/* 레퍼런스: fume-studio.com. 크림 바탕, 다크브라운, 세리프 제목. 템플릿 느낌(둥근 알약 버튼, 그라데이션 카드, 3열 박스) 피함 */
:root {
  --bg: #F6EFE0;
  --paper: #FBF8F1;
  --ink: #14191B;
  --muted: #5d5650;
  --brown: #442A19;
  --tan: #BF9F8D;
  --line: #e2d6c3;
  --tint: #EDE3D0;
  --display: "Cormorant Garamond", "Noto Serif KR", Georgia, serif;
  --serif: "Noto Serif KR", Georgia, serif;
  --sans: "Pretendard Variable", Pretendard, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 17px/1.75 var(--sans); word-break: keep-all; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 500; line-height: 1.3; letter-spacing: -.01em; margin: 0 0 .6em; }
h1 { font-size: clamp(2.4rem, 6vw, 4.6rem); color: var(--brown); }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
.wrap { width: min(1240px, 100% - 48px); margin-inline: auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 99; background: var(--ink); color: #fff; padding: 8px 14px; }

/* header */
.hd { position: sticky; top: 0; z-index: 20; background: rgb(246 239 224 / .92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.hd-in { display: flex; align-items: center; gap: 32px; height: 68px; }
.logo { font: 600 1.7rem/1 var(--display); letter-spacing: .16em; color: var(--brown); text-decoration: none; display: flex; align-items: baseline; gap: 10px; }
.logo small { font: 500 .72rem var(--sans); letter-spacing: .02em; color: var(--muted); }
.nav { display: flex; gap: 28px; margin-left: auto; }
.nav a { text-decoration: none; font-size: .95rem; padding: 4px 0; border-bottom: 1px solid transparent; }
.nav a:hover, .nav a[aria-current] { border-color: var(--brown); }
.hd-tel { font-weight: 600; font-size: .92rem; text-decoration: none; color: var(--bg); background: var(--brown); padding: 9px 18px; }
.hd-tel:hover { background: var(--ink); }
.crumbs { font-size: .85rem; color: var(--muted); padding-top: 18px; }
.crumbs a { text-decoration: none; }

/* buttons */
.cta-btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { display: inline-block; padding: 15px 26px; background: var(--brown); color: var(--bg); text-decoration: none; font-weight: 600; border: 1px solid var(--brown); transition: background .2s; }
.btn:hover { background: var(--ink); border-color: var(--ink); }
.btn.ghost { background: transparent; color: var(--brown); }
.btn.ghost:hover { background: var(--brown); color: var(--bg); }
.more { color: var(--brown); font-weight: 600; text-underline-offset: 4px; }

/* hero: 전면 사진 + 가운데 H1 / KOSIN / 영문 라벨 */
.hero { position: relative; min-height: calc(100svh - 68px); display: grid; place-items: center; text-align: center; color: #fff; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero::after { content: ""; position: absolute; inset: 0; background: rgb(20 25 27 / .42); }
.hero-in { position: relative; z-index: 1; width: min(860px, 100% - 40px); padding: 80px 0; }
.hero h1 { color: #fff; font-family: var(--serif); font-weight: 500; font-size: clamp(1.3rem, 2.4vw, 1.8rem); letter-spacing: .14em; margin: 0 0 6px; }
.hero-brand { font: 500 clamp(4rem, 12vw, 9.5rem)/1 var(--display); letter-spacing: .08em; margin: 0 0 14px; padding-left: .08em; text-shadow: 0 2px 30px rgb(0 0 0 / .25); }
.hero-en { font: 500 clamp(.9rem, 1.3vw, 1.05rem)/1.4 var(--display); text-transform: uppercase; font-variant-numeric: lining-nums; letter-spacing: .28em; margin: 0 0 26px; color: rgb(255 255 255 / .85); }
.hero-sub { color: rgb(255 255 255 / .88); font-size: 1.02rem; max-width: 640px; margin: 0 auto; }
.hero .cta-btns { justify-content: center; }
.btn.light { background: var(--bg); color: var(--ink); border-color: var(--bg); }
.btn.light:hover { background: #fff; border-color: #fff; }
.btn.ghost.light { background: transparent; color: #fff; border-color: rgb(255 255 255 / .7); }
.btn.ghost.light:hover { background: #fff; color: var(--ink); }
.lead { font-size: 1.12rem; color: var(--muted); max-width: 40em; }

/* sections */
.sec { padding: 72px 0; }
.wrap.sec { padding-inline: 0; }
.tint { background: var(--tint); }
.sec-hd { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.group-h { margin-top: 40px; font-size: 1.1rem; color: var(--brown); }
.note { font-size: .88rem; color: var(--muted); margin-top: 12px; }

.checks { list-style: none; padding: 0; margin: 0; }
.checks strong { display: block; font-family: var(--serif); font-weight: 600; color: var(--brown); margin-bottom: 4px; }
.checks li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.link-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px 26px; }
.link-list a { color: var(--brown); text-underline-offset: 4px; }

/* intro (메인) */
.intro { display: grid; grid-template-columns: 1fr 1.25fr; gap: 64px; align-items: start; }
.intro h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); color: var(--brown); }
.intro-txt > p { font-size: 1.05rem; }
.spec-list { margin: 36px 0 0; border-top: 1px solid var(--ink); }
.spec-list div { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.spec-list dt { font-weight: 600; color: var(--brown); }
.spec-list dd { margin: 0; color: var(--muted); }

/* table */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--paper); font-size: .98rem; }
caption { text-align: left; font-size: .88rem; color: var(--muted); padding-bottom: 12px; }
th, td { padding: 16px 18px; text-align: left; border-bottom: 1px solid var(--line); }
thead th { background: var(--brown); color: var(--bg); font-weight: 600; }
tbody th { font-weight: 600; white-space: nowrap; }
tbody th small { display: block; font-weight: 400; color: var(--muted); font-size: .8rem; }
.cost td { font-variant-numeric: tabular-nums; }
.spec { max-width: 720px; margin-bottom: 48px; }
.spec th { width: 120px; color: var(--brown); }

/* cards */
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px 28px; margin-top: 24px; }
.card { text-decoration: none; display: block; }
.card img { aspect-ratio: 4/5; object-fit: cover; width: 100%; transition: transform .5s ease; }
.card:hover img { transform: scale(1.02); }
.card-meta { display: block; font-size: .8rem; letter-spacing: .04em; color: var(--muted); margin-top: 14px; }
.card-title { margin: 4px 0 0; font-size: 1.12rem; }

.lgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 44px 28px; margin-top: 28px; }
.lcard { display: block; text-decoration: none; }
.lcard-img { display: block; overflow: hidden; }
.lcard img { width: 100%; aspect-ratio: 5/4; object-fit: cover; transition: transform .6s ease; }
.lcard:hover img { transform: scale(1.03); }
.lcard h3 { font-size: 1.2rem; margin: 16px 0 4px; }
.lcard:hover h3 { text-decoration: underline; text-underline-offset: 4px; }
.lcard-sum { font-size: .92rem; color: var(--muted); }

/* 시공사례 크기 섞기: 첫 장 크게 */
.works-mix { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 36px 24px; margin-top: 24px; }
.works-mix .card:first-child { grid-row: span 2; }
.works-mix .card:first-child img { aspect-ratio: auto; height: calc(100% - 64px); min-height: 420px; }
.works-mix .card img { aspect-ratio: 1; }

/* 일하는 방식 */
.how { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
.how-img { margin: 0; }
.how-img img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.how-img figcaption { font-size: .85rem; color: var(--muted); margin-top: 10px; }
.how-list { list-style: none; counter-reset: how; padding: 0; margin: 28px 0 0; }
.how-list li { counter-increment: how; position: relative; padding: 22px 0 22px 56px; border-top: 1px solid var(--line); }
.how-list li::before { content: counter(how); position: absolute; left: 0; top: 16px; font: 500 2.2rem/1 var(--display); color: var(--tan); font-variant-numeric: lining-nums; }
.how-list p { color: var(--muted); margin: 0; }

/* 진행 순서: 행 목록 */
.steps { list-style: none; padding: 0; margin: 24px 0 0; border-top: 1px solid var(--ink); }
.steps li { display: grid; grid-template-columns: 48px 180px 1fr 140px; gap: 20px; align-items: baseline; padding: 18px 0; border-bottom: 1px solid var(--line); }
.step-no { font: 500 1.5rem/1 var(--display); color: var(--tan); font-variant-numeric: lining-nums; }
.steps h3 { margin: 0; font-size: 1.08rem; }
.steps p { color: var(--muted); font-size: .95rem; margin: 0; }
.step-time { font-size: .9rem; font-weight: 600; color: var(--brown); text-align: right; }

/* faq */
.faq { border-top: 1px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 22px 40px 22px 0; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 18px; font: 300 1.6rem var(--sans); color: var(--brown); }
.faq details[open] summary::after { content: "−"; }
.faq summary h3 { margin: 0; font-size: 1.12rem; }
.faq details p { color: var(--muted); padding-bottom: 22px; margin: 0; max-width: 54em; }

/* gallery */
.gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 56px; }
.gallery figure { margin: 0; }
.gallery figure:first-child { grid-column: 1 / -1; }
.gallery img { width: 100%; }
.gallery figcaption { font-size: .85rem; color: var(--muted); margin-top: 8px; }
article.sec section { margin-top: 56px; }

/* cta */
.cta { background: var(--ink); color: var(--bg); text-align: center; padding: 96px 24px; }
.cta h2 { color: var(--bg); }
.cta p { color: #cfc6b8; max-width: 36em; margin-inline: auto; }
.cta .cta-btns { justify-content: center; }
.cta .btn { background: var(--bg); color: var(--ink); border-color: var(--bg); }
.cta .btn.ghost { background: transparent; color: var(--bg); }

/* footer */
.ft { background: var(--brown); color: #e9dfcf; padding: 64px 0 28px; font-size: .9rem; }
.ft-in { display: grid; grid-template-columns: 1fr 1.4fr; gap: 48px; }
.ft-logo { font: 600 1.9rem var(--display); letter-spacing: .14em; color: var(--bg); }
.ft-tel a { font: 600 1.4rem var(--sans); color: var(--bg); text-decoration: none; }
.ft-biz { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.ft-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; border-top: 1px solid rgb(255 255 255 / .15); margin-top: 40px; padding-top: 20px; font-size: .82rem; color: var(--tan); }
.ft-links { grid-column: 1 / -1; list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.ft-links a { color: var(--bg); text-decoration: none; border-bottom: 1px solid rgb(255 255 255 / .3); }
.contact-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 28px; margin: 36px 0 16px; }
.contact-box { background: var(--paper); padding: 36px; margin: 0 !important; }
.contact-box.dark { background: var(--brown); color: var(--bg); align-self: start; }
.contact-box.dark h2 { color: var(--bg); }
.call-no { font: 500 clamp(2rem, 4vw, 2.8rem)/1.2 var(--display); font-variant-numeric: lining-nums; letter-spacing: .02em; margin: 8px 0; }
.call-info { list-style: none; padding: 0; margin: 28px 0 0; font-size: .88rem; color: #e1d5c2; }
#sms-form { display: grid; gap: 14px; margin-top: 18px; }
#sms-form label { display: grid; gap: 6px; font-size: .9rem; font-weight: 600; }
#sms-form input, #sms-form select, #sms-form textarea { font: 400 1rem var(--sans); padding: 12px 14px; border: 1px solid var(--line); border-radius: 0; background: #fff; color: var(--ink); }
#sms-form input:focus, #sms-form select:focus, #sms-form textarea:focus { outline: 2px solid var(--tan); border-color: var(--tan); }
#sms-form .btn { justify-self: start; cursor: pointer; font: 600 1rem var(--sans); }
.form-err { color: #8B0000; font-size: .9rem; margin: 0; }
.sms-fallback { margin-top: 20px; font-size: .9rem; }
.sms-fallback pre { white-space: pre-wrap; background: var(--tint); padding: 14px; border-radius: 4px; font: 400 .9rem var(--sans); }
.fab { display: none; }

@media (max-width: 900px) {
  .ft-in, .contact-grid, .intro, .how { grid-template-columns: 1fr; gap: 32px; }
  .grid3, .lgrid, .works-mix { grid-template-columns: 1fr 1fr; }
  .works-mix .card:first-child { grid-column: 1 / -1; grid-row: auto; }
  .works-mix .card:first-child img { height: auto; min-height: 0; aspect-ratio: 16/10; }
  .steps li { grid-template-columns: 40px 1fr; gap: 4px 14px; }
  .steps p, .step-time { grid-column: 2; text-align: left; }
  .hd-in { flex-wrap: wrap; height: auto; padding: 14px 0 0; gap: 10px 20px; }
  .hd-tel { margin-left: auto; }
  .nav { order: 3; width: 100%; margin: 0; gap: 22px; overflow-x: auto; padding-bottom: 10px; white-space: nowrap; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .wrap { width: calc(100% - 36px); }
  .hero { min-height: 88svh; }
  .hero-sub { font-size: .95rem; }
  .sec { padding: 52px 0; }
  .grid3, .gallery, .lgrid, .works-mix { grid-template-columns: 1fr; }
  .fab { display: block; position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 30; text-align: center; padding: 15px; background: var(--brown); color: var(--bg); font-weight: 700; text-decoration: none; box-shadow: 0 6px 18px rgb(0 0 0 / .18); }
  .ft { padding-bottom: 96px; }
}