:root{
  --wood-deep:#4a3323;      /* 深胡桃 */
  --wood-main:#8a5a35;      /* 主木色 */
  --wood-light:#c99a6b;     /* 浅木 */
  --paper:#f4ede2;          /* 米纸底 */
  --paper-2:#eaddc9;
  --ink:#2b2016;
  --line:#b7a488;
  --fs-hero:clamp(2.2rem,5vw,3.6rem);
  --fs-h2:1.5rem;
  --fs-h3:1.1rem;
  --fs-body:1rem;
  --fs-small:.85rem;
  --fs-bc:.75rem;
  --gap:24px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--paper);color:var(--ink);font-family:"Noto Serif SC","Songti SC","SimSun",serif;line-height:1.75;font-size:var(--fs-body)}
.wrap{max-width:1280px;margin:0 auto;padding:0 24px}
a{color:var(--wood-main);text-decoration:underline;text-underline-offset:3px}
a:hover{color:var(--wood-deep);background:var(--paper-2)}
a:focus{outline:2px solid var(--wood-main);outline-offset:2px}
h1,h2,h3{font-weight:700;letter-spacing:.06em;color:var(--wood-deep)}
h1{font-size:var(--fs-hero);line-height:1.25}
h2{font-size:var(--fs-h2);border-left:6px solid var(--wood-main);padding-left:12px;margin:64px 0 var(--gap)}
h3{font-size:var(--fs-h3)}
section{padding:32px 0}
.btn{display:inline-block;background:var(--wood-main);color:var(--paper);padding:12px 32px;text-decoration:none;border:1px solid var(--wood-deep);letter-spacing:.12em}
.btn:hover{background:var(--wood-deep);color:var(--paper)}
.site-header{border-bottom:3px solid var(--wood-deep);background:var(--paper)}
.header-row{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;padding-top:16px;padding-bottom:16px}
.site-header nav a{margin-left:16px;text-decoration:none;color:var(--ink);font-size:var(--fs-small);letter-spacing:.1em}
.site-header nav a:hover{color:var(--wood-main);background:none}
.site-header nav a[aria-current]{color:var(--wood-main);border-bottom:2px solid var(--wood-main)}
.breadcrumb{font-size:var(--fs-bc);letter-spacing:.12em;color:var(--line);margin-top:16px}
.breadcrumb a{color:var(--line)}
.breadcrumb a:hover{color:var(--wood-main);background:none}
.breadcrumb span{margin:0 6px}
img{max-width:100%;height:auto}

/* 首页首屏：左右分栏，结构线框 */
.hero-split{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding:64px 24px}
.hero-split img{border:1px solid var(--line);padding:8px;background:#fff}
.hero-split p{max-width:62ch;margin:24px 0}

/* 能力：主叙述+边线小块 */
.ab-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ab{border-top:3px solid var(--wood-deep);padding-top:16px}
.ab p{max-width:60ch}

/* 九宫格（契约规则） */
.items{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.item img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;display:block;border:1px solid var(--line)}
.item h2,.item h3{margin:12px 0 4px;font-size:var(--fs-h3)}
.item p{font-size:var(--fs-small)}
.item ul{margin:8px 0 0 18px;font-size:var(--fs-small)}
.lead{max-width:62ch;margin-bottom:24px}
@media(max-width:760px){.items{grid-template-columns:minmax(0,1fr)}}

/* 流程：编号竖列 */
.process ol{list-style:none;counter-reset:step;margin-left:0;max-width:900px}
.process li{counter-increment:step;padding:16px 0 16px 64px;position:relative;border-bottom:1px dashed var(--line)}
.process li::before{content:"0" counter(step);position:absolute;left:0;top:16px;font-weight:700;color:var(--wood-main);font-size:1.4rem}

/* FAQ */
details{border-bottom:1px solid var(--line);padding:12px 0;max-width:900px}
summary{cursor:pointer;font-weight:700;color:var(--wood-deep)}
summary:hover{color:var(--wood-main)}
details p{margin-top:8px}

/* 关于页：双栏正文 */
.about-hero{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center;padding:48px 0}
.text-cols{column-gap:48px}
.text-cols p{margin-bottom:24px;max-width:70ch}
.contact-hero{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;padding:48px 0}
.svc-intro h1{margin-bottom:16px}
.guide{max-width:920px}
.guide h2{margin-top:48px}
.guide table{width:100%;border-collapse:collapse;margin:24px 0;font-size:var(--fs-small)}
.guide th,.guide td{border:1px solid var(--line);padding:12px;text-align:left}
.guide th{background:var(--paper-2);color:var(--wood-deep)}
.guide caption{caption-side:top;text-align:left;font-size:var(--fs-bc);letter-spacing:.1em;color:var(--line);padding-bottom:8px}
.cta{border:3px solid var(--wood-deep);padding:48px 24px;margin:48px 0;text-align:center;background:var(--paper-2)}
.cta h2{border:none;padding:0;margin:0 0 12px}
.site-footer{border-top:3px solid var(--wood-deep);margin-top:64px;padding:32px 0;background:var(--paper)}
.site-footer p{font-size:var(--fs-small)}
.site-footer nav{font-size:var(--fs-small);margin-top:8px}

@media(max-width:900px){
  .hero-split,.about-hero,.contact-hero,.ab-grid{grid-template-columns:1fr}
  .hero-split{padding:32px 24px;gap:32px}
}