:root {
  /*
  Design DNA (이번 생성용 – 고정)
  스타일 프리셋: Minimal Urban Studio
  컬러 전략: Warm Gray Base + Charcoal Text + Single Accent (Forest Green)
  레이아웃 패턴: Dual-Track Layout (Desktop vs Mobile) + Minimal Tabs
  섹션 순서 템플릿: Header → Hero → Platforms (Desktop/Mobile Tabs) → Services → About → Contact/Location → Business Info → Footer
  아이콘 스타일: Minimal Outline Icon (SVG, sharp + restrained)
  배경 패턴: Subtle City Grid Lines (SVG, very low contrast)
  */
  --warm-gray: #f2eee8;
  --warm-gray-deep: #e6e0d8;
  --charcoal: #2a2a2a;
  --charcoal-soft: #3a3a3a;
  --forest: #1f4f3a;
  --forest-soft: #2a6b4f;
  --line: #cfc7bd;
  --white: #ffffff;
  --shadow: 0 10px 30px rgba(42, 42, 42, 0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 14px;
  --space-4: 20px;
  --space-5: 28px;
  --space-6: 36px;
  --space-7: 48px;
  --space-8: 64px;
  --max-width: 1120px;
  --font-sans: "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", "Segoe UI", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--charcoal);
  background: var(--warm-gray);
  line-height: 1.6;
}

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--forest);
  outline-offset: 3px;
}

.container {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.section {
  padding: var(--space-8) 0;
}

.section-title {
  font-size: clamp(1.4rem, 2vw, 1.9rem);
  margin-bottom: var(--space-5);
  letter-spacing: 0.02em;
}

.dual-track {
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 900px) {
  .dual-track {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(242, 238, 232, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.logo img {
  width: 44px;
  height: 44px;
}

.nav-links {
  display: flex;
  gap: var(--space-5);
  align-items: center;
}

.nav-links a {
  font-size: 0.95rem;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  background: var(--forest);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: var(--space-2) var(--space-3);
  font-size: 0.9rem;
}

@media (max-width: 860px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    padding: var(--space-4) var(--space-5);
    background: var(--warm-gray);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    border-bottom: 1px solid var(--line);
    display: none;
  }

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

.hero {
  background: var(--warm-gray);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180' viewBox='0 0 180 180'><g fill='none' stroke='%23d9d3cb' stroke-width='1' opacity='0.35'><path d='M0 30h180M0 90h180M0 150h180'/><path d='M30 0v180M90 0v180M150 0v180'/></g></svg>");
  opacity: 0.45;
}

.hero-content {
  position: relative;
  display: grid;
  gap: var(--space-6);
  align-items: center;
}

@media (min-width: 900px) {
  .hero-content {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.hero-title {
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

.hero-text {
  font-size: 1.05rem;
  color: var(--charcoal-soft);
  max-width: 38rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.btn {
  border-radius: 999px;
  padding: 12px 22px;
  border: 1px solid var(--charcoal);
  background: transparent;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--forest);
  border-color: var(--forest);
  color: var(--white);
}

.btn:hover {
  transform: translateY(-1px);
  border-color: var(--forest-soft);
}

.hero-visual {
  background: var(--warm-gray-deep);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow);
}

.tabs {
  display: flex;
  gap: var(--space-2);
  border-bottom: 1px solid var(--line);
  margin-bottom: var(--space-5);
}

.tab-button {
  border: none;
  background: transparent;
  padding: var(--space-3) var(--space-4);
  font-size: 1rem;
  color: var(--charcoal-soft);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.tab-button[aria-selected="true"] {
  color: var(--forest);
  border-color: var(--forest);
}

.tab-panel {
  display: none;
  animation: fadeSlide 0.4s ease;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeSlide {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.project-grid,
.service-grid {
  display: grid;
  gap: var(--space-4);
}

@media (min-width: 720px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 980px) {
  .service-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.icon {
  width: 28px;
  height: 28px;
  color: var(--forest);
}

.card-title {
  margin: 0 0 var(--space-2);
  font-size: 1.05rem;
}

.card-subtitle {
  color: var(--charcoal-soft);
  font-size: 0.95rem;
}

.card-toggle {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.85rem;
}

.card-body {
  margin-top: var(--space-3);
  display: none;
}

.card-body.open {
  display: block;
}

.service-grid .card {
  min-height: 150px;
}

.service-grid .card-title {
  font-size: 0.98rem;
}

.about-list {
  display: grid;
  gap: var(--space-3);
}

.info-block {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
}

.contact-grid {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 860px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.form-field {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

input,
textarea {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 1rem;
  font-family: var(--font-sans);
  background: var(--white);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

.form-note {
  font-size: 0.9rem;
  color: var(--charcoal-soft);
}

.status {
  margin-top: var(--space-2);
  font-size: 0.95rem;
}

.footer {
  border-top: 1px solid var(--line);
  padding: var(--space-5) 0;
  background: var(--warm-gray-deep);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (min-width: 700px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.to-top {
  color: var(--forest);
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }

  .tab-panel {
    animation: none;
  }

  .btn:hover {
    transform: none;
  }
}