:root{
  --bg:#F3F6FB; --surface:#FFFFFF; --surface-2:#E8EEF8; --line:#CFD9EA;
  --text:#0D1630; --muted:#56637F; --accent:#2A6BF2; --accent-ink:#FFFFFF;
  --signal:#0E9F64; --busy:#2A6BF2; --cell:#DCE4F2;
  --sans:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0A1020; --surface:#111A30; --surface-2:#16213C; --line:#24304D;
    --text:#E8EEF9; --muted:#8D9AB8; --accent:#4D8DFF; --accent-ink:#06102A;
    --signal:#3DF5A6; --busy:#4D8DFF; --cell:#1A2542; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0A1020; --surface:#111A30; --surface-2:#16213C; --line:#24304D;
  --text:#E8EEF9; --muted:#8D9AB8; --accent:#4D8DFF; --accent-ink:#06102A;
  --signal:#3DF5A6; --busy:#4D8DFF; --cell:#1A2542; color-scheme:dark;
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-behavior:smooth;scroll-padding-top:calc(72px + env(safe-area-inset-top,0px))}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--bg)}
img{max-width:100%}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.num{font-family:var(--mono);font-feature-settings:"tnum"}
h1,h2,h3{line-height:1.25;margin:0;letter-spacing:-.02em}
h2{font-size:clamp(1.6rem,3.2vw,2.3rem);font-weight:700;max-width:22ch}
.lead{color:var(--muted);max-width:56ch;margin:14px 0 0}
section{padding:104px 0}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:inherit;font-weight:500;font-size:16px;padding:13px 22px;border-radius:10px;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:background .15s,border-color .15s}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{filter:brightness(1.08)}
.btn-ghost{border-color:var(--line);color:var(--text);background:transparent}
.btn-ghost:hover{border-color:var(--muted)}

/* nav */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-family:var(--mono);font-weight:600;font-size:18px;text-decoration:none;display:flex;align-items:center;gap:10px}
.logo-mark{display:grid;grid-template-columns:repeat(3,5px);gap:2px}
.logo-mark i{width:5px;height:5px;background:var(--accent);border-radius:1px}
.logo-mark i:nth-child(2n){opacity:.35}
.nav-links{display:flex;gap:28px;font-size:15px}
.nav-links a{text-decoration:none;color:var(--muted)}
.nav-links a:hover{color:var(--text)}
.nav .btn{padding:9px 16px;font-size:15px}
@media (max-width:760px){.nav-links{display:none}}

/* hero */
.hero{padding:72px 0 88px}
.hero .wrap{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(2.3rem,5.4vw,3.9rem);font-weight:700;letter-spacing:-.035em}
.hero p{font-size:19px;color:var(--muted);margin:20px 0 32px;max-width:34ch}
.hero-ctas{display:flex;gap:12px;flex-wrap:wrap}
.cluster{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px}
.cluster-head{display:flex;justify-content:space-between;align-items:baseline;font-size:14px;color:var(--muted);margin-bottom:16px}
.live{display:inline-flex;align-items:center;gap:8px}
.live::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--signal);box-shadow:0 0 0 0 var(--signal);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--signal) 60%,transparent)}70%{box-shadow:0 0 0 8px transparent}100%{box-shadow:0 0 0 0 transparent}}
.grid-cells{display:grid;grid-template-columns:repeat(16,1fr);gap:4px}
.grid-cells span{aspect-ratio:1;border-radius:3px;background:var(--cell);transition:background .6s}
.grid-cells span.busy{background:var(--busy)}
.grid-cells span.free{background:var(--signal)}
.cluster-foot{display:flex;gap:28px;margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
.cluster-foot div{font-size:13px;color:var(--muted)}
.cluster-foot strong{display:block;font-family:var(--mono);font-size:22px;color:var(--text);font-weight:600}
.legend{display:flex;gap:14px;font-size:12px;color:var(--muted)}
.legend i{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:5px;vertical-align:-1px}
@media (max-width:900px){.hero .wrap{grid-template-columns:1fr;gap:40px}}

/* trust */
.trust{padding:0 0 32px}
.trust .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px 40px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-top:24px;padding-bottom:24px}
.trust-label{font-size:14px;color:var(--muted)}
.logos{display:flex;flex-wrap:wrap;gap:12px 36px;font-weight:700;color:var(--muted);font-size:17px;opacity:.85}

/* problem */
.compare{display:grid;grid-template-columns:1fr 1fr;gap:0;margin-top:48px;border:1px solid var(--line);border-radius:16px;overflow:hidden}
.compare > div{padding:32px}
.compare .old{background:var(--surface-2)}
.compare .new{background:var(--surface)}
.compare h3{font-size:16px;font-weight:500;color:var(--muted);margin-bottom:20px}
.compare .new h3{color:var(--accent)}
.compare ul{list-style:none;margin:0;padding:0;display:grid;gap:16px}
.compare li{display:flex;justify-content:space-between;gap:16px;border-bottom:1px dashed var(--line);padding-bottom:12px}
.compare li:last-child{border:0;padding:0}
.compare li b{font-family:var(--mono);font-weight:600;white-space:nowrap}
.compare .old li b{color:var(--muted);font-weight:400}
@media (max-width:700px){.compare{grid-template-columns:1fr}}

/* pricing */
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px}
.plan{border:1px solid var(--line);border-radius:14px;padding:28px;background:var(--surface);display:flex;flex-direction:column}
.plan.featured{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.plan-top{display:flex;justify-content:space-between;align-items:center}
.plan h3{font-family:var(--mono);font-size:22px;font-weight:600}
.tag{font-size:12px;padding:3px 9px;border-radius:999px;background:var(--accent);color:var(--accent-ink)}
.price{font-family:var(--mono);font-size:34px;font-weight:600;margin:20px 0 2px}
.price small{font-size:15px;color:var(--muted);font-weight:400}
.plan dl{margin:20px 0 24px;display:grid;grid-template-columns:auto 1fr;gap:8px 16px;font-size:15px}
.plan dt{color:var(--muted)}
.plan dd{margin:0;text-align:right;font-family:var(--mono)}
.plan .use{font-size:15px;color:var(--muted);margin:0 0 24px;flex:1}
.plan .btn{width:100%}
@media (max-width:900px){.pricing-grid{grid-template-columns:1fr}}

/* calculator */
.calc{display:grid;grid-template-columns:1fr 1fr;gap:0;margin-top:48px;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--surface)}
.calc-in{padding:32px;display:grid;gap:28px}
.field label{display:flex;justify-content:space-between;font-size:15px;margin-bottom:10px}
.field label output{font-family:var(--mono);font-weight:600}
.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;background:var(--surface-2);padding:5px;border-radius:10px}
.seg button{font:inherit;font-family:var(--mono);font-size:14px;border:0;background:transparent;color:var(--muted);padding:9px 4px;border-radius:7px;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--text);box-shadow:0 1px 0 var(--line)}
input[type=range]{width:100%;accent-color:var(--accent)}
.calc-out{padding:32px;background:var(--surface-2);display:flex;flex-direction:column;justify-content:center}
.calc-out .k{font-size:14px;color:var(--muted)}
.calc-total{font-family:var(--mono);font-size:clamp(2rem,4.5vw,2.9rem);font-weight:600;margin:4px 0 20px;letter-spacing:-.02em}
.bars{display:grid;gap:10px;margin-bottom:20px}
.bar{display:grid;grid-template-columns:76px 1fr;align-items:center;gap:12px;font-size:13px;color:var(--muted)}
.bar div{height:10px;border-radius:5px;background:var(--line);overflow:hidden}
.bar div i{display:block;height:100%;background:var(--muted);transition:width .4s}
.bar.ours div i{background:var(--accent)}
.save{font-size:16px}
.save b{font-family:var(--mono);color:var(--signal)}
.note{font-size:13px;color:var(--muted);margin-top:14px}
@media (max-width:800px){.calc{grid-template-columns:1fr}}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-top:48px;counter-reset:s}
.step{border-top:2px solid var(--text);padding-top:20px}
.step-n{font-family:var(--mono);color:var(--accent);font-size:15px}
.step h3{font-size:20px;margin:8px 0 8px}
.step p{margin:0;color:var(--muted);font-size:16px}
@media (max-width:760px){.steps{grid-template-columns:1fr;gap:28px}}

/* dev */
.dev .wrap{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:center}
.feat{list-style:none;padding:0;margin:32px 0 0;display:grid;gap:22px}
.feat b{display:block;font-size:17px}
.feat span{color:var(--muted);font-size:16px}
.term{background:#0B1226;color:#D7E1F5;border-radius:14px;border:1px solid #24304D;font-family:var(--mono);font-size:14px;line-height:1.8;overflow:hidden}
.term-bar{display:flex;gap:6px;padding:12px 16px;border-bottom:1px solid #24304D}
.term-bar i{width:10px;height:10px;border-radius:50%;background:#2E3B5C}
.term pre{margin:0;padding:20px;overflow-x:auto;white-space:pre}
.term .c{color:#6F7FA3}.term .g{color:#3DF5A6}.term .b{color:#7FAEFF}
@media (max-width:900px){.dev .wrap{grid-template-columns:1fr}}

/* testimonials */
.quotes{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:20px;margin-top:48px}
.quote{border:1px solid var(--line);border-radius:14px;padding:28px;background:var(--surface);margin:0;display:flex;flex-direction:column}
.quote .metric{font-family:var(--mono);font-size:28px;font-weight:600;color:var(--accent)}
.quote .metric-l{font-size:14px;color:var(--muted);margin-bottom:18px}
.quote blockquote{margin:0 0 20px;flex:1}
.quote figcaption{font-size:14px;color:var(--muted)}
.quote figcaption b{color:var(--text);font-weight:500;display:block}
.quote:first-child blockquote{font-size:19px}
@media (max-width:900px){.quotes{grid-template-columns:1fr}}

/* faq */
.faq .wrap{display:grid;grid-template-columns:1fr 1.6fr;gap:56px}
.faq-list{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:22px 40px 22px 0;font-weight:500;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:18px;font-family:var(--mono);font-size:22px;color:var(--muted);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:0 0 22px;color:var(--muted);max-width:60ch}
@media (max-width:800px){.faq .wrap{grid-template-columns:1fr;gap:24px}}

/* final cta */
.final{padding:0 0 104px}
.final-box{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:56px;display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:center}
.final h2{font-size:clamp(1.8rem,3.6vw,2.6rem)}
.signup{display:grid;gap:12px}
.signup label{font-size:14px;color:var(--muted)}
.signup-row{display:flex;gap:8px}
.signup input{flex:1;min-width:0;font:inherit;font-size:16px;padding:13px 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--text)}
.signup input:focus{outline:2px solid var(--accent);outline-offset:1px}
.msg{font-size:14px;min-height:1.4em;margin:0}
.msg.ok{color:var(--signal)}.msg.err{color:#E5484D}
.sub-link{font-size:15px;color:var(--muted)}
@media (max-width:800px){.final-box{grid-template-columns:1fr;padding:32px 24px}.signup-row{flex-direction:column}}

footer{border-top:1px solid var(--line);padding:40px 0;font-size:14px;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px}
footer nav{display:flex;gap:24px}
footer a{text-decoration:none}
footer a:hover{color:var(--text)}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}