/* 교습소칸막이철거 — 스틸 그레이 / 블루프린트 스펙시트 컨셉 */

:root {
  --steel: #3A3F47;
  --steel-dark: #24272C;
  --steel-line: #6B7280;
  --accent: #00A8E8;
  --accent-dark: #0079A8;
  --paper: #F4F5F6;
  --paper-panel: #FFFFFF;
  --ink: #23262B;
  --ink-soft: #4B4F56;
  --border: #C7CCD1;
  --radius: 2px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans KR", "Noto Sans KR", -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-dark); }
a:hover, a:focus-visible { color: var(--accent); }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* blueprint background grid: applied on main so it sits under the paper cards */
main {
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  background-color: var(--paper);
  background-position: -1px -1px;
  padding: 0 0 64px;
}

/* ---------- header ---------- */
.site-header {
  background: var(--steel-dark);
  color: #E7E9EC;
  border-bottom: 4px solid var(--accent);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: #FFFFFF;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 1rem;
}
.brand-mark { color: var(--accent); display: inline-flex; }
.brand:hover, .brand:focus-visible { color: var(--accent); }

.main-nav { flex: 1 1 auto; }
.main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  margin: 0;
  padding: 0;
}
.main-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 4px 10px;
  color: #C7CCD1;
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
}
.main-nav a:hover,
.main-nav a:focus-visible {
  color: #FFFFFF;
  border-color: var(--accent);
}
.main-nav a[aria-current="page"] {
  color: var(--accent);
  border-color: var(--accent);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 16px;
  background: var(--accent);
  color: var(--steel-dark);
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--accent);
  white-space: nowrap;
}
.header-cta:hover, .header-cta:focus-visible {
  background: var(--steel-dark);
  color: var(--accent);
}

/* ---------- hero ---------- */
.hero {
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 20px 32px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.eyebrow {
  font-family: "IBM Plex Sans KR", sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--steel);
  display: inline-block;
}

h1 {
  font-size: clamp(1.7rem, 4.5vw, 2.6rem);
  line-height: 1.3;
  margin: 0 0 16px;
  color: var(--steel-dark);
  font-weight: 700;
}

.lede {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 62ch;
}

.hero-figure {
  margin: 0;
  border: 1px solid var(--border);
  background: var(--paper-panel);
  padding: 10px;
}
.hero-figure img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; }
.hero-figure figcaption {
  margin-top: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border-top: 1px dashed var(--border);
  padding-top: 8px;
}

/* ---------- technical rule divider ---------- */
.rule {
  max-width: 1280px;
  margin: 0 auto;
  height: 24px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--steel-line) 0,
    var(--steel-line) 8px,
    transparent 8px,
    transparent 16px
  );
  background-position: center;
  background-size: 100% 1px;
  background-repeat: no-repeat;
  padding: 0 20px;
}

/* ---------- section shell ---------- */
.section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 20px;
}

.section h2 {
  font-size: 1.4rem;
  color: var(--steel-dark);
  margin: 0 0 18px;
  padding-left: 14px;
  border-left: 6px solid var(--accent);
}

.section p { margin: 0 0 16px; max-width: 72ch; }
.section p:last-child { margin-bottom: 0; }

.situation-list,
.caution-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.situation-list li,
.caution-list li {
  background: var(--paper-panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--steel);
  padding: 14px 16px;
  max-width: 72ch;
}
.caution-list li { border-left-color: var(--accent-dark); }
.caution-list strong { color: var(--steel-dark); }

/* ---------- spec sheet table ---------- */
.spec-sheet {
  background: var(--paper-panel);
  border: 1px solid var(--border);
}

.table-wrap { overflow-x: auto; }

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

caption { text-align: left; }

th, td {
  border: 1px solid var(--border);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

thead th {
  background: var(--steel);
  color: #FFFFFF;
  font-weight: 700;
  letter-spacing: 0.02em;
}

tbody tr:nth-child(even) { background: var(--paper); }

/* ---------- gallery ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.gallery-grid figure {
  margin: 0;
  border: 1px solid var(--border);
  background: var(--paper-panel);
  padding: 8px;
}
.gallery-grid figcaption {
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--ink-soft);
  border-top: 1px dashed var(--border);
  padding-top: 8px;
}

/* ---------- FAQ accordion ---------- */
.accordion { display: grid; gap: 10px; }
.accordion-item {
  border: 1px solid var(--border);
  background: var(--paper-panel);
}
.accordion-item h3 { margin: 0; }

.accordion-trigger {
  width: 100%;
  min-height: 44px;
  text-align: left;
  background: transparent;
  border: 0;
  padding: 14px 44px 14px 16px;
  font: inherit;
  font-weight: 700;
  color: var(--steel-dark);
  cursor: pointer;
  position: relative;
}
.accordion-trigger::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent-dark);
  font-size: 1.3rem;
  line-height: 1;
}
.accordion-trigger[aria-expanded="true"]::after { content: "−"; }
.accordion-trigger:hover,
.accordion-trigger:focus-visible {
  color: var(--accent-dark);
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.accordion-panel {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--border);
  margin-top: -1px;
  padding-top: 14px;
}
.accordion-panel p { margin: 0; max-width: 72ch; }

/* ---------- related links ---------- */
.related-section { background: var(--paper-panel); border: 1px solid var(--border); }

/* ---------- CTA ---------- */
.cta-section {
  max-width: 1280px;
  margin: 24px auto 0;
  padding: 40px 20px;
  background: var(--steel-dark);
  color: #F4F5F6;
  text-align: center;
}
.cta-section h2 { color: #FFFFFF; margin: 0 0 10px; }
.cta-section p { margin: 0 auto 20px; max-width: 56ch; color: #C7CCD1; }

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 14px 32px;
  background: var(--accent);
  color: var(--steel-dark);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  border: 3px solid var(--accent);
  letter-spacing: 0.02em;
}
.cta-button:hover, .cta-button:focus-visible {
  background: var(--steel-dark);
  color: var(--accent);
}

/* ---------- footer ---------- */
footer {
  background: var(--steel-dark);
  color: #C7CCD1;
  padding: 40px 20px;
  border-top: 4px solid var(--accent);
}
footer nav {
  max-width: 1280px;
  margin: 0 auto 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}
footer nav a {
  color: #C7CCD1;
  text-decoration: none;
  font-size: 0.9rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
footer nav a:hover, footer nav a:focus-visible { color: var(--accent); }

footer address {
  max-width: 1280px;
  margin: 0 auto;
  font-style: normal;
  font-size: 0.9rem;
  line-height: 1.8;
  color: #9AA1A9;
  padding-top: 16px;
  border-top: 1px solid #4B4F56;
}
footer address a { color: var(--accent); }

footer p {
  max-width: 1280px;
  margin: 16px auto 0;
  font-size: 0.8rem;
  color: #6B7280;
}

/* ---------- breakpoints ---------- */
@media (min-width: 480px) {
  .cta-section { padding: 48px 24px; }
}

@media (min-width: 768px) {
  .hero { grid-template-columns: 1.1fr 0.9fr; align-items: center; padding-top: 64px; }
  .main-nav a { font-size: 0.95rem; }
}

@media (min-width: 1024px) {
  .section { padding: 40px 32px; }
  .hero { padding: 72px 32px 40px; }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1280px) {
  .hero, .section, .header-inner, .cta-section, footer nav, footer address, footer p {
    padding-left: 0;
    padding-right: 0;
  }
}

/* mobile: table becomes card list */
@media (max-width: 767px) {
  .table-wrap { overflow-x: visible; }
  table { min-width: 0; }
  thead { display: none; }
  table, tbody, tr, td { display: block; width: 100%; }
  tr {
    margin-bottom: 12px;
    border: 1px solid var(--border);
  }
  td {
    border: 0;
    border-bottom: 1px dashed var(--border);
    padding: 10px 14px;
  }
  td:last-child { border-bottom: 0; }
  td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-dark);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .accordion-trigger, .header-cta, .cta-button, .main-nav a { transition: color .15s ease, background-color .15s ease, border-color .15s ease; }
}


/* 모바일 하단 고정 CTA 바 (전화/문의) — 번호 텍스트 미노출 */
.mobile-cta-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999;
  display: none;
  box-shadow: 0 -2px 12px rgba(0,0,0,.16);
  padding-bottom: env(safe-area-inset-bottom, 0);
}
@media (max-width: 767px) {
  .mobile-cta-bar {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  body { padding-bottom: 64px; }
}
.mobile-cta-bar a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 56px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  color: #fff;
  background: #3A3F47;
}
.mobile-cta-bar .mobile-cta-contact {
  background: #3A3F47;
  filter: brightness(1.22);
  border-left: 1px solid rgba(255,255,255,.25);
}