/* ============================================================
   PlantEcho · Verdant Echo 官网
   Layout & Structural (layout.css)
   ============================================================ */

/* 导航 */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 18px var(--mar);
  transition: background .42s var(--ease), box-shadow .42s var(--ease), padding .42s var(--ease);
}

.nav.scrolled {
  background: rgba(247, 250, 246, .78);
  backdrop-filter: blur(18px) saturate(1.3);
  box-shadow: 0 1px 0 var(--hairline);
  padding-top: 13px;
  padding-bottom: 13px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-shrink: 0;
}

.leaf-mark {
  display: inline-flex;
  width: 26px;
  height: 26px;
  color: var(--primary-container);
}

.leaf-mark svg {
  width: 100%;
  height: 100%;
}

.leaf-mark.big {
  width: 54px;
  height: 54px;
  color: var(--primary-fixed-dim);
}

.nav-wordmark {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: .01em;
  color: var(--primary);
}

.nav-reflection {
  flex: 1;
  font-family: var(--serif);
  font-style: italic;
  font-size: 14.5px;
  color: var(--secondary);
  opacity: .85;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: opacity .42s var(--ease);
}

.nav-links {
  display: flex;
  gap: 26px;
  flex-shrink: 0;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--on-surface-variant);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1.5px;
  background: var(--primary);
  transition: right .35s var(--ease);
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a:hover::after {
  right: 0;
}

@media (max-width: 880px) {
  .nav-reflection {
    display: none;
  }
  .nav-links {
    gap: 16px;
  }
}

@media (max-width: 560px) {
  .nav-links a:nth-child(n+3) {
    display: none;
  }
}

/* 通用 section */
.section {
  padding: clamp(80px, 11vw, 150px) var(--mar);
  max-width: var(--maxw);
  margin-inline: auto;
}

.section-head {
  max-width: 760px;
  margin-bottom: clamp(40px, 6vw, 72px);
}

.kicker,
.eyebrow {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.kicker::before,
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1.5px;
  background: var(--secondary);
  opacity: .6;
}

.section-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--ink);
}

.section-title em {
  font-style: italic;
  color: var(--primary-container);
}

.section-sub {
  margin-top: 22px;
  font-size: clamp(15px, 1.6vw, 18.5px);
  color: var(--on-surface-variant);
  max-width: 640px;
}

/* reveal base */
.reveal {
  opacity: 0;
  transform: translateY(8px);
}

.reveal.in {
  opacity: 1;
  transform: none;
  transition: opacity .55s var(--ease-soft), transform .55s var(--ease-soft);
}

/* 页脚 */
.footer {
  background: linear-gradient(180deg, #15301a, #0c2010);
  color: #dce4d4;
  padding: clamp(70px, 10vw, 120px) var(--mar) 50px;
  margin-top: 60px;
}

.footer-top {
  max-width: var(--maxw);
  margin-inline: auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 30px;
  flex-wrap: wrap;
}

.footer-line {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: #fff;
}

.footer-honest {
  max-width: 680px;
  margin: 48px auto 0;
  font-size: 13px;
  color: rgba(220, 228, 212, .6);
  padding-top: 28px;
  border-top: 1px solid rgba(189, 240, 174, .15);
}

.footer-meta {
  max-width: var(--maxw);
  margin: 36px auto 0;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: rgba(220, 228, 212, .5);
  letter-spacing: .04em;
}