:root {
  --bg: #171717;
  --bg-deep: #111111;
  --surface: #202020;
  --surface-raised: #272727;
  --text: #f7f2ea;
  --muted: #b9b1a7;
  --soft: #8e877f;
  --line: rgba(247, 242, 234, 0.13);
  --accent: #f33c4f;
  --accent-dark: #c9293b;
  --warm: #e5b973;
  --content: 1120px;
  --radius-lg: 28px;
  --radius-md: 18px;
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 84% 8%, rgba(243, 60, 79, 0.08), transparent 27rem),
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: auto, 56px 56px, 56px 56px;
  content: "";
}

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

a {
  color: inherit;
}

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

:focus-visible {
  outline: 3px solid rgba(243, 60, 79, 0.72);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  color: var(--bg-deep);
  background: var(--text);
  border-radius: 8px;
  font-weight: 700;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: none;
}

.container {
  width: min(var(--content), calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(23, 23, 23, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.nav-shell {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #1d1d1d;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.28);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-name {
  display: grid;
  line-height: 1.2;
}

.brand-name strong {
  font-size: 16px;
  letter-spacing: 0.08em;
}

.brand-name small {
  color: var(--soft);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
}

.menu-button {
  width: 44px;
  height: 44px;
  display: none;
  padding: 0;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.menu-button span,
.menu-button::before,
.menu-button::after {
  width: 18px;
  height: 2px;
  display: block;
  margin: 4px auto;
  background: currentColor;
  border-radius: 2px;
  content: "";
}

.hero {
  min-height: calc(100vh - 74px);
  display: grid;
  align-items: center;
  padding: 80px 0 96px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  align-items: center;
  gap: clamp(52px, 8vw, 112px);
}

.eyebrow,
.section-kicker {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 720px;
  margin: 0 0 24px;
  font-size: clamp(48px, 6.2vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.065em;
}

.hero h1 span {
  display: block;
  color: var(--muted);
}

.hero h1 .hero-line-primary {
  color: var(--text);
  white-space: nowrap;
}

.hero-product {
  margin: 0 0 14px;
  color: var(--text);
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 750;
  letter-spacing: -0.02em;
}

.hero-description {
  max-width: 650px;
  margin: 0 0 34px;
  color: var(--muted);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
  transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

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

.button-primary {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.button-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.button-secondary {
  background: var(--surface);
}

.button-secondary:hover {
  background: var(--surface-raised);
  border-color: rgba(247, 242, 234, 0.24);
}

.signal-stage {
  position: relative;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 38px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.035), transparent 45%),
    var(--bg-deep);
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.36);
  overflow: hidden;
}

.signal-stage::before,
.signal-stage::after {
  position: absolute;
  border: 1px solid rgba(229, 185, 115, 0.23);
  border-radius: 50%;
  content: "";
}

.signal-stage::before {
  width: 73%;
  aspect-ratio: 1;
}

.signal-stage::after {
  width: 54%;
  aspect-ratio: 1;
  border-color: rgba(247, 242, 234, 0.08);
}

.app-icon-showcase {
  z-index: 1;
  width: 68%;
  border: 1px solid rgba(247, 242, 234, 0.16);
  border-radius: 25%;
  box-shadow:
    0 30px 70px rgba(0, 0, 0, 0.48),
    0 0 42px rgba(243, 60, 79, 0.09);
}

.signal {
  z-index: 1;
  height: 42%;
  display: flex;
  align-items: center;
  gap: clamp(7px, 1.4vw, 13px);
}

.signal span {
  width: clamp(8px, 1.3vw, 13px);
  height: var(--h);
  border-radius: 99px;
  background: var(--text);
  box-shadow: 0 5px 16px rgba(0, 0, 0, 0.35);
}

.signal span:nth-child(4) {
  background: var(--accent);
  box-shadow: 0 0 24px rgba(243, 60, 79, 0.34);
}

.signal-caption {
  position: absolute;
  bottom: 25px;
  z-index: 2;
  display: grid;
  gap: 2px;
  text-align: center;
}

.signal-caption strong {
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.signal-caption span {
  color: var(--soft);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section {
  padding: 104px 0;
}

.section-bordered {
  border-block: 1px solid var(--line);
  background: var(--bg-deep);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 44px;
}

.section-heading h2,
.privacy-copy h2,
.contact-copy h2 {
  margin: 0 0 16px;
  font-size: clamp(32px, 4.8vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.045em;
}

.section-heading > p:last-child,
.privacy-copy > p,
.contact-copy > p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  min-height: 250px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color 180ms ease, transform 180ms ease;
}

.feature-card:hover {
  border-color: rgba(243, 60, 79, 0.45);
  transform: translateY(-3px);
}

.feature-visual {
  min-height: 62px;
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 28px;
  color: var(--accent);
}

.feature-visual span {
  width: 6px;
  height: var(--h);
  border-radius: 6px;
  background: currentColor;
}

.feature-index {
  margin-left: auto;
  color: var(--soft);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.privacy-layout,
.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
  align-items: start;
  gap: clamp(48px, 8vw, 100px);
}

.privacy-list,
.steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.privacy-list li,
.step {
  position: relative;
  padding: 22px 22px 22px 54px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}

.privacy-list li::before {
  position: absolute;
  top: 25px;
  left: 23px;
  width: 13px;
  height: 13px;
  border: 3px solid var(--accent);
  border-radius: 50%;
  content: "";
}

.privacy-list strong,
.step strong {
  display: block;
  margin-bottom: 4px;
}

.privacy-list span,
.step p {
  color: var(--muted);
  font-size: 14px;
}

.steps {
  counter-reset: step;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.step {
  min-height: 220px;
  padding: 28px;
  counter-increment: step;
}

.step::before {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  margin-bottom: 46px;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 50%;
  content: counter(step, decimal-leading-zero);
  font-size: 11px;
  font-weight: 800;
}

.step p {
  margin: 0;
}

.contact-panel {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  padding: clamp(30px, 6vw, 64px);
  border: 1px solid rgba(247, 242, 234, 0.16);
  border-radius: var(--radius-lg);
  background: var(--surface-raised);
}

.contact-meta {
  display: grid;
  gap: 10px;
  min-width: 300px;
}

.contact-meta p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.contact-meta strong {
  color: var(--text);
}

.email-link {
  color: var(--text);
  text-underline-offset: 4px;
}

.site-footer {
  padding: 38px 0;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
}

.footer-brand {
  margin: 0 0 6px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.footer-meta,
.footer-links,
.icp-line {
  margin: 0;
  color: var(--soft);
  font-size: 12px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px 20px;
}

.footer-links a,
.icp-line a {
  text-underline-offset: 3px;
}

.icp-line {
  margin-top: 10px;
  text-align: right;
}

.verification-note {
  color: var(--warm);
}

/* Long-form legal and support pages */
.page-hero {
  padding: 76px 0 46px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-deep);
}

.breadcrumb {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  text-underline-offset: 4px;
}

.page-hero h1 {
  max-width: 820px;
  margin: 0 0 16px;
  font-size: clamp(38px, 6vw, 66px);
  line-height: 1.1;
  letter-spacing: -0.05em;
}

.page-lead {
  max-width: 740px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.updated {
  display: inline-block;
  margin-top: 22px;
  padding: 6px 10px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 99px;
  font-size: 12px;
}

.document-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.document-summary > div {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.document-summary span,
.document-summary strong {
  display: block;
}

.document-summary span {
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.document-summary strong {
  margin-bottom: 6px;
  font-size: 17px;
}

.document-summary p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.document-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  align-items: start;
  justify-content: center;
  gap: 68px;
  padding: 64px 0 100px;
}

.document-nav {
  position: sticky;
  top: 106px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.document-nav strong {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
}

.document-nav a {
  display: block;
  padding: 5px 0;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
}

.document-nav a:hover {
  color: var(--text);
}

.legal-document {
  min-width: 0;
}

.legal-document section {
  scroll-margin-top: 104px;
  margin-bottom: 48px;
}

.legal-document h2 {
  margin: 0 0 16px;
  font-size: 26px;
  line-height: 1.35;
  letter-spacing: -0.025em;
}

.legal-document h3 {
  margin: 24px 0 10px;
  font-size: 18px;
}

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

.legal-document p {
  margin: 0 0 14px;
}

.legal-document ul,
.legal-document ol {
  padding-left: 1.25em;
}

.legal-document li + li {
  margin-top: 8px;
}

.legal-document a {
  color: var(--text);
  text-underline-offset: 4px;
}

.legal-document code {
  overflow-wrap: anywhere;
  color: var(--text);
}

.notice {
  padding: 20px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 12px 12px 0;
}

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

.faq-item {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.faq-item h2 {
  margin-bottom: 8px;
  font-size: 19px;
}

.faq-item p {
  margin: 0;
}

.support-contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 20px 0 30px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-raised);
}

.support-contact-card strong {
  display: block;
  margin-bottom: 4px;
}

.support-contact-card p {
  margin: 0;
  font-size: 13px;
}

.support-contact-card .button {
  flex: 0 0 auto;
}

.feedback-list {
  margin-bottom: 24px;
}

.not-found {
  min-height: calc(100vh - 74px);
  display: grid;
  place-items: center;
  padding: 60px 0;
  text-align: center;
}

.not-found-code {
  margin: 0;
  color: var(--accent);
  font-size: clamp(84px, 18vw, 180px);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.08em;
}

.not-found h1 {
  margin: 24px 0 12px;
  font-size: clamp(30px, 5vw, 48px);
}

.not-found p {
  max-width: 520px;
  margin: 0 auto 28px;
  color: var(--muted);
}

.not-found-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.not-found-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 24px;
  margin-top: 28px;
  color: var(--muted);
  font-size: 13px;
}

.not-found-links a {
  text-underline-offset: 4px;
}

@media (max-width: 900px) {
  .hero {
    min-height: auto;
  }

  .hero-grid,
  .privacy-layout {
    grid-template-columns: 1fr;
  }

  .signal-stage {
    width: min(100%, 560px);
  }

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

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

  .step {
    min-height: 0;
  }

  .step::before {
    margin-bottom: 24px;
  }

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

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

  .document-summary {
    grid-template-columns: 1fr;
  }

  .document-nav {
    position: static;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(var(--content), calc(100% - 32px));
  }

  .menu-button {
    display: block;
  }

  .nav-shell {
    position: relative;
  }

  .nav-links {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    padding: 12px 16px 18px;
    border-bottom: 1px solid var(--line);
    background: rgba(23, 23, 23, 0.98);
  }

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

  .nav-links a {
    padding: 10px 8px;
  }

  .no-js .menu-button {
    display: none;
  }

  .no-js .nav-shell {
    align-items: flex-start;
    padding-block: 14px;
  }

  .no-js .nav-links {
    position: static;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    padding: 0;
    border: 0;
    background: transparent;
  }

  .hero {
    padding: 62px 0 76px;
  }

  .hero-grid {
    gap: 46px;
  }

  .hero h1 {
    font-size: clamp(42px, 13vw, 56px);
  }

  .hero-description,
  .section-heading > p:last-child,
  .privacy-copy > p,
  .contact-copy > p,
  .page-lead {
    font-size: 15px;
  }

  .hero-actions {
    display: grid;
  }

  .section {
    padding: 76px 0;
  }

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

  .feature-card {
    min-height: 0;
  }

  .privacy-layout {
    gap: 36px;
  }

  .contact-meta {
    min-width: 0;
  }

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

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

  .icp-line {
    text-align: left;
  }

  .page-hero {
    padding: 54px 0 36px;
  }

  .document-layout {
    padding: 44px 0 76px;
  }

  .support-contact-card {
    align-items: stretch;
    flex-direction: column;
  }

  .not-found-actions {
    display: grid;
  }
}

@media (max-width: 390px) {
  .brand-name small {
    display: none;
  }

  .signal-stage {
    border-radius: 28px;
  }

  .contact-panel {
    padding: 26px 20px;
  }
}

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

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