/* RAYDA TECH · v4 */
:root{
  --ink:#0A0C10; --ink-2:#141821; --paper:#FFFFFF; --paper-2:#F7F8FA;
  --muted:#6B7280; --muted-2:#9CA3AF; --line:#E5E7EB; --line-dark:#1F2430;
  --accent:#0891B2; --accent-2:#0E7490;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased;line-height:1.65}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 32px}
@media(max-width:640px){.wrap{padding:0 20px}}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{height:72px;display:flex;align-items:center;gap:32px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand img{width:28px;height:28px;border-radius:6px}
.brand-t{font-size:15px}
.brand-e{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--muted)}
.nav-links{margin-left:auto;display:flex;gap:28px;font-size:14px}
.nav-links a{color:var(--muted);padding:6px 0;border-bottom:1px solid transparent}
.nav-links a:hover,.nav-links a.is-active{color:var(--ink);border-bottom-color:var(--ink)}
.nav-cta{font-size:13px;padding:9px 16px;border:1px solid var(--ink);border-radius:2px;transition:.2s}
.nav-cta:hover{background:var(--ink);color:#fff}
@media(max-width:820px){.nav-links{display:none}.nav-cta{margin-left:auto}}

/* hero */
.hero{background:var(--ink);color:#fff;padding:120px 0 96px}
.hero .eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:#7DD3E8;margin:0 0 28px}
.hero h1{font-size:clamp(36px,4.6vw,60px);line-height:1.12;letter-spacing:-.02em;margin:0 0 24px;font-weight:700}
.hero h1 em{font-style:normal;color:#7DD3E8}
.hero p.lede{font-size:clamp(15px,1.4vw,18px);color:#A9B2C0;max-width:56ch;margin:0 0 40px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:64px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;font-size:14px;border:1px solid transparent;border-radius:2px;transition:.2s}
.btn-primary{background:#fff;color:var(--ink)}
.btn-primary:hover{background:#E6EAF0}
.btn-ghost{border-color:#39404E;color:#E7EDF5}
.btn-ghost:hover{border-color:#8A93A3}
.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line-dark);border:1px solid var(--line-dark)}
.metric{background:var(--ink);padding:24px 22px}
.metric-v{font-size:26px;font-weight:700;letter-spacing:-.01em}
.metric-l{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:#8B95A5;margin-top:6px}
@media(max-width:640px){.metrics{grid-template-columns:1fr}.hero{padding:80px 0 64px}}

/* section */
.sec{padding:96px 0;border-bottom:1px solid var(--line)}
.sec.alt{background:var(--paper-2)}
.sec-head{max-width:720px;margin-bottom:56px}
.sec-label{font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--muted);margin:0 0 16px}
.sec-title{font-size:clamp(24px,2.6vw,34px);line-height:1.25;letter-spacing:-.01em;margin:0 0 14px}
.sec-desc{color:var(--muted);margin:0;font-size:15px}
@media(max-width:640px){.sec{padding:64px 0}}

/* cards */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.card{background:#fff;padding:32px 28px}
.card-no{font-family:var(--mono);font-size:11px;color:var(--muted-2);letter-spacing:.1em}
.card h3{font-size:19px;margin:12px 0 10px;letter-spacing:-.01em}
.card p{color:var(--muted);font-size:14px;margin:0}
@media(max-width:760px){.grid-2{grid-template-columns:1fr}}

/* list rows */
.rows{border-top:1px solid var(--line)}
.row{display:grid;grid-template-columns:56px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--line)}
.row-no{font-family:var(--mono);font-size:11px;color:var(--muted-2);padding-top:4px}
.row-t{font-size:15px;font-weight:600;margin:0 0 4px}
.row-d{color:var(--muted);font-size:14px;margin:0}

/* work */
.work{border-top:1px solid var(--line)}
.work-item{padding:40px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:40px}
.work-meta{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--muted);margin-bottom:12px}
.work-item h3{font-size:22px;margin:0 0 16px;letter-spacing:-.01em}
.work-dl{margin:0}
.work-dl dt{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--muted-2);margin-top:14px}
.work-dl dd{margin:4px 0 0;color:#374151;font-size:14px}
.work-res{list-style:none;margin:0;padding:0}
.work-res li{font-size:14px;color:#111827;padding:8px 0;border-bottom:1px dashed var(--line)}
.work-res li:last-child{border-bottom:0}
@media(max-width:820px){.work-item{grid-template-columns:1fr;gap:20px}}

/* process */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.step{background:#fff;padding:26px 22px}
.step-no{font-family:var(--mono);font-size:11px;color:var(--muted-2)}
.step h3{font-size:16px;margin:10px 0 8px}
.step p{color:var(--muted);font-size:13px;margin:0 0 12px}
.step-dur{font-family:var(--mono);font-size:11px;color:var(--accent-2)}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.steps{grid-template-columns:1fr}}

/* about / legal */
.about-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:48px}
.about-p{color:#374151;font-size:15px;margin:0 0 16px}
.legal{border:1px solid var(--line);padding:24px;background:#fff}
.legal-row{display:flex;justify-content:space-between;gap:16px;font-size:13px;margin:0;padding:10px 0;border-bottom:1px dashed var(--line)}
.legal-row:last-child{border-bottom:0}
.legal-row span{color:var(--muted);font-family:var(--mono);font-size:11px;letter-spacing:.06em;flex:0 0 auto}
.legal-row-stack{flex-direction:column;align-items:flex-start;gap:4px;text-align:right}
.legal-row-stack>span:last-child{text-align:right}
@media(max-width:820px){.about-grid{grid-template-columns:1fr}}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.contact-list{margin:0;border-top:1px solid var(--line)}
.contact-list .row{grid-template-columns:120px 1fr}
.contact-qrs{display:flex;gap:28px}
.contact-qrs figure{margin:0;text-align:center}
.contact-qrs img{width:150px;height:auto;border:1px solid var(--line);padding:6px;background:#fff}
.contact-qrs figcaption{font-size:12px;color:var(--muted);margin-top:8px}
@media(max-width:820px){.contact-grid{grid-template-columns:1fr}}

/* faq */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-size:15px;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"＋";font-family:var(--mono);color:var(--muted-2);margin-right:10px}
.faq details[open] summary::before{content:"－"}
.faq p{color:var(--muted);font-size:14px;margin:10px 0 0 22px}

/* cta band */
.cta-band{background:var(--ink);color:#fff;padding:72px 0}
.cta-band h2{font-size:clamp(22px,2.4vw,30px);margin:0 0 12px;letter-spacing:-.01em}
.cta-band p{color:#A9B2C0;margin:0 0 28px;font-size:15px}

/* footer */
.footer{background:var(--ink);color:#C7CEDA;padding:64px 0 32px;font-size:13px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1.4fr 1fr;gap:32px;padding-bottom:40px;border-bottom:1px solid var(--line-dark)}
.footer-brand img{width:32px;height:32px;border-radius:6px;margin-bottom:14px}
.footer-name{font-weight:600;color:#fff;margin:0 0 10px}
.footer-name span{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:#7B8595;font-weight:400}
.footer-desc{color:#8B95A5;margin:0}
.footer-col h4{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:#7B8595;margin:0 0 14px;font-weight:500}
.footer-col a,.footer-col span{display:block;color:#C7CEDA;margin-bottom:8px}
.footer-col a:hover{color:#fff}
.footer-qrs{display:flex;gap:14px}
.footer-qrs figure{margin:0;text-align:center}
.footer-qrs img{width:96px;height:auto;background:#fff;padding:4px;border-radius:4px}
.footer-qrs figcaption{font-size:11px;color:#8B95A5;margin-top:6px}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:24px;color:#7B8595;font-size:12px}
.footer-bottom a{color:#8B95A5}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}

/* page hero (inner) */
.page-hero{padding:80px 0 56px;border-bottom:1px solid var(--line);background:var(--paper-2)}
.page-hero h1{font-size:clamp(30px,3.4vw,44px);letter-spacing:-.02em;margin:0 0 16px}
.page-hero p{color:var(--muted);max-width:64ch;margin:0;font-size:15px}

/* scroll anchor offset */
[id]{scroll-margin-top:88px}