/* ============================================================
   바인데이타 주식회사 — 신뢰형 기업 블루 디자인 시스템
   ============================================================ */

/* ---- 1. 디자인 토큰 ---- */
:root {
  --c-navy:       #002F6C;
  --c-blue:       #0057B8;
  --c-blue-600:   #0066D6;
  --c-blue-light: #2E7DD1;
  --c-accent:     #00A0E9;
  --c-ink:        #16202E;
  --c-gray:       #5A6473;
  --c-gray-light: #8A93A2;
  --c-line:       #E3E8EF;
  --c-bg:         #FFFFFF;
  --c-bg-soft:    #F4F8FC;
  --c-bg-navy:    #0A2547;

  --radius:    14px;
  --radius-sm: 9px;
  --shadow:    0 10px 30px rgba(0, 47, 108, .08);
  --shadow-lg: 0 20px 50px rgba(0, 47, 108, .14);

  --container: 1140px;
  --font: "Pretendard", "Pretendard Variable", -apple-system, BlinkMacSystemFont,
          system-ui, "Segoe UI", Roboto, "Helvetica Neue", "Apple SD Gothic Neo",
          "Malgun Gothic", sans-serif;
}

/* ---- 2. 리셋 & 베이스 ---- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.7;
  letter-spacing: -.01em;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--c-blue); text-decoration: none; }
a:hover { color: var(--c-navy); }
ul { list-style: none; padding: 0; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; letter-spacing: -.02em; }

/* ---- 3. 레이아웃 ---- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 84px 0; }
.section-soft { background: var(--c-bg-soft); }
.section-navy { background: var(--c-bg-navy); color: #fff; }
main { display: block; }

.section-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.section-head.left { margin-left: 0; text-align: left; }
.eyebrow {
  display: inline-block; font-size: .82rem; font-weight: 700; letter-spacing: .08em;
  color: var(--c-blue); text-transform: uppercase; margin-bottom: 14px;
}
.section-navy .eyebrow { color: var(--c-accent); }
.section-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
.section-head p { margin-top: 16px; color: var(--c-gray); font-size: 1.05rem; }
.section-navy .section-head p { color: #b9c7da; }

/* ---- 4. 버튼 ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px; border-radius: 999px; font-weight: 700; font-size: 1rem;
  border: 1.5px solid transparent; cursor: pointer; transition: .18s ease; white-space: nowrap;
}
.btn-sm { padding: 9px 18px; font-size: .92rem; }
.btn-primary { background: var(--c-blue); color: #fff; }
.btn-primary:hover { background: var(--c-navy); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.5); }
.btn-ghost:hover { background: rgba(255,255,255,.12); color: #fff; }
.btn-outline { background: #fff; color: var(--c-blue); border-color: var(--c-line); }
.btn-outline:hover { border-color: var(--c-blue); color: var(--c-navy); }

/* ---- 5. 헤더 / 네비 ---- */
.site-header {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--c-line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; flex-direction: column; line-height: 1.1; }
.brand-mark { font-size: 1.35rem; font-weight: 800; letter-spacing: -.03em; color: var(--c-navy); }
.brand-mark b { color: var(--c-blue); font-weight: 800; }
.brand-sub { font-size: .68rem; font-weight: 600; letter-spacing: .04em; color: var(--c-gray-light); margin-top: 2px; }

.site-nav ul { display: flex; align-items: center; gap: 6px; }
.site-nav a:not(.btn) {
  display: block; padding: 10px 14px; font-weight: 600; color: var(--c-ink); border-radius: 8px;
}
.site-nav a:not(.btn):hover { background: var(--c-bg-soft); color: var(--c-blue); }
.site-nav a.active { color: var(--c-blue); }
.nav-cta { margin-left: 8px; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; width: 44px; height: 44px;
  background: none; border: 0; cursor: pointer; padding: 10px;
}
.nav-toggle span { height: 2px; background: var(--c-navy); border-radius: 2px; transition: .2s; }

/* ---- 6. 히어로 ---- */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background: linear-gradient(135deg, var(--c-navy) 0%, var(--c-blue) 60%, var(--c-blue-light) 100%);
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(620px 360px at 85% 12%, rgba(0,160,233,.38), transparent 70%),
    radial-gradient(500px 300px at 8% 90%, rgba(255,255,255,.10), transparent 70%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; padding: 104px 0 96px; max-width: 760px; }
.hero .badge-row { margin-bottom: 22px; }
.hero h1 { font-size: clamp(2.1rem, 5.2vw, 3.4rem); line-height: 1.22; letter-spacing: -.03em; }
.hero h1 .hl { color: #9FE0FF; }
.hero p.lead { margin-top: 22px; font-size: clamp(1.05rem, 2.2vw, 1.25rem); color: #d7e3f3; max-width: 600px; }
.hero-actions { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 40px; padding: 28px 0 0; border-top: 1px solid rgba(255,255,255,.18); margin-top: 56px; }
.hero-stats .stat strong { display: block; font-size: 1.9rem; font-weight: 800; color: #fff; }
.hero-stats .stat span { font-size: .9rem; color: #b9c7da; }

/* ---- 7. 배지 ---- */
.badge {
  display: inline-flex; align-items: center; gap: 7px; padding: 7px 15px; border-radius: 999px;
  font-size: .82rem; font-weight: 700; background: rgba(255,255,255,.14); color: #fff;
  border: 1px solid rgba(255,255,255,.22);
}
.badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: #4ade80; }
.badge-row { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---- 8. 카드 그리드 ---- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 32px 28px; transition: .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card .ic {
  width: 52px; height: 52px; border-radius: 13px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--c-blue), var(--c-accent)); color: #fff; margin-bottom: 18px;
}
.card .ic svg { width: 26px; height: 26px; }
.card h3 { font-size: 1.22rem; margin-bottom: 10px; }
.card p { color: var(--c-gray); font-size: .98rem; }
.card .card-tag { display: inline-block; margin-bottom: 14px; font-size: .76rem; font-weight: 700; color: var(--c-blue); background: #EAF3FF; padding: 4px 11px; border-radius: 999px; }
a.card { color: var(--c-ink); display: block; }
a.card h3 { color: var(--c-ink); }
.card .more { display: inline-block; margin-top: 16px; font-weight: 700; color: var(--c-blue); font-size: .92rem; }
a.card:hover .more { color: var(--c-navy); }

/* 상품 카드 (KT 라인업) */
.product { display: flex; flex-direction: column; height: 100%; }
.product .cat { font-size: .78rem; font-weight: 700; color: var(--c-accent); letter-spacing: .04em; }
.product h3 { margin: 6px 0 10px; font-size: 1.3rem; }
.product .feat { margin-top: 16px; display: grid; gap: 9px; }
.product .feat li { position: relative; padding-left: 24px; color: var(--c-gray); font-size: .94rem; }
.product .feat li::before {
  content: ""; position: absolute; left: 0; top: .55em; width: 13px; height: 7px;
  border-left: 2px solid var(--c-blue); border-bottom: 2px solid var(--c-blue);
  transform: rotate(-45deg);
}
.product .pin { margin-top: auto; }
.product .tag-hot { align-self: flex-start; background: var(--c-navy); color: #fff; font-size: .72rem; font-weight: 700; padding: 4px 11px; border-radius: 999px; margin-bottom: 14px; }

/* ---- 9. 신뢰 지표 띠 ---- */
.trustbar { background: #fff; border-bottom: 1px solid var(--c-line); }
.trustbar .row { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px 40px; padding: 22px 0; }
.trustbar .item { display: flex; align-items: center; gap: 9px; font-weight: 600; color: var(--c-gray); font-size: .95rem; }
.trustbar .item svg { width: 20px; height: 20px; color: var(--c-blue); }

/* ---- 10. feature 리스트 (아이콘+텍스트) ---- */
.feature-list { display: grid; gap: 22px; }
.feature-list .fi { display: flex; gap: 16px; }
.feature-list .fi .n { flex: none; width: 38px; height: 38px; border-radius: 10px; background: #EAF3FF; color: var(--c-blue); font-weight: 800; display: grid; place-items: center; }
.feature-list .fi h4 { font-size: 1.08rem; margin-bottom: 5px; }
.feature-list .fi p { color: var(--c-gray); font-size: .96rem; }

/* 2단 split */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split h2 { font-size: clamp(1.6rem, 3.2vw, 2.2rem); margin-bottom: 18px; }
.split .lead { color: var(--c-gray); font-size: 1.05rem; margin-bottom: 26px; }

/* 패널 (네이비 위 카드) */
.panel { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14); border-radius: var(--radius); padding: 30px; }
.section-navy .feature-list .fi .n { background: rgba(255,255,255,.12); color: #fff; }
.section-navy .feature-list .fi p { color: #b9c7da; }
.section-navy .card { background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.14); }
.section-navy .card h3 { color: #fff; }
.section-navy .card p { color: #b9c7da; }

/* ---- 11. CTA 밴드 ---- */
.cta-band { background: linear-gradient(120deg, var(--c-navy), var(--c-blue)); color: #fff; border-radius: 20px; padding: 56px 48px; text-align: center; }
.cta-band h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); }
.cta-band p { margin: 14px auto 30px; color: #d7e3f3; max-width: 560px; }
.cta-band .hero-actions { justify-content: center; }

/* ---- 12. 페이지 헤더 (내부 페이지) ---- */
.page-hero { background: linear-gradient(135deg, var(--c-navy), var(--c-blue)); color: #fff; padding: 76px 0 64px; }
.page-hero .eyebrow { color: var(--c-accent); }
.page-hero h1 { font-size: clamp(1.9rem, 4.4vw, 2.8rem); }
.page-hero p { margin-top: 16px; color: #d7e3f3; max-width: 620px; font-size: 1.08rem; }
.breadcrumb { font-size: .86rem; color: #9fb4d0; margin-bottom: 16px; }
.breadcrumb a { color: #cddcf0; }

/* 본문 산문 */
.prose h2 { font-size: 1.6rem; margin: 8px 0 16px; }
.prose h3 { font-size: 1.2rem; margin: 28px 0 10px; }
.prose p { color: var(--c-gray); margin-bottom: 14px; }
ul.bullets { display: grid; gap: 10px; margin: 14px 0; }
ul.bullets li { position: relative; padding-left: 26px; color: var(--c-gray); }
ul.bullets li::before { content: ""; position: absolute; left: 2px; top: .5em; width: 13px; height: 7px; border-left: 2px solid var(--c-blue); border-bottom: 2px solid var(--c-blue); transform: rotate(-45deg); }

/* 요금/스펙 테이블 */
.spec-table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: .96rem; }
.spec-table th, .spec-table td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--c-line); }
.spec-table th { background: var(--c-bg-soft); font-weight: 700; width: 32%; color: var(--c-ink); }
.spec-table td { color: var(--c-gray); }
.note { font-size: .88rem; color: var(--c-gray-light); margin-top: 8px; }

/* ---- 13. 폼 ---- */
.form-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); }
.field { margin-bottom: 20px; }
.field label { display: block; font-weight: 700; font-size: .94rem; margin-bottom: 8px; }
.field label .req { color: #e1483a; }
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 15px; border: 1.5px solid var(--c-line); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 1rem; color: var(--c-ink); background: #fff; transition: .15s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--c-blue); box-shadow: 0 0 0 3px rgba(0,87,184,.12); }
.field textarea { resize: vertical; min-height: 130px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-consent { display: flex; gap: 10px; align-items: flex-start; font-size: .9rem; color: var(--c-gray); }
.form-consent input { width: auto; margin-top: 4px; }

.contact-aside { display: grid; gap: 16px; }
.contact-aside .ci { display: flex; gap: 14px; align-items: flex-start; padding: 20px; background: var(--c-bg-soft); border-radius: var(--radius); }
.contact-aside .ci .ic { flex: none; width: 42px; height: 42px; border-radius: 11px; background: var(--c-blue); color: #fff; display: grid; place-items: center; }
.contact-aside .ci h4 { font-size: 1rem; margin-bottom: 3px; }
.contact-aside .ci p { color: var(--c-gray); font-size: .94rem; }

/* ---- 14. 푸터 ---- */
.site-footer { background: var(--c-bg-navy); color: #c4d2e4; padding-top: 60px; font-size: .94rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.4fr; gap: 40px; padding-bottom: 44px; }
.footer-brand .brand-mark { color: #fff; font-size: 1.4rem; }
.footer-brand .brand-mark b { color: var(--c-accent); }
.footer-brand p { margin-top: 14px; color: #93a6c0; }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { color: #c4d2e4; }
.footer-col a:hover { color: #fff; }
.footer-company li { color: #93a6c0; }
.footer-company .muted { color: #6f82a0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.10); padding: 20px 0; }
.footer-bottom p { color: #7e91ad; font-size: .86rem; }
.muted { color: var(--c-gray-light); }

/* 유틸 */
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.lead-block { max-width: 760px; }

/* ---- 15. 반응형 ---- */
@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .section { padding: 60px 0; }
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed; inset: 72px 0 auto 0; background: #fff; border-bottom: 1px solid var(--c-line);
    transform: translateY(-120%); transition: transform .25s ease; box-shadow: var(--shadow);
  }
  body.nav-open .site-nav { transform: translateY(0); }
  .site-nav ul { flex-direction: column; align-items: stretch; gap: 0; padding: 12px 16px 20px; }
  .site-nav a:not(.btn) { padding: 14px 12px; border-radius: 8px; }
  .nav-cta { margin: 8px 0 0; }
  .nav-cta .btn { width: 100%; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .cta-band { padding: 44px 24px; }
  .hero-stats { gap: 24px; }
}