/* U형측구배수로시공 — blueprint / drafting-sheet theme (self-contained, page-scoped) */

:root {
  --navy: #0F3460;
  --navy-deep: #0A2647;
  --teal: #16C79A;
  --ink: #1B2733;
  --paper: #FBFCFE;
  --line: #C9D6E3;
  --line-soft: #E3EAF1;
  --radius: 0;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "IBM Plex Sans KR", "Noto Sans KR", "Malgun Gothic", sans-serif;
  font-display: swap;
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 72px; /* room for mobile CTA bar */
}

h1, h2 {
  font-weight: 700;
  color: var(--navy-deep);
  line-height: 1.35;
}

a { color: var(--navy); }
a:hover { color: var(--teal); }

.mono {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-weight: 600;
}

/* ---------- Hero / blueprint grid ---------- */

.hero-blueprint {
  position: relative;
  overflow: hidden;
  background: var(--navy-deep);
  padding: 56px 20px 48px;
  border-bottom: 4px solid var(--teal);
}

.blueprint-grid {
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(255,255,255,0.06) 0, rgba(255,255,255,0.06) 1px, transparent 1px, transparent 32px),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.06) 0, rgba(255,255,255,0.06) 1px, transparent 1px, transparent 32px);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--teal);
  border: 1px solid rgba(22,199,154,0.5);
  padding: 6px 12px;
  margin-bottom: 20px;
}

.brand-home {
  display: block;
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.05rem;
  margin-bottom: 16px;
}
.brand-home:hover { color: var(--teal); }

.hero-blueprint h1 {
  color: #fff;
  font-size: 1.7rem;
  margin: 0 0 16px;
}

.hero-lede {
  color: #DCE6F0;
  font-size: 1rem;
  max-width: 68ch;
  margin: 0;
}

/* ---------- Section layout ---------- */

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 36px 0;
}

.section-inner { position: relative; }

.ruler-divider {
  height: 10px;
  margin-bottom: 24px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0, var(--line) 1px, transparent 1px, transparent 24px);
  background-position: bottom;
  background-repeat: repeat-x;
  background-size: auto 100%;
  border-bottom: 1px solid var(--line);
}

.section h2 {
  font-size: 1.3rem;
  margin: 0 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--teal);
}

.section p, .section li {
  color: var(--ink);
}

/* ---------- Spec table (visual centerpiece) ---------- */

.spec-section {
  background: #fff;
  border: 2px solid var(--navy);
  padding: 28px 20px;
  margin: 12px 0 40px;
  box-shadow: 8px 8px 0 rgba(15,52,96,0.08);
}

.spec-note {
  font-size: 0.95rem;
  color: #4A5A6A;
  margin-bottom: 20px;
}

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--line);
}

.spec-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.spec-table caption {
  text-align: left;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--navy);
  padding: 10px 12px;
  background: var(--line-soft);
  border-bottom: 1px solid var(--line);
}

.spec-table th, .spec-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
}

.spec-table thead th {
  background: var(--navy-deep);
  color: #fff;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.spec-table tbody tr:nth-child(even) { background: #F4F8FB; }

.spec-table .mono {
  display: inline-block;
  background: var(--navy-deep);
  color: var(--teal);
  padding: 2px 10px;
  font-size: 0.95rem;
}

/* ---------- Gallery ---------- */

.gallery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.gallery-grid figure {
  margin: 0;
  border: 1px solid var(--line);
  background: #fff;
}

.gallery-grid img {
  display: block;
  width: 100%;
  height: auto;
}

.gallery-grid figcaption {
  padding: 10px 12px;
  font-size: 0.85rem;
  color: #4A5A6A;
  border-top: 1px solid var(--line-soft);
}

/* ---------- Check list ---------- */

.check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.check-list li {
  position: relative;
  padding-left: 28px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--teal);
}

/* ---------- FAQ ---------- */

.faq-item {
  border: 1px solid var(--line);
  margin-bottom: 10px;
  background: #fff;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font: inherit;
  font-weight: 600;
  color: var(--navy-deep);
  padding: 16px 44px 16px 16px;
  min-height: 44px;
  cursor: pointer;
  position: relative;
}

.faq-question::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: var(--teal);
}

.faq-question[aria-expanded="true"]::after {
  content: "\2212";
}

.faq-answer {
  padding: 0 16px 16px;
}

.faq-answer p { margin: 0; }

/* ---------- CTA ---------- */

.cta-section {
  background: var(--navy-deep);
  color: #fff;
  padding: 36px 20px;
  margin: 12px -20px 0;
}

.cta-section h2 {
  color: #fff;
  border-left-color: var(--teal);
}

.cta-section p { color: #DCE6F0; }

.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--teal);
  color: var(--navy-deep);
}
.btn-primary:hover { background: #12A886; color: var(--navy-deep); }

.btn-outline {
  background: transparent;
  border-color: #fff;
  color: #fff;
}
.btn-outline:hover { background: rgba(255,255,255,0.1); color: #fff; }

/* ---------- Footer ---------- */

.site-footer {
  background: #0A1A2E;
  color: #B9C6D3;
  padding: 32px 20px;
  font-size: 0.85rem;
}

.site-footer nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin: 0 0 20px;
  padding: 0;
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
}

.site-footer a {
  color: #B9C6D3;
  text-decoration: none;
}
.site-footer a:hover { color: var(--teal); }

.site-footer address {
  font-style: normal;
  max-width: 880px;
  margin: 0 auto 16px;
  line-height: 1.8;
}

.site-footer p {
  max-width: 880px;
  margin: 0 auto;
  color: #7C8C9C;
}

/* ---------- Mobile CTA bar ---------- */

.mobile-cta-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  gap: 8px;
  padding: 8px;
  background: #fff;
  border-top: 2px solid var(--navy);
  z-index: 50;
}

.mobile-cta-bar .btn {
  flex: 1;
  border-radius: 0;
}

/* ---------- Breakpoints ---------- */

@media (min-width: 480px) {
  .hero-blueprint h1 { font-size: 1.9rem; }
}

@media (min-width: 768px) {
  .hero-blueprint { padding: 72px 32px 64px; }
  .hero-blueprint h1 { font-size: 2.2rem; }
  .section { padding: 44px 0; }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .cta-buttons { flex-direction: row; }
  .cta-buttons .btn { flex: 1; }
}

@media (min-width: 1024px) {
  main { padding: 0 20px; }
  .hero-inner, main .section-inner { max-width: 880px; }
  .mobile-cta-bar { display: none; }
  body { padding-bottom: 0; }
  .hero-blueprint h1 { font-size: 2.5rem; }
  .spec-section { padding: 36px 40px; }
}

@media (min-width: 1280px) {
  main { max-width: 960px; margin: 0 auto; }
  .hero-inner { max-width: 960px; }
}