparent 28rem),
    radial-gradient(circle at 18% 24%, rgba(46, 119, 255, 0.14), transparent 26rem),
    linear-gradient(135deg, var(--bg-deep), var(--bg) 48%, #081c1f);
  overflow-x: hidden;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  content: "";
  background-image:
    linear-gradient(rgba(101, 237, 224, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(101, 237, 224, 0.055) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

body::after {
  position: fixed;
  inset: auto -10% 0 -10%;
  z-index: -1;
  height: 38vh;
  content: "";
  background: linear-gradient(90deg, transparent, rgba(57, 215, 201, 0.15), transparent);
  filter: blur(54px);
  animation: lightSweep 12s ease-in-out infinite alternate;
}

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

button,
select {
  font: inherit;
}

.page-shell {
  position: relative;
  isolation: isolate;
}

.section-wrap {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(190px, 1fr) auto minmax(230px, 1fr);
  align-items: center;
  gap: 18px;
  width: min(1160px, calc(100% - 32px));
  min-height: 74px;
  margin: 14px auto 0;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(4, 15, 19, 0.72);
  backdrop-filter: blur(22px);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.22);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 14px;
  color: #051012;
  background: linear-gradient(135deg, var(--accent-strong), #8affea);
  font-weight: 900;
  letter-spacing: -0.05em;
  box-shadow: 0 10px 32px rgba(57, 215, 201, 0.34);
}

.brand strong,
.site-footer strong {
  display: block;
  font-size: 0.98rem;
  line-height: 1.1;
}

.brand small,
.site-footer p {
  display: block;
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

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

.site-nav a,
.nav-privacy-link,
.footer-links a,
.footer-links button {
  border: 0;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  transition:
    color 180ms ease,
    background-color 180ms ease,
    transform 180ms ease;
}

.site-nav a {
  padding: 10px 13px;
  border-radius: 999px;
  white-space: nowrap;
}

.site-nav a:hover,
.nav-privacy-link:hover,
.footer-links a:hover,
.footer-links button:hover {
  color: var(--text);
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.06);
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.language-select {
  min-width: 116px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  background: rgba(6, 20, 24, 0.9);
  outline: none;
}

.nav-privacy-link {
  padding: 10px 14px;
  border: 1px solid rgba(57, 215, 201, 0.28);
  border-radius: 999px;
  color: var(--accent-strong);
  white-space: nowrap;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(300px, 0.98fr);
  align-items: center;
  gap: 56px;
  min-height: calc(100dvh - 88px);
  padding: 74px 0 76px;
}

.hero-copy h1,
.section-heading h2,
.privacy-copy h2,
.audience-block h2,
.faq h2 {
  margin: 0;
  color: var(--text);
  font-weight: 850;
  letter-spacing: -0.055em;
}

.hero-copy h1 {
  max-width: 760px;
  font-size: clamp(2.9rem, 7.2vw, 6.9rem);
  line-height: 0.92;
}

.kicker {
  margin: 0 0 16px;
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-subtitle {
  max-width: 620px;
  margin: 24px 0 0;
  color: var(--soft);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0 22px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 800;
  white-space: nowrap;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    border-color 160ms ease;
}

.primary-button {
  color: #031213;
  background: linear-gradient(135deg, var(--accent-strong), #a5fff0);
  box-shadow: 0 18px 42px rgba(57, 215, 201, 0.32);
}

.secondary-button {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-2px);
}

.primary-button:active,
.secondary-button:active {
  transform: translateY(1px) scale(0.99);
}

.hero-visual {
  min-width: 0;
}

.signal-board {
  position: relative;
  min-height: 590px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: calc(var(--radius) + 12px);
  background:
    linear-gradient(140deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.025)),
    rgba(8, 25, 30, 0.66);
  overflow: hidden;
  box-shadow: 0 40px 90px var(--shadow);
}

.signal-board::before {
  position: absolute;
  inset: 16px;
  content: "";
  border: 1px solid rgba(57, 215, 201, 0.13);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, transparent, rgba(57, 215, 201, 0.06), transparent),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.025) 0 1px, transparent 1px 12px);
}

.board-topline {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--soft);
  font-weight: 800;
}

.live-chip {
  padding: 7px 10px;
  border-radius: 999px;
  color: var(--accent-strong);
  background: rgba(57, 215, 201, 0.12);
  font-size: 0.78rem;
}

.phone-frame {
  position: relative;
  z-index: 1;
  width: min(330px, 74%);
  margin: 52px auto 0;
  padding: 12px;
  border-radius: 42px;
  background: linear-gradient(160deg, #10282d, #03090c);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.1),
    0 28px 80px rgba(0, 0, 0, 0.45);
  animation: floatPhone 5.8s ease-in-out infinite;
}

.phone-screen {
  min-height: 420px;
  padding: 22px 18px;
  border-radius: 32px;
  background:
    radial-gradient(circle at 70% 4%, rgba(57, 215, 201, 0.18), transparent 12rem),
    linear-gradient(180deg, #102d33, #081418);
}

.search-pill {
  margin-bottom: 22px;
  padding: 14px 15px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(0, 0, 0, 0.18);
  font-size: 0.9rem;
}

.item-row {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: center;
  margin-top: 12px;
  padding: 13px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
}

.item-row.active {
  border-color: rgba(57, 215, 201, 0.34);
  background: rgba(57, 215, 201, 0.1);
}

.item-glyph {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 16px;
  color: #071317;
  background: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 900;
}

.item-row strong,
.item-row small {
  display: block;
}

.item-row small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.8rem;
}

.orbit-card {
  position: absolute;
  z-index: 2;
  width: 178px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  background: rgba(6, 20, 24, 0.82);
  backdrop-filter: blur(18px);
  box-shadow: 0 22px 48px rgba(0, 0, 0, 0.28);
}

.orbit-card strong,
.orbit-card span {
  display: block;
}

.orbit-card span {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.84rem;
}

.card-a {
  top: 130px;
  right: 18px;
}

.card-b {
  left: 16px;
  bottom: 88px;
}

.features,
.privacy,
.faq {
  padding: 74px 0;
}

.section-heading {
  max-width: 760px;
}

.section-heading h2,
.privacy-copy h2,
.audience-block h2,
.faq h2 {
  font-size: clamp(2.1rem, 4.5vw, 4rem);
  line-height: 1.02;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-auto-flow: dense;
  gap: 16px;
  margin-top: 34px;
}

.feature-card {
  min-height: 230px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.045);
  box-shadow: 0 22px 54px rgba(0, 0, 0, 0.16);
}

.feature-card.tall {
  grid-row: span 2;
}

.feature-card.accent-card {
  background:
    linear-gradient(145deg, rgba(57, 215, 201, 0.18), rgba(255, 255, 255, 0.04)),
    rgba(255, 255, 255, 0.05);
}

.feature-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 30px;
  border-radius: 999px;
  color: var(--accent-strong);
  background: rgba(57, 215, 201, 0.1);
  font-size: 0.76rem;
  font-weight: 900;
}

.feature-card h3 {
  margin: 42px 0 12px;
  font-size: clamp(1.25rem, 2vw, 1.62rem);
  letter-spacing: -0.02em;
}

.feature-card p,
.privacy-panel p,
.faq-item p {
  color: var(--muted);
  line-height: 1.72;
}

.privacy-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 18px;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: calc(var(--radius) + 10px);
  background:
    linear-gradient(135deg, rgba(57, 215, 201, 0.1), transparent),
    rgba(255, 255, 255, 0.045);
}

.privacy-copy,
.privacy-commitment {
  padding: clamp(24px, 4vw, 42px);
  border-radius: var(--radius);
}

.privacy-commitment {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: rgba(3, 14, 17, 0.55);
}

.privacy-commitment h3 {
  margin: 0 0 14px;
  font-size: 1.5rem;
}

.inline-link {
  align-self: flex-start;
  margin-top: 18px;
  color: var(--accent-strong);
  font-weight: 800;
}

.audience-block {
  margin-top: 18px;
  padding: clamp(24px, 5vw, 44px);
  border-radius: calc(var(--radius) + 10px);
  background: rgba(255, 255, 255, 0.04);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.audience-grid span {
  min-height: 112px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  color: var(--soft);
  background: rgba(255, 255, 255, 0.04);
  line-height: 1.55;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 32px;
}

.faq-item {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
  overflow: hidden;
}

.faq-item summary {
  cursor: pointer;
  padding: 21px 22px;
  color: var(--text);
  font-weight: 850;
  list-style: none;
}

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

.faq-item summary::after {
  float: right;
  color: var(--accent-strong);
  content: "+";
}

.faq-item[open] summary::after {
  content: "-";
}

.faq-item p {
  margin: 0;
  padding: 0 22px 22px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 0 46px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

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

.footer-links button {
  padding: 0;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  z-index: 40;
  min-width: 150px;
  max-width: calc(100% - 32px);
  padding: 13px 18px;
  border: 1px solid rgba(57, 215, 201, 0.28);
  border-radius: 999px;
  color: var(--text);
  background: rgba(3, 14, 17, 0.92);
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.34);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 14px);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

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

@keyframes floatPhone {
  0%,
  100% {
    transform: translateY(0) rotate(-1deg);
  }

  50% {
    transform: translateY(-13px) rotate(1deg);
  }
}

@keyframes lightSweep {
  from {
    transform: translateX(-8%);
  }

  to {
    transform: translateX(8%);
  }
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr;
    border-radius: 28px;
  }

  .site-nav,
  .header-actions {
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 34px;
    min-height: auto;
    padding-top: 54px;
  }

  .signal-board {
    min-height: 520px;
  }

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

  .privacy-panel,
  .audience-grid {
    grid-template-columns: 1fr;
  }

  .audience-grid span {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  .section-wrap {
    width: min(100% - 28px, 1160px);
  }

  .site-header {
    width: min(100% - 20px, 1160px);
    margin-top: 10px;
    padding: 12px;
  }

  .site-nav {
    display: none;
  }

  .header-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }

  .language-select,
  .nav-privacy-link {
    width: 100%;
    text-align: center;
  }

  .hero {
    padding: 42px 0 50px;
  }

  .hero-copy h1 {
    font-size: clamp(2.55rem, 15vw, 4.1rem);
  }

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

  .primary-button,
  .secondary-button {
    width: 100%;
  }

  .signal-board {
    min-height: 470px;
    padding: 16px;
  }

  .phone-frame {
    width: 86%;
    margin-top: 36px;
  }

  .phone-screen {
    min-height: 360px;
    padding: 18px 13px;
  }

  .orbit-card {
    position: relative;
    width: 100%;
    inset: auto;
    margin-top: 12px;
  }

  .card-a,
  .card-b {
    left: auto;
    right: auto;
    top: auto;
    bottom: auto;
  }

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

  .feature-card.tall {
    grid-row: auto;
  }

  .features,
  .privacy,
  .faq {
    padding: 50px 0;
  }

  .privacy-panel {
    padding: 12px;
  }

  .privacy-copy,
  .privacy-commitment,
  .audience-block {
    padding: 22px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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