:root {
  --site-primary: #24724d;
  --site-on-primary: #ffffff;
  --site-secondary: #e8f1e9;
  --site-on-secondary: #183c2b;
  --site-background: #f7f8f5;
  --site-on-background: #1e2923;
  --site-font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --site-font-heading: Georgia, "Times New Roman", serif;
  --site-heading-scale: 1;
  --site-spacing-scale: 1;
  --site-radius-scale: 1;
  --site-decoration-opacity: 1;
  --ink: #1e2923;
  --muted: #66736b;
  --line: #e0e6df;
  --paper: #ffffff;
  --soft: #edf3ec;
  --accent: #24724d;
  --accent-dark: #174a32;
  --warm: #f3eee3;
  --radius: calc(18px * var(--site-radius-scale));
  color-scheme: light dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--site-font-body); background: light-dark(var(--site-background), #151a17); color: light-dark(var(--ink), #edf3ee); line-height: 1.65; }
button, input { font: inherit; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
.site-root { min-height: 100vh; background-color: var(--site-background); color: var(--site-on-background); border-radius: 0; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.topline { background: var(--site-primary); color: var(--site-on-primary); font-size: 12px; letter-spacing: .07em; text-transform: uppercase; }
.topline .container { min-height: 34px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.topline span:last-child { opacity: .85; }
.header { background: var(--site-background); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.header-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 11px; min-width: max-content; }
.brand-mark { width: 40px; height: 40px; border-radius: 13px; background: var(--site-primary); color: white; display: grid; place-items: center; font-weight: 800; font-size: 19px; letter-spacing: -.06em; }
/* 品牌名与标语上下两行（原稿是两个行内 span 并排，手机上把头部撑宽、搜索按钮被挤出屏幕） */
.brand-name, .brand-tag { display: block; }
.brand-name { font-size: 15px; line-height: 1.2; font-weight: 760; letter-spacing: -.025em; }
.brand-tag { font-size: 10px; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin-top: 4px; }
.nav { display: flex; align-items: center; gap: 25px; font-size: 13px; color: var(--muted); }
.nav a:hover, .nav a.active { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.search-button, .menu-button { border: 1px solid var(--line); background: transparent; color: inherit; border-radius: 999px; padding: 9px 13px; font-size: 12px; }
.menu-button { display: none; }
.hero { padding: 66px 0 54px; }
.hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; gap: 52px; align-items: center; }
.kicker { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); text-transform: uppercase; letter-spacing: .14em; font-size: 11px; font-weight: 800; }
.kicker:before { content: ""; width: 23px; height: 2px; background: currentColor; }
h1,h2,h3,h4 { font-family: var(--site-font-heading); font-weight: 500; letter-spacing: -.04em; line-height: 1.1; }
h1 { font-size: clamp(42px, 5vw, 66px); margin: 19px 0 20px; max-width: 650px; }
.hero-copy { color: var(--muted); font-size: 16px; max-width: 500px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.primary-btn { border: 0; border-radius: 999px; padding: 13px 20px; background: var(--site-primary); color: white; font-weight: 700; font-size: 13px; display: inline-flex; align-items: center; gap: 12px; }
.primary-btn:hover { background: var(--accent-dark); }
.text-btn { color: var(--accent); font-weight: 700; font-size: 13px; padding: 12px 4px; }
.hero-note { font-size: 11px; color: var(--muted); margin-top: 20px; }
.hero-art { min-height: 380px; position: relative; border-radius: 28px; overflow: hidden; background: #e8eee4; padding: 28px; display: flex; align-items: flex-end; }
.art-sun { position: absolute; width: 190px; height: 190px; border-radius: 50%; background: #d7e5d3; top: -36px; right: -15px; }
.art-window { position: absolute; top: 26px; left: 26px; width: 44%; height: 48%; border: 1px solid rgba(36,114,77,.22); border-radius: 16px; background: rgba(255,255,255,.44); }
.art-window:before, .art-window:after { content: ""; position: absolute; background: rgba(36,114,77,.2); }
.art-window:before { width: 1px; top: 0; bottom: 0; left: 50%; }
.art-window:after { height: 1px; left: 0; right: 0; top: 50%; }
.art-plant { position: absolute; bottom: 95px; right: 58px; width: 105px; height: 150px; }
.art-plant .leaf { position: absolute; width: 42px; height: 76px; background: #4d8865; border-radius: 100% 0 100% 0; transform-origin: bottom right; }
.art-plant .leaf:nth-child(1) { left: 4px; top: 14px; transform: rotate(-32deg); }
.art-plant .leaf:nth-child(2) { left: 41px; top: 1px; transform: rotate(15deg) scale(.9); }
.art-plant .leaf:nth-child(3) { left: 8px; top: 60px; transform: rotate(-65deg) scale(.75); }
.art-plant .stem { position: absolute; left: 50px; top: 53px; height: 92px; width: 3px; background: #346e4b; transform: rotate(5deg); }
.art-plant .pot { position: absolute; bottom: 0; left: 28px; width: 60px; height: 47px; background: #c17d57; clip-path: polygon(8% 0,92% 0,80% 100%,20% 100%); }
.feature-card { position: relative; z-index: 2; width: min(100%, 370px); background: rgba(255,255,255,.94); color: #1e2923; border: 1px solid rgba(255,255,255,.8); box-shadow: 0 18px 55px rgba(32,57,39,.1); border-radius: 19px; padding: 20px; }
.feature-card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: #66736b; }
.feature-card h3 { font-size: 27px; margin: 12px 0 9px; }
.feature-card p { margin: 0; font-size: 12px; color: #66736b; }
.card-link { margin-top: 17px; display: inline-flex; gap: 10px; align-items: center; color: var(--accent); font-weight: 800; font-size: 12px; }
.section { padding: 56px 0; }
.section-soft { background: var(--site-secondary); color: var(--site-on-secondary); }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 27px; }
.section-head h2 { font-size: clamp(30px, 3.4vw, 42px); margin: 11px 0 0; }
.section-head p { max-width: 400px; color: var(--muted); font-size: 13px; margin: 0; }
.link-arrow { font-size: 12px; font-weight: 800; color: var(--accent); white-space: nowrap; }
.topic-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 15px; }
.topic-card { min-height: 180px; border: 1px solid rgba(36,114,77,.15); border-radius: var(--radius); padding: 23px; background: rgba(255,255,255,.62); transition: transform .2s, box-shadow .2s; }
.topic-card:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(26,70,42,.07); }
.topic-icon { width: 43px; height: 43px; display: grid; place-items: center; border-radius: 14px; background: #dcebdd; color: var(--accent); font-size: 20px; }
.topic-card h3 { font-size: 24px; margin: 18px 0 7px; }
.topic-card p { margin: 0; font-size: 12px; color: var(--muted); }
.article-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 19px; }
.article-card { border: 1px solid var(--line); background: var(--paper); border-radius: var(--radius); overflow: hidden; transition: transform .2s, box-shadow .2s; }
.article-card:hover { transform: translateY(-3px); box-shadow: 0 14px 34px rgba(26,45,32,.07); }
.article-visual { height: 170px; display: flex; align-items: flex-end; padding: 17px; overflow: hidden; position: relative; }
.visual-phone { background: #e6eee4; }
.visual-phone .phone { width: 82px; height: 139px; background: #27372d; border: 4px solid #fff; border-radius: 17px; margin: 0 auto -38px; box-shadow: 0 8px 24px #27452f2a; padding: 19px 9px; }
.phone-line { height: 5px; border-radius: 4px; background: #91c59b; margin-bottom: 8px; }
.phone-line.short { width: 55%; }
.phone-circle { width: 29px; height: 29px; background: #d7e7d6; border-radius: 50%; margin: 8px auto 11px; }
.visual-privacy { background: #e9e6dc; }
.visual-privacy .shield { width: 100px; height: 112px; margin: 0 auto -14px; background: #c8d9c6; clip-path: polygon(50% 0,95% 17%,88% 66%,50% 100%,12% 66%,5% 17%); display: grid; place-items: center; font-size: 38px; color: #2b704b; }
.visual-data { background: #dce8ec; }
.data-bars { display: flex; align-items: end; justify-content: center; gap: 10px; width: 100%; height: 110px; }
.data-bars span { width: 28px; border-radius: 7px 7px 0 0; background: #4e8490; }
.data-bars span:nth-child(1) { height: 42%; opacity: .55; }
.data-bars span:nth-child(2) { height: 70%; opacity: .75; }
.data-bars span:nth-child(3) { height: 55%; }
.data-bars span:nth-child(4) { height: 95%; background: #286a58; }
.visual-battery { background: #f0e4d7; }
.battery-art { width: 150px; height: 76px; border: 5px solid #a96f47; border-radius: 13px; margin: 0 auto 18px; position: relative; padding: 7px; }
.battery-art:after { content: ""; position: absolute; right: -13px; top: 21px; height: 25px; width: 8px; background: #a96f47; border-radius: 0 4px 4px 0; }
.battery-fill { width: 68%; height: 100%; background: #86a87d; border-radius: 4px; }
.article-content { padding: 20px; }
.article-meta { display: flex; align-items: center; gap: 9px; color: var(--muted); text-transform: uppercase; letter-spacing: .09em; font-size: 9px; font-weight: 800; }
.article-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--accent); }
.article-content h3 { font-size: 25px; margin: 13px 0 9px; }
.article-content p { color: var(--muted); font-size: 12px; margin: 0; }
.read-link { margin-top: 18px; display: inline-flex; gap: 9px; color: var(--accent); font-weight: 800; font-size: 12px; }
.newsletter { display: grid; grid-template-columns: 1fr auto; gap: 25px; align-items: center; padding: 32px; background: var(--site-primary); color: white; border-radius: 24px; }
.newsletter h2 { font-size: 31px; margin: 0 0 7px; }
.newsletter p { font-size: 12px; margin: 0; color: #e1eee4; }
.newsletter .note { font-size: 11px; color: #e1eee4; max-width: 290px; }
.page-intro { padding: 54px 0 32px; }
.page-intro h1 { font-size: clamp(38px, 4.5vw, 58px); margin: 12px 0 14px; }
.page-intro p { color: var(--muted); max-width: 690px; margin: 0; }
.page-layout { display: grid; grid-template-columns: minmax(0, 760px) minmax(220px, 1fr); gap: 46px; padding-bottom: 70px; }
.article-body { font-size: 15px; line-height: 1.9; }
.article-body h2 { font-size: 31px; margin: 35px 0 13px; }
.article-body h3 { font-size: 23px; margin: 27px 0 10px; }
.article-body p { margin: 0 0 18px; color: #48574d; }
.article-body ul, .article-body ol { padding-left: 23px; margin: 0 0 22px; color: #48574d; }
.article-body li { padding-left: 4px; margin: 8px 0; }
.article-callout { border-left: 3px solid var(--accent); background: var(--soft); padding: 18px 20px; margin: 25px 0; color: #31493a; font-size: 14px; }
.sidebar-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 21px; margin-bottom: 17px; background: var(--paper); }
.sidebar-card h3 { font-size: 22px; margin: 0 0 13px; }
.sidebar-link { display: block; border-top: 1px solid var(--line); padding: 11px 0; color: var(--muted); font-size: 12px; }
.sidebar-link:hover { color: var(--accent); }
.breadcrumbs { padding-top: 25px; font-size: 11px; color: var(--muted); }
.breadcrumbs a { color: var(--accent); }
.policy-content { max-width: 820px; padding-bottom: 75px; }
.policy-content h2 { font-size: 27px; margin: 32px 0 10px; }
.policy-content p, .policy-content li { color: #4d5b52; font-size: 14px; line-height: 1.85; }
.policy-content ul { padding-left: 22px; }
.policy-warning { background: #fff4d8; border: 1px solid #ead9a8; color: #614c1c; padding: 15px 17px; border-radius: 12px; font-size: 12px; margin: 20px 0; }
.search-panel { display: none; border-bottom: 1px solid var(--line); padding: 15px 0; background: var(--paper); }
.search-panel.open { display: block; }
.search-panel form { display: flex; gap: 10px; }
.search-panel input { flex: 1; min-width: 0; border: 1px solid var(--line); border-radius: 999px; background: var(--site-background); color: var(--ink); padding: 12px 16px; outline-color: var(--accent); }
.empty-state { padding: 40px; text-align: center; color: var(--muted); border: 1px dashed var(--line); border-radius: var(--radius); }
.footer { background: #1b2d22; color: #f0f5ef; padding: 48px 0 25px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; }
.footer .brand-tag { color: #b4c6b8; }
.footer-description { max-width: 270px; color: #b4c6b8; font-size: 12px; margin-top: 18px; }
.footer h4 { font: 700 11px var(--site-font-body); letter-spacing: .12em; text-transform: uppercase; margin: 3px 0 15px; color: #b9d2bf; }
.footer a, .footer p { display: block; color: #dce6dd; font-size: 12px; margin: 9px 0; }
.footer a:hover { color: white; text-decoration: underline; }
.footer-bottom { display: flex; justify-content: space-between; gap: 15px; border-top: 1px solid #405246; margin-top: 35px; padding-top: 20px; color: #aebdb1; font-size: 10px; }
.not-found { text-align: center; padding: 90px 0 110px; }
.not-found h1 { font-size: 54px; }
@media (max-width: 850px) {
  .nav { gap: 13px; }
  .hero-grid { gap: 28px; }
  .hero-art { min-height: 340px; }
  .article-grid { grid-template-columns: repeat(2,1fr); }
  .page-layout { grid-template-columns: minmax(0,1fr); gap: 25px; }
  .sidebar { display: grid; grid-template-columns: repeat(2,1fr); gap: 15px; }
  .sidebar-card { margin: 0; }
  .footer-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 640px) {
  .container { width: min(100% - 28px, 1120px); }
  .topline .container { min-height: 31px; font-size: 9px; }
  .header-inner { min-height: 68px; gap: 12px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand-name { font-size: 13px; }
  .brand-tag { font-size: 8px; }
  .menu-button { display: inline-flex; }
  .search-button { padding: 9px 11px; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 68px; padding: 16px 20px 20px; background: var(--site-background); border-bottom: 1px solid var(--line); flex-direction: column; align-items: flex-start; gap: 15px; }
  .nav.open { display: flex; }
  .hero { padding: 42px 0 38px; }
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  h1 { font-size: 43px; }
  .hero-art { min-height: 315px; }
  .section { padding: 41px 0; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 13px; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-card { min-height: 0; }
  .article-grid { grid-template-columns: 1fr; }
  .article-visual { height: 190px; }
  .newsletter { grid-template-columns: 1fr; padding: 25px; }
  .page-intro { padding: 38px 0 25px; }
  .page-intro h1 { font-size: 42px; }
  .sidebar { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px 18px; }
  .footer-grid > div:first-child { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; } }