:root {
  --floard-primary: #292524;
  --floard-primary-active: #0c0a09;
  --floard-ink: #0c0a09;
  --floard-body: #4e4e4e;
  --floard-body-strong: #292524;
  --floard-muted: #777169;
  --floard-muted-soft: #a8a29e;
  --floard-hairline: #e7e5e4;
  --floard-hairline-soft: #f0efed;
  --floard-hairline-strong: #d6d3d1;
  --floard-canvas: #f5f5f5;
  --floard-canvas-soft: #fafafa;
  --floard-canvas-deep: #0c0a09;
  --floard-surface-card: #ffffff;
  --floard-surface-strong: #f0efed;
  --floard-surface-dark: #0c0a09;
  --floard-surface-dark-elevated: #1c1917;
  --floard-on-primary: #ffffff;
  --floard-on-dark: #ffffff;
  --floard-on-dark-soft: #a8a29e;
  --floard-gradient-mint: #a7e5d3;
  --floard-gradient-peach: #f4c5a8;
  --floard-gradient-lavender: #c8b8e0;
  --floard-gradient-sky: #a8c8e8;
  --floard-gradient-rose: #e8b8c4;
  --floard-display-font: "Waldenburg", "Times New Roman", serif;
  --floard-body-font: "Inter", "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--floard-ink);
  background: var(--floard-canvas);
  font-family: var(--floard-body-font);
  line-height: 1.65;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--floard-ink);
  background: var(--floard-canvas);
}

a {
  color: inherit;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--floard-primary-active);
}

a:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(41, 37, 36, 0.42);
  outline-offset: 3px;
}

.shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  padding: 1rem 0 0;
  border-bottom: 0;
  background: transparent;
}

.floating-header {
  pointer-events: none;
}

.header-content,
.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
}

.floating-nav {
  pointer-events: auto;
  min-height: 4.9rem;
  padding: 0.8rem 1rem;
  border: 1px solid rgba(214, 211, 209, 0.78);
  border-radius: 1.8rem;
  background: rgba(250, 250, 250, 0.9);
  box-shadow: 0 22px 70px rgba(41, 37, 36, 0.12);
  backdrop-filter: blur(18px);
}

.brand,
.site-header nav,
.site-footer nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  color: var(--floard-ink);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: block;
  width: 2.45rem;
  height: 2.45rem;
  border-radius: 28%;
  object-fit: cover;
  box-shadow: 0 8px 18px rgba(41, 37, 36, 0.14);
}

.site-header nav a,
.site-footer nav a {
  color: var(--floard-muted);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
}

.site-header nav {
  margin-left: auto;
}

.button {
  display: inline-block;
  padding: 0.68rem 1rem;
  border-radius: 0.6rem;
  background: var(--floard-ink);
  color: var(--floard-on-primary);
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  background: var(--floard-primary-active);
  color: var(--floard-on-primary);
}

.button-secondary {
  border: 1px solid var(--floard-hairline-strong);
  background: transparent;
  color: var(--floard-primary);
}

.button-secondary:hover {
  border-color: var(--floard-primary);
  background: var(--floard-surface-strong);
  color: var(--floard-primary-active);
}

.button-small {
  padding: 0.45rem 0.75rem;
  font-size: 0.9rem;
}

.nav-cta {
  margin-left: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  background: var(--floard-primary);
  box-shadow: 0 10px 24px rgba(41, 37, 36, 0.2);
  font-weight: 750;
}

main {
  padding: 1.25rem 0 4rem;
}

.article-content article {
  max-width: 720px;
  margin: 0 auto;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.page-hero {
  padding: clamp(1.5rem, 5vw, 4rem);
  border-radius: 1.25rem;
  background: var(--floard-surface-strong);
}

.article-content .page-hero {
  padding: 0;
  background: transparent;
}

.home-main {
  width: min(1260px, calc(100% - 1.5rem));
}

.home-hero {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-template-rows: minmax(24rem, auto) minmax(14rem, auto) minmax(9rem, auto);
  gap: 0;
  min-height: min(820px, calc(100vh - 5.5rem));
  padding: clamp(2rem, 5vw, 4.8rem);
  overflow: hidden;
  border: 1px solid rgba(214, 211, 209, 0.72);
  border-radius: 2.4rem;
  background:
    linear-gradient(rgba(41, 37, 36, 0.08) 1px, transparent 1px), linear-gradient(90deg, rgba(41, 37, 36, 0.08) 1px, transparent 1px),
    radial-gradient(circle at 68% 8%, rgba(167, 229, 211, 0.28), transparent 28%),
    radial-gradient(circle at 8% 82%, rgba(244, 197, 168, 0.24), transparent 30%),
    radial-gradient(circle at 88% 78%, rgba(200, 184, 224, 0.18), transparent 32%), var(--floard-canvas);
  background-size:
    clamp(12rem, 18vw, 16.5rem) clamp(10rem, 18vw, 15rem),
    clamp(12rem, 18vw, 16.5rem) clamp(10rem, 18vw, 15rem),
    100% 100%,
    100% 100%,
    100% 100%;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.7),
    0 28px 90px rgba(41, 37, 36, 0.08);
}

.home-hero::before,
.home-hero::after {
  position: absolute;
  width: 0.5rem;
  height: 0.5rem;
  background: rgba(41, 37, 36, 0.18);
  content: "";
}

.home-hero::before {
  top: 1.5rem;
  left: 1.5rem;
}

.home-hero::after {
  top: 1.5rem;
  right: 1.5rem;
}

.hero-copy {
  z-index: 2;
  grid-column: 1 / span 5;
  grid-row: 1;
  align-self: start;
  max-width: 34rem;
  padding-top: clamp(0.75rem, 3vw, 2.2rem);
  text-align: left;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.hero-visual {
  position: relative;
  z-index: 1;
  grid-column: 7 / -1;
  grid-row: 1 / span 2;
  align-self: center;
  justify-self: end;
  width: min(100%, 680px);
  margin: 0;
}

.hero-mockup {
  display: block;
  width: 100%;
  border-radius: 1.4rem;
  filter: saturate(0.96);
  box-shadow: 0 28px 80px rgba(41, 37, 36, 0.22);
}

.hero-assistant {
  position: absolute;
  width: clamp(4.1rem, 7vw, 6.3rem);
  border: 1px solid rgba(41, 37, 36, 0.16);
  border-radius: 1rem;
  box-shadow: 0 20px 48px rgba(41, 37, 36, 0.18);
}

.hero-assistant-idle {
  top: 17%;
  right: 16%;
}

.hero-assistant-thinking {
  bottom: 10%;
  left: -4%;
}

.grid-callout {
  position: absolute;
  z-index: 2;
  max-width: 15rem;
  color: var(--floard-ink);
  letter-spacing: -0.04em;
  line-height: 1;
}

.grid-callout a {
  color: var(--floard-ink);
  font-size: clamp(1.7rem, 2.7vw, 2.55rem);
  font-weight: 500;
  text-decoration-color: var(--floard-primary);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.08em;
}

.grid-callout span {
  display: block;
  margin-top: 0.42rem;
  color: var(--floard-muted);
  font-size: clamp(1rem, 1.5vw, 1.28rem);
  letter-spacing: -0.04em;
  line-height: 1.04;
}

.grid-callout-notes {
  top: 48%;
  left: 21%;
}

.grid-callout-canvas {
  top: 25%;
  right: 2.5%;
}

.grid-callout-teacher {
  bottom: 20%;
  left: 52%;
}

.grid-callout-review {
  right: 24%;
  bottom: 3%;
}

.demo-section {
  display: grid;
  justify-items: center;
  margin-top: clamp(2rem, 5vw, 3.25rem);
}

.demo-section .demo-panel {
  width: min(100%, 900px);
}

.demo-panel {
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid var(--floard-hairline);
  border-radius: 1.5rem;
  background: var(--floard-canvas-soft);
  color: var(--floard-ink);
  box-shadow: 0 16px 40px rgba(41, 37, 36, 0.08);
}

.demo-panel h2 {
  margin: 0 0 1rem;
  color: var(--floard-ink);
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}

.demo-panel .eyebrow,
.demo-caption {
  color: var(--floard-muted);
}

.demo-panel video,
.video-placeholder {
  width: 100%;
  min-height: 18rem;
  border: 1px solid var(--floard-hairline);
  border-radius: 1rem;
  background: var(--floard-surface-card);
}

.demo-panel video {
  display: block;
}

.video-placeholder {
  display: grid;
  gap: 1rem;
  align-content: center;
  padding: 1.25rem;
}

.video-poster {
  display: block;
  width: 100%;
  border-radius: 0.85rem;
  background: var(--floard-surface-strong);
}

.poster-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0.6rem;
  align-items: center;
}

.poster-flow span {
  display: grid;
  min-height: 5.5rem;
  place-items: center;
  border: 1px solid var(--floard-hairline);
  border-radius: 1rem;
  background: var(--floard-canvas);
  text-align: center;
  font-weight: 800;
}

.poster-flow strong {
  color: var(--floard-primary);
}

.video-placeholder p,
.demo-caption {
  margin-bottom: 0;
}

.home-section {
  margin-top: clamp(3rem, 7vw, 5rem);
}

.product-band {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(1.25rem, 4vw, 3rem);
  align-items: center;
  margin-top: clamp(3rem, 7vw, 5.5rem);
  padding: clamp(1.25rem, 4vw, 3rem);
  border: 1px solid var(--floard-hairline);
  border-radius: 2rem;
  background: var(--floard-surface-card);
  box-shadow: 0 18px 60px rgba(41, 37, 36, 0.06);
}

.product-band-reverse .product-band-copy {
  order: 2;
}

.product-band-copy h2 {
  margin-top: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.product-band-copy p:last-child {
  color: var(--floard-body);
  font-size: 1.08rem;
}

.product-band-media {
  margin: 0;
}

.product-band-media img {
  display: block;
  width: 100%;
  max-height: 28rem;
  border-radius: 1.5rem;
  object-fit: cover;
  background: var(--floard-surface-strong);
}

.workflow-grid,
.use-case-grid {
  display: grid;
  gap: 1rem;
}

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

.workflow-card,
.use-case {
  border: 1px solid var(--floard-hairline);
  border-radius: 1.25rem;
  background: var(--floard-surface-card);
}

.workflow-card {
  padding: 1.4rem;
}

.step-number {
  display: inline-grid;
  width: 2.4rem;
  height: 2.4rem;
  margin-bottom: 1rem;
  place-items: center;
  border-radius: 50%;
  background: var(--floard-gradient-mint);
  color: var(--floard-primary);
  font-weight: 900;
}

.use-case-grid {
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.use-case {
  padding: 1rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--floard-muted);
  font-size: 0.9rem;
  font-weight: 750;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

h1,
h2,
.testimonials-heading h2,
.faq-heading-block h2 {
  font-family: var(--floard-display-font);
  font-weight: 300;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
}

.home-hero h1 {
  max-width: 11ch;
  color: var(--floard-ink);
  font-size: clamp(3.7rem, 8vw, 7.6rem);
  font-weight: 300;
  letter-spacing: -0.08em;
  line-height: 0.95;
}

h2 {
  margin-top: 3.25rem;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
}

h3 {
  margin-top: 0;
}

.intro {
  max-width: 48rem;
  font-size: 1.15rem;
}

.home-hero .intro {
  max-width: 29rem;
  margin: 1.6rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(41, 37, 36, 0.12);
  color: var(--floard-body);
  font-size: clamp(1.05rem, 1.45vw, 1.28rem);
  letter-spacing: -0.04em;
  line-height: 1.18;
}

.article-dates {
  color: var(--floard-body);
  font-size: 0.9rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  padding: 1.25rem;
  border: 1px solid var(--floard-hairline);
  border-radius: 1rem;
  background: var(--floard-surface-card);
}

.card:nth-child(3n + 1) {
  background: rgba(167, 229, 211, 0.34);
}

.card:nth-child(3n + 2) {
  background: rgba(244, 197, 168, 0.34);
}

.card:nth-child(3n) {
  background: rgba(200, 184, 224, 0.32);
}

.testimonials-section {
  margin-top: clamp(4rem, 8vw, 7rem);
  overflow: hidden;
}

.testimonials-heading {
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
  text-align: center;
}

.testimonials-heading h2 {
  margin: 0;
  color: var(--floard-ink);
  font-size: clamp(3.2rem, 7.8vw, 7.4rem);
  font-weight: 300;
  letter-spacing: -0.08em;
  line-height: 0.95;
}

.testimonials-heading p {
  max-width: 42rem;
  margin: 1rem auto 0;
  color: var(--floard-muted);
  font-size: 1rem;
}

.testimonials-track {
  display: flex;
  gap: 1.25rem;
  margin-inline: calc(-1 * clamp(0rem, 4vw, 2rem));
  padding: 0 clamp(0rem, 4vw, 2rem) 0.5rem;
  overflow-x: auto;
  scroll-padding-inline: 1rem;
  scroll-snap-type: x proximity;
  scrollbar-width: none;
}

.testimonials-track::-webkit-scrollbar {
  display: none;
}

.testimonial-card {
  display: flex;
  flex: 0 0 clamp(20rem, 33vw, 26rem);
  min-height: 28rem;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(1.5rem, 3vw, 2rem);
  border: 1px solid rgba(214, 211, 209, 0.78);
  border-radius: 1.35rem;
  background: var(--floard-surface-card);
  box-shadow: 0 18px 52px rgba(41, 37, 36, 0.06);
  scroll-snap-align: center;
}

.testimonial-card header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.85rem;
  align-items: center;
}

.testimonial-avatar,
.testimonial-source {
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
}

.testimonial-avatar {
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, var(--floard-gradient-mint), var(--floard-gradient-lavender));
  box-shadow: inset 0 0 0 2px rgba(41, 37, 36, 0.08);
  color: var(--floard-ink);
  font-weight: 850;
}

.testimonial-source {
  width: 2.7rem;
  height: 2.7rem;
  border: 1px solid rgba(214, 211, 209, 0.78);
  color: var(--floard-muted);
  font-weight: 850;
}

.testimonial-card strong {
  display: block;
  color: var(--floard-ink);
  font-size: 1.05rem;
  line-height: 1.1;
}

.testimonial-card small {
  display: block;
  margin-top: 0.15rem;
  color: var(--floard-muted);
  font-size: 0.94rem;
  line-height: 1.25;
}

.testimonial-card blockquote {
  margin: clamp(2rem, 4vw, 3rem) 0;
  color: var(--floard-primary);
  font-size: clamp(1.55rem, 2.4vw, 2.25rem);
  letter-spacing: -0.055em;
  line-height: 1.42;
}

.testimonial-card footer {
  padding-top: 1.1rem;
  border-top: 1px solid rgba(214, 211, 209, 0.78);
  color: var(--floard-muted);
  font-size: 0.96rem;
  font-weight: 700;
}

.faq:not(.faq-split) details {
  padding: 1rem;
  border-bottom: 1px solid var(--floard-hairline);
  background: var(--floard-surface-card);
}

.faq:not(.faq-split) summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-split {
  display: grid;
  grid-template-columns: minmax(16rem, 0.85fr) minmax(0, 1.35fr);
  gap: clamp(2rem, 7vw, 5rem);
  margin-top: clamp(4rem, 8vw, 7rem);
  padding-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid rgba(41, 37, 36, 0.12);
}

.faq-heading-block {
  position: sticky;
  top: 7rem;
  align-self: start;
}

.faq-heading-block h2 {
  display: grid;
  margin: 0;
  color: var(--floard-ink);
  font-size: clamp(4rem, 8vw, 7.2rem);
  font-weight: 300;
  letter-spacing: -0.085em;
  line-height: 0.98;
}

.faq-list {
  border-top: 1px solid rgba(41, 37, 36, 0.11);
}

.faq-split details {
  border-bottom: 1px solid rgba(41, 37, 36, 0.11);
}

.faq-split summary {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.9rem 0;
  cursor: pointer;
  color: var(--floard-ink);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  font-weight: 650;
  letter-spacing: -0.045em;
  line-height: 1.2;
  list-style: none;
}

.faq-split summary::-webkit-details-marker {
  display: none;
}

.faq-toggle {
  display: inline-grid;
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid rgba(214, 211, 209, 0.9);
  border-radius: 999px;
  color: var(--floard-muted);
  font-size: 1.65rem;
  font-weight: 450;
}

.faq-toggle::before {
  content: "+";
}

.faq-split details[open] .faq-toggle {
  border-color: var(--floard-primary);
  background: var(--floard-primary);
  color: var(--floard-on-primary);
}

.faq-split details[open] .faq-toggle::before {
  content: "×";
}

.faq-split details[open] p {
  max-width: 44rem;
  margin: -0.4rem 0 2rem;
  padding-left: 1.5rem;
  border-left: 3px solid var(--floard-gradient-lavender);
  color: var(--floard-muted);
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  line-height: 1.65;
}

.sources,
.related {
  margin-top: 3rem;
}

.site-footer {
  border-top: 1px solid var(--floard-hairline);
  background: var(--floard-surface-card);
  color: var(--floard-body);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .home-hero,
  .product-band,
  .workflow-grid {
    grid-template-columns: 1fr;
  }

  .home-hero {
    grid-template-rows: auto;
    min-height: 0;
    gap: 1rem;
    padding: clamp(1.25rem, 5vw, 2rem);
  }

  .hero-copy,
  .hero-visual,
  .grid-callout {
    grid-column: 1;
    grid-row: auto;
  }

  .home-hero h1 {
    max-width: 10ch;
    font-size: clamp(3rem, 14vw, 5rem);
  }

  .hero-visual {
    justify-self: center;
    width: 100%;
    margin: 1rem 0;
  }

  .grid-callout {
    position: static;
    max-width: none;
    padding-top: 1rem;
    border-top: 1px solid rgba(41, 37, 36, 0.1);
  }

  .hero-assistant {
    width: 4.25rem;
  }

  .hero-assistant-idle {
    top: 10%;
    right: 5%;
  }

  .hero-assistant-thinking {
    bottom: 5%;
    left: 2%;
  }

  .product-band-reverse .product-band-copy {
    order: 0;
  }

  .testimonials-heading {
    text-align: left;
  }

  .testimonials-heading h2 {
    font-size: clamp(3.1rem, 13vw, 5rem);
  }

  .testimonials-track {
    margin-inline: 0;
    padding-inline: 0;
  }

  .testimonial-card {
    flex-basis: min(86vw, 23rem);
    min-height: 24rem;
  }

  .faq-split {
    grid-template-columns: 1fr;
  }

  .faq-heading-block {
    position: static;
  }

  .faq-heading-block h2 {
    font-size: clamp(3.2rem, 15vw, 5.4rem);
  }

  .poster-flow {
    grid-template-columns: 1fr;
  }

  .poster-flow strong {
    transform: rotate(90deg);
  }

  .header-content,
  .footer-content {
    align-items: flex-start;
    flex-direction: column;
    padding: 1rem 0;
  }

  .floating-nav {
    align-items: stretch;
    padding: 0.85rem;
    border-radius: 1.25rem;
  }

  .site-header nav {
    flex-wrap: wrap;
    margin-left: 0;
    gap: 0.8rem;
  }

  .site-header .nav-cta {
    align-self: stretch;
    text-align: center;
  }

  .site-footer nav {
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}