:root {
  --bg: #f4f7ef;
  --surface: #ffffff;
  --surface-soft: #f8fbf3;
  --text: #17212b;
  --muted: #4b5e6e;
  --brand: #0e8b58;
  --brand-strong: #066c45;
  --accent: #ff8a3d;
  --line: #d7e2d4;
  --radius-lg: 22px;
  --radius-md: 14px;
  --shadow-lg: 0 18px 50px rgba(7, 58, 40, 0.12);
  --shadow-md: 0 10px 26px rgba(7, 58, 40, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Outfit", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at 10% 10%, rgba(255, 201, 131, 0.26), transparent 35%),
              radial-gradient(circle at 80% 0%, rgba(117, 230, 171, 0.24), transparent 30%),
              var(--bg);
  line-height: 1.5;
  position: relative;
  overflow-x: hidden;
}

.bg-glow {
  position: fixed;
  width: 360px;
  height: 360px;
  border-radius: 999px;
  filter: blur(90px);
  pointer-events: none;
  opacity: 0.42;
  z-index: -1;
}

.bg-glow-left {
  left: -120px;
  top: -80px;
  background: #ffc773;
}

.bg-glow-right {
  right: -140px;
  bottom: -120px;
  background: #4ade80;
}

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

.section {
  padding: 84px 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 12;
  backdrop-filter: blur(12px);
  background: rgba(244, 247, 239, 0.84);
  border-bottom: 1px solid rgba(215, 226, 212, 0.7);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.brand img {
  width: 42px;
  height: 42px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 18px;
}

.main-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.main-nav a:hover,
.main-nav a.is-active {
  color: var(--brand-strong);
  border-bottom-color: var(--brand);
}

.menu-toggle {
  display: none;
  border: none;
  background: transparent;
  padding: 6px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
}

.hero {
  padding-top: 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 30px;
  align-items: center;
}

.kicker {
  margin: 0;
  color: var(--brand-strong);
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.hero h1 {
  margin: 12px 0 18px;
  font-size: clamp(2rem, 4.2vw, 3.4rem);
  line-height: 1.15;
  font-weight: 800;
}

.lead {
  margin: 0;
  color: var(--muted);
  max-width: 62ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 10px 18px;
  font-weight: 600;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  border-color: var(--line);
  color: var(--text);
  background: #fff;
}

.hero-tags {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-tags li {
  padding: 6px 11px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-panel {
  background: linear-gradient(170deg, #ffffff 0%, #f0f8ec 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

.hero-panel h2 {
  margin: 0;
  font-size: 1.3rem;
}

.stat-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.stat-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}

.stat-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.stat-grid strong {
  display: block;
  margin-top: 6px;
  font-size: 1.6rem;
  color: var(--brand-strong);
}

.panel-foot {
  margin: 14px 0 0;
  color: #667b86;
  font-size: 0.85rem;
}

.section-head p {
  margin: 0;
  color: var(--brand-strong);
  font-size: 0.9rem;
  font-weight: 700;
}

.section-head h2 {
  margin: 8px 0 0;
  max-width: 28ch;
  line-height: 1.2;
  font-size: clamp(1.6rem, 3vw, 2.5rem);
}

.feature-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-md);
}

.feature-card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.feature-card p {
  margin: 8px 0 0;
  color: var(--muted);
}

#scenarios {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.5), rgba(240, 248, 236, 0.9));
}

.scene-tabs {
  margin-top: 24px;
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 4px;
}

.scene-tab {
  border: none;
  border-radius: 999px;
  padding: 9px 16px;
  background: transparent;
  font-family: inherit;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
}

.scene-tab.is-active {
  background: var(--brand);
  color: #fff;
}

.scene-panels {
  margin-top: 18px;
  position: relative;
  min-height: 188px;
}

.scene-panel {
  display: none;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  animation: rise 0.28s ease;
}

.scene-panel.is-active {
  display: block;
}

.scene-panel h3 {
  margin: 0;
}

.scene-panel ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.scene-panel li + li {
  margin-top: 8px;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.timeline {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.timeline article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
}

.timeline span {
  color: var(--brand-strong);
  font-size: 0.8rem;
  font-weight: 700;
}

.timeline h3 {
  margin: 8px 0;
  font-size: 1.08rem;
}

.timeline p {
  margin: 0;
  color: var(--muted);
}

.experience-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.experience-box {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-md);
}

.section-head.compact h2 {
  max-width: none;
  font-size: 1.8rem;
}

.word-card {
  margin: 10px 0 16px;
  border: 1px dashed #bdd7b0;
  border-radius: 12px;
  background: var(--surface-soft);
  padding: 16px;
}

.word-card h3 {
  margin: 0;
  font-size: 1.9rem;
}

.word-card p {
  margin: 8px 0 0;
  color: var(--muted);
}

.quotes-box blockquote {
  margin: 8px 0 0;
  font-size: 1.14rem;
  line-height: 1.6;
  color: var(--text);
}

.quotes-box p {
  margin-top: 12px;
  color: var(--muted);
}

.quote-dots {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}

.quote-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: #c6d3c0;
  padding: 0;
  cursor: pointer;
}

.quote-dots button.is-active {
  background: var(--brand-strong);
}

.section-download {
  background: linear-gradient(130deg, #fff8ea 0%, #eef8f0 45%, #f8fbf3 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.download-wrap {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  align-items: start;
}

.download-wrap h2 {
  margin: 8px 0 0;
  font-size: clamp(1.7rem, 2.8vw, 2.5rem);
}

.download-wrap ul {
  margin: 14px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.download-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-md);
}

.download-card h3 {
  margin-top: 0;
}

.download-card ol {
  margin: 8px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.site-footer {
  padding: 24px 0;
  background: #f0f5ed;
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-wrap p {
  margin: 0;
}

@media (max-width: 980px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .download-wrap {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .section {
    padding: 62px 0;
  }

  .menu-toggle {
    display: inline-block;
  }

  .main-nav {
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 74px;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow-md);
    padding: 8px;
  }

  .main-nav.is-open {
    display: flex;
  }

  .main-nav a {
    width: 100%;
    padding: 10px;
    border-bottom: none;
  }

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

  .scene-tabs {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-radius: 12px;
  }

  .scene-tab {
    border-radius: 8px;
    padding: 9px 8px;
    font-size: 0.92rem;
  }

  .footer-wrap {
    flex-direction: column;
  }
}