:root {
  --home-brand: #08b957;
  --home-brand-deep: #079649;
  --home-brand-soft: #eaf8ef;
  --home-brand-pale: #f5fbf7;
  --home-ink: #101a14;
  --home-muted: #69766e;
  --home-faint: #9aa39d;
  --home-line: #e6ebe7;
  --home-surface: #ffffff;
  --home-footer: #0b2119;
  --home-radius: 18px;
  --home-shadow: 0 18px 50px rgba(35, 77, 54, 0.09);
}

html {
  scroll-behavior: smooth;
}

body {
  background: #ffffff;
  color: var(--home-ink);
}

body.menu-open {
  overflow: hidden;
}

.wrap {
  width: min(1280px, calc(100% - 64px));
  max-width: none;
  padding: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 15;
  border-bottom: 1px solid #dfe6e1;
  background: #ffffff;
  box-shadow: 0 6px 24px rgba(39, 71, 53, 0.06);
}

.nav {
  min-height: 70px;
  padding: 0;
}

.wordmark {
  width: 125px;
  height: 36px;
}

.navlinks {
  align-self: stretch;
  align-items: stretch;
  gap: 40px;
  font-size: 14px;
  color: #3e4942;
}

.navlinks a {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.navlinks a.active {
  color: var(--home-ink);
  font-weight: 650;
}

.navlinks a.active::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--home-brand);
  content: "";
}

.nav-actions {
  gap: 12px;
}

.btn {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 20px;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 650;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, background 160ms ease;
}

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

.btn-solid {
  border-color: var(--home-brand);
  background: var(--home-brand);
  color: #ffffff;
  box-shadow: 0 8px 18px rgba(8, 185, 87, 0.2);
}

.btn-solid:hover {
  border-color: var(--home-brand-deep);
  background: var(--home-brand-deep);
  box-shadow: 0 10px 24px rgba(8, 185, 87, 0.26);
}

.btn-ghost {
  border-color: #d9dfda;
  background: #ffffff;
  color: #263129;
}

.btn-ghost:hover {
  border-color: #a8cab5;
  color: var(--home-brand-deep);
}

.btn-lg {
  min-height: 50px;
  padding: 0 29px;
  border-radius: 10px;
  font-size: 15px;
}

.burger {
  border-radius: 10px;
  font-size: 21px;
}

.navdrop {
  position: fixed;
  top: 70px;
  right: 0;
  left: 0;
  z-index: 14;
  width: 100%;
  padding: 12px 24px 22px;
  border-bottom: 1px solid var(--home-line);
  background: #ffffff;
  box-shadow: 0 20px 35px rgba(23, 55, 36, 0.08);
}

.hero-shell {
  position: relative;
  overflow: hidden;
  padding: 38px 0 30px;
  background: #fbfefc;
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: center;
  gap: 44px;
}

.hero-copy {
  padding: 20px 0 18px;
}

.eyebrow {
  margin: 0 0 24px;
  padding: 8px 14px;
  background: var(--home-brand-soft);
  color: var(--home-brand-deep);
  font-size: 13px;
  letter-spacing: 0;
}

.hero-copy h1 {
  max-width: 600px;
  margin: 0 0 22px;
  font-size: clamp(44px, 3.9vw, 56px);
  font-weight: 780;
  letter-spacing: -0.045em;
  line-height: 1.17;
}

.hero-copy h1 strong {
  color: var(--home-brand);
  font-weight: inherit;
}

.hero-copy > p {
  max-width: 570px;
  margin: 0 0 28px;
  color: #59665e;
  font-size: 16px;
  line-height: 1.9;
}

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

.platform-block {
  margin-top: 26px;
}

.platform-caption {
  display: block;
  margin-bottom: 13px;
  color: #808b84;
  font-size: 12px;
}

.platforms {
  justify-content: flex-start;
  gap: 10px;
  padding: 0;
}

.plat-badge {
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid #e0e6e2;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.92);
  color: #3b463f;
  font-size: 12px;
  box-shadow: 0 4px 14px rgba(37, 68, 49, 0.03);
}

.plat-badge i {
  font-size: 17px;
}

.platform-douyin i { color: #15181c; }
.platform-taobao i { color: #ff5a1f; }
.platform-pdd i { color: #e02e24; }
.platform-xhs i { color: #ff2442; }
.platform-ks i { color: #ff6f2c; }
.platform-wx i { color: #f5a623; }

.workspace-frame {
  position: relative;
  min-width: 0;
  border: 1px solid #dfe9e2;
  border-radius: 22px;
  background: #ffffff;
  box-shadow: var(--home-shadow);
}

.workspace-window {
  display: grid;
  min-height: 420px;
  grid-template-columns: 148px minmax(0, 1fr);
  overflow: hidden;
  border-radius: inherit;
}

.workspace-side {
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  border-right: 1px solid #eef2ef;
  background: #fbfdfb;
}

.workspace-mini-logo {
  width: 86px;
  height: 29px;
  margin: 1px 7px 16px;
  object-fit: contain;
  object-position: left center;
}

.workspace-new {
  min-height: 34px;
  margin-bottom: 12px;
  border: 0;
  border-radius: 8px;
  background: var(--home-brand);
  color: #ffffff;
  font: inherit;
  font-size: 11px;
  font-weight: 650;
}

.workspace-nav {
  display: grid;
  gap: 6px;
}

.workspace-nav span {
  display: flex;
  min-height: 34px;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  border-radius: 8px;
  color: #6c756f;
  font-size: 11px;
}

.workspace-nav span.active {
  background: #eef8f1;
  color: var(--home-brand-deep);
}

.workspace-group {
  margin-top: auto;
  padding: 12px 10px;
  border: 1px solid #e6eee8;
  border-radius: 10px;
  background: #f1f8f3;
}

.workspace-group strong {
  display: block;
  margin-bottom: 5px;
  font-size: 10px;
}

.workspace-group span {
  color: #7e8c83;
  font-size: 9px;
  line-height: 1.6;
}

.workspace-main {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 18px 18px 16px;
}

.workspace-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 15px;
  color: #59655e;
  font-size: 10px;
}

.live-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 5px;
  border-radius: 50%;
  background: var(--home-brand);
}

.workspace-chat {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 12px;
  padding: 4px 0 14px;
}

.chat-line {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.chat-line.mine {
  justify-content: flex-end;
}

.chat-avatar {
  display: inline-flex;
  width: 27px;
  height: 27px;
  flex: 0 0 27px;
  align-items: center;
  justify-content: center;
  border: 1px solid #e2e9e4;
  border-radius: 50%;
  background: #ffffff;
  color: var(--home-brand);
  font-size: 14px;
}

.chat-avatar.teacher {
  background: #ecf7ef;
  color: #2b6b45;
}

.chat-bubble {
  max-width: 72%;
  padding: 11px 13px;
  border-radius: 4px 12px 12px 12px;
  background: #f4f5f4;
  color: #4d5952;
  font-size: 11px;
  line-height: 1.65;
}

.chat-line.mine .chat-bubble {
  border-radius: 12px 4px 12px 12px;
  background: #dcf5e3;
  color: #27553a;
}

.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.suggestions span {
  padding: 7px 9px;
  border: 1px solid #e1e6e3;
  border-radius: 7px;
  background: #ffffff;
  color: #778179;
  font-size: 9px;
}

.workspace-input {
  display: flex;
  min-height: 45px;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px 0 13px;
  border: 1px solid #e0e5e2;
  border-radius: 9px;
  color: #b0b6b2;
  font-size: 10px;
}

.workspace-input i {
  display: inline-flex;
  width: 28px;
  height: 28px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #f1f3f1;
  color: #849087;
  font-size: 15px;
}

.feature-wrap {
  position: relative;
  z-index: 2;
  margin-top: 24px;
}

.features {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  border: 0;
  background: transparent;
}

.features .feat {
  min-height: 156px;
  padding: 25px 24px;
  border: 1px solid var(--home-line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.96);
}

.feat-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 13px;
}

.features .feat .fi,
.feature-icon {
  display: inline-flex;
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  align-items: center;
  justify-content: center;
  margin: 0;
  border-radius: 50%;
  background: var(--home-brand-soft);
  color: var(--home-brand);
  font-size: 21px;
}

.features .feat h3 {
  margin: 0;
  font-size: 15px;
}

.features .feat p {
  font-size: 12px;
  line-height: 1.75;
}

.steps {
  padding: 38px 0 30px;
  border-top: 1px solid #f0f3f1;
  background: #ffffff;
}

.section-heading {
  margin-bottom: 22px;
  text-align: center;
}

.section-heading .section-kicker {
  display: inline-flex;
  margin-bottom: 8px;
  color: var(--home-brand-deep);
  font-size: 12px;
  font-weight: 700;
}

.section-heading h2,
.steps h2,
.pf h2 {
  margin: 0;
  color: var(--home-ink);
  font-size: 26px;
  font-weight: 750;
}

.steps-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 26px minmax(0, 1fr) 26px minmax(0, 1fr);
  gap: 12px;
  max-width: none;
}

.step {
  position: relative;
  display: grid;
  min-width: 0;
  min-height: 104px;
  grid-template-columns: 42px minmax(0, 1fr) 42px;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--home-line);
  border-radius: 13px;
  background: #ffffff;
  box-shadow: 0 10px 30px rgba(30, 64, 43, 0.035);
}

.step-arrow {
  align-self: center;
  justify-self: center;
  color: #aebbb2;
  font-size: 22px;
}

.step .sn {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  margin: 0;
  border: 1px solid #8cd8aa;
  border-radius: 50%;
  color: var(--home-brand-deep);
  font-size: 11px;
  letter-spacing: 0;
}

.step-copy h4 {
  margin: 0 0 6px;
  font-size: 14px;
}

.step-copy p {
  margin: 0;
  color: #66736b;
  font-size: 12px;
  line-height: 1.6;
}

.step-icon {
  color: var(--home-brand);
  font-size: 31px;
}

.stats {
  padding: 0 0 34px;
}

.stats-row {
  display: grid;
  max-width: none;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  padding: 27px 22px;
  border: 1px solid #e7efea;
  border-radius: 14px;
  background: var(--home-brand-pale);
}

.stat {
  position: relative;
}

.stat:not(:last-child)::after {
  position: absolute;
  top: 8px;
  right: 0;
  width: 1px;
  height: 42px;
  background: #dfe8e2;
  content: "";
}

.stat .n {
  color: #101612;
  font-size: 28px;
}

.stat .l {
  color: #66736b;
  font-size: 12px;
}

.pf {
  padding: 12px 0 48px;
}

.experience-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.38fr) minmax(0, 0.62fr);
  align-items: center;
  gap: 40px;
}

.pf-copy {
  min-width: 0;
}

.pf-copy .cap {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--home-brand-soft);
  color: var(--home-brand-deep);
  font-size: 12px;
}

.pf-copy h3 {
  max-width: 360px;
  margin: 0 0 18px;
  color: var(--home-ink);
  font-size: 30px;
  line-height: 1.35;
}

.pf-copy p {
  max-width: 360px;
  margin: 0 0 19px;
  color: #6d7971;
  font-size: 13px;
  line-height: 1.8;
}

.experience-points {
  display: grid;
  gap: 9px;
  margin-bottom: 26px;
}

.experience-points span {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #5f6d64;
  font-size: 13px;
}

.experience-points i {
  color: var(--home-brand);
}

.workspace-frame.large .workspace-window {
  min-height: 360px;
  grid-template-columns: 126px 172px minmax(0, 1fr);
}

.conversation-list {
  padding: 18px 12px;
  border-right: 1px solid #eef2ef;
  background: #ffffff;
}

.conversation-list h4 {
  margin: 0 0 14px;
  font-size: 12px;
}

.conversation-search {
  display: flex;
  height: 30px;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
  padding: 0 9px;
  border-radius: 7px;
  background: #f4f5f4;
  color: #a0a8a3;
  font-size: 9px;
}

.conversation-item {
  padding: 10px 8px;
  border-radius: 8px;
  color: #5e6962;
  font-size: 10px;
  line-height: 1.45;
}

.conversation-item.active {
  background: #eef8f1;
  color: #2e523d;
}

.conversation-item time {
  display: block;
  margin-top: 4px;
  color: #a3aba6;
  font-size: 8px;
}

footer {
  padding: 38px 0 20px;
  border-top: 0;
  background: var(--home-footer);
}

footer .fgrid {
  display: grid;
  grid-template-columns: 1.55fr repeat(3, 0.7fr) 1fr;
  gap: 44px;
}

.footer-logo {
  width: 126px;
  height: 36px;
  margin-bottom: 14px;
  padding: 5px 8px;
  border-radius: 5px;
  background: #ffffff;
  object-fit: contain;
  object-position: left center;
}

footer .fbrand + p,
footer .fcol p {
  max-width: 260px;
  color: #a9bbb1;
  font-size: 12px;
  line-height: 1.8;
}

footer .fcol h5 {
  margin-bottom: 13px;
  color: #ffffff;
  font-size: 13px;
}

footer .fcol div,
footer .fcol div a {
  color: #a9bbb1;
  font-size: 12px;
  line-height: 2.1;
  text-decoration: none;
}

footer .fcol div a:hover {
  color: #ffffff;
}

.footer-follow {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-qr {
  display: inline-flex;
  width: 54px;
  height: 54px;
  flex: 0 0 54px;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: #ffffff;
  color: #14241b;
  font-size: 42px;
}

.footer-follow span {
  color: #c2cec7;
  font-size: 11px;
  line-height: 1.65;
}

footer .copyright {
  display: flex;
  justify-content: center;
  gap: 18px;
  margin-top: 34px;
  padding-top: 21px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #7f9689;
}

.login-dialog {
  border: 1px solid #e3ebe5;
  border-radius: 18px;
}

.login-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

@media (max-width: 1060px) {
  .hero-layout {
    grid-template-columns: minmax(0, 0.92fr) minmax(440px, 1.08fr);
    gap: 30px;
  }

  .workspace-window {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .workspace-side {
    padding: 15px 11px;
  }

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

  footer .fgrid {
    grid-template-columns: 1.4fr repeat(2, 0.8fr) 1fr;
  }

  footer .fcol:nth-child(4) {
    display: none;
  }
}

@media (max-width: 860px) {
  .navlinks {
    display: none;
  }

  .burger {
    display: inline-flex;
  }

  .hero-shell {
    padding-top: 36px;
  }

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

  .hero-copy {
    padding-top: 12px;
  }

  .hero-copy h1 {
    max-width: 680px;
    font-size: 48px;
  }

  .workspace-frame:not(.large) {
    max-width: 660px;
  }

  .steps-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .step {
    grid-template-columns: 36px minmax(0, 1fr);
  }

  .step-icon,
  .step-arrow {
    display: none;
  }

  .experience-grid {
    gap: 30px;
  }

  .pf-copy h3,
  .pf-copy p {
    max-width: 620px;
  }
}

@media (max-width: 680px) {
  .wrap {
    width: min(100% - 32px, 1280px);
  }

  .nav {
    min-height: 64px;
  }

  .wordmark {
    width: 108px;
  }

  .nav-actions > .btn {
    display: none;
  }

  .user-chip {
    display: inline-flex;
  }

  .hero-shell {
    padding: 30px 0 26px;
  }

  .hero-copy h1 {
    font-size: 38px;
    letter-spacing: -0.04em;
  }

  .hero-copy > p {
    font-size: 14px;
  }

  .hero-actions .btn {
    flex: 1;
    min-width: 140px;
  }

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

  .plat-badge {
    justify-content: center;
    padding: 0 8px;
  }

  .workspace-window {
    min-height: 360px;
    grid-template-columns: 92px minmax(0, 1fr);
  }

  .workspace-mini-logo {
    width: 66px;
  }

  .workspace-nav span {
    padding: 0 7px;
    font-size: 0;
  }

  .workspace-nav span i {
    font-size: 15px;
  }

  .workspace-group {
    display: none;
  }

  .workspace-main {
    padding: 14px 12px 12px;
  }

  .chat-bubble {
    max-width: 84%;
    font-size: 10px;
  }

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

  .features .feat {
    min-height: 0;
  }

  .steps {
    padding-top: 44px;
  }

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

  .step {
    min-height: 96px;
  }

  .stats-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 28px;
  }

  .stat:nth-child(2)::after {
    display: none;
  }

  .stat .n {
    font-size: 24px;
  }

  .workspace-frame.large .workspace-window {
    min-height: 360px;
    grid-template-columns: 92px minmax(0, 1fr);
  }

  .workspace-frame.large .conversation-list {
    display: none;
  }

  footer .fgrid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
  }

  footer .fcol:first-child,
  footer .fcol:last-child {
    grid-column: 1 / -1;
  }

  footer .copyright {
    flex-direction: column;
    gap: 6px;
  }
}

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

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