:root {
  --bg: #eaf7f0;
  --bg-sky: #eaf6ff;
  --bg-peach: #fff5f2;
  --surface: rgba(255, 255, 255, 0.84);
  --surface-strong: #ffffff;
  --line: rgba(43, 36, 30, 0.08);
  --text-strong: #2b241e;
  --text-body: #4c4037;
  --text-soft: #7a6b5f;
  --primary: #47b66a;
  --primary-pressed: #69cf8a;
  --primary-soft: #cff3d9;
  --learn: #57bfea;
  --learn-soft: #eaf7ff;
  --cards: #ff8e7a;
  --cards-soft: #ffe9e4;
  --explore: #47b66a;
  --gold: #ffb84d;
  --shadow: 0 18px 60px rgba(43, 36, 30, 0.1);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text-body);
  background:
    radial-gradient(circle at top left, rgba(71, 182, 106, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(87, 191, 234, 0.18), transparent 26%),
    linear-gradient(180deg, #fcfffe 0%, var(--bg) 62%, var(--bg-sky) 100%);
  font-family: ui-rounded, "SF Pro Rounded", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-shell {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
  padding: 24px 0 36px;
}

.topbar,
.footer,
.hero,
.support-layout,
.feature-gallery,
.spotlight {
  gap: 20px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--text-strong);
  text-decoration: none;
}

.brand-icon {
  width: 54px;
  height: 54px;
  border-radius: 18px;
  box-shadow: 0 10px 22px rgba(42, 120, 110, 0.16);
}

.brand strong,
.brand span {
  display: block;
}

.brand strong {
  font-size: 1.02rem;
}

.brand span {
  color: var(--text-soft);
  font-size: 0.88rem;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.topnav a {
  color: var(--text-body);
  font-weight: 600;
}

.topnav a[aria-current="page"] {
  color: var(--primary);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  align-items: center;
  gap: 34px;
  margin-bottom: 26px;
}

.hero-copy,
.page-hero,
.card {
  backdrop-filter: blur(14px);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 22px;
  max-width: 640px;
  padding: 26px 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1,
h2,
h3,
summary {
  color: var(--text-strong);
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 3.45vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  white-space: normal;
  text-wrap: balance;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.35rem, 2vw, 1.9rem);
  line-height: 1.2;
}

.hero-text,
.page-hero p,
.card p,
.legal-card li {
  font-size: 1.05rem;
}

.hero-text {
  margin: 0;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 8px 0 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.button:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.button-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 14px 28px rgba(71, 182, 106, 0.24);
}

.button-primary:hover {
  background: var(--primary-pressed);
}

.button-disabled {
  cursor: default;
  box-shadow: none;
  opacity: 0.9;
}

.button-secondary {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  color: var(--text-strong);
}

.launch-note {
  margin: -6px 0 0;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration {
  display: block;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  filter: drop-shadow(0 20px 40px rgba(43, 36, 30, 0.14));
}

.feature-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 26px 0;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 18px;
}

.card.feature-visual-card {
  display: flex;
  flex-direction: column;
  padding: 10px;
  overflow: hidden;
}

.feature-image {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: 20px;
  padding: 0;
  background: var(--surface-strong);
  margin-bottom: 8px;
  transform: scale(1.06);
  transform-origin: center;
}

.feature-copy {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 8px 18px 16px;
}

.feature-copy h2 {
  margin-bottom: 10px;
}

.feature-copy p {
  margin: 0;
}

.preview-section {
  margin: 26px 0;
  padding: 0;
  background: transparent;
  border: 0;
  box-shadow: none;
  backdrop-filter: none;
}

.preview-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.preview-card {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(240px, 0.55fr);
  gap: 30px;
  align-items: center;
  padding: 32px 0;
  background: transparent;
  border-top: 1px solid rgba(43, 36, 30, 0.08);
}

.preview-card:first-child {
  padding-top: 0;
  border-top: 0;
}

.preview-card:last-child {
  padding-bottom: 0;
}

.preview-card img {
  display: block;
  width: 86%;
  height: auto;
  justify-self: center;
  border-radius: 24px;
  border: 0;
  box-shadow: 0 12px 26px rgba(43, 36, 30, 0.08);
}

.preview-card-reverse {
  grid-template-columns: minmax(240px, 0.55fr) minmax(0, 1.1fr);
}

.preview-copy {
  padding: 0 10px;
}

.preview-label {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.preview-label.learn {
  background: var(--learn-soft);
  color: var(--learn);
}

.preview-label.cards {
  background: var(--cards-soft);
  color: var(--cards);
}

.preview-label.explore {
  background: rgba(207, 243, 217, 0.8);
  color: var(--explore);
}

.preview-card h3 {
  margin: 0 0 8px;
  font-size: 1.24rem;
}

.preview-card p {
  margin: 0;
  color: var(--text-soft);
}

.card {
  padding: 28px;
  border-radius: var(--radius-xl);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.feature-chip {
  display: inline-flex;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.chip-learn {
  background: var(--learn-soft);
  color: var(--learn);
}

.chip-cards {
  background: var(--cards-soft);
  color: var(--cards);
}

.chip-explore {
  background: rgba(207, 243, 217, 0.8);
  color: var(--explore);
}

.clean-list {
  margin: 0;
  padding-left: 18px;
}

.clean-list li + li,
.legal-card section + section {
  margin-top: 10px;
}

.spotlight {
  display: block;
  margin-top: 28px;
}

.spotlight-copy {
  max-width: 700px;
}

.spotlight-copy p {
  max-width: 620px;
  margin: 0;
}

.spotlight-copy .button {
  margin-top: 18px;
}

.page-main {
  display: block;
}

.page-hero {
  margin-bottom: 24px;
  padding: 30px 32px;
  border-radius: 30px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(237, 249, 248, 0.94));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.support-layout {
  display: grid;
  grid-template-columns: minmax(280px, 320px) minmax(0, 1fr);
}

.contact-card {
  position: sticky;
  top: 22px;
  align-self: start;
}

.support-email {
  display: inline-block;
  margin: 10px 0 18px;
  font-size: 1.15rem;
  font-weight: 700;
}

.muted {
  color: var(--text-soft);
}

.faq-group {
  display: grid;
  gap: 20px;
}

.faq-card details {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.faq-card details:first-of-type {
  border-top: 0;
  padding-top: 6px;
}

summary {
  cursor: pointer;
  font-size: 1.02rem;
  font-weight: 700;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

details p {
  margin: 12px 0 0;
}

.quick-links .link-grid {
  display: grid;
  gap: 12px;
}

.quick-links a {
  display: block;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  color: var(--text-strong);
  font-weight: 700;
}

.legal-page {
  max-width: 920px;
  margin: 0 auto;
}

.legal-hero {
  text-align: left;
}

.legal-card section {
  margin-bottom: 24px;
}

.legal-card section:last-child {
  margin-bottom: 0;
}

.legal-card ul {
  margin: 12px 0 0;
  padding-left: 22px;
}

.footer {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  align-items: start;
  margin-top: 30px;
  padding: 24px 4px 0;
  border-top: 1px solid rgba(21, 53, 52, 0.08);
}

.footer p {
  margin: 6px 0 0;
  color: var(--text-soft);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

@media (max-width: 980px) {
  .hero,
  .support-layout,
  .feature-gallery,
  .footer {
    grid-template-columns: 1fr;
  }

  .spotlight {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-card {
    position: static;
  }

  .preview-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-shell {
    width: min(calc(100% - 20px), var(--max-width));
    padding-top: 14px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .topnav {
    gap: 12px;
  }

  .section-heading {
    flex-direction: column;
    align-items: flex-start;
  }

  .card,
  .page-hero {
    padding: 22px;
  }

  h1 {
    font-size: clamp(2.1rem, 12vw, 3.2rem);
  }

  .hero-text,
  .page-hero p,
  .card p,
  .legal-card li {
    font-size: 1rem;
  }

  .feature-image {
    aspect-ratio: 16 / 11;
  }
}