:root {
  --bg: #f5f5f7;
  --bg-soft: #ffffff;
  --surface: rgba(255, 255, 255, 0.85);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --line: rgba(0, 0, 0, 0.08);
  --text: #1d1d1f;
  --text-dim: rgba(29, 29, 31, 0.68);
  --text-soft: #6e6e73;
  --accent: #0071e3;
  --accent-2: #34aadc;
  --accent-3: #0066cc;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08), 0 1px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10), 0 2px 8px rgba(0, 0, 0, 0.06);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1200px;
  --gutter: clamp(0.9rem, 2vw, 1.25rem);
  --section-space: clamp(3.25rem, 6vw, 5.1rem);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 8%, rgba(0, 113, 227, 0.06), transparent 42%),
    radial-gradient(circle at 88% 14%, rgba(52, 170, 220, 0.05), transparent 38%),
    linear-gradient(180deg, #ffffff 0%, #f5f5f7 40%, #f0f0f3 100%);
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Source Han Sans SC",
    "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

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

.bg-orb,
.bg-grid {
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: -2;
}

.bg-orb {
  width: 34rem;
  height: 34rem;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.55;
}

.orb-a {
  top: -8rem;
  right: -10rem;
  background: radial-gradient(circle, rgba(0, 113, 227, 0.22), rgba(0, 113, 227, 0));
}

.orb-b {
  bottom: -10rem;
  left: -8rem;
  background: radial-gradient(circle, rgba(52, 170, 220, 0.18), rgba(52, 170, 220, 0));
}

.bg-grid {
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.045) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.55;
  mask-image: radial-gradient(circle at center, black 48%, transparent 92%);
  z-index: -3;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  width: min(calc(100% - (var(--gutter) * 2)), var(--max-width));
  margin: 1rem auto 0;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(0, 0, 0, 0.07);
  border-radius: 18px;
  backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.07);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.brand-mark {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 0.35rem;
  background: linear-gradient(135deg, #0077ed, #29bfe8);
  box-shadow: 0 2px 8px rgba(0, 113, 227, 0.38);
}

.nav-links {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.03);
}

.nav-links a {
  color: var(--text-dim);
  font-size: 0.92rem;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  transition: color 180ms ease, background-color 180ms ease;
}

.nav-links a:hover {
  color: var(--text);
  background: rgba(0, 0, 0, 0.05);
}

.section {
  width: min(calc(100% - (var(--gutter) * 2)), var(--max-width));
  margin: 0 auto;
  padding: var(--section-space) 0;
}

.hero {
  min-height: calc(100svh - 5rem);
  display: grid;
  place-items: center;
  position: relative;
  isolation: isolate;
}

.hero-layer {
  position: absolute;
  inset: 8% 0 auto;
  height: 70%;
  pointer-events: none;
  z-index: -1;
}

.hero-ring {
  position: absolute;
  border-radius: 999px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: inset 0 0 40px rgba(0, 113, 227, 0.04);
}

.ring-1 {
  width: min(72vw, 760px);
  height: min(72vw, 760px);
  left: 50%;
  top: 4%;
  transform: translateX(-50%);
}

.ring-2 {
  width: min(58vw, 580px);
  height: min(58vw, 580px);
  left: 50%;
  top: 18%;
  transform: translateX(-50%);
  border-color: rgba(52, 170, 220, 0.1);
}

.ring-3 {
  width: min(42vw, 420px);
  height: min(42vw, 420px);
  left: 50%;
  top: 30%;
  transform: translateX(-50%);
  border-color: rgba(0, 0, 0, 0.07);
}

.hero-content {
  text-align: center;
  max-width: 920px;
  padding-inline: clamp(0rem, 2vw, 1rem);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 500;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  font-weight: 700;
  color: var(--text);
}

.hero-subtitle {
  margin: 1.25rem auto 0;
  max-width: 760px;
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-dim);
  line-height: 1.75;
}

.hero-actions {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.8rem 1.4rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, background-color 180ms ease;
  cursor: pointer;
  min-height: 44px;
  letter-spacing: 0.01em;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, #0077ed, #29bfe8);
  box-shadow: 0 4px 16px rgba(0, 119, 237, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 8px 24px rgba(0, 119, 237, 0.38);
}

.btn-primary[data-track] {
  position: relative;
}

.btn-ghost {
  color: var(--text);
  border-color: rgba(0, 0, 0, 0.16);
  background: rgba(255, 255, 255, 0.6);
}

.btn-ghost:hover {
  border-color: rgba(0, 0, 0, 0.25);
  background: rgba(255, 255, 255, 0.9);
}

.btn-sm {
  padding: 0.58rem 0.9rem;
  font-size: 0.9rem;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.hero-metrics {
  list-style: none;
  margin: 2.25rem auto 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  max-width: 840px;
}

.hero-metrics li {
  border: 1px solid rgba(0, 0, 0, 0.07);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  border-radius: 16px;
  padding: 1rem 1rem 0.9rem;
  box-shadow: var(--shadow);
}

.metric-value {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.metric-label {
  display: block;
  margin-top: 0.3rem;
  color: var(--text-soft);
  font-size: 0.86rem;
}

.section-head {
  max-width: 820px;
  margin-bottom: 2rem;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3.4vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--text);
}

.section-head p:last-child {
  margin: 0.95rem 0 0;
  color: var(--text-dim);
  font-size: 1.02rem;
  line-height: 1.75;
}

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

.card {
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  border: 1px solid rgba(0, 0, 0, 0.07);
  background: #ffffff;
  box-shadow: var(--shadow);
}

.icon-badge {
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 0.78rem;
  background: linear-gradient(135deg, #0077ed, #34aadc);
}

.card h3 {
  margin: 0.9rem 0 0.4rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.card p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.65;
}

.transition-text {
  margin: 1.35rem 0 0;
  color: var(--accent);
  font-size: 1rem;
  font-weight: 500;
}

.workflow .section-head {
  margin-bottom: 2.5rem;
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  border: 1px solid rgba(0, 0, 0, 0.07);
  border-radius: var(--radius-lg);
  background: #ffffff;
  padding: 1.1rem;
  position: relative;
  box-shadow: var(--shadow);
}

.timeline-item::after {
  content: "";
  position: absolute;
  left: 2rem;
  top: calc(100% - 0.2rem);
  width: 1px;
  height: 0.9rem;
  background: linear-gradient(rgba(0, 113, 227, 0.3), rgba(52, 170, 220, 0));
}

.timeline-item:last-child::after {
  display: none;
}

.timeline-node {
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  color: #ffffff;
  font-weight: 700;
  background: linear-gradient(135deg, #0077ed, #29bfe8);
  box-shadow: 0 0 0 4px rgba(0, 119, 237, 0.1);
}

.timeline-content h3 {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text);
}

.timeline-content p {
  margin: 0.35rem 0 0;
  color: var(--text-dim);
  line-height: 1.65;
}

.is-hidden {
  display: none;
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.showcase-card {
  border: 1px solid rgba(0, 0, 0, 0.07);
  background: #ffffff;
  border-radius: var(--radius-xl);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.showcase-card.large {
  grid-column: 1 / -1;
}

.showcase-label {
  display: inline-block;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: rgba(0, 113, 227, 0.07);
  border: 1px solid rgba(0, 113, 227, 0.12);
}

.showcase-card h3 {
  margin: 0.8rem 0 1rem;
  font-size: 1.18rem;
  font-weight: 600;
  color: var(--text);
}

.chat-mockup {
  border-radius: 18px;
  border: 1px solid rgba(0, 0, 0, 0.07);
  background: #f5f5f7;
  padding: 0.9rem;
  display: grid;
  gap: 0.65rem;
}

.chat-row {
  max-width: 92%;
  padding: 0.75rem 0.85rem;
  border-radius: 14px;
  font-size: 0.94rem;
}

.chat-row.user {
  justify-self: end;
  background: rgba(0, 113, 227, 0.08);
  border: 1px solid rgba(0, 113, 227, 0.14);
  color: var(--text);
}

.chat-row.ai {
  justify-self: start;
  background: rgba(52, 170, 220, 0.07);
  border: 1px solid rgba(52, 170, 220, 0.14);
  color: var(--text-dim);
}

.graph-svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  background: linear-gradient(180deg, #f5f5f7, #ebebed);
  border: 1px solid rgba(0, 0, 0, 0.06);
  padding: 0.4rem;
}

.asset-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.asset-tile {
  min-height: 108px;
  border-radius: 16px;
  border: 1px solid rgba(0, 0, 0, 0.07);
  background: #f5f5f7;
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.asset-type {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
}

.asset-tile strong {
  font-size: 1rem;
  line-height: 1.25;
  color: var(--text);
}

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

.trust-card {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0, 0, 0, 0.07);
  background: #ffffff;
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.trust-card h3 {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text);
}

.trust-card p {
  margin: 0.55rem 0 0;
  color: var(--text-dim);
  line-height: 1.65;
}

.cta-panel {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1rem;
  padding: 1rem;
  border-radius: 30px;
  border: 1px solid rgba(0, 0, 0, 0.07);
  background: #ffffff;
  box-shadow: var(--shadow-lg);
}

.cta-copy {
  padding: 0.8rem;
}

.cta-copy h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

.cta-text {
  color: var(--text-dim);
  margin: 1rem 0 1.35rem;
  line-height: 1.75;
}

.criteria-block,
.process-block {
  margin-top: 1rem;
  padding: 0.95rem 1rem;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 16px;
  background: #f5f5f7;
}

.criteria-block h3,
.process-block h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.criteria-block p,
.process-block ol {
  margin: 0.55rem 0 0;
  color: var(--text-dim);
}

.process-block ol {
  padding-left: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
}

.contact-card {
  border-radius: 22px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  padding: 1.2rem;
  display: grid;
  gap: 0.8rem;
  align-content: start;
  box-shadow: var(--shadow);
}

.form-title {
  margin: 0.1rem 0 0.2rem;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
}

.contact-card label {
  display: grid;
  gap: 0.45rem;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.contact-card .consent-row {
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 0.65rem;
  padding: 0.2rem 0.1rem 0.1rem;
  font-size: 0.82rem;
  line-height: 1.45;
}

.contact-card .consent-row input[type="checkbox"] {
  margin: 0.15rem 0 0;
  inline-size: 1rem;
  block-size: 1rem;
  accent-color: var(--accent);
}

.contact-card .consent-row.is-invalid {
  color: #ff3b30;
}

.contact-card input,
.contact-card textarea {
  width: 100%;
  color: var(--text);
  background: #f5f5f7;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 12px;
  padding: 0.72rem 0.8rem;
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
  resize: vertical;
  font: inherit;
}

.contact-card input:focus,
.contact-card textarea:focus {
  border-color: rgba(0, 113, 227, 0.55);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.12);
  background: #ffffff;
}

.contact-card input.is-invalid,
.contact-card textarea.is-invalid {
  border-color: rgba(255, 59, 48, 0.6);
  box-shadow: 0 0 0 3px rgba(255, 59, 48, 0.11);
}

.contact-card.is-submitting {
  opacity: 0.96;
}

.contact-card.is-submitting #contactSubmitBtn {
  pointer-events: none;
  filter: saturate(0.9);
}

.form-status {
  min-height: 1.1rem;
  margin: -0.1rem 0 0;
  font-size: 0.82rem;
  color: var(--text-soft);
}

.form-status.is-success {
  color: #34c759;
}

.form-status.is-error {
  color: #ff3b30;
}

.success-next-steps {
  border-radius: 12px;
  border: 1px solid rgba(0, 113, 227, 0.15);
  background: rgba(0, 113, 227, 0.04);
  padding: 0.75rem 0.8rem;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.success-next-steps[hidden] {
  display: none;
}

.success-next-steps .success-title {
  margin: 0;
  color: var(--accent);
  font-weight: 700;
}

.success-next-steps ul {
  margin: 0.45rem 0 0;
  padding-left: 1.1rem;
}

.success-next-steps li + li {
  margin-top: 0.3rem;
}

.success-next-steps a {
  color: var(--accent);
}

.form-note {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.82rem;
}

.form-note a {
  color: var(--accent);
}

.bot-entry {
  margin-top: 0.1rem;
  padding: 0.65rem 0.8rem;
  border-radius: 12px;
  border: 1px dashed rgba(0, 113, 227, 0.22);
  color: var(--text-dim);
  background: rgba(0, 113, 227, 0.03);
  font-size: 0.86rem;
}

.site-footer {
  width: min(calc(100% - (var(--gutter) * 2)), var(--max-width));
  margin: 0 auto 1.6rem;
  padding: 1.2rem 1rem;
  border-radius: 18px;
  border: 1px solid rgba(0, 0, 0, 0.07);
  background: rgba(255, 255, 255, 0.7);
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.mobile-fab-shell,
.mobile-fab-cta {
  display: none;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.footer-brand strong {
  color: var(--text);
  font-size: 1rem;
}

.footer-brand p {
  margin: 0.25rem 0 0;
  color: var(--text);
  font-size: 0.9rem;
}

.footer-brand p strong {
  font-weight: 600;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
  flex: 1;
}

.footer-bottom {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-links a {
  color: var(--text-dim);
  font-size: 0.9rem;
}

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

.footer-icp {
  text-align: center;
}

.footer-icp a {
  color: var(--text-soft);
  font-size: 0.85rem;
  text-decoration: none;
  transition: color 0.2s;
  white-space: nowrap;
}

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

.footer-copyright {
  text-align: center;
}

.footer-copyright p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.85rem;
  white-space: nowrap;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms ease, transform 700ms ease;
}

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

@media (min-width: 1440px) {
  :root {
    --max-width: 1320px;
  }

  .section-head {
    max-width: 900px;
  }

  .hero-subtitle {
    max-width: 820px;
  }

  .pain-grid,
  .showcase-grid,
  .trust-grid {
    gap: 1.15rem;
  }
}

@media (min-width: 1560px) {
  :root {
    --max-width: 1480px;
  }

  .concept,
  .workflow,
  .forms,
  .trust {
    display: grid;
    grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
    gap: 1.2rem 1.4rem;
    align-items: start;
  }

  .concept .section-head,
  .workflow .section-head,
  .forms .section-head,
  .trust .section-head {
    grid-column: 1;
    margin-bottom: 0;
    position: sticky;
    top: 6.2rem;
  }

  .concept .pain-grid,
  .workflow .timeline,
  .forms .showcase-grid,
  .trust .trust-grid {
    grid-column: 2;
  }

  .concept .transition-text {
    grid-column: 2;
    margin-top: 0.15rem;
  }

  .concept .pain-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .workflow .timeline {
    gap: 1rem;
  }

  .forms .showcase-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 1.1rem;
  }

  .forms .showcase-card.large {
    grid-column: auto;
    grid-row: span 2;
    min-height: 100%;
  }

  .forms .showcase-card {
    min-height: 280px;
  }

  .forms .showcase-card.large .chat-mockup {
    min-height: 320px;
    align-content: start;
  }

  .trust .trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.1rem;
  }

  .cta-panel {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 1.2rem;
    padding: 1.15rem;
  }

  .cta-copy {
    padding: 1rem;
  }
}

@media (max-width: 1180px) {
  .site-header {
    gap: 0.75rem;
  }

  .nav-links {
    gap: 0.15rem;
  }

  .nav-links a {
    padding-inline: 0.6rem;
  }

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

  .hero-metrics li:last-child {
    grid-column: 1 / -1;
  }

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

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

@media (min-width: 900px) and (max-width: 1180px) and (orientation: landscape) {
  .cta-panel {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 0.9rem;
    align-items: start;
  }

  .cta-copy {
    padding: 0.7rem;
  }

  .cta-copy h2 {
    font-size: clamp(1.55rem, 2.5vw, 2rem);
  }

  .cta-text {
    margin: 0.7rem 0 1rem;
    font-size: 0.96rem;
  }

  .criteria-block,
  .process-block {
    padding: 0.8rem 0.9rem;
  }

  .contact-card {
    position: sticky;
    top: 6.2rem;
    padding: 0.9rem;
  }

  .contact-card label {
    gap: 0.35rem;
    font-size: 0.85rem;
  }

  .contact-card textarea {
    min-height: 88px;
  }
}

@media (max-width: 960px) {
  .site-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 0.7rem 0.85rem;
  }

  .nav-links {
    grid-column: 1 / -1;
    order: 3;
    display: flex;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 0.2rem;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.05);
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-links a {
    flex: 0 0 auto;
    white-space: nowrap;
    font-size: 0.88rem;
    padding: 0.45rem 0.65rem;
  }

  .hero {
    min-height: min(900px, calc(100svh - 4.5rem));
  }

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

  .showcase-card.large {
    grid-column: auto;
  }

  .site-footer {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .footer-brand {
    text-align: center;
    flex-direction: column;
  }

  .footer-links {
    justify-content: center;
    width: 100%;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
  }
}

@media (max-width: 760px) {
  body {
    padding-bottom: calc(env(safe-area-inset-bottom) + 8.6rem);
  }

  .hero-metrics {
    grid-template-columns: 1fr;
    max-width: 100%;
  }

  .hero-metrics li:last-child {
    grid-column: auto;
  }

  .pain-grid,
  .trust-grid {
    grid-template-columns: 1fr;
  }

  .section-head {
    margin-bottom: 1.5rem;
  }

  .showcase-card,
  .card,
  .trust-card {
    border-radius: 18px;
  }

  .cta-panel {
    border-radius: 22px;
    padding: 0.85rem;
  }

  .mobile-fab-shell {
    position: fixed;
    left: var(--gutter);
    right: var(--gutter);
    bottom: calc(env(safe-area-inset-bottom) + 0.75rem);
    z-index: 30;
    display: grid;
    gap: 0.45rem;
    transition: transform 220ms ease, opacity 220ms ease;
  }

  .mobile-fab-cta {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.1rem;
    padding: 0.78rem 0.95rem;
    border-radius: 16px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.92);
    box-shadow:
      0 8px 28px rgba(0, 0, 0, 0.12),
      0 0 0 1px rgba(0, 113, 227, 0.08) inset;
    backdrop-filter: blur(16px) saturate(180%);
    position: relative;
  }

  .mobile-fab-cta::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.05), rgba(52, 170, 220, 0.07));
    opacity: 0.8;
  }

  .mobile-fab-title,
  .mobile-fab-subtitle {
    position: relative;
    z-index: 1;
  }

  .mobile-fab-title {
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--text);
    line-height: 1.1;
  }

  .mobile-fab-subtitle {
    color: var(--text-soft);
    font-size: 0.78rem;
  }

  .mobile-fab-secondary {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.45rem;
  }

  .mobile-fab-chip {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0.55rem 0.65rem;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.09);
    background: rgba(255, 255, 255, 0.82);
    color: var(--text-dim);
    font-size: 0.8rem;
    backdrop-filter: blur(8px);
    transition: background-color 180ms ease, border-color 180ms ease, transform 180ms ease;
  }

  .mobile-fab-chip:active {
    transform: translateY(1px);
  }

  .mobile-fab-chip:hover {
    background: rgba(255, 255, 255, 0.96);
    border-color: rgba(0, 0, 0, 0.13);
  }

  .mobile-fab-shell.is-hidden-by-target {
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
  }
}

@media (max-width: 640px) {
  .site-header {
    margin-top: 0.7rem;
    padding: 0.65rem 0.7rem;
    border-radius: 14px;
  }

  .section {
    padding: clamp(2.7rem, 8vw, 3.2rem) 0;
  }

  .hero {
    min-height: auto;
    padding-top: 1.75rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    text-align: center;
    padding-block: 0.78rem;
  }

  .timeline-item {
    gap: 0.8rem;
    padding: 0.9rem;
  }

  .timeline-item::after {
    left: 1.9rem;
    height: 0.7rem;
  }

  .chat-row {
    max-width: 100%;
  }

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

  .cta-copy {
    padding: 0.45rem;
  }

  .contact-card {
    padding: 0.85rem;
    border-radius: 18px;
  }

  .form-title {
    font-size: 1.08rem;
    letter-spacing: 0.04em;
  }

  #heroPrimaryCta {
    box-shadow:
      0 8px 24px rgba(0, 119, 237, 0.2),
      0 0 0 0 rgba(0, 119, 237, 0.18);
    animation: ctaPulse 2.8s ease-in-out infinite;
  }
}

@media (max-width: 480px) {
  :root {
    --gutter: 0.75rem;
  }

  .site-header {
    grid-template-columns: 1fr;
    gap: 0.55rem;
  }

  .site-header > .btn {
    width: 100%;
    text-align: center;
  }

  .brand-text {
    font-size: 0.95rem;
  }

  .hero-subtitle,
  .section-head p:last-child,
  .cta-text {
    font-size: 0.95rem;
  }

  .card,
  .showcase-card,
  .trust-card {
    padding: 0.95rem;
  }

  .chat-mockup {
    padding: 0.75rem;
    gap: 0.55rem;
  }

  .chat-row {
    font-size: 0.88rem;
    padding: 0.65rem 0.72rem;
    border-radius: 12px;
  }

  .site-footer {
    margin-bottom: 1rem;
    padding: 0.85rem 0.8rem;
    border-radius: 14px;
  }

  .mobile-fab-cta {
    border-radius: 14px;
    padding: 0.72rem 0.85rem;
  }

  .mobile-fab-secondary {
    gap: 0.35rem;
  }

  .mobile-fab-chip {
    border-radius: 10px;
    font-size: 0.76rem;
    padding-inline: 0.45rem;
  }

  .mobile-fab-title {
    font-size: 0.96rem;
  }

  .footer-links {
    gap: 0.55rem 0.8rem;
  }
}

@media (max-height: 760px) and (min-width: 720px) {
  .hero {
    min-height: auto;
    padding-top: 2rem;
    padding-bottom: 1rem;
  }

  .hero-actions {
    margin-top: 1.4rem;
  }

  .hero-metrics {
    margin-top: 1.5rem;
  }
}

@media (hover: none) and (pointer: coarse) {
  .nav-links a {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
  }

  .contact-card input,
  .contact-card textarea {
    font-size: 16px;
  }

  .mobile-fab-cta {
    min-height: 54px;
  }

  .mobile-fab-chip {
    min-height: 42px;
  }
}

@keyframes ctaPulse {
  0%,
  100% {
    box-shadow:
      0 8px 24px rgba(0, 119, 237, 0.18),
      0 0 0 0 rgba(0, 119, 237, 0.15);
  }
  50% {
    box-shadow:
      0 10px 28px rgba(0, 119, 237, 0.24),
      0 0 0 8px rgba(0, 119, 237, 0);
  }
}

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

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

  .btn,
  .nav-links a,
  .mobile-fab-cta,
  .mobile-fab-shell,
  .mobile-fab-chip,
  #heroPrimaryCta {
    transition: none;
  }

  #heroPrimaryCta {
    animation: none;
  }
}

/* 邮件咨询模态框样式 */
.email-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--gutter);
  animation: fadeIn 0.2s ease-out;
}

.email-modal[hidden] {
  display: none;
}

.email-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.email-modal-content {
  position: relative;
  background: var(--surface-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 100%;
  padding: 2rem;
  animation: slideUp 0.3s ease-out;
}

.email-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 2rem;
  line-height: 1;
  color: var(--text-soft);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  transition: color 0.2s;
}

.email-modal-close:hover {
  color: var(--text);
}

.email-modal-title {
  margin: 0 0 1.5rem 0;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
}

.email-modal-form label {
  display: block;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.email-modal-form .required {
  color: #ff3b30;
}

.email-modal-form input,
.email-modal-form textarea {
  display: block;
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-soft);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.email-modal-form input:focus,
.email-modal-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.email-modal-form textarea {
  resize: vertical;
  min-height: 100px;
}

.email-modal-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.email-modal-actions .btn {
  flex: 1;
}

.email-modal-status {
  margin: 1rem 0 0 0;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.5rem;
}

.email-modal-status.is-success {
  color: #34c759;
}

.email-modal-status.is-error {
  color: #ff3b30;
}

.email-modal-form.is-submitting input,
.email-modal-form.is-submitting textarea,
.email-modal-form.is-submitting button {
  opacity: 0.6;
  pointer-events: none;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .email-modal-content {
    padding: 1.5rem;
  }

  .email-modal-title {
    font-size: 1.25rem;
  }
}