/* Mu Ling Construction — single-page site. Hand-written, no toolchain. Palette ratified by C2 (M3). */
:root{
  --ink:#111827; --ink2:#1F2937; --accent:#C2722E; --accent-d:#A85F22;
  --bg:#FFFFFF; --bg-alt:#F5F5F4; --tx:#374151; --tx-soft:#6B7280; --line:#E5E7EB; --white:#fff;
  --r:12px; --r-s:8px; --wrap:1140px; --sp:8px;
  --fs: "Inter", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:76px;-webkit-text-size-adjust:100%}
body{font-family:var(--fs);color:var(--tx);background:var(--bg);line-height:1.6;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{color:var(--ink);line-height:1.25;font-weight:700}
h1{font-size:clamp(1.9rem,4.2vw,3rem)}
h2{font-size:clamp(1.5rem,3vw,1.95rem)}
h3{font-size:1.15rem;font-weight:600}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.wrap-narrow{max-width:780px}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:#fff;padding:10px 16px;z-index:100}
.skip:focus{left:8px;top:8px}

/* buttons */
.btn{display:inline-block;padding:13px 24px;border-radius:var(--r-s);font-weight:600;border:1.5px solid transparent;cursor:pointer;transition:.18s;font-size:.97rem;font-family:inherit;text-align:center}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-primary:hover{background:var(--accent-d);border-color:var(--accent-d);box-shadow:0 6px 18px rgba(194,114,46,.32);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

/* header */
.hdr{position:sticky;top:0;z-index:50;background:rgba(17,24,39,.97);backdrop-filter:saturate(150%) blur(6px);color:#fff}
.hdr-in{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:#fff}
.brand img{border-radius:6px}
.brand-tx{display:flex;flex-direction:column;line-height:1.05}
.brand-tx b{font-size:1.05rem}
.brand-tx i{font-style:normal;font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:#cbd5e1}
.nav{display:flex;gap:22px;margin-left:auto;font-size:.94rem}
.nav a{color:#e5e7eb;padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover{color:#fff;border-color:var(--accent)}
.hdr-cta{display:flex;align-items:center;gap:12px}
.lang{display:flex;border:1px solid #374151;border-radius:999px;overflow:hidden}
.lang button{background:transparent;color:#cbd5e1;border:0;padding:5px 11px;font-size:.8rem;cursor:pointer;font-family:inherit}
.lang button.on{background:var(--accent);color:#fff}
.tel{color:#fff;border-color:#374151;padding:9px 14px;font-size:.9rem;white-space:nowrap}
.tel:hover{color:#fff;border-color:var(--accent);background:rgba(194,114,46,.18)}
.burger{display:none;background:transparent;border:0;color:#fff;font-size:1.7rem;cursor:pointer;line-height:1}

/* hero */
.hero{background:linear-gradient(160deg,#111827,#1F2937);color:#fff}
.hero-in{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:72px 20px}
.eyebrow{color:#fbbf24;font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;font-weight:600;margin-bottom:14px}
.hero-tx h1{color:#fff;margin-bottom:18px}
.lead{color:#cbd5e1;font-size:1.08rem;margin-bottom:26px;max-width:34em}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.hero .btn-ghost{color:#fff;border-color:#475569}
.hero .btn-ghost:hover{border-color:var(--accent);color:#fbbf24}
.hero-sub{color:#94a3b8;font-size:.86rem}
.hero-img img{border-radius:var(--r);box-shadow:0 24px 60px rgba(0,0,0,.45);width:100%;object-fit:cover;aspect-ratio:7/4}

/* trust bar */
.trust{background:var(--ink2);border-top:1px solid #2b3647;border-bottom:2px solid transparent;border-image:linear-gradient(90deg,transparent,rgba(194,114,46,.55),transparent) 1;box-shadow:0 14px 30px -18px rgba(0,0,0,.6)}
.trust-in{display:flex;align-items:center;gap:28px;padding:20px;flex-wrap:wrap;justify-content:center}
.trust-lb{color:#94a3b8;font-size:.8rem;letter-spacing:.06em;text-transform:uppercase}
.trust-logos{display:flex;gap:30px;list-style:none;flex-wrap:wrap;align-items:center}
.trust-logos img{filter:brightness(0) invert(1);opacity:.62;transition:.2s}
.trust-logos img:hover{opacity:1}

/* sections */
.sec{padding:clamp(56px,8vw,92px) 0}
.sec-alt{background:var(--bg-alt)}
.sec-h{text-align:center;max-width:42em;margin:0 auto 44px}
.sec-h h2{margin-bottom:12px}
.sec-h p{color:var(--tx-soft)}
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
/* center the lone 7th service card in a 3-col grid (no empty-right gap) */
.grid-3 > .card:last-child:nth-child(3n+1){grid-column:2}

/* service cards */
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(17,24,39,.12);border-color:#d6d3d1}
.card img{aspect-ratio:7/4;object-fit:cover;width:100%}
.card-b{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-b p{color:var(--tx-soft);font-size:.93rem;flex:1}
.more{color:var(--accent);font-weight:600;font-size:.9rem}

/* why / value props */
.vp{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:26px 22px;text-align:center}
.vp-i{width:48px;height:48px;border-radius:50%;background:rgba(194,114,46,.12);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:1.3rem;margin:0 auto 14px}
.vp p{color:var(--tx-soft);font-size:.92rem;margin-top:6px}

/* process */
.steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:s}
.steps li{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:28px 22px;position:relative}
.step-n{display:flex;width:42px;height:42px;border-radius:50%;background:var(--ink);color:#fff;align-items:center;justify-content:center;font-weight:700;margin-bottom:14px}
.steps p{color:var(--tx-soft);font-size:.93rem;margin-top:6px}

/* areas chips */
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.chips li{background:var(--white);border:1px solid var(--line);border-radius:999px;padding:9px 18px;font-size:.9rem;color:var(--ink);font-weight:500}

/* faq accordion */
.acc details{background:var(--white);border:1px solid var(--line);border-radius:var(--r-s);margin-bottom:12px;overflow:hidden}
.acc summary{padding:17px 20px;font-weight:600;color:var(--ink);cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.acc summary::-webkit-details-marker{display:none}
.acc summary::after{content:"+";color:var(--accent);font-size:1.3rem;font-weight:700}
.acc details[open] summary::after{content:"–"}
.acc details p{padding:0 20px 18px;color:var(--tx-soft);font-size:.95rem}

/* contact */
.sec-cta{background:linear-gradient(160deg,#1F2937,#111827);color:#fff}
.contact-in{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.contact-tx h2{color:#fff;margin-bottom:12px}
.contact-tx p{color:#cbd5e1;margin-bottom:20px}
.contact-list{list-style:none;display:flex;flex-direction:column;gap:10px;color:#e5e7eb}
.contact-list a{color:#fbbf24}
.contact-form{background:rgba(255,255,255,.04);border:1px solid #334155;border-radius:var(--r);padding:24px;display:flex;flex-direction:column;gap:14px}
.contact-form label{display:flex;flex-direction:column;gap:6px;font-size:.85rem;color:#cbd5e1}
.contact-form input,.contact-form select,.contact-form textarea{background:#0f172a;border:1px solid #334155;border-radius:var(--r-s);padding:11px 13px;color:#fff;font-family:inherit;font-size:.95rem}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.form-note{color:#94a3b8;font-size:.82rem;text-align:center}

/* footer */
.ft{background:#0b1120;color:#cbd5e1;padding:48px 0 22px}
.ft-in{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;padding-bottom:26px;border-bottom:1px solid #1e293b}
.ft-brand{max-width:32em;display:flex;gap:14px;align-items:flex-start}
.ft-brand p{font-size:.9rem;color:#94a3b8}
.ft-nav{display:flex;gap:20px;flex-wrap:wrap;font-size:.92rem;align-content:flex-start}
.ft-nav a:hover{color:var(--accent)}
.ft-bot{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-top:18px;font-size:.82rem;color:#64748b}

/* responsive */
@media(max-width:980px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .hero-in,.contact-in{grid-template-columns:1fr;gap:32px}
  .hero-img{order:-1}
  .steps{grid-template-columns:1fr}
}
@media(max-width:760px){
  .nav{position:fixed;inset:64px 0 auto 0;background:#111827;flex-direction:column;gap:0;padding:8px 20px 18px;margin:0;display:none;border-top:1px solid #1e293b}
  .nav.open{display:flex}
  .nav a{padding:13px 0;border-bottom:1px solid #1e293b}
  .burger{display:block}
  .nav{margin-left:0}
  .hdr-in{gap:10px}
  .brand{margin-right:auto}
  .grid-3{grid-template-columns:1fr}
  .grid-4{grid-template-columns:1fr}
  .tel span,.tel{font-size:.82rem}
  .trust{display:none}
}
@media(max-width:420px){
  .hero-in{padding:48px 20px}
  .lang button{padding:5px 8px}
  /* fix 16px mobile header row overflow: tighten CTA so brand+lang+tel+burger fit, burger stays fully tappable */
  .wrap{padding:0 14px}
  .hdr-in{gap:8px}
  .hdr-cta{gap:8px;min-width:0}
  .tel{padding:8px 10px;font-size:.76rem}
  .burger{font-size:1.5rem}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}