/* =========================================================
   星辰绿意守护 · 官网共享样式
   清新自然绿色系 · 移动端优先 · 深色模式支持
   ========================================================= */

:root {
  --green-50:  #f2f7f1;
  --green-100: #e0ede0;
  --green-200: #c5dcc8;
  --green-300: #9fc4a5;
  --green-400: #6ea87b;
  --green-500: #4d8b5f;
  --green-600: #3b7050;
  --green-700: #2f5a43;
  --green-800: #274a39;
  --green-900: #1f3d30;

  --ink:       #24342b;
  --ink-soft:  #4a5a50;
  --ink-mute:  #6b7a70;
  --paper:     #fbfdfb;
  --paper-soft:#eef6ee;
  --card:      #ffffff;
  --line:      #e2ece2;
  --accent:    #e8a24b; /* 点缀暖色：阳光/提醒 */
  --shadow:    0 10px 30px rgba(38, 74, 51, 0.08);
  --shadow-lg: 0 18px 45px rgba(38, 74, 51, 0.12);
  --radius:    18px;
  --radius-sm: 12px;
  --maxw:      1120px;
  --font:      "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
}

html[data-theme="dark"] {
  --ink:       #e6efe7;
  --ink-soft:  #c2d0c6;
  --ink-mute:  #93a49a;
  --paper:     #18211c;
  --paper-soft:#1f2b23;
  --card:      #23302a;
  --line:      #33443b;
  --green-100: #2d3f34;
  --green-200: #3a5342;
  --green-300: #4f6f5c;
  --shadow:    0 10px 30px rgba(0,0,0,0.35);
  --shadow-lg: 0 18px 45px rgba(0,0,0,0.45);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

/* 防 grid/flex 子项内容撑破容器：长内容在 min-width:auto 下会把卡片撑出视口 */
.hero-grid > *,
.feature-grid > *,
.feature-card .feature-body,
.feature-card .feature-media,
.modules > *,
.scenes > *,
.misc-grid > *,
.steps > *,
.footer-grid > * { min-width: 0; }
.container, .nav, .footer-grid, .footer-bottom { max-width: 100%; overflow-wrap: break-word; }
a { color: var(--green-600); text-decoration: none; }

h1, h2, h3, h4 { line-height: 1.35; font-weight: 700; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ---------- 吸顶导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: var(--maxw); margin: 0 auto;
  padding: 12px 22px;
  display: flex; align-items: center; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--green-700); }
.brand-logo {
  height: 34px; width: auto; max-width: 150px;
  object-fit: contain; display: block;
}
.nav-links { display: flex; gap: 22px; margin-left: 8px; }
.nav-links a { color: var(--ink-soft); font-size: 15px; font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--green-600); }
.nav-cta { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.nav-toggle { display: none; background: none; border: none; color: var(--ink); font-size: 24px; cursor: pointer; }

/* ---------- 通用区块 ---------- */
section { padding: 72px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 46px; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: 0.08em;
  color: var(--green-600); text-transform: uppercase;
  background: var(--green-100); padding: 4px 12px; border-radius: 999px; margin-bottom: 14px;
}
.section-head h2 { font-size: 30px; color: var(--ink); margin-bottom: 12px; }
.section-head p { color: var(--ink-mute); font-size: 16px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 84px 0 72px;
  background:
    radial-gradient(1200px 600px at 85% -10%, var(--green-100) 0%, transparent 55%),
    radial-gradient(900px 500px at -10% 110%, var(--green-50) 0%, transparent 55%),
    var(--paper);
}
.hero-bg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: 0.5; z-index: 0;
  /* 插画已含大量留白，此处轻叠防止抢占视线 */
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 78%);
  mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 78%);
}
.hero .container { position: relative; z-index: 1; }
.hero-grid {
  display: grid; grid-template-columns: 1.05fr 0.95fr;
  align-items: center; gap: 46px;
}
.hero h1 { font-size: 42px; color: var(--ink); letter-spacing: 0.5px; margin-bottom: 18px; }
.hero h1 .g { color: var(--green-600); }
.hero .lead { font-size: 18px; color: var(--ink-soft); max-width: 520px; margin-bottom: 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-meta { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--ink-mute); font-size: 14px; }

.phone-wrap { position: relative; display: grid; place-items: center; }
.phone {
  width: 262px; border-radius: 30px; padding: 9px;
  background: #10170f; box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
}
.phone-screen {
  width: 100%; aspect-ratio: 9 / 19;
  border-radius: 24px; overflow: hidden;
  background: var(--paper-soft);
}
.phone-screen img, .phone-screen .screenshot {
  width: 100%; height: 100%; object-fit: cover; object-position: top;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: all 0.2s; white-space: nowrap;
}
.btn-primary { background: var(--green-600); color: #fff; box-shadow: 0 6px 18px rgba(59,112,80,0.3); }
.btn-primary:hover { background: var(--green-700); transform: translateY(-1px); }
.btn-outline { border-color: var(--green-300); color: var(--green-700); background: transparent; }
.btn-outline:hover { background: var(--green-50); }

/* ---------- 快速答案区块 ---------- */
.qa-quick {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card);
  padding: 26px 30px; margin-top: -20px;
  box-shadow: var(--shadow);
}
.qa-quick h3 { font-size: 16px; color: var(--green-700); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.qa-quick ul { list-style: none; display: grid; gap: 10px; }
.qa-quick li { position: relative; padding-left: 20px; color: var(--ink-soft); font-size: 15px; }
.qa-quick li::before { content: "✓"; position: absolute; left: 0; color: var(--green-500); font-weight: 700; }

/* ---------- 卖点卡 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.feature-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; background: var(--card); box-shadow: var(--shadow);
  display: grid; grid-template-columns: 1fr 1fr; align-items: center;
}
.feature-card.reverse { direction: rtl; }
.feature-card.reverse > * { direction: ltr; }
.feature-body { padding: 30px; }
.feature-num {
  font-size: 13px; font-weight: 700; color: var(--green-500); letter-spacing: 0.1em;
}
.feature-body h3 { font-size: 21px; margin: 8px 0 10px; color: var(--ink); }
.feature-body p { color: var(--ink-soft); font-size: 15px; margin-bottom: 12px; }
.feature-body ul { margin-top: 6px; list-style: none; display: grid; gap: 7px; }
.feature-body li { color: var(--ink-soft); font-size: 14px; position: relative; padding-left: 18px; }
.feature-body li::before { content: "·"; position: absolute; left: 2px; color: var(--green-500); font-weight: 700; }
.feature-media { height: 100%; min-height: 300px; }
.feature-media img, .feature-media .screenshot {
  width: 100%; height: 100%; object-fit: cover; object-position: top;
}
.feature-media .phone-feature {
  height: 100%;
  display: grid; place-items: center; padding: 20px;
  background: var(--green-50);
}
.feature-media .phone-feature .phone { width: 190px; }

/* ---------- 占位截图（用户提供后替换） ---------- */
.screenshot-placeholder {
  width: 100%; height: 100%; display: grid; place-items: center;
  background:
    repeating-linear-gradient(45deg, var(--green-100), var(--green-100) 10px, var(--green-50) 10px, var(--green-50) 20px);
  color: var(--green-700); font-size: 14px; text-align: center; padding: 20px;
}
.screenshot-placeholder strong { display: block; font-size: 15px; margin-bottom: 4px; }

/* ---------- 场景/人群 ---------- */
.scenes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.scene {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 26px;
  background: var(--card); box-shadow: var(--shadow);
}
.scene .icon { font-size: 30px; margin-bottom: 12px; display: block; }
.scene h3 { font-size: 18px; margin-bottom: 8px; color: var(--ink); }
.scene p { color: var(--ink-mute); font-size: 14px; }

/* ---------- 流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.step { position: relative; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 20px; background: var(--card); }
.step::before {
  counter-increment: step; content: counter(step);
  display: block; width: 34px; height: 34px; border-radius: 50%;
  background: var(--green-600); color: #fff; font-weight: 700;
  display: grid; place-items: center; margin-bottom: 12px;
}
.step h3 { font-size: 16px; margin-bottom: 6px; color: var(--ink); }
.step p { color: var(--ink-mute); font-size: 13.5px; }

/* ---------- 次要能力 ---------- */
.misc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.misc {
  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 20px 22px;
  background: var(--card); box-shadow: var(--shadow);
}
.misc h4 { font-size: 16px; margin-bottom: 6px; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.misc p { color: var(--ink-mute); font-size: 13.5px; }

/* ---------- 百科页模块 ---------- */
.modules { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.module {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; background: var(--card); box-shadow: var(--shadow);
  transition: transform 0.2s;
}
.module:hover { transform: translateY(-3px); }
.module .mod-num { font-size: 13px; font-weight: 700; color: var(--green-500); letter-spacing: 0.08em; }
.module h3 { font-size: 19px; margin: 8px 0 8px; color: var(--ink); }
.module p { color: var(--ink-mute); font-size: 14px; }
.module .tags { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag { background: var(--green-100); color: var(--green-700); font-size: 12px; padding: 2px 10px; border-radius: 999px; }

/* ---------- 示例专题 ---------- */
.topic {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; background: var(--card); box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.topic h3 { font-size: 20px; margin-bottom: 10px; color: var(--ink); }
.topic p { color: var(--ink-soft); font-size: 15px; margin-bottom: 10px; }
.topic .chain {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  color: var(--ink-mute); font-size: 13px; margin-top: 8px;
}
.topic .chain .chip { background: var(--green-50); border: 1px solid var(--line); padding: 3px 10px; border-radius: 999px; color: var(--green-700); }

/* ---------- 收费 / 透明 ---------- */
.pricing {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card);
  padding: 30px; box-shadow: var(--shadow);
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; align-items: center;
}
.pricing h3 { font-size: 20px; margin-bottom: 10px; color: var(--ink); }
.pricing p { color: var(--ink-soft); font-size: 15px; margin-bottom: 10px; }
.pricing ul { list-style: none; display: grid; gap: 7px; }
.pricing li { color: var(--ink-soft); font-size: 14px; position: relative; padding-left: 20px; }
.pricing li::before { content: "✓"; position: absolute; left: 0; color: var(--green-500); font-weight: 700; }

/* ---------- FAQ ---------- */
.faq { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--card); margin-bottom: 12px; overflow: hidden;
}
.faq-q {
  width: 100%; text-align: left; background: none; border: none; cursor: pointer;
  padding: 18px 22px; font-size: 16px; font-weight: 600; color: var(--ink);
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-q .plus { transition: transform 0.25s; color: var(--green-500); font-weight: 700; flex-shrink: 0; }
.faq-item.open .plus { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-a-inner { padding: 0 22px 18px; color: var(--ink-soft); font-size: 14.5px; }
.faq-item.open .faq-a { max-height: 400px; }

/* ---------- CTA ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--green-700), var(--green-800));
  color: #fff; text-align: center; padding: 64px 22px;
}
.cta-band h2 { font-size: 30px; margin-bottom: 12px; }
.cta-band p { color: var(--green-100); font-size: 16px; margin-bottom: 26px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-band .btn-primary { background: #fff; color: var(--green-800); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }
.cta-band .btn-primary:hover { background: var(--green-100); }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.cta-band .btn-outline { border-color: var(--green-300); color: #fff; }
.cta-band .btn-outline:hover { background: rgba(255,255,255,0.08); }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 36px 0 30px; background: var(--paper-soft); }
.footer-grid { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; }
.footer-grid h4 { font-size: 15px; margin-bottom: 10px; color: var(--ink); }
.footer-grid p, .footer-grid li { color: var(--ink-mute); font-size: 13.5px; }
.footer-grid ul { list-style: none; }
.footer-grid a { color: var(--ink-mute); }
.footer-grid a:hover { color: var(--green-600); }
.footer-bottom { max-width: var(--maxw); margin: 26px auto 0; padding: 18px 22px 0; border-top: 1px solid var(--line); color: var(--ink-mute); font-size: 12.5px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ---------- 主题切换 ---------- */
.theme-toggle { background: none; border: 1px solid var(--line); border-radius: 999px; width: 40px; height: 40px; cursor: pointer; font-size: 17px; color: var(--ink); display: grid; place-items: center; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero-grid, .feature-card, .feature-card.reverse {
    grid-template-columns: 1fr;
  }
  .feature-card.reverse { direction: ltr; }
  .feature-media, .feature-media .phone-feature { min-height: 220px; }
  .feature-card { direction: ltr; }
  .feature-card .feature-media > img, .feature-card .feature-media > .screenshot { object-position: top; }
  .scenes, .misc-grid, .modules { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .pricing { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  section { padding: 52px 0; }
  .hero { padding: 56px 0 52px; }
  .hero h1 { font-size: 30px; }
  .steps { grid-template-columns: 1fr; }
  .section-head h2 { font-size: 24px; }
  .nav-links {
    display: none; flex-direction: column; gap: 14px;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    padding: 18px 22px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-cta .brand-cta-hidden { display: none; }
}