/* 한국안전기술원(KSTI) — 공통 뼈대 (색·글꼴·머리글·바닥글·버튼) */

:root {
  --navy: #0e2a47;
  --navy-deep: #0a1f36;
  --navy-soft: #1d4571;
  --accent: #ef5b13;
  --accent-dark: #d34a07;
  --ink: #1c2530;
  --ink-soft: #5b6b7d;
  --paper: #f4f6f9;
  --card: #ffffff;
  --line: #dde3ea;
  --radius: 10px;
  --shadow: 0 2px 10px rgba(14, 42, 71, .06);
  --shadow-lg: 0 10px 28px rgba(14, 42, 71, .12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 14px; }

.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }

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

.skip-link:focus {
  position: fixed; top: 12px; left: 12px; width: auto; height: auto;
  clip: auto; padding: 10px 16px; background: var(--navy); color: #fff; z-index: 200;
}

/* ── 머리글 ── */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 100;
}

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px; padding: 12px 0;
}

.logo { display: flex; align-items: center; }
.logo-img { height: 48px; width: auto; }

.nav-toggle {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--paper); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px 12px; font: inherit; font-size: 14px;
  color: var(--navy); cursor: pointer;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  display: block; width: 16px; height: 2px; background: var(--navy); content: "";
}

.nav-toggle-bar { position: relative; }
.nav-toggle-bar::before { position: absolute; top: -5px; left: 0; }
.nav-toggle-bar::after { position: absolute; top: 5px; left: 0; }

.main-nav {
  display: none; width: 100%; flex-direction: column;
  padding: 8px 0 4px; border-top: 1px solid var(--line);
}

.main-nav.open { display: flex; }

.main-nav > a,
.nav-group-btn {
  display: block; width: 100%; text-align: left;
  padding: 11px 4px; font-size: 16px; font-weight: 500;
  background: none; border: 0; border-bottom: 1px solid var(--line);
  color: var(--ink); font-family: inherit; cursor: pointer;
}

.main-nav > a.active,
.nav-group-btn[aria-expanded="true"] { color: var(--accent); }

.caret {
  display: inline-block; width: 0; height: 0; margin-left: 8px;
  border-left: 4px solid transparent; border-right: 4px solid transparent;
  border-top: 5px solid currentColor; vertical-align: middle;
}

.nav-drop { display: none; padding: 4px 0 8px 10px; }
.nav-group.open .nav-drop { display: block; }

.nav-drop a {
  display: block; padding: 9px 4px; font-size: 15px; color: var(--ink-soft);
  border-bottom: 1px dashed var(--line);
}

.nav-cta {
  margin-top: 10px; text-align: center;
  background: var(--accent); color: #fff !important;
  border-radius: 8px; padding: 12px 16px !important;
  border-bottom: 0 !important; font-weight: 700;
}

/* ── 버튼 ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 22px; border-radius: 8px; font-weight: 700; font-size: 16px;
  border: 1px solid transparent; cursor: pointer;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { background: rgba(255, 255, 255, .08); color: #fff; border-color: rgba(255, 255, 255, .5); }
.btn-ghost:hover { background: rgba(255, 255, 255, .18); }
.btn-block { width: 100%; }

/* ── 첫 화면 ── */
.hero {
  background: linear-gradient(160deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: #fff; padding: 56px 0 44px;
}

.hero-badge {
  display: inline-block; margin: 0 0 16px;
  padding: 6px 14px; border-radius: 999px;
  background: rgba(255, 255, 255, .12);
  font-size: 13px; letter-spacing: .04em;
}

.hero h1 {
  margin: 0 0 16px; font-size: 30px; line-height: 1.35; font-weight: 900;
  word-break: keep-all;
}

.hero-lead { color: rgba(255, 255, 255, .86); max-width: 44em; margin-bottom: 24px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.hero-certs {
  list-style: none; margin: 26px 0 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: 8px;
}

.hero-certs li {
  font-size: 13px; padding: 6px 12px; border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .3); color: rgba(255, 255, 255, .92);
}

/* ── 구역 ── */
.section { padding: 44px 0; }
.section-alt { background: #fff; }

.section-title {
  margin: 0 0 10px; font-size: 24px; font-weight: 900; color: var(--navy);
  word-break: keep-all;
}

.section-lead { color: var(--ink-soft); margin-bottom: 24px; }
.muted { color: var(--ink-soft); font-size: 14px; }

/* ── 카드 묶음 ── */
.area-grid, .cert-grid, .strength-grid, .service-grid {
  display: grid; gap: 14px; grid-template-columns: 1fr;
}

.area-card, .cert-card, .strength-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}

.area-no {
  margin: 0 0 6px; font-size: 13px; font-weight: 700; letter-spacing: .08em;
  color: var(--accent);
}

.area-card h3, .cert-card h3, .strength-card h3 {
  margin: 0 0 8px; font-size: 18px; color: var(--navy); word-break: keep-all;
}

.area-summary, .cert-card p, .strength-card p {
  margin: 0; color: var(--ink-soft); font-size: 15px;
}

.area-items { list-style: none; margin: 12px 0 0; padding: 0; }
.area-items li { border-top: 1px solid var(--line); }
.area-items a { display: block; padding: 10px 0; font-size: 15px; }
.area-items a:hover { color: var(--accent); }

/* ── 문의 구역 ── */
.section-contact { background: var(--navy); color: #fff; }
.contact-inner { display: grid; gap: 18px; }
.section-contact h2 { margin: 0 0 8px; font-size: 22px; }
.section-contact p { color: rgba(255, 255, 255, .86); margin: 0 0 6px; }
.section-contact .muted { color: rgba(255, 255, 255, .62); }
.btn-mail { word-break: break-all; }

/* ── 화면 머리 ── */
.page-head {
  background: #fff; border-bottom: 1px solid var(--line); padding: 34px 0 30px;
}

.page-badge {
  margin: 0 0 8px; font-size: 13px; font-weight: 700; letter-spacing: .1em;
  color: var(--accent); text-transform: uppercase;
}

.page-head h1 {
  margin: 0 0 10px; font-size: 26px; font-weight: 900; color: var(--navy);
  word-break: keep-all;
}

.page-head-en { font-size: 15px; font-weight: 700; color: var(--ink-soft); }
.page-lead { margin: 0; color: var(--ink-soft); max-width: 48em; word-break: keep-all; }

.breadcrumb { font-size: 13px; color: var(--ink-soft); margin-bottom: 12px; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 6px; }

/* ── 사업분야 화면 ── */
.area-block { margin-bottom: 34px; }

.area-block-head {
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--accent);
  border-radius: var(--radius); padding: 18px 20px; margin-bottom: 14px;
}

.area-block-head h2 {
  margin: 0 0 8px; font-size: 21px; color: var(--navy); word-break: keep-all;
}

.area-lead { margin: 8px 0 0; color: var(--ink-soft); font-size: 15px; }

.service-card {
  display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow);
}

.service-card:hover { border-color: var(--accent); box-shadow: var(--shadow-lg); }
.service-card h3 { margin: 0 0 8px; font-size: 17px; color: var(--navy); word-break: keep-all; }
.service-card p { margin: 0 0 12px; color: var(--ink-soft); font-size: 15px; }
.service-more { margin-top: auto; color: var(--accent); font-size: 14px; font-weight: 700; }

/* ── 사업 상세 화면 ── */
.detail-grid { display: grid; gap: 22px; grid-template-columns: 1fr; }

.detail-lead {
  font-size: 17px; color: var(--ink); border-left: 3px solid var(--accent);
  padding-left: 14px; margin-bottom: 22px; word-break: keep-all;
}

.check-list { list-style: none; margin: 0 0 26px; padding: 0; }
.check-list li {
  position: relative; padding: 10px 0 10px 26px; border-bottom: 1px solid var(--line);
  font-size: 15px;
}

.check-list li::before {
  content: "✓"; position: absolute; left: 2px; top: 10px;
  color: var(--accent); font-weight: 700;
}

.detail-section { margin-bottom: 26px; }
.detail-section h2 {
  margin: 0 0 12px; font-size: 19px; color: var(--navy); word-break: keep-all;
}

.detail-section p { color: #33414f; }

.side-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; margin-bottom: 14px;
}

.side-card h3 {
  margin: 0 0 12px; font-size: 16px; color: var(--navy);
  padding-bottom: 8px; border-bottom: 1px solid var(--line);
}

.step-list { margin: 0; padding-left: 20px; color: #33414f; font-size: 15px; }
.step-list li { margin-bottom: 6px; }

.plain-list { list-style: none; margin: 0; padding: 0; color: #33414f; font-size: 15px; }
.plain-list li { padding: 6px 0 6px 14px; position: relative; }
.plain-list li::before { content: "·"; position: absolute; left: 2px; color: var(--accent); font-weight: 700; }

.law-note {
  font-size: 13px; color: var(--ink-soft); background: #eef2f7;
  border-radius: 8px; padding: 12px 14px; margin: 0 0 14px; word-break: keep-all;
}

/* ── 회사소개 화면 ── */
.about-grid { display: grid; gap: 24px; grid-template-columns: 1fr; }
.about-text p { color: #33414f; word-break: keep-all; }

.about-side {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; height: fit-content;
}

.about-side h3 { margin: 0 0 14px; font-size: 17px; color: var(--navy); }

.info-list { margin: 0; }
.info-list dt {
  font-size: 13px; font-weight: 700; color: var(--accent); margin-top: 12px;
}
.info-list dd { margin: 2px 0 0; font-size: 15px; color: #33414f; word-break: keep-all; }
.info-list dd a { color: var(--navy); text-decoration: underline; }

/* ── 바닥글 ── */
.site-footer {
  background: var(--navy-deep); color: rgba(255, 255, 255, .85);
  padding: 34px 0 22px;
}

.footer-grid { display: grid; gap: 22px; grid-template-columns: 1fr; }
.footer-logo { margin: 0 0 6px; font-size: 18px; font-weight: 900; color: #fff; }
.footer-note { margin: 0 0 6px; font-size: 14px; color: rgba(255, 255, 255, .74); word-break: keep-all; }

.footer-label {
  margin: 0 0 10px; font-size: 13px; font-weight: 700; letter-spacing: .06em;
  color: var(--accent);
}

.footer-list { list-style: none; margin: 0; padding: 0; font-size: 14px; }
.footer-list li { margin-bottom: 6px; color: rgba(255, 255, 255, .78); }
.footer-list a:hover, .footer-mail:hover { color: #fff; text-decoration: underline; }
.footer-mail { color: #fff; font-weight: 700; }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .14); margin-top: 24px; padding-top: 16px;
  display: grid; gap: 6px;
}

.footer-bottom .footer-note { margin: 0; }
.copyright { margin: 0; font-size: 13px; color: rgba(255, 255, 255, .55); }

/* ── 오른쪽 아래 문의 단추 ── */
.mail-dock {
  position: fixed; right: 16px; bottom: 16px; z-index: 120;
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #fff; padding: 13px 18px;
  border-radius: 999px; font-weight: 700; font-size: 15px;
  box-shadow: var(--shadow-lg);
}

.mail-dock:hover { background: var(--accent-dark); }

/* ── 넓은 화면 ── */
@media (min-width: 700px) {
  .area-grid, .cert-grid, .strength-grid, .service-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-inner { grid-template-columns: 1fr auto; align-items: center; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
  .footer-bottom { grid-template-columns: 1fr auto; }
  .hero { padding: 76px 0 62px; }
  .hero h1 { font-size: 40px; }
}

@media (min-width: 1000px) {
  .header-inner { flex-wrap: nowrap; }
  .nav-toggle { display: none; }

  .main-nav {
    display: flex; width: auto; flex-direction: row; align-items: center;
    gap: 2px; border-top: 0; padding: 0;
  }

  .main-nav > a { width: auto; border-bottom: 0; padding: 10px 12px; font-size: 15px; }

  .nav-group { position: relative; }
  .nav-group-btn { width: auto; border-bottom: 0; padding: 10px 12px; font-size: 15px; }

  .nav-drop {
    display: none; position: absolute; top: 100%; left: 0; min-width: 270px;
    background: #fff; border: 1px solid var(--line); border-radius: 10px;
    box-shadow: var(--shadow-lg); padding: 8px;
  }

  .nav-group:hover .nav-drop,
  .nav-group:focus-within .nav-drop,
  .nav-group.open .nav-drop { display: block; }

  .nav-drop a { border-bottom: 0; padding: 10px 12px; border-radius: 6px; }
  .nav-drop a:hover { background: var(--paper); color: var(--accent); }

  .nav-cta { margin: 0 0 0 8px; padding: 10px 18px !important; }

  .area-grid, .cert-grid, .strength-grid { grid-template-columns: repeat(4, 1fr); }
  .service-grid { grid-template-columns: repeat(3, 1fr); }
  .detail-grid { grid-template-columns: minmax(0, 1fr) 340px; align-items: start; }
  .detail-side { position: sticky; top: 92px; }
  .about-grid { grid-template-columns: minmax(0, 1fr) 320px; }
}

/* ── 휴대폰 (360~430px) ── */
@media (max-width: 640px) {
  body { font-size: 15px; }
  .wrap { width: calc(100% - 24px); }
  .logo-img { height: 38px; }

  .hero { padding: 40px 0 34px; }
  .hero h1 { font-size: 25px; }
  .hero-actions .btn { width: 100%; }

  .section { padding: 32px 0; }
  .section-title { font-size: 21px; }
  .page-head { padding: 26px 0 22px; }
  .page-head h1 { font-size: 22px; }

  .area-card, .cert-card, .strength-card, .service-card, .side-card, .about-side { padding: 16px; }
  .btn { width: 100%; }
  .btn-mail { font-size: 15px; }

  .mail-dock { padding: 14px; }
  .mail-dock-text { display: none; }

  .footer-grid { gap: 18px; }
}