:root {
  --ink: #142238;
  --ink-soft: #526176;
  --ink-faint: #758399;
  --paper: #fbfcfe;
  --paper-warm: #f4f7fb;
  --line: #dce4ee;
  --blue: #2157b8;
  --blue-dark: #183c82;
  --cyan: #128bb1;
  --navy: #102445;
  --navy-deep: #0b1932;
  --shadow: 0 20px 50px rgba(16, 36, 69, 0.11);
  --shadow-soft: 0 12px 30px rgba(16, 36, 69, 0.07);
  --radius: 18px;
  --radius-lg: 28px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  display: block;
  max-width: 100%;
}
h1,
h2,
h3,
p,
ol {
  margin: 0;
  padding: 0;
}

.container {
  width: min(100% - 48px, var(--container));
  margin: 0 auto;
}
.navbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(220, 228, 238, 0.7);
  background: rgba(251, 252, 254, 0.84);
  backdrop-filter: blur(18px);
}
.nav-inner {
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand,
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 760;
  letter-spacing: -0.02em;
}
.nav-links {
  display: none;
  align-items: center;
  gap: 28px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
}
.nav-links > a:not(.btn):hover {
  color: var(--blue);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: 11px;
  font-weight: 700;
  white-space: nowrap;
  transition:
    transform 0.2s ease,
    background 0.2s ease,
    border 0.2s ease,
    box-shadow 0.2s ease;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn-sm {
  padding: 9px 15px;
  font-size: 14px;
}
.btn-lg {
  padding: 14px 21px;
  font-size: 15px;
}
.btn-primary {
  color: #fff;
  background: var(--blue);
  box-shadow: 0 10px 22px rgba(33, 87, 184, 0.24);
}
.btn-primary:hover {
  background: var(--blue-dark);
  box-shadow: 0 13px 28px rgba(33, 87, 184, 0.3);
}
.btn-secondary {
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
}
.btn-secondary:hover {
  border-color: #aebfd4;
  box-shadow: var(--shadow-soft);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 86px 0 92px;
  background: linear-gradient(135deg, #f9fbff 0%, #eef5fb 57%, #f8fbff 100%);
}
.hero:before {
  content: "";
  position: absolute;
  width: 660px;
  height: 660px;
  top: -330px;
  left: 40%;
  border: 1px solid rgba(33, 87, 184, 0.1);
  border-radius: 50%;
  box-shadow:
    0 0 0 70px rgba(33, 87, 184, 0.035),
    0 0 0 140px rgba(33, 87, 184, 0.025);
}
.hero:after {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  right: -220px;
  bottom: -310px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(18, 139, 177, 0.11),
    transparent 70%
  );
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 54px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 11px;
  border: 1px solid rgba(33, 87, 184, 0.15);
  border-radius: 999px;
  color: var(--blue-dark);
  background: rgba(255, 255, 255, 0.66);
  font-size: 13px;
  font-weight: 700;
}
.eyebrow-dot,
.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #32a46c;
  box-shadow: 0 0 0 4px rgba(50, 164, 108, 0.13);
}
.hero-title {
  max-width: 600px;
  margin-top: 20px;
  font-size: clamp(42px, 5.1vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.065em;
  font-weight: 790;
}
.hero-title span {
  color: var(--blue);
}
.hero-subtitle {
  max-width: 520px;
  margin-top: 24px;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.8;
}
.hero-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.hero-trust {
  margin-top: 25px;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  color: var(--ink-faint);
  font-size: 13px;
}
.hero-trust span {
  padding: 0 13px;
  border-left: 1px solid var(--line);
}
.hero-trust span:first-child {
  padding-left: 0;
  border-left: 0;
}
.hero-visual {
  position: relative;
  padding: 20px 0 12px;
}
.hero-demo {
  position: relative;
  z-index: 2;
  width: 100%;
  aspect-ratio: 16/10;
}
.hero-orbit {
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  border: 1px solid rgba(18, 139, 177, 0.16);
}
.orbit-one {
  width: 84%;
  height: 84%;
  right: -13%;
  top: -8%;
}
.orbit-two {
  width: 58%;
  height: 58%;
  left: -16%;
  bottom: -11%;
  border-color: rgba(33, 87, 184, 0.12);
}
.hero-floating-note {
  position: absolute;
  z-index: 3;
  right: -7px;
  bottom: 0;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 11px 14px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 12px;
  color: #314256;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-soft);
  font-size: 12px;
  font-weight: 700;
}

.section {
  padding: 105px 0;
}
.section-kicker,
.section-tag {
  display: inline-block;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.section-tag {
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(33, 87, 184, 0.08);
  letter-spacing: 0;
}
.section-header {
  max-width: 700px;
  margin: 0 auto 60px;
  text-align: center;
}
.section-header .section-tag {
  margin-bottom: 15px;
}
.section-title {
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.17;
  letter-spacing: -0.045em;
}
.section-desc {
  margin: 16px auto 0;
  max-width: 620px;
  color: var(--ink-soft);
  line-height: 1.75;
  font-size: 17px;
}

.problem-section {
  background: #fff;
}
.split-heading {
  display: grid;
  gap: 25px;
  align-items: end;
  max-width: 1050px;
  margin: 18px auto 54px;
}
.split-heading h2 {
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.2;
  letter-spacing: -0.045em;
}
.split-heading p {
  max-width: 420px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.problem-grid {
  display: grid;
  gap: 14px;
}
.problem-card {
  min-height: 220px;
  padding: 29px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}
.problem-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}
.problem-card-accent {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
}
.problem-no {
  color: var(--cyan);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
}
.problem-card h3 {
  margin-top: auto;
  font-size: 21px;
  letter-spacing: -0.03em;
}
.problem-card p {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}
.problem-card-accent p {
  color: #b9cae7;
}

.workflow-section {
  background: var(--paper-warm);
}
.workflow-row {
  display: grid;
  gap: 34px;
  align-items: center;
  margin-top: 72px;
}
.workflow-copy {
  max-width: 490px;
}
.feature-index {
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.075em;
}
.workflow-copy h3 {
  margin-top: 12px;
  font-size: clamp(28px, 3.1vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.045em;
}
.workflow-copy p {
  margin-top: 17px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.chip-list span {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #4c5d72;
  background: #fff;
  font-size: 12px;
  font-weight: 700;
}
.workflow-media {
  width: 100%;
}
.demo-placeholder {
  width: 100%;
  aspect-ratio: 16/10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 24px;
  border: 1.5px dashed #b5c6dc;
  border-radius: 20px;
  color: var(--ink-faint);
  background: linear-gradient(145deg, #fff, #edf3f9);
  text-align: center;
  transition: 0.2s ease;
}
.demo-placeholder:hover {
  border-color: var(--blue);
  background: #f7fbff;
}
.demo-placeholder-icon {
  color: var(--blue);
  font-size: 39px;
  line-height: 1;
}
.demo-placeholder-title {
  color: #43556c;
  font-weight: 750;
}
.demo-placeholder-hint {
  font-size: 12px;
}
.feature-gif {
  display: block;
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  border: 1px solid #cfd9e6;
  border-radius: 10px;
  box-shadow: 0 16px 36px rgba(16, 36, 69, 0.12);
}
.hero-demo.feature-gif {
  border-radius: 16px;
  border-color: rgba(255, 255, 255, 0.92);
  box-shadow: 0 24px 58px rgba(16, 36, 69, 0.16);
}

.ai-context-section {
  color: #fff;
  background: linear-gradient(120deg, var(--navy-deep), var(--navy));
}
.ai-context-wrap {
  display: grid;
  gap: 54px;
  align-items: center;
}
.section-tag-dark {
  color: #8dd9e9;
  background: rgba(141, 217, 233, 0.12);
}
.ai-context-copy h2 {
  margin-top: 15px;
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.13;
  letter-spacing: -0.05em;
}
.ai-context-copy > p {
  margin-top: 18px;
  max-width: 545px;
  color: #b9cae7;
  line-height: 1.85;
}
.ai-context-copy .ai-context-note {
  font-size: 13px;
  color: #83a1ca;
}
.context-flow {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.flow-step {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  border: 1px solid rgba(180, 210, 255, 0.16);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.055);
}
.flow-step b {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: #b6f3ff;
  background: rgba(18, 139, 177, 0.28);
  font-size: 12px;
}
.flow-step span {
  font-weight: 700;
}
.flow-line {
  width: 1px;
  height: 12px;
  margin-left: 29px;
  background: #39638d;
}

.scenario-section {
  background: #fff;
}
.scenario-grid {
  display: grid;
  gap: 14px;
}
.scenario-card {
  padding: 32px;
  border-top: 3px solid #b5c8dd;
  background: var(--paper-warm);
}
.scenario-card:nth-child(2) {
  border-color: var(--cyan);
}
.scenario-card:nth-child(3) {
  border-color: var(--blue);
}
.scenario-mark {
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.09em;
}
.scenario-card h3 {
  margin-top: 40px;
  font-size: 21px;
  letter-spacing: -0.03em;
}
.scenario-card p {
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.8;
}

.privacy-section {
  background: #eaf0f7;
}
.privacy-layout {
  display: grid;
  gap: 48px;
  align-items: start;
}
.privacy-intro h2 {
  margin-top: 15px;
  font-size: clamp(32px, 4vw, 47px);
  line-height: 1.18;
  letter-spacing: -0.05em;
}
.privacy-intro p {
  margin-top: 18px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.privacy-list {
  border-top: 1px solid #cbd8e6;
}
.privacy-list article {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 13px;
  padding: 19px 0;
  border-bottom: 1px solid #cbd8e6;
}
.privacy-list article > span {
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
}
.privacy-list h3 {
  font-size: 16px;
}
.privacy-list p {
  margin-top: 7px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}

.cost-section {
  background: #fff;
}
.cost-layout {
  display: grid;
  gap: 38px;
  align-items: center;
}
.cost-intro h2 {
  margin-top: 15px;
  font-size: clamp(32px, 4vw, 47px);
  line-height: 1.18;
  letter-spacing: -0.05em;
}
.cost-intro > p {
  margin-top: 18px;
  max-width: 510px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.cost-intro .cost-note {
  font-size: 12px;
  color: var(--ink-faint);
}
.model-cards {
  display: grid;
  gap: 14px;
}
.model-card {
  min-height: 220px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-warm);
}
.model-card-dark {
  border-color: var(--navy);
  color: #fff;
  background: var(--navy);
}
.model-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.model-badge {
  padding: 5px 8px;
  border-radius: 6px;
  color: var(--blue);
  background: #e5eefb;
  font-size: 11px;
  font-weight: 800;
}
.model-card-dark .model-badge {
  color: #9feaf5;
  background: rgba(18, 139, 177, 0.25);
}
.model-index {
  color: #8da0b7;
  font-size: 12px;
  font-weight: 800;
}
.model-card h3 {
  margin-top: 28px;
  font-size: 20px;
  letter-spacing: -0.03em;
}
.model-card p {
  margin-top: 9px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}
.model-card-dark p {
  color: #b9cae7;
}
.model-cost {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin-top: 23px;
  padding-top: 15px;
  border-top: 1px solid #d5e0ed;
}
.model-card-dark .model-cost {
  border-color: rgba(185, 202, 231, 0.2);
}
.model-cost strong {
  font-size: 13px;
}
.model-cost span {
  color: var(--blue);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.model-card-dark .model-cost span {
  color: #9feaf5;
}

.start-section {
  background: #fff;
}
.steps {
  list-style: none;
  display: grid;
  gap: 13px;
  counter-reset: steps;
}
.steps li {
  display: grid;
  grid-template-columns: 43px 1fr;
  gap: 18px;
  align-items: center;
  padding: 22px;
  border-bottom: 1px solid var(--line);
}
.steps b {
  display: flex;
  width: 35px;
  height: 35px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--blue);
  background: #e9f0fb;
  font-size: 14px;
}
.steps h3 {
  font-size: 18px;
}
.steps p {
  margin-top: 5px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.65;
}

.faq-section {
  background: var(--paper-warm);
}
.faq-list {
  max-width: 820px;
  margin: auto;
  display: grid;
  gap: 10px;
}
.faq-item {
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #fff;
  overflow: hidden;
}
.faq-item summary {
  position: relative;
  padding: 19px 55px 19px 20px;
  list-style: none;
  cursor: pointer;
  font-weight: 750;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary:after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--blue);
  font-size: 23px;
  font-weight: 400;
}
.faq-item[open] summary:after {
  transform: translateY(-50%) rotate(45deg);
}
.faq-item p {
  padding: 0 20px 20px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.8;
}

.final-cta-section {
  padding: 58px 0 86px;
  background: #fff;
}
.final-cta {
  position: relative;
  overflow: hidden;
  padding: 58px 30px;
  border-radius: var(--radius-lg);
  color: #fff;
  background: linear-gradient(135deg, #174184, var(--navy));
}
.final-cta:after {
  content: "";
  position: absolute;
  right: -100px;
  top: -150px;
  width: 410px;
  height: 410px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  box-shadow:
    0 0 0 55px rgba(255, 255, 255, 0.04),
    0 0 0 110px rgba(255, 255, 255, 0.025);
}
.final-cta > * {
  position: relative;
  z-index: 1;
}
.final-cta .section-kicker {
  color: #96d6e5;
}
.final-cta h2 {
  margin-top: 16px;
  font-size: clamp(35px, 4.8vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.06em;
}
.final-cta > p:not(.section-kicker) {
  margin-top: 18px;
  color: #c4d4ea;
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 29px;
}
.btn-light {
  color: var(--blue-dark);
  background: #fff;
}
.btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.06);
}
.footer {
  padding: 30px 0;
  border-top: 1px solid var(--line);
  background: #fff;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
  text-align: center;
}
.footer-copy,
.footer-links {
  color: var(--ink-faint);
  font-size: 13px;
}
.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a:hover {
  color: var(--blue);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.55s ease,
    transform 0.55s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
  .split-heading {
    grid-template-columns: 1.25fr 0.75fr;
  }
  .problem-grid {
    grid-template-columns: 1fr 1.18fr 1fr;
  }
  .scenario-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .steps li {
    display: block;
    padding: 8px 22px 8px 0;
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }
  .steps li:last-child {
    border-right: 0;
    padding-right: 0;
  }
  .steps b {
    margin-bottom: 28px;
  }
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}
@media (min-width: 980px) {
  .hero-inner {
    grid-template-columns: 0.88fr 1.12fr;
    gap: 66px;
  }
  .workflow-row {
    grid-template-columns: 0.84fr 1.16fr;
    gap: 82px;
  }
  .workflow-row-reverse .workflow-copy {
    order: 2;
    justify-self: end;
  }
  .workflow-row-reverse .workflow-media {
    order: 1;
  }
  .ai-context-wrap {
    grid-template-columns: 1fr 0.9fr;
    gap: 100px;
  }
  .privacy-layout {
    grid-template-columns: 0.82fr 1.18fr;
    gap: 100px;
  }
  .cost-layout {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 100px;
  }
  .model-cards {
    grid-template-columns: 1fr 1fr;
  }
  .final-cta {
    padding: 70px 78px;
  }
}
@media (max-width: 767px) {
  .container {
    width: min(100% - 36px, var(--container));
  }
  .hero {
    padding: 58px 0 74px;
  }
  .hero-title {
    font-size: 44px;
  }
  .hero-subtitle {
    font-size: 16px;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .hero-trust {
    gap: 8px 0;
  }
  .hero-visual {
    margin-top: 5px;
  }
  .hero-floating-note {
    right: -5px;
    bottom: -5px;
  }
  .section {
    padding: 76px 0;
  }
  .section-header {
    margin-bottom: 44px;
  }
  .workflow-row {
    margin-top: 54px;
  }
  .final-cta {
    padding: 44px 25px;
  }
  .cta-actions .btn {
    width: 100%;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *:before,
  *:after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}