/* 公开展示首页：白底 + 绿色点缀，简约冷静（避免过暖） */

:root {
  --l-bg: #ffffff;
  --l-bg-soft: #f5faf7;
  --l-ink: #1f2d2a;
  --l-ink-soft: #4a5c57;
  --l-line: #d7e5df;
  --l-green: #2f6f5e;
  --l-green-deep: #245a4c;
  --l-green-soft: #e8f3ee;
  --l-radius: 18px;
  --l-shadow: 0 10px 30px rgba(36, 90, 76, 0.08);
  --l-font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.landing-body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--l-font);
  color: var(--l-ink);
  background: var(--l-bg);
  font-size: 18px;
  line-height: 1.65;
}

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

.landing-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--l-line);
  backdrop-filter: blur(8px);
}

.landing-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.landing-brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
}

.landing-brand-mark {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--l-green-deep);
}

.landing-brand-sub {
  font-size: 0.92rem;
  color: var(--l-ink-soft);
}

.landing-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
}

.landing-nav a {
  color: var(--l-ink-soft);
  font-weight: 500;
  padding: 0.45rem 0.2rem;
}

.landing-nav a:hover {
  color: var(--l-green);
}

.landing-header-actions {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.landing-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  font-weight: 650;
  font-size: 1rem;
  border: 1.5px solid transparent;
  transition: background 0.45s ease, color 0.45s ease, border-color 0.45s ease, transform 0.45s ease;
}

.landing-btn-lg {
  min-height: 56px;
  padding: 0.85rem 1.6rem;
  font-size: 1.08rem;
}

.landing-btn-primary {
  background: var(--l-green);
  color: #fff;
}

.landing-btn-primary:hover {
  background: var(--l-green-deep);
  transform: translateY(-1px);
}

.landing-btn-ghost {
  background: #fff;
  color: var(--l-green-deep);
  border-color: var(--l-line);
}

.landing-btn-ghost:hover {
  border-color: var(--l-green);
  background: var(--l-green-soft);
}

.landing-hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.landing-kicker {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  color: var(--l-green);
}

.landing-hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4vw, 2.85rem);
  line-height: 1.2;
  font-weight: 700;
  color: var(--l-ink);
}

.landing-lead {
  margin: 0 0 1.75rem;
  color: var(--l-ink-soft);
  font-size: 1.08rem;
  max-width: 34em;
}

.landing-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.landing-hero-media {
  margin: 0;
  border-radius: calc(var(--l-radius) + 4px);
  overflow: hidden;
  border: 1px solid var(--l-line);
  box-shadow: var(--l-shadow);
  background: var(--l-bg-soft);
}

.landing-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.landing-section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.landing-section-alt {
  background: var(--l-bg-soft);
  max-width: none;
  padding-left: 0;
  padding-right: 0;
}

.landing-section-alt .landing-section-head,
.landing-section-alt .landing-feature-list {
  max-width: 1120px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.landing-section-head {
  margin-bottom: 1.75rem;
}

.landing-section-head h2 {
  margin: 0 0 0.5rem;
  font-size: 1.85rem;
  color: var(--l-green-deep);
}

.landing-section-head p {
  margin: 0;
  color: var(--l-ink-soft);
}

.landing-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.landing-card {
  background: #fff;
  border: 1px solid var(--l-line);
  border-radius: var(--l-radius);
  padding: 1.5rem;
  box-shadow: var(--l-shadow);
}

.landing-card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.2rem;
  color: var(--l-green-deep);
}

.landing-card p {
  margin: 0;
  color: var(--l-ink-soft);
  font-size: 1rem;
}

.landing-feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.landing-feature-list li {
  display: grid;
  gap: 0.25rem;
  background: #fff;
  border: 1px solid var(--l-line);
  border-radius: 14px;
  padding: 1.15rem 1.35rem;
}

.landing-feature-list strong {
  color: var(--l-green-deep);
  font-size: 1.12rem;
}

.landing-feature-list span {
  color: var(--l-ink-soft);
}

.landing-cta {
  padding: 3rem 1.5rem 4rem;
}

.landing-cta-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  background: var(--l-green-soft);
  border: 1px solid var(--l-line);
  border-radius: calc(var(--l-radius) + 6px);
  padding: 2.5rem 1.75rem;
}

.landing-cta h2 {
  margin: 0 0 0.65rem;
  font-size: 1.75rem;
  color: var(--l-green-deep);
}

.landing-cta p {
  margin: 0 0 1.5rem;
  color: var(--l-ink-soft);
}

.landing-footer {
  border-top: 1px solid var(--l-line);
  padding: 1.5rem;
  text-align: center;
  color: var(--l-ink-soft);
  font-size: 0.95rem;
}

.landing-footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .landing-hero {
    grid-template-columns: 1fr;
    padding-top: 1.75rem;
  }

  .landing-cards {
    grid-template-columns: 1fr;
  }

  .landing-nav {
    order: 3;
    width: 100%;
  }
}