/* 고강이엔지 사이트와 같은 색·글꼴 */
:root {
  --brand: #2f78ad; --brand-dark: #1d4f74; --brand-ink: #123247; --brand-soft: #eaf3fa;
  --accent: #f2a01d;
  --ink: #1b1f24; --ink-2: #4a525c; --ink-3: #7a838e; --line: #e3e7ec;
  --bg: #fff; --bg-2: #f6f8fa; --radius: 10px; --max: 1180px;
  --font: "Pretendard Variable", Pretendard, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg); line-height: 1.6; word-break: keep-all; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; line-height: 1.3; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 820px; }

/* 버튼 */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 14px 24px; border-radius: 999px; font-weight: 700; font-size: 16px; border: 1.5px solid transparent; cursor: pointer; font-family: inherit; transition: .15s; }
.btn-pri { background: var(--brand); color: #fff; }
.btn-pri:hover { background: var(--brand-dark); }
.btn-ghost { border-color: rgba(255,255,255,.6); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); }
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-block { width: 100%; justify-content: center; }

/* 헤더 */
.hd { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.95); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.hd-in { display: flex; align-items: center; height: 64px; gap: 32px; }
.logo { display: flex; align-items: baseline; gap: 4px; font-size: 22px; }
.logo b { color: var(--brand); font-weight: 900; letter-spacing: -.5px; }
.logo span { font-weight: 800; color: var(--ink); font-size: 18px; }
.gnb { display: flex; gap: 28px; margin-left: auto; font-size: 15px; font-weight: 600; color: var(--ink-2); }
.gnb a:hover { color: var(--brand); }

/* 히어로 */
.hero { position: relative; color: #fff; padding: 120px 0 56px;
  background:
    linear-gradient(100deg, rgba(18,50,71,.96) 30%, rgba(18,50,71,.55)),
    repeating-linear-gradient(135deg, #2a3a47 0 2px, transparent 2px 22px),
    linear-gradient(160deg, #3d5a70, #16232e); }
.hero h1 { font-size: clamp(32px, 5vw, 52px); font-weight: 800; margin: 12px 0 18px; }
.lead { font-size: 18px; max-width: 620px; color: rgba(255,255,255,.85); margin: 0 0 32px; }
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-facts { list-style: none; margin: 72px 0 0; padding: 24px 0 0; border-top: 1px solid rgba(255,255,255,.2); display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; font-size: 14px; color: rgba(255,255,255,.7); }
.hero-facts b { display: block; color: #fff; font-size: 17px; }
.eyebrow { margin: 0 0 8px; font-size: 13px; font-weight: 800; letter-spacing: 1.5px; color: var(--brand); }
.hero .eyebrow, .sec-dark .eyebrow { color: var(--accent); }

/* 섹션 */
.sec { padding: 96px 0; }
.sec h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; margin-bottom: 40px; }
.sec .sub { color: var(--ink-2); font-size: 17px; max-width: 640px; margin: -24px 0 40px; }
.sec-gray { background: var(--bg-2); }
.sec-dark { background: var(--brand-ink); color: #fff; }
.sec-dark .sub { color: rgba(255,255,255,.75); }
.sec-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; margin-bottom: 32px; }
.sec-head h2 { margin: 0; }
.more { color: var(--brand); font-weight: 700; }
.empty { color: var(--ink-3); grid-column: 1 / -1; padding: 40px 0; text-align: center; margin: 0; }

.grid3, .grid4 { display: grid; gap: 20px; }
.grid3 { grid-template-columns: repeat(3, 1fr); }
.grid4 { grid-template-columns: repeat(4, 1fr); }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }

.svc { padding: 28px 24px; }
.svc .num { color: var(--brand); font-weight: 800; font-size: 14px; }
.svc h3 { font-size: 21px; margin: 8px 0 10px; }
.svc p { margin: 0; color: var(--ink-2); font-size: 15px; }
.banner { margin-top: 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 24px; border-radius: var(--radius); background: var(--brand-soft); color: var(--brand-ink); }
.banner b { color: var(--brand-dark); margin-right: 6px; }

.why { border-top: 2px solid var(--accent); padding-top: 20px; }
.why h3 { font-size: 19px; margin-bottom: 8px; }
.why p { margin: 0; color: rgba(255,255,255,.75); font-size: 15px; }

/* 시공사례 */
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tabs button { border: 1px solid var(--line); background: #fff; padding: 8px 16px; border-radius: 999px; font: 600 14px var(--font); color: var(--ink-2); cursor: pointer; }
.tabs button.on { background: var(--brand); border-color: var(--brand); color: #fff; }
a.card { display: block; transition: .15s; }
a.card:hover { border-color: var(--brand); }
.case .ph { aspect-ratio: 4/3; background: repeating-linear-gradient(135deg, #e9edf1 0 10px, #f3f5f7 10px 20px); display: grid; place-items: center; color: var(--ink-3); font-size: 14px; }
.case .ph img { width: 100%; height: 100%; object-fit: cover; }
.case-body { padding: 20px; }
.tag { margin: 0 0 6px; font-size: 13px; font-weight: 700; color: var(--brand); }
.case h3, .post h3 { font-size: 18px; margin-bottom: 8px; }
.case-body p:not(.tag):not(.meta) { margin: 0 0 12px; color: var(--ink-2); font-size: 15px; }
.meta { margin: 0; font-size: 13px; color: var(--ink-3); }

/* 쇼츠·블로그 */
.shorts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.short { position: relative; aspect-ratio: 9/16; width: 100%; border: 0; border-radius: var(--radius); background: #1b1f24 center/cover; cursor: pointer; overflow: hidden; padding: 0; }
.short .play { position: absolute; inset: 0; display: grid; place-items: center; font-size: 40px; color: #fff; text-shadow: 0 2px 12px rgba(0,0,0,.5); }
.short .st { position: absolute; left: 0; right: 0; bottom: 0; padding: 40px 14px 14px; background: linear-gradient(transparent, rgba(0,0,0,.75)); color: #fff; font: 700 15px var(--font); text-align: left; }
.post { padding: 24px; display: block; transition: .15s; }
.post:hover { border-color: var(--brand); }

/* 진행순서 */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; counter-reset: s; }
.steps li { counter-increment: s; background: var(--bg-2); border-radius: var(--radius); padding: 24px 20px; color: var(--ink-2); font-size: 15px; }
.steps li::before { content: "0" counter(s); display: block; color: var(--brand); font-weight: 800; font-size: 14px; margin-bottom: 6px; }
.steps b { display: block; color: var(--ink); font-size: 18px; margin-bottom: 4px; }

/* FAQ */
details { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 10px; }
summary { padding: 18px 22px; font-weight: 700; font-size: 17px; cursor: pointer; list-style: none; display: flex; justify-content: space-between; }
summary::after { content: "+"; color: var(--brand); font-size: 22px; line-height: 1; }
details[open] summary::after { content: "−"; }
details p { margin: 0; padding: 0 22px 20px; color: var(--ink-2); }

/* 견적신청 */
.quote { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; align-items: start; }
.form { background: #fff; color: var(--ink); border-radius: 14px; padding: 28px; display: grid; gap: 14px; }
.form label { display: grid; gap: 6px; font-size: 14px; font-weight: 700; color: var(--ink-2); }
.form input, .form select, .form textarea { font: 16px var(--font); padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink); width: 100%; }
.form input:focus, .form select:focus, .form textarea:focus { outline: 2px solid var(--brand); border-color: transparent; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form .chk { display: flex; align-items: center; gap: 8px; font-weight: 500; }
.form .chk input { width: 18px; height: 18px; }
.form-msg { margin: 0; font-size: 14px; color: var(--brand-dark); font-weight: 600; min-height: 1em; }

/* 시공사례 글 (case.html) */
.article h1 { font-size: clamp(24px, 3.2vw, 32px); font-weight: 800; margin-bottom: 14px; }
.article .lead-sm { font-size: 17px; color: var(--ink-2); margin: 0 0 24px; }
.article h2 { font-size: 21px; margin: 36px 0 10px; }
.article p { font-size: 16.5px; line-height: 1.85; margin: 0 0 12px; }
.article figure { margin: 20px 0; }
.article figure img { width: 100%; border-radius: var(--radius); display: block; }
.article figcaption { font-size: 14px; color: var(--ink-3); margin-top: 6px; }
.article .tags { color: var(--brand); font-size: 14px; margin-top: 28px; }
.article .cta { margin-top: 36px; }
.price-box { display: grid; gap: 2px; background: var(--brand-ink); color: #fff; border-radius: var(--radius); padding: 18px 22px; margin-bottom: 28px; }
.price-box span { font-size: 13px; color: rgba(255,255,255,.7); font-weight: 700; }
.price-box b { font-size: 26px; color: var(--accent); }
.price-box small { font-size: 13px; color: rgba(255,255,255,.65); }

.ft { background: #0e2433; color: rgba(255,255,255,.6); padding: 40px 0 100px; font-size: 14px; }
.ft p { margin: 4px 0; }
.ft .logo { margin-bottom: 12px; }
.ft .logo span { color: #fff; }
.copy { margin-top: 16px !important; font-size: 12px; }

.mbar { display: none; }

/* 태블릿 */
@media (max-width: 960px) {
  .gnb { display: none; }
  .hd-in { justify-content: space-between; }
  .grid4 { grid-template-columns: repeat(2, 1fr); }
  .grid3 { grid-template-columns: repeat(2, 1fr); }
  .shorts { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .quote { grid-template-columns: 1fr; gap: 32px; }
  .hero-facts { grid-template-columns: repeat(2, 1fr); }
}
/* 폰 */
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  .hd .btn { display: none; }
  .hero { padding: 72px 0 40px; }
  .lead { font-size: 16px; }
  .hero-facts { margin-top: 48px; }
  .sec { padding: 64px 0; }
  .grid4, .grid3 { grid-template-columns: 1fr; }
  .shorts { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .steps { grid-template-columns: 1fr; }
  .row2 { grid-template-columns: 1fr; }
  .banner { flex-direction: column; align-items: flex-start; }
  .form { padding: 20px; }
  .mbar { display: grid; grid-template-columns: 1fr 1.4fr; position: fixed; left: 0; right: 0; bottom: 0; z-index: 60; box-shadow: 0 -2px 12px rgba(0,0,0,.12); }
  .mbar a { padding: 16px 0; text-align: center; font-weight: 800; background: #fff; color: var(--brand-ink); }
  .mbar a.pri { background: var(--brand); color: #fff; }
}