:root{
  --ink:#1d2a2e;        /* 墨青：账本与钢笔墨色 */
  --accent:#0e5a48;     /* 账本绿：传统商务记账册的墨绿 */
  --paper:#f5f2ea;      /* 米纸底色，低饱和打底 */
  --paper-2:#ece7da;
  --line:#c9c2b0;
  --muted:#5c6660;
  --fs-hero:clamp(2.2rem,5vw,3.6rem);
  --fs-h2:clamp(1.4rem,2.5vw,1.9rem);
  --fs-h3:1.15rem;
  --fs-body:1rem;
  --fs-small:.85rem;
  --sp:24px;
  --grid-h:68px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:Georgia,"Times New Roman","Songti SC","SimSun",serif;color:var(--ink);background:var(--paper);line-height:1.75;font-size:var(--fs-body)}
.wrap{max-width:1280px;margin:0 auto;padding:0 var(--sp)}
h1,h2,h3{font-weight:700;letter-spacing:.02em;line-height:1.25}
h1{font-size:var(--fs-hero)}
h2{font-size:var(--fs-h2)}
p,li,dd{max-width:62ch}
a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
a:hover{color:var(--ink)}
a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
img{max-width:100%;height:auto}

/* header */
.site-head{border-bottom:2px solid var(--ink);background:var(--paper)}
.head-in{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:var(--grid-h);flex-wrap:wrap}
.nav{display:flex;gap:24px;flex-wrap:wrap}
.nav a{text-decoration:none;color:var(--ink);font-size:var(--fs-small);letter-spacing:.12em;padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover{border-bottom-color:var(--accent)}
.nav a[aria-current="page"]{border-bottom-color:var(--ink);font-weight:700}

/* breadcrumb */
.breadcrumb{font-size:12px;letter-spacing:.08em;color:var(--muted);margin:24px 0}
.breadcrumb a{color:var(--muted);text-decoration:none}
.breadcrumb a:hover{color:var(--accent);text-decoration:underline}
.breadcrumb span{margin:0 8px}

/* buttons */
.btn{display:inline-block;background:var(--ink);color:var(--paper);padding:12px 32px;text-decoration:none;border:2px solid var(--ink);letter-spacing:.08em;font-size:var(--fs-small);transition:background .15s,color .15s}
.btn:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--paper)}

/* index hero: split */
.hero-split{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding:64px 0;border-bottom:1px solid var(--line)}
.kicker{font-size:var(--fs-small);letter-spacing:.3em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}
.hero-copy .lead{margin:24px 0 32px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.hero-fig figcaption{font-size:var(--fs-small);color:var(--muted);margin-top:12px}
.hero-fig img{border:1px solid var(--ink)}

section{padding:48px 0}
section h2{margin-bottom:24px}
.sec-note{margin-bottom:24px;color:var(--muted)}

/* caps */
.caps{border-bottom:1px solid var(--line)}
.cap-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.cap{border-top:4px solid var(--ink);padding-top:16px}
.cap h3{margin-bottom:12px;color:var(--accent)}

/* items grid (contract) */
.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(--ink)}
.item h2,.item h3{font-size:var(--fs-h3);margin:12px 0 8px}
.item p{font-size:var(--fs-small);color:var(--muted)}
.item ul{margin:12px 0 0;padding-left:20px;font-size:var(--fs-small)}
.item li{margin-bottom:6px}
@media(max-width:760px){.items{grid-template-columns:minmax(0,1fr)}}

/* process */
.process{border-bottom:1px solid var(--line)}
.steps{list-style:none;counter-reset:s;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.steps li{border-left:2px solid var(--ink);padding-left:16px}
.steps span{font-size:var(--fs-h2);color:var(--accent);font-weight:700;letter-spacing:.05em}
.steps h3{font-size:var(--fs-h3);margin:8px 0}
.steps p{font-size:var(--fs-small);color:var(--muted)}

/* faq */
.faq-block dl{border-top:2px solid var(--ink)}
.faq-block dt{font-weight:700;margin-top:24px}
.faq-block dd{margin-top:8px;padding-left:0;color:var(--ink)}

/* cta */
.cta-block{background:var(--ink);color:var(--paper);margin-top:48px;padding:64px var(--sp)}
.cta-block h2{color:var(--paper)}
.cta-block p{margin:16px 0 32px;color:#cfd6d2}
.cta-block a:not(.btn){color:#cfd6d2}

/* hero variants */
.hero-type h1{border-bottom:6px solid var(--accent);display:inline-block;padding-bottom:16px}
.hero-type-sub{margin-top:16px;color:var(--muted);letter-spacing:.08em}
.hero-band{background:var(--paper-2);border-top:6px solid var(--accent);border-bottom:1px solid var(--ink);margin:0 calc(-1*var(--sp));padding:64px var(--sp)}
.hero-band-lead{margin-top:24px}
.hero-split+.caps+*,.hero-contact{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center;padding:64px 0}
.contact-copy h1{margin-bottom:16px}

/* about */
.about-grid{display:grid;grid-template-columns:1.4fr .8fr;gap:48px;align-items:start}
.about-text article{margin-bottom:32px;border-top:1px solid var(--line);padding-top:24px}
.about-side{position:sticky;top:24px;border:1px solid var(--ink);padding:24px;background:#fff}
.side-note{font-size:var(--fs-small);color:var(--muted);margin-top:12px}
.side-link{margin-top:12px;font-size:var(--fs-small)}

/* article */
.article-body article,.article-body .faq-list,.article-body .hero-type{max-width:100%}
.art-lead{font-size:1.1rem;margin:16px 0 32px}
.art-fig img{border:1px solid var(--ink);margin:16px 0 32px}
.article-body h2{margin:48px 0 16px;color:var(--accent)}
.article-body p{margin-bottom:16px}
table{border-collapse:collapse;width:100%;margin:16px 0 32px;background:#fff}
caption{text-align:left;font-size:var(--fs-small);color:var(--muted);margin-bottom:8px}
th,td{border:1px solid var(--ink);padding:12px;text-align:left;font-size:var(--fs-small)}
th{background:var(--paper-2)}
.faq-list{border-top:2px solid var(--ink)}
.faq-list dt{font-weight:700;font-size:var(--fs-h3);margin-top:32px}
.faq-list dd{margin-top:8px}

/* steps reuse in contact */
.cprocess .steps{margin-top:8px}
.cfaq dt{font-weight:700;margin-top:24px}
.cfaq dd{margin-top:8px}

/* footer */
.site-foot{border-top:2px solid var(--ink);background:var(--paper-2);margin-top:48px}
.foot-in{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;padding:32px var(--sp)}
.foot-in nav{display:flex;gap:16px;flex-wrap:wrap}
.foot-in a{font-size:var(--fs-small)}

@media(max-width:900px){
  .hero-split,.about-grid,.hero-contact{grid-template-columns:minmax(0,1fr)}
  .cap-list,.steps{grid-template-columns:minmax(0,1fr)}
  .about-side{position:static}
  .head-in{flex-direction:column;align-items:flex-start;padding-top:16px;padding-bottom:16px}
}