:root {
  --bg: #e8f5e9;
  --bg-soft: #f3faf4;
  --card: #ffffff;
  --line: rgba(27, 94, 32, 0.12);
  --text: #333333;
  --muted: #5f6b66;
  --brand: #2e7d32;
  --brand-2: #4caf50;
  --brand-dark: #1b5e20;
  --radius: 16px;
  --shadow: 0 10px 28px rgba(27, 94, 32, 0.08);
  --max: 860px;
  --max-wide: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(1000px 520px at 8% -8%, rgba(139, 195, 74, 0.28), transparent 58%),
    radial-gradient(900px 480px at 100% 0%, rgba(76, 175, 80, 0.14), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.7;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}
.wrap-wide {
  width: min(var(--max-wide), calc(100% - 2rem));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: linear-gradient(90deg, #2e7d32, #4caf50);
  box-shadow: 0 2px 12px rgba(27, 94, 32, 0.12);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: #fff;
  font-weight: 800;
  text-decoration: none;
}
.logo:hover { text-decoration: none; opacity: 0.95; }
.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: #fff;
  color: var(--brand-dark);
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  font-weight: 900;
}
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}
.nav-links a {
  color: rgba(255, 255, 255, 0.95);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}
.nav-links a:hover { text-decoration: underline; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 0;
  border-radius: 999px;
  padding: 0.7rem 1.15rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none !important;
}
.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff !important;
  box-shadow: 0 8px 22px rgba(46, 125, 50, 0.28);
}
.btn-ghost {
  background: #fff;
  color: var(--brand-dark) !important;
  border: 1px solid rgba(46, 125, 50, 0.28);
}
.btn-sm { padding: 0.5rem 0.9rem; font-size: 0.9rem; }
.nav .btn-primary {
  background: #fff;
  color: var(--brand-dark) !important;
}

.hero {
  padding: 2.6rem 0 1.4rem;
}
.hero h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  letter-spacing: -0.02em;
  color: var(--brand-dark);
}
.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 40rem;
}
.eyebrow {
  display: inline-flex;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  background: rgba(76, 175, 80, 0.14);
  color: var(--brand-dark);
  font-size: 0.82rem;
  font-weight: 700;
  border: 1px solid rgba(46, 125, 50, 0.22);
  margin-bottom: 0.8rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.35rem;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.1rem;
  padding: 0.5rem 0 3rem;
}
.video-card {
  overflow: hidden;
  padding: 0;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.video-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(27, 94, 32, 0.12);
}
.video-card a.cover {
  display: block;
  aspect-ratio: 16 / 10;
  background: #1b5e20;
  overflow: hidden;
}
.video-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.video-card .body {
  padding: 1rem 1.1rem 1.15rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.video-card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.08rem;
  color: var(--brand-dark);
  line-height: 1.35;
}
.video-card h2 a {
  color: inherit;
  text-decoration: none;
}
.video-card h2 a:hover { color: var(--brand); }
.meta {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.55rem;
}
.video-card p {
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-size: 0.92rem;
  flex: 1;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
}
.tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-dark);
  background: rgba(232, 245, 233, 0.95);
  border: 1px solid rgba(46, 125, 50, 0.16);
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
}

.article { padding: 1.5rem 0 3rem; }
.article h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  color: var(--brand-dark);
  line-height: 1.3;
}
.article .lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1.2rem;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1rem 0 1.4rem;
}

.embed {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: calc(var(--radius) - 2px);
  overflow: hidden;
  background: #111;
  box-shadow: var(--shadow);
  margin: 0 0 1.5rem;
}
.embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.prose h2 {
  margin: 1.8rem 0 0.7rem;
  font-size: 1.25rem;
  color: var(--brand-dark);
}
.prose h3 {
  margin: 1.2rem 0 0.5rem;
  font-size: 1.05rem;
  color: var(--brand-dark);
}
.prose p, .prose li { color: var(--muted); }
.prose ul, .prose ol { padding-left: 1.2rem; }
.prose code, .inline-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88em;
  background: rgba(46, 125, 50, 0.08);
  border: 1px solid rgba(46, 125, 50, 0.12);
  border-radius: 6px;
  padding: 0.1rem 0.35rem;
  color: var(--brand-dark);
}
.prose pre {
  background: #1b2e22;
  color: #e8f5e9;
  border-radius: 12px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.55;
  border: 1px solid rgba(27, 94, 32, 0.25);
}
.prose pre code {
  background: none;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: inherit;
}
.note-box {
  background: #fff8e1;
  border: 1px solid rgba(249, 168, 37, 0.35);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  color: #6d4c0f;
  font-size: 0.92rem;
  margin: 1rem 0;
}
.preview {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
  display: block;
  margin: 0.8rem 0 0.3rem;
}
.caption {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

footer {
  padding: 1.6rem 0 2.4rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}
.foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  align-items: center;
}

@media (max-width: 640px) {
  .nav-inner { padding: 0.75rem 0; }
}