:root {
  --bg: #ffffff;
  --text: #1f2a37;
  --muted: #5b6b7b;
  --primary: #1f8a70; /* 森林绿 */
  --primary-dark: #166a56;
  --accent: #4aa8d8; /* 天空蓝 */
  --surface: #f4f8f9;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  --radius: 14px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0; left: 0; right: 0;
  background: rgba(255,255,255,0.8);
  backdrop-filter: saturate(1.2) blur(8px);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  z-index: 100;
}
.header-inner { display: flex; align-items: center; gap: 20px; padding: 14px 0; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-icon { width: 32px; height: 32px; }
.brand-name { font-weight: 700; color: var(--text); }
.nav { display: flex; gap: 16px; flex: 1; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 500; padding: 4px 8px; }
.nav a:hover { color: var(--text); }
.nav a.active { background: #fff7d6; border-radius: 8px; color: var(--text); }
.cta-small { white-space: nowrap; }


/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform .06s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.secondary { background: #e6f5f1; color: var(--primary-dark); }
.btn-large { padding: 14px 22px; font-size: 1.05rem; }

/* Hero */
.hero { position: relative; padding: 80px 0; overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0; z-index: -1;
  background: url('/images/background.webp') top/cover no-repeat;
  /* 降低背景亮度与对比，避免文字被复杂纹理干扰 */
  filter: brightness(0.78) contrast(1.02) saturate(1.0);
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  /* 更强的柔光遮罩，提升前景文字可读性 */
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(255,255,255,0.9) 38%, rgba(255,255,255,1) 82%);
}
.hero-title { font-size: clamp(28px, 4vw, 40px); margin: 0 0 10px; }
.hero-title { text-shadow: 0 1px 2px rgba(255,255,255,0.5), 0 6px 22px rgba(0,0,0,0.06); }
.hero-subtitle { color: var(--muted); font-size: clamp(16px, 2.4vw, 18px); max-width: 760px; }
.hero-actions { display: flex; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.hero-content { background: rgba(255,255,255,0.66); backdrop-filter: blur(3px); border-radius: 18px; padding: 22px; box-shadow: var(--shadow); }
.advantages { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; list-style: none; padding: 26px 0 0; margin: 0; }
.advantages li { background: var(--surface); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.advantages h3 { margin: 0 0 6px; font-size: 1.05rem; }
.advantages p { margin: 0; color: var(--muted); }

/* Sections */
.section { padding: 64px 0; }
.section.alt { background: var(--surface); }
.section-title { font-size: 1.8rem; margin: 0 0 18px; }
.lead { color: var(--muted); }
.points { margin: 12px 0 0; padding-left: 18px; }
.points li { margin-bottom: 6px; }
.concept-block { background: #fff; border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); margin-bottom: 16px; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: #fff; border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);margin:16px 0; }
.card h3 { margin-top: 0; }
.card .tag { margin: 10px 0 0; color: var(--accent); font-weight: 600; }

/* TT */
.tt { text-align: center; }

/* Tools */
.tools .tool-items { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.tool { background: #fff; border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }

/* About */
.about .about-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 18px; align-items: start; }
.about-figure { margin: 0; }
.about-figure img { width: 100%; border-radius: var(--radius); box-shadow: var(--shadow); }

/* CTA */
.cta { background: linear-gradient(135deg, #e6f5f1, #f0fbff); padding: 48px 0; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.cta h2 { margin: 0 0 8px; }

/* Footer */
.site-footer { background: #0f2a25; color: #cce9e2; }
.footer-inner { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 18px; padding: 22px 0; align-items: center; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand img { width: 28px; height: 28px; }
.slogan { color: #9fd6c8; margin: 2px 0 0; }
.footer-links { display: flex; gap: 10px; align-items: center; padding-left:15px }
.footer-links a { color: #cce9e2; text-decoration: none; }
.footer-links a:hover { color: #ffffff; }
.corp { margin: 0; text-align: right; color: #9fd6c8; }
/* Legal links */
.legal { grid-column: 1 / -1; margin: 8px 0 0; text-align: center; font-size: 12px; color: #9fb3ac; }
.legal img {vertical-align:-1px;width:12px}
.legal a { color: #9fb3ac; text-decoration: none; margin: 0 12px; }
.legal a:hover { color: #cce9e2; }

/* Responsive */
@media (max-width: 960px) {
  .advantages { grid-template-columns: repeat(2, 1fr); }
  .cards { grid-template-columns: 1fr; }
  .tools .tool-items { grid-template-columns: 1fr; }
  .about .about-grid { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; text-align: center; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .corp { text-align: center; }
  .hero-content { padding: 18px; }
}

/* New: Forms & grids */
.grid2 { display: grid; grid-template-columns: 1.2fr 1fr; gap: 16px; }
.form label, .form fieldset { display: block; margin: 10px 0; }
.form input[type="text"], .form input[type="email"], .form input[type="number"], .form select { 
  width: 100%; padding: 10px; border: 1px solid #dde5ea; border-radius: 10px; 
  margin-top: 8px;
}
.form fieldset { border: 1px dashed #dde5ea; border-radius: 10px; padding: 10px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.muted { color: var(--muted); }
.list { margin: 8px 0; padding-left: 0; }
.list > div, .list > li { margin: 4px 0 4px 16px; }

/* Chips */
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chips button { padding: 8px 12px; border-radius: 999px; border: none; background: #f6fbfa; cursor: pointer; box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.chips button.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* (removed page-scoped override; chips buttons are now global) */

/* Chat */
.chat-controls { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.chat-box { height: 240px; overflow: auto; border: 1px solid #dde5ea; border-radius: 12px; padding: 10px; background: #fafcfd; }
.bubble { max-width: 80%; padding: 10px 12px; border-radius: 12px; margin: 6px 0; box-shadow: var(--shadow); }
.bubble.user { background: #e6f5f1; margin-left: auto; }
.bubble.assistant { background: #fff; }
.chat-input { display: flex; gap: 8px; margin-top: 8px; }
.chat-input input { flex: 1; padding: 10px; border: 1px solid #dde5ea; border-radius: 10px; }

/* Phrase */
.phrase-box { border: 1px solid #dde5ea; margin: 10px 0; border-radius: 12px; padding: 12px; background: #fff; min-height: 54px; }

/* Responsive additions */
@media (max-width: 960px) {
  .grid2 { grid-template-columns: 1fr; }
}