/* C1SOFT Homepage — base styles */
:root {
  /* C1SOFT brand palette — 명함의 강조 사각형 색 (cobalt blue) 기준 */
  --c1-primary: #3853B7;        /* cobalt blue (명함 강조 사각형) */
  --c1-primary-dark: #2A41A0;   /* hover */
  --c1-primary-light: #EDF1FA;  /* 옅은 cobalt 배경 */
  --c1-accent: #2A52C5;         /* 살짝 더 vibrant 한 cobalt (포인트) */
  --c1-accent-light: #8FB6D9;   /* 라이트 스틸 블루 */
  --c1-text: #1A2333;
  --c1-muted: #6B7280;
  --c1-bg: #FFFFFF;
  --c1-bg-soft: #F0F4F8;
  --c1-border: #DCE3EB;
  --c1-shadow: 0 4px 24px rgba(40, 65, 160, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Noto Sans KR', sans-serif;
  color: var(--c1-text);
  background: var(--c1-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--c1-primary); text-decoration: none; }
a:hover { color: var(--c1-primary-dark); }
img { max-width: 100%; height: auto; display: block; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--c1-border);
  z-index: 100;
}
.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 88px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--c1-text);
  letter-spacing: -0.01em;
}
.logo .mark {
  width: 36px; height: 36px;
  background: url('../img/logo.svg') center/contain no-repeat;
  display: inline-block;
  font-size: 0;            /* "C1" 텍스트는 숨기고 SVG 만 표시 */
  border-radius: 0;
  flex-shrink: 0;
}
.logo-full {
  height: 53px;
  width: auto;
  display: block;
}
.nav { display: flex; gap: 32px; align-items: center; }
.nav a {
  color: var(--c1-text);
  font-weight: 500;
  font-size: 1.05rem;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}
.nav a.active, .nav a:hover {
  color: var(--c1-primary);
  border-bottom-color: var(--c1-primary);
}

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--c1-text); margin: 4px 0;
}

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 88px; right: 0; left: 0;
    background: white; flex-direction: column;
    padding: 16px 24px; gap: 12px;
    border-bottom: 1px solid var(--c1-border);
    display: none;
  }
  .nav.open { display: flex; }
}

/* Hero */
.hero {
  padding: 80px 0 100px;
  background: linear-gradient(135deg, #EDF1FA 0%, #F4F7FB 100%);
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute;
  right: 6%; top: 50%; transform: translateY(-50%);
  width: 360px; height: 240px;
  background: url('../img/cloud-mark.svg') center/contain no-repeat;
  opacity: 0.18;
  pointer-events: none;
}
@media (max-width: 900px) { .hero::after { display: none; } }
.hero .container { position: relative; z-index: 2; }
.hero .eyebrow {
  display: inline-block;
  padding: 6px 14px;
  background: white;
  border: 1px solid var(--c1-border);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--c1-primary);
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  line-height: 1.15;
  margin: 0 0 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero h1 .brand { color: var(--c1-primary); }
.hero .lead {
  font-size: 1.15rem;
  color: var(--c1-muted);
  max-width: 640px;
  margin: 0 0 36px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-primary, .btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.15s;
  cursor: pointer;
  border: 1.5px solid transparent;
}
.btn-primary {
  background: var(--c1-primary);
  color: white !important;
}
.btn-primary:hover { background: var(--c1-primary-dark); transform: translateY(-1px); }
.btn-outline {
  background: white;
  color: var(--c1-text) !important;
  border-color: var(--c1-border);
}
.btn-outline:hover { border-color: var(--c1-primary); color: var(--c1-primary) !important; }

.hero-orbs {
  position: absolute; right: -120px; top: -80px;
  width: 600px; height: 600px;
  opacity: 0.5;
  pointer-events: none;
}
.hero-orbs::before, .hero-orbs::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  background: var(--c1-primary);
  opacity: 0.12;
}
.hero-orbs::before { width: 240px; height: 240px; top: 80px; right: 100px; }
.hero-orbs::after { width: 360px; height: 360px; top: 200px; right: 220px; background: var(--c1-accent); opacity: 0.10; }

/* Sections */
section { padding: 80px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .label {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--c1-primary);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-head h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  margin: 0 0 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.section-head p { color: var(--c1-muted); font-size: 1.05rem; margin: 0; }

.bg-soft { background: var(--c1-bg-soft); }

/* Feature grid (4-up) */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: white;
  border: 1px solid var(--c1-border);
  border-radius: 14px;
  padding: 32px 24px;
  transition: all 0.2s;
}
.feature-card:hover {
  border-color: var(--c1-primary);
  box-shadow: var(--c1-shadow);
  transform: translateY(-2px);
}
.feature-card .icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--c1-primary-light);
  color: var(--c1-primary);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 18px;
}
.feature-card h3 { font-size: 1.1rem; margin: 0 0 10px; font-weight: 700; }
.feature-card p { color: var(--c1-muted); font-size: 0.95rem; margin: 0; }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 32px; text-align: center; }
.stat .value {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--c1-primary);
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat .label { color: var(--c1-muted); font-size: 0.95rem; margin-top: 8px; }

/* Solution: 15 capabilities — grid 3-col */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.cap-card {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: white;
  border: 1px solid var(--c1-border);
  border-radius: 12px;
  transition: all 0.2s;
}
.cap-card:hover { border-color: var(--c1-primary); }
.cap-num {
  flex-shrink: 0;
  width: 36px; height: 36px;
  background: var(--c1-primary);
  color: white;
  border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.95rem;
}
.cap-card h4 { font-size: 1.05rem; margin: 0 0 6px; font-weight: 700; }
.cap-card p { color: var(--c1-muted); font-size: 0.9rem; margin: 0; line-height: 1.5; }

/* Timeline (history) */
.timeline {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute; left: 8px; top: 8px; bottom: 8px;
  width: 2px; background: var(--c1-primary); opacity: 0.3;
}
.tl-item { position: relative; padding: 0 0 36px 24px; }
.tl-item::before {
  content: ''; position: absolute; left: -29px; top: 6px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--c1-primary); border: 4px solid white;
  box-shadow: 0 0 0 2px var(--c1-primary);
}
.tl-year { font-size: 1.4rem; font-weight: 800; color: var(--c1-primary); margin-bottom: 8px; }
.tl-list { list-style: none; padding: 0; margin: 0; }
.tl-list li {
  padding: 4px 0;
  color: var(--c1-text);
  font-size: 0.95rem;
}
.tl-list li::before { content: '· '; color: var(--c1-primary); font-weight: bold; }

/* Tech stack */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.tech-block {
  background: white;
  border: 1px solid var(--c1-border);
  border-radius: 12px;
  padding: 24px;
}
.tech-block h4 {
  font-size: 0.85rem; color: var(--c1-primary); font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em;
  margin: 0 0 12px;
}
.tech-block ul { margin: 0; padding-left: 18px; color: var(--c1-text); }
.tech-block ul li { padding: 3px 0; font-size: 0.95rem; }

/* Clients */
.client-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}
.client-chip {
  background: white;
  border: 1px solid var(--c1-border);
  border-radius: 10px;
  padding: 18px 16px;
  text-align: center;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--c1-text);
  transition: all 0.15s;
}
.client-chip:hover { border-color: var(--c1-primary); color: var(--c1-primary); }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
@media (max-width: 760px) { .contact-grid { grid-template-columns: 1fr; gap: 32px; } }
.contact-info .row {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px solid var(--c1-border);
}
.contact-info .row:last-child { border-bottom: 0; }
.contact-info .ico {
  width: 40px; height: 40px; flex-shrink: 0;
  background: var(--c1-primary-light); color: var(--c1-primary);
  border-radius: 10px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
}
.contact-info .meta .k { color: var(--c1-muted); font-size: 0.85rem; }
.contact-info .meta .v { font-weight: 600; font-size: 1.05rem; margin-top: 2px; }
.form-card {
  background: white;
  border: 1px solid var(--c1-border);
  border-radius: 14px;
  padding: 32px;
}
.form-card label {
  display: block;
  font-size: 0.9rem;
  color: var(--c1-text);
  font-weight: 600;
  margin: 16px 0 6px;
}
.form-card input, .form-card textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--c1-border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--c1-bg-soft);
  transition: border-color 0.15s;
}
.form-card input:focus, .form-card textarea:focus {
  outline: none; border-color: var(--c1-primary); background: white;
}
.form-card textarea { resize: vertical; min-height: 120px; }
.form-card .submit { margin-top: 24px; width: 100%; justify-content: center; }
.form-note { font-size: 0.8rem; color: var(--c1-muted); margin-top: 12px; }

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, var(--c1-primary) 0%, var(--c1-primary-dark) 100%);
  color: white;
  padding: 64px 0;
  text-align: center;
}
.cta-band h2 { color: white; margin: 0 0 12px; font-size: 2rem; font-weight: 800; }
.cta-band p { color: rgba(255,255,255,0.9); margin: 0 0 28px; font-size: 1.1rem; }
.cta-band .btn-primary {
  background: white; color: var(--c1-primary) !important;
}
.cta-band .btn-primary:hover { background: #F5F6FA; }

/* Footer */
footer {
  background: #1F2733;
  color: #B8C0CC;
  padding: 48px 0 24px;
  font-size: 1rem;
}
.footer-brand {
  display: inline-block;
  margin-bottom: 14px;
}
.footer-brand .logo-full { height: 38px; }
footer .footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
@media (max-width: 760px) { footer .footer-grid { grid-template-columns: 1fr; } }
footer h5 { color: white; font-size: 1.05rem; font-weight: 700; margin: 0 0 16px; letter-spacing: 0.05em; text-transform: uppercase; }
footer ul { list-style: none; padding: 0; margin: 0; }
footer ul li { padding: 6px 0; font-size: 1rem; }
footer ul a { color: #B8C0CC; }
footer ul a:hover { color: white; }
.copy {
  border-top: 1px solid #3A4252;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: #8A93A4;
}
.draft-banner {
  background: #FEF3C7;
  border-bottom: 1px solid #F59E0B;
  color: #92400E;
  text-align: center;
  padding: 8px 24px;
  font-size: 0.85rem;
}

/* Slide thumbnail button (PDF page preview, opens lightbox) */
.slide-thumb {
  display: block;
  margin-top: 14px;
  border: 1px solid var(--c1-border);
  border-radius: 10px;
  overflow: hidden;
  cursor: zoom-in;
  background: white;
  padding: 0;
  width: 100%;
  transition: all 0.2s;
  position: relative;
}
.slide-thumb:hover {
  border-color: var(--c1-primary);
  transform: translateY(-1px);
  box-shadow: var(--c1-shadow);
}
.slide-thumb img {
  display: block;
  width: 100%;
  height: auto;
}
.slide-thumb::after {
  content: '🔍 클릭하여 확대';
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(20, 28, 50, 0.78);
  color: white;
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 999px;
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
}
.slide-thumb:hover::after { opacity: 1; }

/* Lightbox overlay */
.lb-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(20, 28, 50, 0.94);
  z-index: 9999;
  align-items: center; justify-content: center;
  padding: 40px 60px;
}
.lb-overlay.open { display: flex; }
.lb-overlay .lb-img {
  max-width: 96vw; max-height: 88vh;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  background: #f0f0f0;
}
.lb-close, .lb-nav {
  position: absolute;
  background: rgba(255,255,255,0.12);
  border: 0;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
  font-family: inherit;
}
.lb-close { top: 20px; right: 24px; width: 44px; height: 44px; font-size: 1.3rem; }
.lb-nav { top: 50%; transform: translateY(-50%); width: 52px; height: 52px; font-size: 1.8rem; line-height: 1; }
.lb-nav.prev { left: 24px; }
.lb-nav.next { right: 24px; }
.lb-close:hover, .lb-nav:hover { background: rgba(255,255,255,0.22); }
.lb-counter {
  position: absolute;
  bottom: 24px; left: 50%; transform: translateX(-50%);
  color: white;
  font-size: 0.88rem;
  background: rgba(255,255,255,0.12);
  padding: 6px 16px;
  border-radius: 999px;
}
.lb-title {
  position: absolute;
  top: 28px; left: 50%; transform: translateX(-50%);
  color: white;
  font-size: 0.95rem;
  max-width: 70vw;
  text-align: center;
  background: rgba(255,255,255,0.08);
  padding: 6px 18px;
  border-radius: 999px;
}
@media (max-width: 700px) {
  .lb-overlay { padding: 16px; }
  .lb-nav { width: 38px; height: 38px; font-size: 1.3rem; }
  .lb-nav.prev { left: 8px; }
  .lb-nav.next { right: 8px; }
  .lb-close { top: 8px; right: 8px; width: 36px; height: 36px; }
  .lb-title { top: 12px; font-size: 0.78rem; max-width: calc(100vw - 100px); }
  .lb-counter { bottom: 12px; font-size: 0.78rem; }
}

/* Page header (sub pages) */
.page-head {
  background: linear-gradient(135deg, var(--c1-primary-light), #F8F9FE);
  padding: 80px 0 60px;
  text-align: center;
}
.page-head h1 {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  margin: 0 0 12px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.page-head p { color: var(--c1-muted); margin: 0; font-size: 1.05rem; }