:root {
  --green-900: #0b3b2c;
  --green-800: #0f5a41;
  --green-700: #117453;
  --green-600: #1c8f5f;
  --green-500: #2bbf71;
  --green-400: #5fd79b;
  --green-300: #a5edc6;
  --green-200: #daf8e8;
  --lime-100: #f3ffe6;
  --ink-900: #0a231c;
  --ink-700: #28473b;
  --ink-600: #4b645b;
  --surface: #ffffff;
  --surface-alt: #f4fff8;
  --shadow: 0 20px 60px rgba(18, 75, 54, 0.12);
  --radius-lg: 24px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Source Sans 3", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink-900);
  background: linear-gradient(180deg, #f7fff9 0%, #ecfff1 40%, #ffffff 100%);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.background {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(0);
  opacity: 0.7;
  animation: float 16s ease-in-out infinite;
}

.orb-1 {
  width: 420px;
  height: 420px;
  top: -140px;
  left: -120px;
  background: radial-gradient(circle, #b9f4cf 0%, rgba(185, 244, 207, 0) 70%);
}

.orb-2 {
  width: 520px;
  height: 520px;
  bottom: -220px;
  right: -160px;
  animation-delay: -4s;
  background: radial-gradient(circle, #c2ffe1 0%, rgba(194, 255, 225, 0) 70%);
}

.orb-3 {
  width: 300px;
  height: 300px;
  top: 30%;
  right: 12%;
  animation-delay: -8s;
  background: radial-gradient(circle, #dfffe9 0%, rgba(223, 255, 233, 0) 70%);
}

.grain {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(9, 60, 44, 0.08) 1px, transparent 0);
  background-size: 3px 3px;
  opacity: 0.25;
  pointer-events: none;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(24px);
  }
}

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.section {
  padding: 96px 0;
}

.section.alt {
  background: var(--surface-alt);
}

.section-heading {
  display: grid;
  gap: 16px;
  margin-bottom: 40px;
}

.section-heading h2 {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: clamp(2rem, 3vw, 2.6rem);
  font-weight: 600;
}

.section-heading p {
  color: var(--ink-700);
  max-width: 720px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(247, 255, 249, 0.88);
  border-bottom: 1px solid rgba(25, 130, 86, 0.1);
}

.site-header.is-scrolled {
  box-shadow: 0 10px 30px rgba(8, 40, 29, 0.12);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  color: #fff;
  box-shadow: 0 10px 20px rgba(28, 143, 95, 0.25);
}

.logo-mark svg {
  width: 28px;
  height: 28px;
}

.logo-text {
  display: grid;
  gap: 4px;
}

.brand {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: 1.4rem;
  font-weight: 600;
}

.sub {
  font-size: 0.85rem;
  color: var(--ink-600);
}

.menu {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.95rem;
  color: var(--ink-700);
}

.hero {
  padding-top: 120px;
}

.hero-grid {
  display: grid;
  gap: 48px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(43, 191, 113, 0.12);
  color: var(--green-800);
  font-weight: 600;
  font-size: 0.85rem;
}

.hero-text h1 {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: clamp(2.6rem, 4vw, 3.6rem);
  font-weight: 600;
  margin: 18px 0;
  line-height: 1.2;
}

.hero-text p {
  color: var(--ink-700);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: all 0.3s ease;
}

.btn.primary {
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  color: #fff;
  box-shadow: 0 12px 28px rgba(25, 140, 88, 0.25);
}

.btn.ghost {
  border-color: rgba(25, 140, 88, 0.4);
  color: var(--green-800);
  background: rgba(255, 255, 255, 0.8);
}

.btn.small {
  padding: 10px 18px;
  font-size: 0.9rem;
}

.btn:hover {
  transform: translateY(-2px);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.metric {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 16px 30px rgba(20, 90, 60, 0.08);
}

.metric .value {
  display: block;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--green-800);
}

.metric .label {
  color: var(--ink-600);
  font-size: 0.9rem;
}

.hero-card {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.96), rgba(222, 255, 239, 0.9));
  box-shadow: var(--shadow);
  border: 1px solid rgba(31, 143, 95, 0.15);
}

.card-header h3 {
  font-size: 1.5rem;
  margin: 12px 0 8px;
}

.card-header p {
  color: var(--ink-600);
}

.pill {
  display: inline-flex;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--green-200);
  color: var(--green-800);
  font-size: 0.8rem;
  font-weight: 600;
}

.card-list {
  margin: 20px 0 24px;
  display: grid;
  gap: 12px;
  list-style: none;
  color: var(--ink-700);
}

.card-list li {
  padding-left: 26px;
  position: relative;
}

.card-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green-500);
}

.card-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--ink-600);
  font-size: 0.9rem;
}

.value-grid,
.matrix-grid,
.scene-grid,
.cap-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.value-card,
.scene-card,
.cap-card {
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: 0 18px 40px rgba(20, 90, 60, 0.08);
}

.value-card h3,
.scene-card h3,
.cap-card h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.value-card p,
.scene-card p,
.cap-card p {
  color: var(--ink-600);
}

.matrix-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.matrix-card {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid rgba(31, 143, 95, 0.15);
  box-shadow: 0 20px 46px rgba(20, 90, 60, 0.08);
  display: grid;
  gap: 18px;
}

.matrix-card.primary {
  background: linear-gradient(165deg, rgba(220, 255, 233, 0.95), rgba(255, 255, 255, 0.9));
}

.matrix-top h3 {
  font-size: 1.4rem;
  margin-top: 10px;
}

.matrix-top p {
  color: var(--ink-600);
}

.matrix-card ul {
  list-style: none;
  display: grid;
  gap: 10px;
  color: var(--ink-700);
}

.matrix-card li {
  padding-left: 22px;
  position: relative;
}

.matrix-card li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--green-600);
}

.scene-card {
  position: relative;
  overflow: hidden;
}

.scene-index {
  font-size: 2rem;
  font-weight: 700;
  color: rgba(43, 191, 113, 0.18);
  position: absolute;
  top: 18px;
  right: 22px;
}

.flow {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  margin-bottom: 36px;
}

.flow-step {
  padding: 24px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid rgba(31, 143, 95, 0.12);
}

.flow-step span {
  display: inline-flex;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  background: var(--green-200);
  color: var(--green-800);
  font-weight: 700;
  margin-bottom: 12px;
}

.flow-step p {
  color: var(--ink-600);
}

.cta-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--green-600), var(--green-800));
  color: #fff;
  box-shadow: var(--shadow);
}

.cta-card p {
  color: rgba(255, 255, 255, 0.8);
}

.site-footer {
  padding: 48px 0 24px;
  background: #0c2e23;
  color: #d6f1e2;
}

.footer-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-bottom: 32px;
}

.footer-brand {
  font-family: "Source Sans 3", "Noto Sans SC", sans-serif;
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.footer-domain {
  display: inline-flex;
  margin-top: 16px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
}

.footer-links {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.footer-links h4 {
  margin-bottom: 8px;
  font-size: 1rem;
}

.footer-links a {
  display: block;
  color: rgba(214, 241, 226, 0.8);
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  font-size: 0.9rem;
  color: rgba(214, 241, 226, 0.85);
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 860px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .menu {
    gap: 12px;
  }

  .hero {
    padding-top: 96px;
  }

  .section {
    padding: 72px 0;
  }
}

@media (max-width: 560px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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