/* ================================================================
   绿意寻踪 · 共享样式
   配色：米白纸感 + 墨绿主调 + 赭红点缀
   字体：Noto Serif SC（中文衬线）/ Cormorant Garamond（拉丁衬线）/ Inter（无衬线）
   ================================================================ */

:root {
  --paper:        #f3eedf;
  --paper-dark:   #ebe4d0;
  --paper-darker: #ddd4ba;
  --ink:          #1f2419;
  --ink-soft:     #3a3a2c;
  --ink-mute:     #6b6953;
  --moss:         #2d4a2a;
  --moss-soft:    #4f6a3e;
  --terracotta:   #9c4a2a;
  --rust:         #b85a3e;
  --line:         #c9bf9e;
  --line-soft:    #d8cfad;

  --serif-zh: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --serif-la: "Cormorant Garamond", "Times New Roman", serif;
  --sans:     "Inter", -apple-system, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono:     "JetBrains Mono", "SF Mono", Menlo, monospace;
}

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

html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  /* 极淡的纸纹 */
  background-image:
    radial-gradient(circle at 20% 30%, rgba(0,0,0,0.015) 0%, transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(0,0,0,0.015) 0%, transparent 60%);
  min-height: 100vh;
}

img { max-width: 100%; display: block; }
a   { color: var(--moss); text-decoration: none; }
a:hover { color: var(--terracotta); }

/* ---------- 页头 ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(8px);
  background: rgba(243, 238, 223, 0.92);
}
.site-header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.site-brand {
  display: flex; align-items: center; gap: 14px;
}
.site-brand-mark {
  width: 36px; height: 36px;
  border: 1.5px solid var(--moss);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif-la);
  font-style: italic;
  font-size: 17px;
  color: var(--moss);
  flex-shrink: 0;
}
.site-brand-logo {
  height: 40px;
  width: auto;
  max-width: 160px;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}
.site-brand-text {
  display: flex; flex-direction: column; line-height: 1.15;
}
.site-brand-name {
  font-family: var(--serif-zh);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.5px;
  color: var(--ink);
}
.site-brand-sub {
  font-family: var(--serif-la);
  font-style: italic;
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.4px;
}

.site-nav {
  display: flex; gap: 28px; align-items: center;
}
.site-nav a {
  font-family: var(--serif-zh);
  font-size: 14px;
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
}
.site-nav a.active {
  color: var(--moss);
}
.site-nav a.active::after {
  content: ""; position: absolute; bottom: -2px; left: 0; right: 0;
  height: 1.5px; background: var(--moss);
}
.site-nav a:hover { color: var(--terracotta); }

/* ---------- 通用容器 ---------- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}
.container-narrow {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- 章节通用 ---------- */
.section {
  padding: 80px 0;
  border-bottom: 1px solid var(--line-soft);
}
.section:last-child { border-bottom: none; }
.section-eyebrow {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--serif-la);
  font-style: italic;
  color: var(--moss);
  font-size: 14px;
  letter-spacing: 1px;
  margin-bottom: 24px;
  text-transform: uppercase;
}
.section-eyebrow::before {
  content: ""; width: 32px; height: 1px; background: var(--moss);
}
.section-title {
  font-family: var(--serif-zh);
  font-weight: 500;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.25;
  color: var(--ink);
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.section-lead {
  font-family: var(--serif-zh);
  font-weight: 300;
  font-size: 18px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 720px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  color: var(--paper-dark);
  padding: 60px 0 40px;
  margin-top: 0;
}
.site-footer .container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.site-footer h4 {
  font-family: var(--serif-la);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--paper-darker);
  text-transform: uppercase;
  margin-bottom: 16px;
  font-weight: 400;
}
.site-footer .brand-title {
  font-family: var(--serif-zh);
  font-size: 18px;
  color: var(--paper);
  margin-bottom: 8px;
  font-weight: 500;
}
.site-footer .brand-sub {
  font-family: var(--serif-la);
  font-style: italic;
  font-size: 14px;
  color: var(--paper-darker);
  margin-bottom: 16px;
}
.site-footer p, .site-footer li, .site-footer a {
  color: var(--paper-dark);
  font-size: 13px;
  line-height: 1.7;
}
.site-footer ul { list-style: none; }
.site-footer a:hover { color: var(--rust); }
.footer-bottom {
  max-width: 1280px;
  margin: 48px auto 0;
  padding: 24px 32px 0;
  border-top: 1px solid #3a3a2c;
  font-family: var(--serif-la);
  font-style: italic;
  font-size: 12px;
  color: var(--ink-mute);
  display: flex; justify-content: space-between; align-items: center;
}

/* ---------- 通用：标本编号徽章 ---------- */
.specimen-no {
  font-family: var(--serif-la);
  font-style: italic;
  font-size: 13px;
  color: var(--moss);
  letter-spacing: 0.5px;
}

/* ---------- 图片占位 ---------- */
.img-placeholder {
  background:
    repeating-linear-gradient(
      45deg,
      var(--paper-dark) 0,
      var(--paper-dark) 8px,
      var(--paper-darker) 8px,
      var(--paper-darker) 16px
    );
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-mute);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.img-placeholder::after {
  content: attr(data-label);
  background: var(--paper);
  padding: 4px 12px;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--ink-mute);
  white-space: nowrap;
}
.img-placeholder.has-icon::before {
  content: "";
  position: absolute;
  width: 40px; height: 40px;
  top: calc(50% - 28px); left: 50%;
  transform: translateX(-50%);
  background: var(--paper);
  border-radius: 50%;
  border: 1px solid var(--line);
}

/* ---------- 真实图片（替代占位） ---------- */
.plant-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .site-header-inner { padding: 14px 20px; }
  .site-nav { gap: 16px; }
  .site-nav a { font-size: 13px; }
  .container, .container-narrow { padding: 0 20px; }
  .section { padding: 56px 0; }
  .site-brand-name { font-size: 13px; }
  .site-brand-sub { font-size: 11px; }
  .site-footer .container { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; padding: 16px 20px 0; }
}