/* ===== 창문반사필름 | premium architectural glass design system ===== */

:root {
  --charcoal-dark: #16181b;
  --charcoal: #24272c;
  --charcoal-soft: #3a3e45;
  --gray-line: #545962;
  --gray-mid: #9198a1;
  --silver: #c7ccd1;
  --gray-light: #eef0f2;
  --white: #ffffff;
  --metal-gradient: linear-gradient(135deg, #eef0f2 0%, #c7ccd1 45%, #f4f5f6 100%);
  --glass-gradient: linear-gradient(160deg, rgba(199, 204, 209, 0.35), rgba(36, 39, 44, 0.05));
  --radius: 2px;
  --max: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Pretendard", "Malgun Gothic", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--charcoal);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -0.02em; }
p { margin: 0; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-mid);
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.3;
  margin-bottom: 20px;
}
.section-desc {
  font-size: 17px;
  color: var(--gray-line);
  max-width: 620px;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  background: var(--charcoal-dark);
  color: var(--white);
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius);
  border: 1px solid var(--charcoal-dark);
  transition: background 0.2s, color 0.2s;
}
.btn:hover { background: transparent; color: var(--charcoal-dark); }
.btn-ghost {
  background: transparent;
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.4);
}
.btn-ghost:hover { background: rgba(255,255,255,0.1); color: var(--white); }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(22, 24, 27, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.logo { display: flex; align-items: center; gap: 10px; margin-right: auto; }
.logo-mark {
  width: 20px; height: 20px;
  background: var(--metal-gradient);
  transform: rotate(45deg);
  flex-shrink: 0;
}
.logo-text { color: var(--white); font-weight: 700; font-size: 18px; letter-spacing: -0.01em; }
.site-nav ul { display: flex; gap: 28px; }
.site-nav a { color: var(--silver); font-size: 14.5px; font-weight: 500; transition: color 0.2s; }
.site-nav a:hover, .site-nav a.active { color: var(--white); }
.header-cta {
  display: flex; flex-direction: column; align-items: flex-end;
  color: var(--white); border-left: 1px solid rgba(255,255,255,0.15); padding-left: 24px;
}
.cta-label { font-size: 11px; color: var(--gray-mid); letter-spacing: 0.08em; }
.cta-number { font-size: 15px; font-weight: 700; }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--white); margin: 4px 0; }

/* ===== Section 1: Case gallery (magazine) ===== */
.case-gallery { padding: 56px 0 80px; background: var(--charcoal-dark); }
.case-gallery .section-tag { color: var(--gray-mid); }
.case-gallery .section-title { color: var(--white); }
.case-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-template-rows: repeat(2, 260px);
  gap: 16px;
  margin-top: 40px;
}
.case-item {
  position: relative;
  overflow: hidden;
  grid-column: span 3;
}
.case-item.emphasis { grid-column: span 4; }
.case-item.small { grid-column: span 2; }
.case-item img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.case-item:hover img { transform: scale(1.05); }
.case-caption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 20px;
  background: linear-gradient(to top, rgba(0,0,0,0.75), transparent);
  color: var(--white);
}
.case-caption .num { font-size: 12px; color: var(--silver); letter-spacing: 0.1em; }
.case-caption .title { font-size: 18px; font-weight: 700; margin-top: 4px; }

/* ===== Section 2: Hero ===== */
.hero {
  background: var(--gray-light);
  padding: 88px 0;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero h1 { font-size: 14px; color: var(--gray-mid); letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 20px; }
.hero-headline {
  font-size: clamp(32px, 4.2vw, 48px);
  line-height: 1.35;
  color: var(--charcoal-dark);
  margin-bottom: 24px;
}
.hero-sub { font-size: 17px; color: var(--gray-line); max-width: 460px; margin-bottom: 36px; }
.hero-media { position: relative; }
.hero-media img { width: 100%; border-radius: var(--radius); }
.hero-media::after {
  content: "";
  position: absolute; inset: 0;
  background: var(--glass-gradient);
  pointer-events: none;
}

/* ===== Section 3: Why (big typo) ===== */
.why-section { padding: 120px 0; }
.why-headline {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.5;
  color: var(--charcoal-dark);
  max-width: 820px;
  margin-bottom: 72px;
}
.why-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
  border-top: 1px solid var(--gray-mid);
  padding-top: 40px;
}
.why-item .why-num { font-size: 13px; color: var(--gray-mid); margin-bottom: 12px; display: block; }
.why-item .why-label { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.why-item .why-desc { font-size: 14.5px; color: var(--gray-line); }

/* ===== Section 4: Space grid ===== */
.space-section { background: var(--charcoal-dark); padding: 100px 0; }
.space-section .section-tag { color: var(--gray-mid); }
.space-section .section-title, .space-section .section-desc { color: var(--white); }
.space-section .section-desc { color: var(--silver); }
.space-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: rgba(255,255,255,0.1); }
.space-card {
  background: var(--charcoal-dark);
  color: var(--white);
}
.space-card-img { width: 100%; height: 180px; object-fit: cover; }
.space-card h3, .space-card dl { padding-left: 32px; padding-right: 32px; }
.space-card h3 { font-size: 20px; margin: 24px 0 18px; }
.space-card dl { padding-bottom: 32px; }
.space-card dl { display: grid; gap: 10px; }
.space-card dt { font-size: 12px; color: var(--gray-mid); letter-spacing: 0.05em; }
.space-card dd { margin: 2px 0 0; font-size: 14.5px; color: var(--silver); }

/* ===== Section 5: Compare table ===== */
.compare-section { padding: 100px 0; }
.compare-scroll { overflow-x: auto; }
.compare-table { width: 100%; border-collapse: collapse; min-width: 640px; }
.compare-table th, .compare-table td {
  padding: 18px 20px;
  text-align: left;
  border-bottom: 1px solid var(--gray-light);
  font-size: 14.5px;
}
.compare-table thead th {
  background: var(--charcoal-dark);
  color: var(--white);
  font-weight: 700;
  font-size: 14px;
}
.compare-table thead th:first-child { color: var(--silver); }
.compare-table tbody th { color: var(--gray-mid); font-weight: 600; width: 180px; }
.compare-table tbody tr:hover { background: var(--gray-light); }

/* ===== Section 6: Timeline ===== */
.timeline-section { background: var(--gray-light); padding: 100px 0; }
.timeline { display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; margin-top: 48px; }
.timeline-step { position: relative; padding: 0 16px; text-align: center; }
.timeline-step::before {
  content: ""; position: absolute; top: 21px; left: -50%; width: 100%; height: 1px;
  background: var(--gray-mid);
}
.timeline-step:first-child::before { display: none; }
.timeline-dot {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--white); border: 1px solid var(--gray-mid);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; color: var(--charcoal-dark);
  margin: 0 auto 16px; position: relative; z-index: 1;
}
.timeline-step .step-label { font-size: 14.5px; font-weight: 700; }

/* ===== Section 7: FAQ ===== */
.faq-section { padding: 100px 0; }
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 40px; }
.faq-card {
  border: 1px solid var(--gray-light);
  padding: 4px 24px;
  border-radius: var(--radius);
}
.faq-card summary {
  cursor: pointer; padding: 20px 0; font-weight: 700; font-size: 15.5px;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  list-style: none;
}
.faq-card summary::-webkit-details-marker { display: none; }
.faq-card summary::after { content: "+"; font-size: 22px; color: var(--gray-mid); flex-shrink: 0; }
.faq-card[open] summary::after { content: "\2212"; }
.faq-card p { padding-bottom: 20px; color: var(--gray-line); font-size: 14.5px; }

/* ===== CTA banner ===== */
.cta-banner { background: var(--charcoal-dark); padding: 80px 0; text-align: center; }
.cta-banner h2 { color: var(--white); font-size: clamp(22px, 3vw, 30px); margin-bottom: 32px; }

/* ===== Inner page article ===== */
.page-hero { background: var(--charcoal-dark); padding: 64px 0 48px; }
.page-hero .section-tag { color: var(--gray-mid); }
.page-hero h1 { color: var(--white); font-size: clamp(28px, 3.6vw, 40px); margin-bottom: 12px; }
.page-hero p { color: var(--silver); max-width: 600px; font-size: 16px; }
.article { padding: 64px 0; }
.article-body { max-width: 760px; margin: 0 auto; }
.article-body h2 { font-size: 24px; margin: 48px 0 16px; }
.article-body h2:first-child { margin-top: 0; }
.article-body p { font-size: 16px; color: var(--charcoal-soft); margin-bottom: 16px; }
.article-body ul { margin: 16px 0; }
.article-body ul li { padding-left: 20px; position: relative; margin-bottom: 10px; font-size: 15.5px; color: var(--charcoal-soft); }
.article-body ul li::before { content: ""; position: absolute; left: 0; top: 9px; width: 6px; height: 6px; background: var(--silver); }
.article-media { margin: 32px 0; }
.article-media img { width: 100%; border-radius: var(--radius); }
.article-media figcaption { font-size: 13px; color: var(--gray-mid); margin-top: 8px; }

.before-after { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 32px 0 12px; }
.ba-item img { width: 100%; height: 240px; object-fit: cover; border-radius: var(--radius); }
.ba-item figcaption {
  text-align: center; font-size: 13px; font-weight: 700; color: var(--charcoal-dark);
  margin-top: 8px; letter-spacing: 0.05em;
}
.ba-note { font-size: 13px; color: var(--gray-mid); margin-bottom: 16px; }
.related-links { background: var(--gray-light); padding: 56px 0; }
.related-links h2 { font-size: 20px; margin-bottom: 24px; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.related-grid a {
  background: var(--white); padding: 18px 20px; border: 1px solid var(--silver);
  font-weight: 600; font-size: 14.5px;
}
.related-grid a:hover { background: var(--charcoal-dark); color: var(--white); border-color: var(--charcoal-dark); }

/* ===== Footer ===== */
.site-footer { background: var(--charcoal-dark); color: var(--silver); padding: 72px 0 0; }
.footer-inner {
  max-width: var(--max); margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 32px;
  padding-bottom: 56px;
}
.footer-col h3 { color: var(--white); font-size: 14px; margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 10px; font-size: 14px; }
.footer-col a:hover { color: var(--white); }
.footer-brand p { margin-top: 12px; font-size: 14px; color: var(--gray-mid); }
.biz-info li { color: var(--gray-mid); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 24px; text-align: center; font-size: 13px; color: var(--gray-mid);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .why-list { grid-template-columns: repeat(2, 1fr); }
  .space-grid { grid-template-columns: repeat(2, 1fr); }
  .timeline { grid-template-columns: repeat(3, 1fr); row-gap: 32px; }
  .timeline-step:nth-child(4)::before { display: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .site-nav, .header-cta { display: none; }
  .nav-toggle { display: block; }
  .site-nav.open { display: block; position: absolute; top: 72px; left: 0; right: 0; background: var(--charcoal-dark); padding: 16px 24px; }
  .site-nav.open ul { flex-direction: column; gap: 4px; }
  .site-nav.open a { display: block; padding: 12px 0; }
  .case-grid { grid-template-columns: repeat(2, 1fr); grid-template-rows: repeat(4, 200px); }
  .case-item, .case-item.emphasis, .case-item.small { grid-column: span 2; }
  .why-list { grid-template-columns: 1fr; }
  .space-grid { grid-template-columns: 1fr; }
  .faq-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; }
  .timeline-step::before { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .before-after { grid-template-columns: 1fr; }
}