/* =========================================================
   STRATA Co., Ltd. — Design System v2
   브랜드 컬러는 첨부 로고(골드 스우시 + 카본 블랙)에서 추출
   ※ 공식 가이드 색상값이 확정되면 --gold 만 바꾸면 전체 반영됩니다.
   ========================================================= */

:root {
  /* Brand */
  --gold: #F7C400;            /* strata_logo_new.png 스우시 골드 (공식 hex 확정 시 여기만 교체) */
  --gold-deep: #9C7A00;        /* 흰 배경 위 텍스트·라벨용 저감 버전 */
  --gold-soft: rgba(247, 196, 0, .16);
  --logo-black: #111111;       /* 워드마크 검정 */
  --ink: #0E1013;             /* 아스팔트 카본 블랙 */
  --ink-2: #171A1F;
  --ink-3: #22262D;

  /* Neutral */
  --paper: #FFFFFF;
  --paper-2: #F5F6F8;
  --line: #E4E7EC;
  --text: #1B1E23;
  --muted: #5C646F;
  --muted-dark: rgba(255, 255, 255, .72);

  /* Effect */
  --radius: 18px;
  --radius-sm: 12px;
  --shadow-sm: 0 2px 10px rgba(14, 16, 19, .06);
  --shadow: 0 18px 40px -18px rgba(14, 16, 19, .28);
  --shadow-gold: 0 14px 34px -14px rgba(245, 179, 1, .55);
  --maxw: 1200px;
  --nav-h: 76px;
  --ease: cubic-bezier(.22, .68, .32, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Pretendard', 'Pretendard Variable', -apple-system, BlinkMacSystemFont,
    'Apple SD Gothic Neo', 'Noto Sans KR', 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--paper);
  line-height: 1.65;
  overflow-x: hidden;
  font-feature-settings: 'tnum' 1, 'liga' 1;
  -webkit-font-smoothing: antialiased;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -.02em; font-weight: 800; }

::selection { background: var(--gold); color: #111; }

.skip { position: absolute; left: -9999px; top: 0; z-index: 2000; background: var(--gold); color: #111; padding: 10px 16px; font-weight: 700; }
.skip:focus { left: 12px; top: 12px; }

/* ===== Layout helpers ===== */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 104px 0; position: relative; }
.section--tight { padding: 76px 0; }
.section--paper { background: var(--paper-2); }
.section--dark { background: var(--ink); color: #fff; }
.section--dark h1, .section--dark h2, .section--dark h3 { color: #fff; }
.section--dark .lead, .section--dark p { color: var(--muted-dark); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12.5px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase;
  color: var(--gold-deep);
}
.eyebrow::before { content: ''; width: 26px; height: 3px; background: var(--gold); border-radius: 2px; }
.section--dark .eyebrow { color: var(--gold); }

h2.sec-title { font-size: clamp(28px, 4.1vw, 44px); margin: 16px 0 14px; }
.sec-head { max-width: 780px; margin-bottom: 52px; }
.sec-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head--center .eyebrow::before { display: none; }
.lead { font-size: clamp(15.5px, 1.6vw, 18px); color: var(--muted); }

.grid { display: grid; gap: 24px; }
.g-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 15px 28px; border-radius: 999px; border: 1.5px solid transparent;
  font-weight: 700; font-size: 15px; cursor: pointer; white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s, color .25s, border-color .25s;
}
.btn:hover { transform: translateY(-3px); }
.btn--gold { background: var(--gold); color: #14160A; box-shadow: var(--shadow-gold); }
.btn--gold:hover { background: #FFC627; }
.btn--ghost { border-color: rgba(255, 255, 255, .38); color: #fff; }
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn--outline { border-color: var(--line); color: var(--text); background: #fff; }
.btn--outline:hover { border-color: var(--ink); }
.btn--sm { padding: 11px 20px; font-size: 14px; }

.link-arrow { display: inline-flex; align-items: center; gap: 7px; font-weight: 700; color: var(--gold-deep); }
.link-arrow::after { content: '\2192'; transition: transform .25s var(--ease); }
.link-arrow:hover::after { transform: translateX(5px); }

/* ===== Header / Nav ===== */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 1000; height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(14, 16, 19, .72); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  transition: background .3s, box-shadow .3s, color .3s;
}
.site-header.is-light {
  background: rgba(255, 255, 255, .92); border-bottom-color: var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; width: 100%; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: #fff; }
.is-light .brand { color: var(--ink); }
.brand svg, .brand img { height: 30px; width: auto; }
/* 공식 로고 PNG/SVG 를 넣을 때: <a class="brand"><img class="brand-img" src="assets/img/logo-black.png" alt="STRATA"></a>
   다크 히어로에서는 logo-white.png, 스크롤 후 흰 헤더에서는 logo-black.png 를 표시합니다. */
.brand .brand-img { display: none; height: 32px; width: auto; }
.brand--img svg { display: none; }
.brand--img .brand-img { display: block; }
.site-header:not(.is-light) .brand--img .logo-dark { display: none; }
.site-header:not(.is-light) .brand--img .logo-light { display: block; }
.site-header.is-light .brand--img .logo-dark { display: block; }
.site-header.is-light .brand--img .logo-light { display: none; }
.brand .brand-sub {
  font-size: 10.5px; font-weight: 700; letter-spacing: .2em; text-transform: uppercase;
  color: rgba(255, 255, 255, .5); border-left: 1px solid rgba(255, 255, 255, .22); padding-left: 11px;
}
.is-light .brand .brand-sub { color: var(--muted); border-left-color: var(--line); }

.nav-menu { display: flex; align-items: center; gap: 34px; }
.nav-menu > li { position: relative; }
.nav-menu a.nav-link {
  display: inline-block; padding: 8px 0; font-size: 15px; font-weight: 600;
  color: rgba(255, 255, 255, .8); position: relative;
}
.is-light .nav-menu a.nav-link { color: #333941; }
.nav-menu a.nav-link::after {
  content: ''; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--gold); transition: width .28s var(--ease);
}
.nav-menu a.nav-link:hover, .nav-menu a.nav-link[aria-current='page'] { color: var(--gold); }
.is-light .nav-menu a.nav-link:hover, .is-light .nav-menu a.nav-link[aria-current='page'] { color: var(--gold-deep); }
.nav-menu a.nav-link:hover::after, .nav-menu a.nav-link[aria-current='page']::after { width: 100%; }

.dropdown { position: absolute; top: calc(100% + 12px); left: -14px; min-width: 236px; padding: 10px;
  background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transform: translateY(8px); transition: .25s var(--ease); }
.nav-menu li:hover .dropdown, .nav-menu li:focus-within .dropdown { opacity: 1; visibility: visible; transform: none; }
.dropdown a { display: block; padding: 11px 13px; border-radius: 9px; color: #24282E; font-size: 14.5px; font-weight: 600; }
.dropdown a small { display: block; font-weight: 500; color: var(--muted); font-size: 12.5px; margin-top: 2px; }
.dropdown a:hover { background: var(--gold-soft); color: var(--gold-deep); }

.nav-burger { display: none; width: 44px; height: 44px; border: 0; background: transparent; cursor: pointer;
  position: relative; z-index: 1100; }
.nav-burger span { display: block; width: 24px; height: 2px; background: #fff; margin: 5px auto; transition: .3s var(--ease); }
.is-light .nav-burger span { background: var(--ink); }
body.nav-open .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-burger span:nth-child(2) { opacity: 0; }
body.nav-open .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  padding: calc(var(--nav-h) + 72px) 0 96px; color: #fff; overflow: hidden;
  background:
    radial-gradient(1100px 520px at 82% -10%, rgba(245, 179, 1, .18), transparent 62%),
    linear-gradient(160deg, #0B0D10 0%, #14171C 46%, #0B0D10 100%);
}
.hero::after { /* 아스팔트 골재 질감 */
  content: ''; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    radial-gradient(rgba(255, 255, 255, .07) 1px, transparent 1.4px),
    radial-gradient(rgba(255, 255, 255, .05) 1px, transparent 1.4px);
  background-size: 26px 26px, 17px 17px;
  background-position: 0 0, 9px 13px;
}
.hero-swoosh { position: absolute; right: -6%; bottom: -6%; width: min(940px, 86vw); opacity: .5; pointer-events: none; }
.hero-lane { position: absolute; left: 0; right: 0; bottom: 0; height: 130px; opacity: .22; pointer-events: none;
  background: repeating-linear-gradient(112deg, transparent 0 68px, rgba(245, 179, 1, .8) 68px 76px);
  mask-image: linear-gradient(to top, #000, transparent); -webkit-mask-image: linear-gradient(to top, #000, transparent); }
.hero .container { position: relative; z-index: 2; }
.hero-inner { max-width: 830px; }
.hero h1 { font-size: clamp(34px, 6.1vw, 68px); font-weight: 900; letter-spacing: -.035em; margin: 22px 0 20px; }
.hero h1 .hl { position: relative; color: var(--gold); white-space: nowrap; }
.hero p.lead { color: rgba(255, 255, 255, .82); font-size: clamp(16px, 1.9vw, 19px); max-width: 700px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.hero-stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2px;
  margin-top: 72px; border: 1px solid rgba(255, 255, 255, .13); border-radius: var(--radius);
  overflow: hidden; background: rgba(255, 255, 255, .06);
}
.hero-stats > div { padding: 24px 22px; background: rgba(10, 12, 14, .45); }
.hero-stats b { display: block; font-size: clamp(22px, 3vw, 32px); font-weight: 900; color: var(--gold); letter-spacing: -.03em; }
.hero-stats span { font-size: 13.5px; color: rgba(255, 255, 255, .62); }

/* Page hero (detail pages) */
.page-hero {
  padding: calc(var(--nav-h) + 84px) 0 72px; color: #fff; position: relative; overflow: hidden;
  background: linear-gradient(150deg, #0B0D10, #191D23 60%, #0E1013);
}
.page-hero::after { content: ''; position: absolute; inset: 0; opacity: .4;
  background-image: radial-gradient(rgba(255, 255, 255, .07) 1px, transparent 1.4px); background-size: 24px 24px; }
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(30px, 5vw, 52px); margin: 18px 0 16px; font-weight: 900; letter-spacing: -.03em; }
.page-hero p { color: rgba(255, 255, 255, .78); max-width: 820px; font-size: clamp(15px, 1.6vw, 17.5px); }
.breadcrumb { font-size: 13px; color: rgba(255, 255, 255, .5); display: flex; gap: 8px; flex-wrap: wrap; }
.breadcrumb a:hover { color: var(--gold); }
.hero-metrics { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.hero-metrics div { border: 1px solid rgba(255, 255, 255, .16); border-radius: 999px; padding: 10px 20px;
  background: rgba(255, 255, 255, .05); font-size: 13.5px; color: rgba(255, 255, 255, .8); }
.hero-metrics b { color: var(--gold); font-weight: 800; }

/* ===== Cards ===== */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; position: relative; overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(245, 179, 1, .55); }
.card__icon {
  width: 54px; height: 54px; border-radius: 15px; display: grid; place-items: center;
  background: var(--gold-soft); color: var(--gold-deep); margin-bottom: 20px;
}
.card__icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 21px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15px; }
.card .tag { display: inline-block; font-size: 11.5px; font-weight: 800; letter-spacing: .08em;
  text-transform: uppercase; color: var(--gold-deep); background: var(--gold-soft);
  padding: 5px 11px; border-radius: 999px; margin-bottom: 14px; }
.card--feature { padding: 40px; display: flex; flex-direction: column; }
.card--feature .btn { align-self: flex-start; margin-top: auto; }
.card__num { position: absolute; right: 22px; top: 10px; font-size: 74px; font-weight: 900;
  color: rgba(14, 16, 19, .05); letter-spacing: -.05em; }
.section--dark .card { background: rgba(255, 255, 255, .045); border-color: rgba(255, 255, 255, .12); }
.section--dark .card:hover { border-color: var(--gold); box-shadow: none; }
.section--dark .card p { color: rgba(255, 255, 255, .7); }
.section--dark .card__num { color: rgba(255, 255, 255, .07); }

.checks li { display: flex; gap: 11px; align-items: flex-start; padding: 8px 0; font-size: 15px; color: var(--muted); }
.section--dark .checks li { color: rgba(255, 255, 255, .78); }
.checks li::before {
  content: ''; flex: none; width: 20px; height: 20px; margin-top: 3px; border-radius: 50%;
  background: var(--gold) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2314160A' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E") center/12px no-repeat;
}

/* ===== Split (image + text) ===== */
.split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.split--rev > :first-child { order: 2; }
.figure {
  position: relative; border-radius: var(--radius); overflow: hidden; background: #E9ECF1;
  aspect-ratio: 4 / 3; display: grid; place-items: center; border: 1px solid var(--line);
}
.figure img { width: 100%; height: 100%; object-fit: cover; }
.figure--placeholder { color: #9AA3AF; text-align: center; padding: 24px; }
.figure--placeholder b { display: block; font-size: 15px; color: #6B7480; margin-bottom: 4px; }
.figure--placeholder span { font-size: 13px; }
.figure__badge { position: absolute; left: 18px; bottom: 18px; background: var(--gold); color: #14160A;
  font-size: 12.5px; font-weight: 800; padding: 8px 15px; border-radius: 999px; }

/* ===== Stats band ===== */
.band { background: var(--ink); color: #fff; border-radius: var(--radius); padding: 46px;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px; }
.band--gold { background: linear-gradient(120deg, var(--gold), #FFCF3F); color: #14160A; }
.band__item b { display: block; font-size: clamp(26px, 3.4vw, 40px); font-weight: 900; letter-spacing: -.03em; }
.band__item span { font-size: 13.5px; opacity: .78; }
.band--gold .band__item span { opacity: .72; }

/* ===== Steps / process ===== */
.steps { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 18px; counter-reset: step; }
.step { position: relative; padding: 28px 22px; border-radius: var(--radius-sm); background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .12); }
.step::before { counter-increment: step; content: '0' counter(step); display: block; font-size: 13px;
  font-weight: 900; color: var(--gold); letter-spacing: .1em; margin-bottom: 14px; }
.step h4 { font-size: 16.5px; margin-bottom: 8px; color: #fff; }
.step p { font-size: 13.8px; color: rgba(255, 255, 255, .66); }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table.data { width: 100%; border-collapse: collapse; min-width: 720px; font-size: 14.5px; }
table.data caption { text-align: left; padding: 20px 22px 0; font-weight: 800; font-size: 16px; }
table.data th, table.data td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data thead th { background: #F2F4F7; font-weight: 800; font-size: 13.5px; color: #333941; white-space: nowrap; }
table.data tbody tr:hover { background: var(--gold-soft); }
table.data tbody tr:last-child th, table.data tbody tr:last-child td { border-bottom: 0; }
table.data th[scope='row'] { font-weight: 800; color: var(--ink); }
table.data .num { font-variant-numeric: tabular-nums; white-space: nowrap; }
.note { font-size: 13px; color: var(--muted); margin-top: 14px; }

/* ===== Spec highlight cards ===== */
.spec-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.spec { border: 1px solid var(--line); border-left: 4px solid var(--gold); border-radius: var(--radius-sm);
  background: #fff; padding: 24px; }
.spec b { display: block; font-size: 27px; font-weight: 900; letter-spacing: -.03em; color: var(--ink); }
.spec span { font-size: 13.5px; color: var(--muted); display: block; margin-top: 4px; }
.spec small { display: block; font-size: 12px; color: #98A0AB; margin-top: 10px; }

/* ===== Gallery ===== */
.gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.g-item { position: relative; border-radius: var(--radius-sm); overflow: hidden; aspect-ratio: 4 / 3;
  background: #E9ECF1; cursor: pointer; border: 1px solid var(--line); }
.g-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.g-item:hover img { transform: scale(1.07); }
.g-item figcaption { position: absolute; inset: auto 0 0 0; padding: 42px 18px 16px; color: #fff; font-size: 14px;
  font-weight: 700; background: linear-gradient(to top, rgba(8, 9, 11, .88), transparent); }
.g-item figcaption small { display: block; font-weight: 500; opacity: .72; font-size: 12.5px; }
.g-item--empty { display: grid; place-items: center; text-align: center; color: #98A0AB; cursor: default; padding: 18px; }
.g-item--empty:hover { border-color: var(--line); }
.lightbox { position: fixed; inset: 0; background: rgba(6, 7, 9, .92); display: none; place-items: center;
  z-index: 1500; padding: 32px; }
.lightbox.open { display: grid; }
.lightbox img { max-width: min(1080px, 92vw); max-height: 84vh; border-radius: var(--radius-sm); }
.lightbox button { position: absolute; top: 22px; right: 26px; width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .3); background: transparent; color: #fff; font-size: 22px; cursor: pointer; }

/* ===== FAQ ===== */
.faq { max-width: 900px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary { list-style: none; cursor: pointer; padding: 22px 46px 22px 0; font-weight: 700; font-size: 16.5px; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; position: absolute; right: 6px; top: 20px; font-size: 24px; font-weight: 400;
  color: var(--gold-deep); transition: transform .3s var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .faq-body { padding: 0 0 24px; color: var(--muted); font-size: 15px; }

/* ===== Callout / notice ===== */
.callout { border-radius: var(--radius); padding: 28px 30px; background: var(--gold-soft);
  border: 1px solid rgba(245, 179, 1, .45); }
.callout h4 { font-size: 17px; margin-bottom: 8px; }
.callout p { font-size: 14.5px; color: #4A4230; }
.section--dark .callout { background: rgba(245, 179, 1, .1); border-color: rgba(245, 179, 1, .35); }
.section--dark .callout p { color: rgba(255, 255, 255, .8); }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 44px; align-items: start; }
.info-list li { display: flex; gap: 16px; padding: 20px 0; border-bottom: 1px solid rgba(255, 255, 255, .12); }
.info-list b { display: block; font-size: 13px; color: var(--gold); letter-spacing: .08em; text-transform: uppercase; }
.info-list span { font-size: 16px; font-weight: 700; color: #fff; }
.info-list small { display: block; font-size: 13px; color: rgba(255, 255, 255, .58); font-weight: 400; margin-top: 3px; }
.info-list svg { width: 22px; height: 22px; flex: none; color: var(--gold); margin-top: 6px; }

.form-card { background: #fff; color: var(--text); border-radius: var(--radius); padding: 34px; box-shadow: var(--shadow); }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; font-weight: 700; margin-bottom: 7px; }
.field label .req { color: #D64545; }
.field input, .field textarea, .field select {
  width: 100%; padding: 14px 16px; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  background: #FBFCFD; transition: border-color .2s, background .2s; font-size: 15px;
}
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--gold); background: #fff; }
.field textarea { min-height: 140px; resize: vertical; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-note { font-size: 12.5px; color: #98A0AB; margin-top: 14px; line-height: 1.6; }
.consent { display: flex; gap: 9px; align-items: flex-start; font-size: 13px; color: var(--muted); margin: 6px 0 20px; }
.consent input { width: auto; margin-top: 3px; }

/* ===== Footer ===== */
.site-footer { background: #08090B; color: rgba(255, 255, 255, .6); padding: 76px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; }
.site-footer h5 { color: #fff; font-size: 14px; letter-spacing: .06em; margin-bottom: 18px; text-transform: uppercase; }
.site-footer li { padding: 6px 0; font-size: 14.5px; }
.site-footer a:hover { color: var(--gold); }
.footer-brand svg,
.footer-brand img { height: 32px; width: auto; margin-bottom: 18px; }
.footer-brand p { font-size: 14px; line-height: 1.75; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding: 24px 0; display: flex;
  justify-content: space-between; gap: 18px; flex-wrap: wrap; font-size: 13px; }
.footer-legal { display: flex; gap: 18px; flex-wrap: wrap; }

/* ===== Partner strip ===== */
.partner-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; align-items: stretch; }
.partner { border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; background: #fff;
  display: flex; flex-direction: column; gap: 8px; transition: .3s var(--ease); }
.partner:hover { border-color: var(--gold); transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.partner b { font-size: 19px; letter-spacing: -.02em; }
.partner span { font-size: 13px; color: var(--muted); }
.partner em { font-style: normal; font-size: 12px; font-weight: 800; color: var(--gold-deep);
  text-transform: uppercase; letter-spacing: .1em; margin-top: auto; padding-top: 12px; }

/* ===== Reveal animation ===== */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
[data-reveal].in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ===== Back to top ===== */
.to-top { position: fixed; right: 22px; bottom: 22px; width: 48px; height: 48px; border-radius: 50%;
  border: 0; background: var(--gold); color: #14160A; font-size: 20px; cursor: pointer; box-shadow: var(--shadow-gold);
  opacity: 0; visibility: hidden; transform: translateY(12px); transition: .3s var(--ease); z-index: 900; }
.to-top.show { opacity: 1; visibility: visible; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 1080px) {
  .g-4, .band, .spec-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  :root { --nav-h: 68px; }
  .section { padding: 76px 0; }
  .nav-burger { display: block; }
  .nav-menu {
    position: fixed; inset: 0 0 0 auto; width: min(340px, 86vw); background: #0E1013;
    flex-direction: column; align-items: flex-start; gap: 0; padding: calc(var(--nav-h) + 24px) 28px 40px;
    transform: translateX(100%); transition: transform .35s var(--ease); overflow-y: auto;
  }
  body.nav-open .nav-menu { transform: none; }
  .nav-menu > li { width: 100%; border-bottom: 1px solid rgba(255, 255, 255, .1); }
  .nav-menu a.nav-link { color: #fff; font-size: 17px; padding: 16px 0; width: 100%; }
  .dropdown { position: static; opacity: 1; visibility: visible; transform: none; background: transparent;
    border: 0; box-shadow: none; padding: 0 0 12px; min-width: 0; }
  .dropdown a { color: rgba(255, 255, 255, .68); padding: 8px 0 8px 14px; font-size: 15px; }
  .dropdown a small { color: rgba(255, 255, 255, .38); }
  .dropdown a:hover { background: transparent; color: var(--gold); }
  .nav-cta-wrap { display: none; }
  .split, .contact-grid { grid-template-columns: 1fr; gap: 34px; }
  .split--rev > :first-child { order: 0; }
  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 48px; }
  .g-2, .g-3, .gallery { grid-template-columns: 1fr; }
  .band { padding: 32px; }
}
@media (max-width: 560px) {
  .container { padding: 0 18px; }
  .g-4, .band, .spec-grid, .steps, .footer-grid, .partner-strip, .field-row { grid-template-columns: 1fr; }
  .card, .form-card, .card--feature { padding: 24px; }
  .hero { min-height: auto; }
  .hero-cta .btn { width: 100%; }
}


/* ===== Bridge Map CTA (적용 현장 섹션) — JS 의존 없음 ===== */
@keyframes cta-in{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.bridge-cta{display:flex;gap:32px;align-items:center;justify-content:space-between;
  margin-top:38px;padding:36px 40px;border-radius:var(--radius);position:relative;overflow:hidden;
  background:linear-gradient(135deg,var(--ink) 0%,var(--ink-3) 100%);color:#fff;text-decoration:none;
  box-shadow:var(--shadow);transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.bridge-cta::before{content:'';position:absolute;top:-90px;right:-70px;width:300px;height:300px;
  background:radial-gradient(circle,var(--gold-soft),transparent 65%);border-radius:50%;pointer-events:none}
.bridge-cta::after{content:'';position:absolute;bottom:-110px;left:32%;width:240px;height:240px;
  background:radial-gradient(circle,rgba(247,196,0,.08),transparent 65%);border-radius:50%;pointer-events:none}
.bridge-cta:hover{transform:translateY(-4px);box-shadow:0 26px 54px -22px rgba(14,16,19,.5)}
.bridge-cta .eyebrow{color:var(--gold)}
.bridge-cta h3{font-size:clamp(19px,2.6vw,26px);line-height:1.35;margin:10px 0 8px;color:#fff;letter-spacing:-.3px}
.bridge-cta p{color:var(--muted-dark);font-size:15px;line-height:1.7;max-width:600px}
.bridge-cta p b{color:var(--gold);font-weight:700}
.bridge-cta__btn{display:inline-flex;align-items:center;gap:8px;margin-top:20px;padding:13px 24px;
  background:var(--gold);color:#14160A;font-weight:700;font-size:14px;border-radius:999px;
  box-shadow:var(--shadow-gold)}
.bridge-cta__btn svg{transition:transform .3s var(--ease)}
.bridge-cta:hover .bridge-cta__btn svg{transform:translateX(5px)}
.bridge-cta__stats{display:flex;gap:30px;flex:0 0 auto;text-align:center;position:relative;z-index:1}
.bridge-cta__stats b{display:block;font-size:clamp(24px,3vw,34px);color:var(--gold);letter-spacing:-.5px;line-height:1.2}
.bridge-cta__stats span{font-size:12px;color:var(--muted-dark);white-space:nowrap}
@media (max-width:860px){
  .bridge-cta{flex-direction:column;align-items:flex-start;gap:22px;padding:26px 22px}
  .bridge-cta__stats{width:100%;justify-content:space-between;gap:10px;
    border-top:1px solid rgba(255,255,255,.14);padding-top:18px}
}
.bridge-cta{animation:cta-in .7s var(--ease) both}
@media (prefers-reduced-motion: reduce){.bridge-cta{animation:none}}

/* ===== Hero opening video ===== */
.hero-video{position:absolute;inset:0;z-index:0;overflow:hidden}
.hero-video video{width:100%;height:100%;object-fit:cover;object-position:center;display:block;
  filter:saturate(.92) contrast(1.04)}
.hero-video::after{content:'';position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(92deg,rgba(11,13,16,.94) 0%,rgba(11,13,16,.72) 42%,rgba(11,13,16,.28) 78%,rgba(11,13,16,.48) 100%),
             linear-gradient(to top,rgba(11,13,16,.92),transparent 36%)}
@media (max-width:860px){
  .hero-video video{object-position:62% center}
  .hero-video::after{background:linear-gradient(180deg,rgba(11,13,16,.66),rgba(11,13,16,.55) 55%,rgba(11,13,16,.9)),
    linear-gradient(92deg,rgba(11,13,16,.35),transparent 60%)}
}
@media (prefers-reduced-motion: reduce){
  .hero-video video{display:none}
  .hero-video{background:url('images/strata_opening_poster.jpg') center/cover no-repeat}
}