:root {
  --ink: #101629;
  --muted: #667085;
  --soft: #f6f8ff;
  --line: #e7ebf5;
  --blue: #3968ff;
  --blue-2: #7b8cff;
  --mint: #bdf4e7;
  --rose: #ff6b87;
  --paper: #ffffff;
  --shadow: 0 24px 70px rgba(36, 54, 115, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--paper);
  letter-spacing: 0;
}

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

.site-body {
  min-height: 100vh;
  overflow-x: hidden;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 18px 0;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-logo {
  display: block;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 12px 24px rgba(57, 104, 255, 0.28);
}

.site-nav {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a:hover {
  color: var(--blue);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 480px);
  gap: 56px;
  align-items: center;
  width: min(1160px, calc(100% - 40px));
  min-height: calc(100vh - 74px);
  margin: 0 auto;
  padding: 54px 0 78px;
}

.eyebrow,
.doc-kicker {
  margin: 0 0 16px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(58px, 8vw, 112px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-subtitle {
  max-width: 610px;
  margin: 26px 0 0;
  color: #46506a;
  font-size: 21px;
  line-height: 1.7;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
}

.button.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--blue-2));
  box-shadow: 0 18px 36px rgba(57, 104, 255, 0.25);
}

.button.secondary {
  color: var(--ink);
  border: 1px solid var(--line);
  background: #fff;
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  max-width: 650px;
  margin: 42px 0 0;
}

.trust-strip div {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.trust-strip dt {
  font-weight: 900;
}

.trust-strip dd {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.app-preview {
  position: relative;
  min-height: 640px;
  overflow: hidden;
  padding: 38px 22px 28px;
  border-radius: 8px;
  background:
    linear-gradient(145deg, rgba(57, 104, 255, 0.14), rgba(189, 244, 231, 0.2) 48%, rgba(255, 255, 255, 0.92)),
    linear-gradient(180deg, #f8fbff, #eef4ff);
  box-shadow: var(--shadow);
}

.app-preview::before {
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(57, 104, 255, 0.12);
  border-radius: 8px;
  content: "";
  pointer-events: none;
}

.app-preview::after {
  position: absolute;
  right: 24px;
  bottom: 24px;
  width: 42%;
  height: 26%;
  border: 1px solid rgba(57, 104, 255, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.52);
  content: "";
}

.preview-card {
  position: relative;
  z-index: 1;
  margin: 0;
}

.preview-card img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 20px;
  box-shadow: 0 26px 52px rgba(36, 54, 115, 0.22);
}

.preview-main {
  z-index: 2;
  width: min(62%, 288px);
  margin: 0 auto;
  transform: translateY(10px);
}

.preview-behind {
  position: absolute;
  z-index: 1;
  top: 92px;
  width: 39%;
  opacity: 0.78;
  filter: saturate(0.92);
}

.preview-behind img {
  box-shadow: 0 20px 42px rgba(36, 54, 115, 0.14);
}

.preview-behind-left {
  left: 22px;
  transform: rotate(-7deg);
}

.preview-behind-right {
  right: 22px;
  transform: rotate(7deg);
}

.preview-badge {
  position: absolute;
  z-index: 2;
  left: 34px;
  bottom: 34px;
  display: grid;
  gap: 2px;
  min-width: 128px;
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, 0.76);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
  box-shadow: 0 18px 32px rgba(36, 54, 115, 0.12);
}

.preview-badge span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.preview-badge strong {
  color: var(--blue);
  font-size: 24px;
  font-weight: 900;
}

.section {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 84px 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 34px;
}

.section-heading h2,
.privacy-band h2 {
  margin: 0;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1.12;
}

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

.feature-cards article {
  min-height: 260px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 14px 36px rgba(27, 40, 82, 0.06);
}

.card-icon {
  display: inline-flex;
  margin-bottom: 52px;
  color: var(--blue);
  font-weight: 900;
}

.feature-cards h3 {
  margin: 0 0 12px;
  font-size: 22px;
}

.feature-cards p,
.privacy-band p,
.privacy-list {
  color: #4d5872;
  line-height: 1.8;
}

.privacy-band {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  gap: 42px;
  align-items: center;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 52px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(57, 104, 255, 0.12), rgba(189, 244, 231, 0.35)),
    #f8fbff;
}

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

.privacy-list li {
  padding: 16px 18px;
  border: 1px solid rgba(57, 104, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.74);
}

.support-section-home {
  padding-bottom: 110px;
}

.support-section-home .section-heading p:not(.eyebrow) {
  margin: 16px 0 0;
  color: #4d5872;
  font-size: 17px;
  line-height: 1.8;
}

.support-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 14px 36px rgba(27, 40, 82, 0.06);
}

.support-panel span,
.support-panel strong {
  display: block;
}

.support-panel span {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
}

.support-panel strong {
  font-size: clamp(22px, 4vw, 34px);
  line-height: 1.2;
  word-break: break-all;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 26px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.site-footer div {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px 18px;
}

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

.doc-body {
  min-height: 100vh;
  background:
    radial-gradient(circle at top right, rgba(123, 140, 255, 0.16), transparent 34rem),
    linear-gradient(180deg, #f7f9ff, #ffffff 42%);
}

.doc-shell,
.support-shell {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 70px;
}

.doc-shell.narrow {
  width: min(760px, calc(100% - 32px));
}

.doc-back {
  display: inline-flex;
  align-items: center;
  margin: 0 0 18px;
  color: var(--blue);
  font-weight: 900;
}

.doc-card,
.support-card {
  padding: clamp(26px, 5vw, 54px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.doc-card h1,
.support-card h1 {
  margin: 0 0 18px;
  font-size: clamp(32px, 6vw, 54px);
  line-height: 1.12;
}

.lead {
  margin: 0 0 30px;
  color: #46506a;
  font-size: 17px;
  line-height: 1.85;
}

.doc-card section {
  padding-top: 10px;
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

.doc-card h2 {
  margin: 0 0 12px;
  font-size: 22px;
}

.doc-card h3 {
  margin: 18px 0 8px;
  color: var(--ink);
  font-size: 17px;
}

.doc-card p,
.doc-card li {
  color: #424b63;
  font-size: 15px;
  line-height: 1.9;
}

.doc-card a {
  color: var(--blue);
  font-weight: 800;
}

.notice {
  padding: 22px;
  border: 1px solid rgba(57, 104, 255, 0.18);
  border-radius: 8px;
  background: #f3f6ff;
}

.steps {
  padding-left: 22px;
}

.support-body {
  display: grid;
  place-items: center;
}

.support-card {
  min-height: 520px;
}

.support-methods {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.support-method {
  display: grid;
  align-content: start;
  gap: 14px;
  min-height: 310px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 14px 36px rgba(27, 40, 82, 0.06);
}

.support-method h2 {
  margin: 0;
  font-size: 24px;
}

.support-method p {
  margin: 0;
  color: #4d5872;
  line-height: 1.75;
}

.support-method dl {
  display: grid;
  gap: 10px;
  margin: 4px 0 6px;
}

.support-method dl div {
  display: grid;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.support-method dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.support-method dd {
  margin: 0;
  color: var(--ink);
  font-weight: 800;
  word-break: break-all;
}

.support-method .button {
  align-self: end;
  width: 100%;
}

.support-method button {
  border: 0;
  cursor: pointer;
}

.support-method button:disabled {
  cursor: wait;
  opacity: 0.72;
}

.support-error {
  min-height: 22px;
  margin: -12px 0 18px;
  color: #e5484d;
  font-size: 14px;
  line-height: 1.6;
}

.faq-fallback.compact {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
}

.faq-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
}

.faq-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.faq-card p {
  margin: 0;
  color: #4d5872;
  line-height: 1.7;
}

.intro-body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 0%, rgba(57, 104, 255, 0.12), transparent 28rem),
    linear-gradient(180deg, #f7f9ff, #ffffff 46%);
}

.intro-shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 30px 0 72px;
}

.intro-hero {
  display: grid;
  gap: 42px;
  padding: 22px 0 34px;
}

.intro-hero h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 86px);
  line-height: 1;
}

.intro-hero p:not(.eyebrow) {
  max-width: 720px;
  margin: 20px 0 0;
  color: #46506a;
  font-size: 18px;
  line-height: 1.8;
}

.intro-domain,
.intro-note,
.intro-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 14px 36px rgba(27, 40, 82, 0.06);
}

.intro-domain {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px;
}

.intro-domain span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
}

.intro-domain strong {
  font-size: clamp(20px, 4vw, 30px);
  word-break: break-all;
}

.intro-list {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.intro-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 22px;
  align-items: center;
  padding: 22px;
}

.intro-tag {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--blue);
  background: #eef3ff;
  font-size: 12px;
  font-weight: 900;
}

.intro-item h2,
.intro-note h2 {
  margin: 0;
  font-size: 22px;
}

.intro-item p,
.intro-note p {
  margin: 10px 0 12px;
  color: #4d5872;
  line-height: 1.75;
}

.intro-item code,
.intro-note code {
  display: inline-flex;
  max-width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #24304f;
  background: #f8fbff;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 13px;
  white-space: normal;
  word-break: break-all;
}

.intro-actions,
.intro-url-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-end;
}

.copy-button,
.intro-actions a,
.intro-url-line a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.copy-button {
  border: 0;
  color: #fff;
  background: var(--blue);
}

.intro-actions a,
.intro-url-line a {
  border: 1px solid var(--line);
  color: var(--ink);
  background: #fff;
}

.intro-note {
  margin-top: 18px;
  padding: 24px;
}

.intro-url-line {
  justify-content: flex-start;
}

.copy-toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 50;
  transform: translate(-50%, 20px);
  padding: 12px 18px;
  border-radius: 999px;
  color: #fff;
  background: rgba(16, 22, 41, 0.86);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

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

@media (max-width: 900px) {
  .site-nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 44px;
  }

  .trust-strip,
  .feature-cards,
  .privacy-band,
  .support-panel,
  .intro-item {
    grid-template-columns: 1fr;
  }

  .intro-actions {
    justify-content: flex-start;
  }

  .app-preview {
    min-height: 560px;
    padding: 30px 14px 22px;
  }

  .preview-main {
    width: min(58%, 260px);
    transform: translateY(0);
  }

  .preview-behind {
    top: 82px;
    width: 35%;
  }

  .privacy-band {
    padding: 30px;
  }
}

@media (max-width: 560px) {
  .site-header,
  .hero,
  .section,
  .privacy-band,
  .site-footer {
    width: min(100% - 28px, 1160px);
  }

  .hero-subtitle {
    font-size: 17px;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .app-preview {
    min-height: 510px;
  }

  .preview-main {
    width: min(66%, 238px);
  }

  .preview-behind {
    top: 96px;
    width: 34%;
  }

  .preview-behind-left {
    left: 10px;
  }

  .preview-behind-right {
    right: 10px;
  }

  .preview-badge {
    left: 20px;
    bottom: 20px;
    min-width: 112px;
    padding: 12px 14px;
  }

  .site-footer {
    display: grid;
  }

  .intro-domain {
    display: grid;
  }

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

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

}