/* 냉방 설계실 — COOLING DESIGN STUDIO · MODEL AC-011 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--paper:#e9f3fa;--panel:#ffffff;--well:#f2f9fd;--ink:#0d2b3e;--sub:#4d6879;--dim:#7f97a6;--line:#cfe2ef;--line2:#b6d4e6;--accent:#0a86c8;--accent2:#0b6ea6;--deep:#064a70;--frost1:#d6eefb;--frost2:#eefbff;--mint:#12a596;--warn:#d9741f;--warnbg:#fff4e6;--warnline:#f0d3a8;--mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,monospace;--sans:'IBM Plex Sans KR',-apple-system,BlinkMacSystemFont,sans-serif}
html{color-scheme:light}
body{font-family:var(--sans);font-weight:400;background-color:var(--paper);background-image:linear-gradient(rgba(120,170,200,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(120,170,200,.10) 1px,transparent 1px),linear-gradient(rgba(96,150,185,.16) 1px,transparent 1px),linear-gradient(90deg,rgba(96,150,185,.16) 1px,transparent 1px);background-size:24px 24px,24px 24px,120px 120px,120px 120px;color:var(--ink);line-height:1.7;-webkit-font-smoothing:antialiased}
::selection{background:var(--accent);color:#fff}
a{color:var(--accent2)}
.container{max-width:820px;margin:0 auto;padding:0 20px}
.wide{max-width:1120px}
.top-nav{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;padding:14px 20px;max-width:1120px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:700;font-size:15px;letter-spacing:-.01em}
.brand>svg{color:var(--accent);flex-shrink:0}
.model-tag{font-family:var(--mono);font-size:9.5px;font-weight:500;letter-spacing:1.5px;color:var(--dim);border:1px solid var(--line2);border-radius:3px;padding:2px 6px;background:#fff}
.nav-links{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.nav-links a{color:var(--sub);text-decoration:none;font-size:13px;font-weight:500;letter-spacing:.2px;padding:6px 11px;border-radius:4px;border:1px solid transparent;transition:color .15s,background-color .15s,border-color .15s}
.nav-links a:hover{color:var(--accent2);background:#fff;border-color:var(--line)}
.nav-links a.cta{color:#fff;background:var(--accent);border-color:var(--accent)}
.nav-links a.cta:hover{background:var(--accent2);color:#fff}
.ruler-strip{height:22px;border-top:1px solid var(--line2);border-bottom:1px solid var(--line2);background-color:#f4fafd;background-image:repeating-linear-gradient(90deg,var(--line2) 0 1px,transparent 1px 8px),repeating-linear-gradient(90deg,#8fb9d4 0 1px,transparent 1px 40px);background-size:100% 7px,100% 13px;background-position:0 100%;background-repeat:repeat-x}
.hero{padding:40px 0 14px}
.eyebrow{font-family:var(--mono);font-size:10.5px;font-weight:500;letter-spacing:2.5px;color:var(--accent2);margin-bottom:12px;text-transform:uppercase}
h1{font-size:clamp(1.55rem,4vw,2.15rem);font-weight:700;letter-spacing:-.02em;line-height:1.28;margin-bottom:12px}
.hero-lede{color:var(--sub);font-size:15.5px;max-width:660px}
.hero-lede b{color:var(--accent2);font-weight:600}
section{margin-bottom:26px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:0 1px 0 rgba(255,255,255,.6) inset,0 10px 26px rgba(20,70,100,.07);overflow:hidden}
.panel-head{display:flex;align-items:center;gap:9px;padding:14px 20px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,#f7fcfe,#eef7fc)}
.panel-head .stud{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px rgba(10,134,200,.15)}
.panel-head h2{font-size:14.5px;font-weight:600;letter-spacing:-.01em}
.panel-head .tag{font-family:var(--mono);font-size:10px;color:var(--dim);margin-left:auto;letter-spacing:1px}
.calc-body{padding:20px}
.mode-toggle{display:flex;gap:0;border:1px solid var(--line2);border-radius:8px;overflow:hidden;margin-bottom:18px;background:var(--well)}
.mode-toggle button{flex:1;border:0;background:transparent;padding:11px 8px;font-family:var(--sans);font-size:13.5px;font-weight:600;color:var(--sub);cursor:pointer;transition:background .15s,color .15s;line-height:1.35}
.mode-toggle button small{display:block;font-weight:400;font-size:11px;color:var(--dim);margin-top:2px}
.mode-toggle button.active{background:var(--accent);color:#fff}
.mode-toggle button.active small{color:#dcefff}
.field-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.field{display:flex;flex-direction:column;gap:6px}
.field.col-2{grid-column:1/-1}
.field label{font-family:var(--mono);font-size:10.5px;font-weight:500;letter-spacing:1px;color:var(--sub);text-transform:uppercase}
.field .hint{font-size:11.5px;color:var(--dim);font-family:var(--sans);letter-spacing:0;text-transform:none}
.input-row{display:flex;gap:8px}
input[type=number],select{width:100%;font-family:var(--sans);font-size:15px;color:var(--ink);background:var(--well);border:1px solid var(--line2);border-radius:7px;padding:11px 12px;transition:border-color .15s,box-shadow .15s}
input[type=number]{font-family:var(--mono);font-weight:500}
input[type=number]:focus,select:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px rgba(10,134,200,.14);background:#fff}
select:disabled,input:disabled{opacity:.5;cursor:not-allowed}
.unit-sel{max-width:96px;flex:0 0 auto}
.checks{display:flex;flex-wrap:wrap;gap:8px}
.chk{display:flex;align-items:center;gap:7px;border:1px solid var(--line2);border-radius:7px;padding:9px 12px;background:var(--well);cursor:pointer;font-size:13px;font-weight:500;color:var(--sub);transition:all .15s;user-select:none}
.chk input{accent-color:var(--accent);width:15px;height:15px}
.chk:has(input:checked){border-color:var(--accent);background:#e7f5fd;color:var(--accent2)}
.result{margin-top:20px;border:1px solid var(--line2);border-radius:10px;background:linear-gradient(160deg,var(--frost1),var(--frost2));overflow:hidden;position:relative}
.result::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(120,170,200,.16) 1px,transparent 1px),linear-gradient(90deg,rgba(120,170,200,.16) 1px,transparent 1px);background-size:22px 22px;pointer-events:none;opacity:.6}
.result-inner{position:relative;padding:20px}
.rec-head{display:flex;align-items:baseline;flex-wrap:wrap;gap:8px;margin-bottom:4px}
.rec-badge{font-family:var(--mono);font-size:10px;letter-spacing:1.5px;color:#fff;background:var(--accent);padding:3px 8px;border-radius:4px;text-transform:uppercase}
.rec-main{font-size:clamp(1.7rem,6vw,2.3rem);font-weight:700;letter-spacing:-.02em;color:var(--deep);line-height:1.1}
.rec-main .u{font-size:.5em;font-weight:600;color:var(--accent2);margin-left:4px}
.rec-sub{font-size:13.5px;color:var(--sub);margin-bottom:16px}
.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:16px}
.metric{background:rgba(255,255,255,.72);border:1px solid var(--line);border-radius:8px;padding:12px 10px;text-align:center}
.metric .k{font-family:var(--mono);font-size:9.5px;letter-spacing:1px;color:var(--dim);text-transform:uppercase;margin-bottom:5px}
.metric .v{font-family:var(--mono);font-size:19px;font-weight:600;color:var(--ink);line-height:1.1}
.metric .v small{font-size:11px;color:var(--sub);font-weight:500}
.alt-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.alt{flex:1;min-width:130px;background:rgba(255,255,255,.55);border:1px dashed var(--line2);border-radius:8px;padding:10px 12px}
.alt .k{font-size:11px;color:var(--dim);margin-bottom:2px}
.alt .v{font-weight:600;color:var(--ink);font-size:14.5px}
.alt.warnstyle .v{color:var(--warn)}
.cp-links{display:flex;flex-direction:column;gap:9px;margin-bottom:6px}
.cp-link{display:flex;align-items:center;justify-content:center;gap:8px;background:var(--accent);color:#fff;text-decoration:none;font-weight:600;font-size:14.5px;padding:13px 16px;border-radius:8px;border:1px solid var(--accent2);box-shadow:0 3px 10px rgba(10,134,200,.25);transition:transform .12s,background .15s}
.cp-link:hover{background:var(--accent2);transform:translateY(-1px)}
.cp-link.sec{background:#fff;color:var(--accent2);box-shadow:none}
.cp-link.sec:hover{background:#eaf6fd}
.cp-note{font-size:11px;color:var(--dim);text-align:center;margin-bottom:4px}
.warnbox{margin-top:14px;display:flex;flex-direction:column;gap:8px}
.warn-item{display:flex;gap:9px;align-items:flex-start;background:var(--warnbg);border:1px solid var(--warnline);border-left:3px solid var(--warn);border-radius:7px;padding:10px 12px;font-size:13px;color:#7a4a12;line-height:1.6}
.warn-item svg{flex:0 0 auto;margin-top:2px;color:var(--warn)}
.disclaimer-inline{margin-top:12px;font-size:12px;color:var(--sub);line-height:1.65;border-top:1px dotted var(--line2);padding-top:12px}
.prose{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:26px 24px;box-shadow:0 8px 22px rgba(20,70,100,.06)}
.prose h2{font-size:1.22rem;font-weight:700;letter-spacing:-.015em;margin:30px 0 12px;padding-bottom:9px;border-bottom:2px solid var(--line2);color:var(--deep)}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:1.03rem;font-weight:600;margin:22px 0 8px;color:var(--accent2)}
.prose p{color:#26424f;font-size:14.5px;line-height:1.9;margin-bottom:13px}
.prose ul,.prose ol{color:#26424f;font-size:14.5px;line-height:1.9;padding-left:22px;margin-bottom:13px}
.prose li{margin-bottom:6px}
.prose strong{color:var(--deep);font-weight:600}
.prose a{color:var(--accent2);font-weight:500}
.prose .src{font-size:12px;color:var(--dim);line-height:1.7}
.callout{display:flex;gap:12px;align-items:flex-start;background:linear-gradient(160deg,var(--frost1),var(--frost2));border:1px solid var(--line2);border-radius:9px;padding:16px 18px;margin:16px 0}
.callout svg{flex:0 0 auto;color:var(--accent);margin-top:2px}
.callout .ct{font-size:13.5px;color:#234350;line-height:1.75}
.callout .ct b{color:var(--deep)}
.cta-row{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}
.btn{display:inline-flex;align-items:center;gap:7px;text-decoration:none;font-weight:600;font-size:14px;padding:12px 18px;border-radius:8px;transition:transform .12s,background .15s}
.btn-primary{background:var(--accent);color:#fff;border:1px solid var(--accent2);box-shadow:0 3px 10px rgba(10,134,200,.22)}
.btn-primary:hover{background:var(--accent2);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--accent2);border:1px solid var(--line2)}
.btn-ghost:hover{background:#eaf6fd}
details.calc-basis{margin-top:18px;border:1px solid var(--line2);border-radius:9px;background:var(--well);overflow:hidden}
details.calc-basis>summary{cursor:pointer;padding:14px 18px;font-weight:600;font-size:14px;color:var(--accent2);list-style:none;display:flex;align-items:center;gap:8px}
details.calc-basis>summary::-webkit-details-marker{display:none}
details.calc-basis>summary::before{content:"+";font-family:var(--mono);font-size:17px;color:var(--accent)}
details.calc-basis[open]>summary::before{content:"–"}
details.calc-basis .db{padding:0 18px 18px;font-size:13.5px;color:#2b4652;line-height:1.85}
.spec-table{width:100%;border-collapse:collapse;font-size:13px;margin:6px 0 4px}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.spec-table th,.spec-table td{border:1px solid var(--line2);padding:8px 10px;text-align:center;font-family:var(--mono)}
.spec-table th{background:#e6f3fb;font-weight:600;color:var(--deep);font-size:11.5px;letter-spacing:.5px}
.spec-table td:first-child,.spec-table th:first-child{font-family:var(--sans);font-weight:600}
.spec-table tbody tr:nth-child(even){background:#f6fbfe}
.linkcards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.linkcard{display:block;text-decoration:none;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:18px;transition:transform .12s,border-color .15s,box-shadow .15s}
.linkcard:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 10px 22px rgba(10,134,200,.12)}
.linkcard .lc-tag{font-family:var(--mono);font-size:9.5px;letter-spacing:1.5px;color:var(--accent);text-transform:uppercase}
.linkcard h3{font-size:15px;font-weight:700;color:var(--ink);margin:6px 0 5px}
.linkcard p{font-size:12.5px;color:var(--sub);line-height:1.6}
.faq-block details{background:var(--panel);border:1px solid var(--line);border-radius:9px;margin-bottom:10px;overflow:hidden}
.faq-block summary{cursor:pointer;padding:15px 18px;font-weight:600;font-size:14.5px;color:var(--ink);list-style:none;display:flex;gap:10px;align-items:flex-start}
.faq-block summary::-webkit-details-marker{display:none}
.faq-block summary .q{font-family:var(--mono);color:var(--accent);flex:0 0 auto}
.faq-block .fa{padding:0 18px 16px 40px;font-size:13.5px;color:#2b4652;line-height:1.85}
.faq-block .fa a{color:var(--accent2);font-weight:500}
.faq-block .fa strong{color:var(--deep)}
.section-title{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.section-title h2{font-size:1.25rem;font-weight:700;letter-spacing:-.015em;color:var(--deep)}
.section-title .ln{flex:1;height:1px;background:var(--line2)}
.section-title .num{font-family:var(--mono);font-size:11px;color:var(--accent);border:1px solid var(--line2);border-radius:4px;padding:2px 7px}
.page-header{padding:40px 0 8px}
.page-header .eyebrow{margin-bottom:10px}
.page-header p.sub{color:var(--sub);font-size:15px;max-width:660px;margin-top:8px}
footer{border-top:1px solid var(--line2);background:#fff;padding:34px 0 26px;margin-top:50px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:24px;margin-bottom:24px}
.footer-col h4{font-family:var(--mono);font-size:10px;font-weight:500;color:var(--dim);text-transform:uppercase;letter-spacing:2px;margin-bottom:12px}
.footer-col a{display:block;color:var(--sub);text-decoration:none;font-size:13px;padding:3px 0;transition:color .15s}
.footer-col a:hover{color:var(--accent2)}
.footer-bottom{border-top:1px solid var(--line);padding-top:16px;text-align:center;font-size:12px;color:var(--dim)}
.footer-plate{font-family:var(--mono);font-size:10px;font-weight:500;letter-spacing:2px;color:var(--dim);margin-top:6px}
.footer-plate a{color:var(--sub);text-decoration:none;border-bottom:1px dotted var(--line2)}
.footer-plate a:hover{color:var(--accent)}
.conv-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.conv-cell{display:flex;flex-direction:column;gap:6px}
.conv-cell label{font-family:var(--mono);font-size:10px;letter-spacing:1px;color:var(--sub);text-transform:uppercase}
.conv-cell input{width:100%;font-family:var(--mono);font-weight:500;font-size:15px;color:var(--ink);background:var(--well);border:1px solid var(--line2);border-radius:7px;padding:11px 12px}
.conv-cell input:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px rgba(10,134,200,.14);background:#fff}
.conv-cell.hl input{background:#e7f5fd;border-color:var(--accent)}
@media (max-width:640px){.field-grid{grid-template-columns:1fr}.metrics{grid-template-columns:1fr}.metric{display:flex;align-items:center;justify-content:space-between;text-align:left}.metric .k{margin-bottom:0}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition-duration:0ms!important;animation-duration:0ms!important}}