/*
스타일 프리셋: Neo-Tech Service Dashboard
컬러 전략: Electric Cyan + Graphite Black + Ice Gray
레이아웃 패턴: Sticky Sidebar (desktop) + Top Tabs (mobile)
섹션 순서 템플릿: Header → Hero → Service Tiers → Process/Tech → Coverage/Visit → Contact Form → Business Info → Footer
아이콘 스타일: Pixel-Precise Outline SVG (각진 라인, 단색 + 포인트 컬러)
배경 패턴: Circuit Grid + Glow Nodes (CSS-only, no images)
*/
:root {
  --cyan: #18f0ff;
  --cyan-soft: rgba(24, 240, 255, 0.2);
  --graphite: #0b0f12;
  --graphite-deep: #070a0d;
  --ice: #e6f1f6;
  --ice-muted: #b7c9d4;
  --slate: #182027;
  --line: rgba(230, 241, 246, 0.15);
  --glow: rgba(24, 240, 255, 0.35);
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --font: "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ice);
  background-color: var(--graphite);
  background-image:
    radial-gradient(circle at 10% 15%, rgba(24, 240, 255, 0.22), transparent 40%),
    radial-gradient(circle at 80% 25%, rgba(24, 240, 255, 0.18), transparent 45%),
    linear-gradient(90deg, rgba(24, 240, 255, 0.07) 1px, transparent 1px),
    linear-gradient(180deg, rgba(24, 240, 255, 0.05) 1px, transparent 1px);
  background-size: 500px 500px, 600px 600px, 48px 48px, 48px 48px;
  background-position: 0 0, 100% 0, 0 0, 0 0;
  min-height: 100vh;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 2px dashed var(--cyan);
  outline-offset: 3px;
}

.site {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.site-header {
  background: linear-gradient(180deg, rgba(11, 15, 18, 0.98), rgba(11, 15, 18, 0.88));
  border-bottom: 1px solid var(--line);
  padding: 18px 20px;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(6px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 44px;
  height: 44px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-sub {
  font-size: 13px;
  color: var(--ice-muted);
}

.nav-toggle {
  margin-top: 14px;
  background: transparent;
  color: var(--ice);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  cursor: pointer;
}

.site-nav {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.site-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  white-space: nowrap;
}

.site-nav a[aria-selected="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 16px rgba(24, 240, 255, 0.2);
}

.site-main {
  padding: 24px 20px 60px;
  display: grid;
  gap: 64px;
}

.section-head h2 {
  margin: 0 0 8px;
  font-size: 28px;
}

.section-head p {
  margin: 0;
  color: var(--ice-muted);
}

.hero {
  display: grid;
  gap: 24px;
  align-items: center;
}

.hero-content h1 {
  font-size: 34px;
  margin: 12px 0 10px;
}

.hero-sub {
  font-size: 18px;
  color: var(--ice-muted);
  margin: 0 0 20px;
}

.eyebrow {
  letter-spacing: 3px;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--cyan);
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.btn {
  background: var(--cyan);
  color: var(--graphite);
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 700;
  border: none;
  cursor: pointer;
}

.btn-outline {
  background: transparent;
  color: var(--cyan);
  border: 1px solid var(--cyan);
}

.hero-points {
  display: grid;
  gap: 10px;
}

.point {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(11, 15, 18, 0.7);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
}

.icon {
  width: 20px;
  height: 20px;
  stroke: var(--cyan);
  fill: none;
}

.hero-visual {
  background: radial-gradient(circle at top, rgba(24, 240, 255, 0.25), transparent 60%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}

.tier-grid {
  display: grid;
  gap: 18px;
}

.tier-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: rgba(11, 15, 18, 0.75);
  box-shadow: var(--shadow);
}

.tier-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.badge {
  background: var(--cyan);
  color: var(--graphite);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
}

.tier-card ul {
  list-style: none;
  padding: 0;
  margin: 14px 0 16px;
  display: grid;
  gap: 8px;
}

.tier-card li::before {
  content: "▹";
  color: var(--cyan);
  margin-right: 8px;
}

.accordion-toggle {
  width: 100%;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ice);
  padding: 10px 14px;
  cursor: pointer;
}

.accordion-panel {
  margin-top: 12px;
  color: var(--ice-muted);
}

.process-grid {
  display: grid;
  gap: 24px;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.steps li {
  display: flex;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: rgba(11, 15, 18, 0.75);
}

.step-num {
  font-weight: 700;
  color: var(--cyan);
}

.tech-cards {
  display: grid;
  gap: 14px;
}

.tech-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: rgba(11, 15, 18, 0.7);
}

.checklist {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: rgba(11, 15, 18, 0.6);
}

.mini-toggle {
  width: 100%;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--cyan);
  padding: 8px 12px;
  cursor: pointer;
}

.mini-panel ul {
  list-style: none;
  padding: 12px 0 0;
  margin: 0;
  display: grid;
  gap: 6px;
}

.coverage-grid {
  display: grid;
  gap: 14px;
}

.coverage-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: rgba(11, 15, 18, 0.7);
}

.contact-grid {
  display: grid;
  gap: 20px;
}

.contact-form {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: rgba(11, 15, 18, 0.75);
}

.field {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.field-full {
  grid-column: 1 / -1;
}

input,
textarea {
  background: rgba(7, 10, 13, 0.8);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  color: var(--ice);
}

.form-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.form-hint {
  color: var(--ice-muted);
  margin: 12px 0 0;
  font-size: 13px;
}

.form-error {
  color: var(--cyan);
  min-height: 20px;
  margin: 8px 0 0;
}

.recent {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: rgba(11, 15, 18, 0.7);
}

.recent ul {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: grid;
  gap: 10px;
}

.recent li {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(7, 10, 13, 0.7);
  font-size: 13px;
}

.export-fallback textarea {
  width: 100%;
  margin-top: 8px;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.info-table th,
.info-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.info-table th {
  text-align: left;
  background: rgba(11, 15, 18, 0.8);
  width: 140px;
}

.site-footer {
  padding: 30px 20px 40px;
  border-top: 1px solid var(--line);
  color: var(--ice-muted);
}

.footer-brand {
  color: var(--ice);
}

@media (min-width: 900px) {
  .site {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  .site-header {
    position: sticky;
    top: 0;
    align-self: start;
    height: 100vh;
    border-right: 1px solid var(--line);
    border-bottom: none;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    flex-direction: column;
    align-items: flex-start;
    border: none;
    margin-top: 24px;
    gap: 8px;
  }

  .site-main {
    padding: 40px 48px 80px;
  }

  .hero {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 32px;
  }

  .hero-content {
    grid-column: 1 / span 7;
  }

  .hero-visual {
    grid-column: 8 / span 5;
  }

  .tier-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .process-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .steps {
    grid-column: 1 / span 7;
  }

  .tech-cards {
    grid-column: 8 / span 5;
  }

  .coverage-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .contact-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .contact-form {
    grid-column: 1 / span 7;
  }

  .recent {
    grid-column: 8 / span 5;
  }
}

@media (max-width: 899px) {
  .site-header[data-open="false"] .site-nav {
    max-height: 0;
    padding-bottom: 0;
    border: none;
    overflow: hidden;
  }

  .site-header[data-open="true"] .site-nav {
    max-height: 200px;
  }
}