/* =============================================================
   큐브앤씨 홈페이지 — 단일 CSS 파일
   Design System: Blue #1E5EC8 + Teal #17A697, Pretendard
   이모지 금지 / 기하학적 기호만 사용
   ============================================================= */

/* ── CSS Custom Properties ── */
:root {
  /* Color */
  --color-primary:      #1E5EC8;
  --color-primary-dark: #1641a0;
  --color-primary-lite: #e8f0fb;
  --color-teal:         #17A697;
  --color-teal-dark:    #0d8c85;
  --color-teal-lite:    #e6f7f5;
  --color-gray-900:     #1a1a2e;
  --color-gray-700:     #374151;
  --color-gray-500:     #6B7280;
  --color-gray-300:     #D1D5DB;
  --color-gray-100:     #F3F4F6;
  --color-gray-50:      #F9FAFB;
  --color-white:        #ffffff;

  /* Gradient */
  --grad-primary:   linear-gradient(135deg, #1E5EC8 0%, #17A697 100%);
  --grad-dark:      linear-gradient(135deg, #1a1a2e 0%, #1E5EC8 100%);
  --grad-hero:      linear-gradient(135deg, #0f1c3f 0%, #1E5EC8 50%, #17A697 100%);

  /* Typography — Pretendard + Inter fallback */
  --font-main: 'Pretendard Variable', 'Pretendard', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs:   0.75rem;   /* 12px */
  --font-size-sm:   0.875rem;  /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg:   1.125rem;  /* 18px */
  --font-size-xl:   1.25rem;   /* 20px */
  --font-size-2xl:  1.5rem;    /* 24px */
  --font-size-3xl:  1.875rem;  /* 30px */
  --font-size-4xl:  2.25rem;   /* 36px */
  --font-size-5xl:  3rem;      /* 48px */

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.10), 0 2px 4px rgba(0,0,0,0.05);
  --shadow-lg:  0 10px 30px rgba(0,0,0,0.12), 0 4px 8px rgba(0,0,0,0.06);
  --shadow-xl:  0 20px 50px rgba(0,0,0,0.15);
  --shadow-primary: 0 8px 24px rgba(30,94,200,0.25);

  /* Layout */
  --container-max: 1200px;
  --nav-height: 72px;

  /* Transition */
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast:   150ms;
  --duration-base:   300ms;
  --duration-slow:   500ms;
}

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-gray-700);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ── Pretendard 폰트 (jsDelivr CDN) ── */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.min.css');

/* ── Container ── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
@media (max-width: 768px) {
  .container { padding: 0 var(--space-4); }
}

/* ── Skip Navigation (접근성) ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  border-radius: var(--radius-md);
  z-index: 9999;
}
.skip-link:focus { top: var(--space-4); }

/* ── HEADER ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-gray-100);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
}
.logo-mark {
  width: 68px;
  height: 36px;
  background: var(--grad-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 800;
  font-size: 11px;
  letter-spacing: 0px;
  white-space: nowrap;
  padding: 0 var(--space-2);
}
.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}
.logo-text span { color: var(--color-gray-700); font-weight: 400; font-size: var(--font-size-sm); margin-left: var(--space-2); }

.site-nav { display: flex; align-items: center; gap: var(--space-8); }
.nav-links { display: flex; gap: var(--space-6); }
.nav-links a {
  color: var(--color-gray-500);
  font-weight: 500;
  font-size: var(--font-size-sm);
  padding: var(--space-2) 0;
  transition: color var(--duration-base) var(--ease-default);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--color-primary);
  transition: width var(--duration-base) var(--ease-default);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  text-decoration: none;
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.btn-nav {
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--font-size-sm);
  transition: background var(--duration-base) var(--ease-default), transform var(--duration-fast);
}
.btn-nav:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
  transform: translateY(-1px);
}

/* 햄버거 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-gray-700);
  border-radius: 2px;
  transition: all var(--duration-base) var(--ease-default);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-100);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-6);
    gap: var(--space-4);
    box-shadow: var(--shadow-md);
  }
  .site-nav.open { display: flex; }
  .nav-links { flex-direction: column; gap: var(--space-3); }
}

/* ── FOOTER ── */
.site-footer {
  background: var(--color-gray-900);
  color: #aab4c8;
  padding: var(--space-16) 0 var(--space-8);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .logo-text { color: var(--color-white); font-size: var(--font-size-lg); }
.footer-brand .logo-text span { color: #aab4c8; }
.footer-tagline {
  margin-top: var(--space-3);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: #7a8ba0;
}
.footer-col h4 {
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col ul a {
  color: #7a8ba0;
  font-size: var(--font-size-sm);
  transition: color var(--duration-base);
}
.footer-col ul a:hover { color: var(--color-white); text-decoration: none; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-8);
  font-size: var(--font-size-xs);
  color: #7a8ba0;
  flex-wrap: wrap;
  gap: var(--space-2);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ── SECTION 공통 ── */
.section { padding: var(--space-24) 0; }
.section--gray { background: var(--color-gray-50); }
.section--dark {
  background: var(--grad-dark);
  color: var(--color-white);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}
.section-label {
  display: inline-block;
  background: var(--color-primary-lite);
  color: var(--color-primary);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}
.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-gray-900);
  letter-spacing: -0.03em;
  line-height: 1.3;
}
.section--dark .section-title { color: var(--color-white); }
.section-subtitle {
  margin-top: var(--space-3);
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  line-height: 1.6;
}
.section--dark .section-subtitle { color: rgba(255,255,255,0.65); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--font-size-base);
  transition: all var(--duration-base) var(--ease-default);
  cursor: pointer;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(30,94,200,0.35);
  text-decoration: none;
  color: var(--color-white);
}
.btn-outline {
  border: 2px solid var(--color-white);
  color: var(--color-white);
}
.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary);
  text-decoration: none;
  transform: translateY(-2px);
}
.btn-teal {
  background: var(--color-teal);
  color: var(--color-white);
}
.btn-teal:hover {
  background: var(--color-teal-dark);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--color-white);
}

/* ── CARDS ── */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-100);
  padding: var(--space-8);
  transition: transform var(--duration-base) var(--ease-default),
              box-shadow var(--duration-base) var(--ease-default);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: var(--font-size-sm);
  letter-spacing: -0.5px;
  color: var(--color-white);
  margin-bottom: var(--space-4);
}
.card-icon--blue   { background: linear-gradient(135deg, #1E5EC8, #17A697); }
.card-icon--teal   { background: linear-gradient(135deg, #17A697, #0d8c85); }
.card-icon--indigo { background: linear-gradient(135deg, #5c4fc2, #1E5EC8); }
.card-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-3);
}
.card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* ── GRID LAYOUTS ── */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }

@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
}

/* ── STAT COUNTERS ── */
.stat-block { text-align: center; padding: var(--space-8); }
.stat-number {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.04em;
  line-height: 1;
}
.stat-unit { font-size: var(--font-size-2xl); }
.stat-label {
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  font-weight: 500;
}

/* ── BADGE / TAG ── */
.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}
.badge--primary { background: var(--color-primary-lite); color: var(--color-primary); }
.badge--teal    { background: var(--color-teal-lite); color: var(--color-teal-dark); }
.badge--dark    { background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.85); }

/* ── DIVIDER ── */
.divider {
  width: 48px; height: 3px;
  background: var(--grad-primary);
  border-radius: var(--radius-full);
  margin: var(--space-4) auto 0;
}
.divider--left { margin-left: 0; }

/* ── TABLE ── */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-size: var(--font-size-sm);
  font-weight: 600;
}
.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-gray-100);
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--color-gray-50); }

/* ── PAGE HERO (서브 페이지용) ── */
.page-hero {
  background: var(--grad-dark);
  color: var(--color-white);
  padding: var(--space-20) 0;
  text-align: center;
}
.page-hero-label {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.9);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}
.page-hero h1 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
}
.page-hero p {
  margin-top: var(--space-4);
  font-size: var(--font-size-lg);
  color: rgba(255,255,255,0.7);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ── SCROLL REVEAL ── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-default),
              transform var(--duration-slow) var(--ease-default);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }

/* ── BEFORE/AFTER COMPARE TABLE ── */
.compare-table { width: 100%; border-collapse: collapse; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.compare-table th {
  padding: var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-align: center;
}
.compare-table th:first-child { background: var(--color-gray-100); color: var(--color-gray-700); width: 28%; }
.compare-table th.before { background: #FEE2E2; color: #991B1B; }
.compare-table th.after  { background: var(--color-primary); color: var(--color-white); }
.compare-table td {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  border-bottom: 1px solid var(--color-gray-100);
  vertical-align: top;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table td.area { font-weight: 600; color: var(--color-gray-700); background: var(--color-gray-50); }
.compare-table td.before { color: #7F1D1D; background: #FFF9F9; }
.compare-table td.after  { color: #0f3d6e; background: #F0F7FF; }

/* ── CONTACT FORM ── */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-gray-700);
}
.form-input, .form-textarea {
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  color: var(--color-gray-700);
  transition: border-color var(--duration-base);
  background: var(--color-white);
}
.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(30,94,200,0.1);
}
.form-textarea { resize: vertical; min-height: 140px; }

/* ── TIMELINE ── */
.timeline { position: relative; padding-left: var(--space-8); }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-teal));
}
.timeline-item { position: relative; padding-bottom: var(--space-8); }
.timeline-dot {
  position: absolute;
  left: calc(-1 * var(--space-8) - 5px);
  top: 4px;
  width: 12px; height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  border: 2px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-primary);
}
.timeline-year {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}
.timeline-content { font-size: var(--font-size-sm); color: var(--color-gray-700); }
.timeline-content ul { margin-top: var(--space-2); display: flex; flex-direction: column; gap: var(--space-1); }
.timeline-content ul li::before { content: '▸ '; color: var(--color-teal); }

/* ── FEATURE LIST ── */
.feature-list { display: flex; flex-direction: column; gap: var(--space-4); }
.feature-item { display: flex; gap: var(--space-4); align-items: flex-start; }
.feature-bullet {
  flex-shrink: 0;
  width: 28px; height: 28px;
  background: var(--color-primary-lite);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 700;
  margin-top: 2px;
}
.feature-text strong { display: block; font-weight: 600; color: var(--color-gray-900); margin-bottom: var(--space-1); }
.feature-text p { font-size: var(--font-size-sm); color: var(--color-gray-500); }

/* ── CERT CARDS ── */
.cert-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: box-shadow var(--duration-base);
}
.cert-card:hover { box-shadow: var(--shadow-md); }
.cert-mark {
  width: 48px; height: 48px;
  background: var(--grad-primary);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-white);
  font-size: var(--font-size-xl);
  font-weight: 800;
}
.cert-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-gray-900);
}
.cert-desc {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* ── CTA STRIP ── */
.cta-strip {
  background: var(--grad-hero);
  padding: var(--space-20) 0;
  text-align: center;
  color: var(--color-white);
}
.cta-strip h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.cta-strip p {
  font-size: var(--font-size-lg);
  color: rgba(255,255,255,0.75);
  margin-bottom: var(--space-8);
}
.cta-buttons { display: flex; gap: var(--space-4); justify-content: center; flex-wrap: wrap; }

/* ── FOCUS (접근성) ── */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
:focus:not(:focus-visible) { outline: none; }

/* ── UTILITY ── */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.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;
}