@import url("/brand-tokens.css");

:root {
  color-scheme: light;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 28px;
}
body {
  margin: 0;
  background: var(--bs-canvas);
  color: var(--bs-text);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}
a {
  color: inherit;
  text-decoration: none;
}
a,
summary {
  -webkit-tap-highlight-color: transparent;
}
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--bs-action-hover);
  outline-offset: 5px;
}
a:hover {
  color: var(--bs-action-hover);
}
.wrap {
  max-width: 1240px;
  margin-inline: auto;
  width: calc(100% - 96px);
}
.header {
  min-height: 98px;
  display: flex;
  align-items: center;
  gap: 32px;
  border-bottom: 1px solid var(--bs-border);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 750;
  letter-spacing: -0.6px;
}
.brand-label {
  font-size: 11px;
  letter-spacing: 1px;
  font-weight: 500;
  color: var(--bs-text-muted);
  border-left: 1px solid var(--bs-border);
  padding-left: 12px;
  margin-left: 6px;
}
.header nav {
  display: flex;
  gap: 28px;
  margin-left: auto;
  font-size: 13px;
}
.login {
  font-size: 13px;
  border: 1px solid var(--bs-control-border);
  border-radius: 7px;
  padding: 8px 16px;
  white-space: nowrap;
}
.login span {
  margin-left: 15px;
}
.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  align-items: center;
  gap: 65px;
  padding-block: 85px 80px;
}
.eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.6px;
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 23px;
}
.dot {
  display: inline-block;
  background: var(--bs-brand);
  width: 7px;
  height: 7px;
  border-radius: 50%;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1 {
  font-size: clamp(38px, 4.2vw, 59px);
  line-height: 1.35;
  letter-spacing: -2px;
  font-weight: 750;
  margin-bottom: 24px;
}
.accent {
  color: var(--bs-brand);
  position: relative;
  white-space: nowrap;
  background: linear-gradient(
    transparent 69%,
    var(--bs-brand-soft) 69%,
    var(--bs-brand-soft) 94%,
    transparent 94%
  );
}
.lead {
  color: var(--bs-text-muted);
  font-size: 15px;
  line-height: 2.1;
  margin-bottom: 29px;
}
.actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 13px 20px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 600;
  transition:
    background 0.2s,
    transform 0.2s;
}
.button:hover {
  transform: translateY(-2px);
}
.primary {
  background: var(--bs-action);
  color: var(--bs-on-inverse);
}
.primary:hover {
  background: var(--bs-action-hover);
  color: var(--bs-on-inverse);
}
.secondary {
  border: 1px solid var(--bs-control-border);
  background: transparent;
}
.secondary:hover {
  background: var(--bs-brand-soft);
}
.hero-note {
  font-size: 11px;
  color: var(--bs-text-muted);
  margin: 19px 0 0;
  letter-spacing: 1px;
}
.preview {
  border: 1px solid var(--bs-border);
  background: var(--bs-surface);
  border-radius: 15px;
  box-shadow: 0 24px 55px rgba(36, 44, 46, 0.08);
  transform: rotate(1deg);
  overflow: hidden;
}
.preview-top {
  padding: 17px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--bs-border);
  font-size: 12px;
  font-weight: 650;
}
.preview-top .dot {
  margin-right: 7px;
}
.preview-tag {
  font-size: 10px;
  font-weight: 400;
  color: var(--bs-text-muted);
  border: 1px solid var(--bs-border);
  padding: 1px 7px;
  border-radius: 4px;
}
.preview-body {
  padding: 23px 22px 26px;
}
.preview-intro {
  font-size: 11px;
  color: var(--bs-text-muted);
  text-align: center;
  margin-bottom: 22px;
}
.bubble {
  font-size: 12px;
  line-height: 1.9;
  padding: 12px 15px;
  border-radius: 9px;
  margin-bottom: 16px;
}
.visitor {
  background: var(--bs-brand-soft);
  width: fit-content;
  margin-left: auto;
}
.reply {
  display: flex;
  gap: 9px;
  align-items: flex-start;
}
.avatar {
  font-size: 12px;
  flex: none;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--bs-inverse);
  color: var(--bs-on-inverse);
}
.assistant {
  border: 1px solid var(--bs-border);
  max-width: 90%;
}
.source {
  margin-top: 10px;
  border-top: 1px solid var(--bs-border);
  padding-top: 9px;
  color: var(--bs-text-muted);
  font-size: 10px;
}
.next-step {
  display: flex;
  gap: 13px;
  padding: 14px;
  background: var(--bs-canvas);
  border: 1px solid var(--bs-border);
  border-radius: 8px;
}
.next-step strong {
  font-size: 12px;
}
.next-step p {
  font-size: 10px;
  color: var(--bs-text-muted);
  margin: 3px 0 0;
}
.step-icon {
  font-size: 23px;
  color: var(--bs-action-hover);
}
.preview-bottom {
  display: flex;
  justify-content: center;
  gap: 23px;
  background: var(--bs-canvas);
  padding: 12px;
  font-size: 10px;
  color: var(--bs-text-muted);
  border-top: 1px solid var(--bs-border);
}
.principles {
  display: flex;
  gap: 50px;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--bs-border);
  border-bottom: 1px solid var(--bs-border);
  padding-block: 26px;
}
.principles p {
  font-size: 12px;
  color: var(--bs-text-muted);
  margin: 0;
}
.principles strong {
  color: var(--bs-text);
  font-weight: 500;
}
.principles > span {
  font-size: 13px;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.principles > span:before {
  content: "✳";
  color: var(--bs-brand);
  font-size: 24px;
}
.section {
  padding-block: 82px;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 28px;
  margin-bottom: 32px;
}
.section-heading .eyebrow {
  margin-bottom: 12px;
}
h2 {
  font-size: 30px;
  line-height: 1.5;
  letter-spacing: -0.6px;
  margin-bottom: 0;
}
.section-heading > p {
  font-size: 12px;
  color: var(--bs-text-muted);
  margin: 0;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.feature {
  padding: 29px 32px;
  background: var(--bs-surface);
  border: 1px solid var(--bs-border);
  border-radius: 10px;
}
.feature-number {
  font-size: 10px;
  letter-spacing: 1.3px;
  color: var(--bs-text-muted);
}
.feature h3 {
  font-size: 20px;
  margin: 20px 0 10px;
}
.feature p {
  font-size: 13px;
  color: var(--bs-text-muted);
  max-width: 440px;
  line-height: 1.9;
  margin-bottom: 25px;
}
.feature-label {
  font-size: 10px;
  color: var(--bs-action-hover);
  letter-spacing: 1px;
}
.scenarios {
  background: var(--bs-inverse);
  color: var(--bs-on-inverse);
}
.scenarios .eyebrow {
  color: var(--bs-inverse-muted);
  margin-bottom: 14px;
}
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-top: 37px;
}
.scenario-grid article {
  border-top: 1px solid var(--bs-inverse-border);
  padding-top: 23px;
}
.scenario-grid span {
  color: var(--bs-inverse-muted);
  font-size: 11px;
}
.scenario-grid h3 {
  font-size: 18px;
  margin: 14px 0 12px;
  font-weight: 550;
}
.scenario-grid p {
  font-size: 12px;
  color: var(--bs-inverse-muted);
  margin: 0;
  line-height: 1.95;
}
.text-link {
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}
.steps {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin: 38px 0 0;
}
.steps li {
  border-top: 1px solid var(--bs-border);
  padding-top: 18px;
}
.step-no {
  font-size: 32px;
  line-height: 1;
  color: var(--bs-text-muted);
  font-weight: 400;
}
.steps h3 {
  font-size: 18px;
  margin: 19px 0 10px;
}
.steps p {
  font-size: 12px;
  color: var(--bs-text-muted);
  line-height: 1.9;
  margin: 0;
}
.faq-section {
  border-top: 1px solid var(--bs-border);
  display: grid;
  grid-template-columns: 1fr 1.7fr;
  gap: 70px;
}
.faq-section .eyebrow {
  margin-bottom: 15px;
}
.faq-list details {
  border-bottom: 1px solid var(--bs-border);
  padding: 19px 0;
}
.faq-list details:first-child {
  padding-top: 0;
}
.faq-list summary {
  font-size: 14px;
  font-weight: 550;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}
.faq-list summary::-webkit-details-marker {
  display: none;
}
.faq-list summary:after {
  content: "+";
  font-size: 19px;
  font-weight: 400;
  line-height: 1.3;
}
.faq-list details[open] summary:after {
  content: "−";
}
.faq-list p {
  font-size: 12px;
  color: var(--bs-text-muted);
  margin: 13px 25px 0 0;
  line-height: 2;
}
.closing {
  background: var(--bs-brand-soft);
  border: 1px solid var(--bs-border);
  border-radius: 12px;
  padding: 40px 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
}
.closing .eyebrow {
  font-size: 10px;
  margin-bottom: 10px;
  color: var(--bs-action-hover);
}
.closing h2 {
  font-size: 29px;
}
.closing p:not(.eyebrow) {
  font-size: 12px;
  color: var(--bs-text-muted);
  margin: 15px 0 0;
}
.closing .actions {
  flex-direction: column;
  gap: 17px;
}
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  padding-block: 37px;
}
.footer .brand {
  font-size: 15px;
}
.footer p,
.footer > a:last-child {
  font-size: 10px;
  color: var(--bs-text-muted);
  margin: 0;
}
.skip {
  position: absolute;
  left: 15px;
  top: -70px;
  background: var(--bs-surface);
  padding: 10px;
  z-index: 3;
}
.skip:focus {
  top: 12px;
}
@media (min-width: 1500px) {
  .hero {
    padding-block: 105px;
  }
}
@media (max-width: 1000px) {
  .brand-label {
    display: none;
  }
  .wrap {
    width: calc(100% - 56px);
  }
  .header {
    gap: 22px;
  }
  .header nav {
    gap: 17px;
  }
  .hero {
    gap: 30px;
  }
  .hero h1 {
    font-size: 40px;
  }
  .hero .actions {
    gap: 10px;
  }
  .button {
    padding: 12px 15px;
    gap: 12px;
  }
  .principles {
    gap: 20px;
  }
  .principles > span {
    letter-spacing: 0;
  }
  .preview-body {
    padding: 20px 16px;
  }
  .faq-section {
    gap: 35px;
  }
}
@media (max-width: 720px) {
  .wrap {
    width: calc(100% - 40px);
  }
  .header {
    min-height: 80px;
    flex-wrap: wrap;
    gap: 15px;
    padding-block: 17px;
  }
  .brand {
    font-size: 18px;
  }
  .header nav {
    order: 3;
    width: 100%;
    justify-content: center;
    font-size: 12px;
    gap: 30px;
  }
  .login {
    margin-left: auto;
    padding: 6px 10px;
    font-size: 11px;
  }
  .login span {
    margin-left: 4px;
  }
  .hero {
    grid-template-columns: 1fr;
    padding-block: 45px;
    gap: 35px;
  }
  .hero h1 {
    font-size: 42px;
  }
  .lead {
    font-size: 14px;
  }
  .hero .eyebrow {
    font-size: 10px;
    letter-spacing: 1px;
  }
  .preview {
    transform: none;
  }
  .principles {
    flex-wrap: wrap;
    gap: 17px;
    padding-block: 24px;
  }
  .principles p {
    width: 100%;
    font-size: 12px;
  }
  .principles p br {
    display: none;
  }
  .principles strong {
    margin-left: 8px;
  }
  .principles > span {
    gap: 7px;
    font-size: 11px;
  }
  .principles > span:before {
    font-size: 18px;
  }
  .section {
    padding-block: 50px;
  }
  .section-heading {
    display: block;
    margin-bottom: 24px;
  }
  .section-heading > p,
  .section-heading > .text-link {
    display: block;
    margin-top: 13px;
  }
  h2 {
    font-size: 25px;
  }
  .feature-grid,
  .scenario-grid,
  .steps {
    grid-template-columns: 1fr;
    gap: 17px;
  }
  .feature {
    padding: 24px;
  }
  .feature h3 {
    font-size: 19px;
    margin-top: 14px;
  }
  .scenario-grid {
    gap: 25px;
  }
  .steps {
    margin-top: 25px;
    gap: 25px;
  }
  .steps h3 {
    margin-top: 12px;
  }
  .faq-section {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  .faq-section h2 br {
    display: none;
  }
  .closing {
    padding: 28px 24px;
    flex-direction: column;
    align-items: flex-start;
  }
  .closing h2 {
    font-size: 25px;
  }
  .closing .actions {
    align-items: flex-start;
  }
  .footer {
    flex-wrap: wrap;
    gap: 12px;
    padding-block: 27px;
  }
  .footer p {
    order: 3;
    width: 100%;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .button {
    transition: none;
  }
  .button:hover {
    transform: none;
  }
}