:root {
  /*
  Design DNA (fixed)
  Style Preset: Simple Minimal Software Studio
  Color Strategy: Soft White Base + Graphite Text + Single Accent (Sky Blue)
  Layout Pattern: Calm One-Column + Precision Dividers
  Section Order: Header -> Hero -> Solutions -> Services -> About -> Contact/Location -> Business Info -> Footer
  Icon Style: Minimal Mono Line Icon (SVG, single-stroke, consistent)
  Background Pattern: Subtle Grid Mist (SVG, ultra low contrast)
  */
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #2c2f33;
  --muted: #5a6168;
  --line: #d7dde5;
  --line-soft: #e9edf2;
  --accent: #7bb7ff;
  --accent-ink: #0f4a8a;
  --radius: 14px;
  --shadow: 0 2px 12px rgba(44, 47, 51, 0.06);
  --container: 1080px;
  --space-1: 6px;
  --space-2: 12px;
  --space-3: 18px;
  --space-4: 28px;
  --space-5: 40px;
  --space-6: 64px;
  --space-7: 88px;
  --transition: 180ms ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

img {
  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(--accent);
  outline-offset: 3px;
}

.container {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
}

.divider {
  border-bottom: 1px solid var(--line);
}

.header {
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.95rem;
}

.nav a {
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.nav a:hover {
  border-color: var(--line);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: transparent;
  padding: 8px 10px;
  border-radius: 10px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 4px 0;
}

.hero {
  padding: var(--space-7) 0 var(--space-6);
  background: var(--surface);
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  align-items: center;
}

.hero h1 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  margin: 0 0 var(--space-3);
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0 0 var(--space-4);
  color: var(--muted);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid var(--line);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
  background: transparent;
  font-weight: 600;
}

.button.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
}

.button:hover {
  transform: translateY(-1px);
}

.section {
  padding: var(--space-6) 0;
  background: var(--surface);
}

.section-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: var(--space-2);
}

.section h2 {
  margin: 0 0 var(--space-4);
  font-size: clamp(1.6rem, 2.6vw, 2.2rem);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: var(--space-4);
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
  background: #fbfcfd;
  transition: border-color var(--transition), transform var(--transition);
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: 0;
  margin-bottom: var(--space-2);
}

.card ul {
  padding-left: 18px;
  margin: var(--space-2) 0 0;
  color: var(--muted);
}

.solution-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: transparent;
  border: none;
  padding: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.solution-details {
  margin-top: var(--space-2);
  color: var(--muted);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition), opacity var(--transition);
  opacity: 0;
}

.solution-details.open {
  max-height: 140px;
  opacity: 1;
}

.icon {
  width: 28px;
  height: 28px;
  stroke: var(--text);
  stroke-width: 1.6;
  fill: none;
}

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

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-5);
}

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

.form input,
.form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  background: #fbfcfd;
}

.form textarea {
  min-height: 140px;
  resize: vertical;
}

.form .button {
  width: fit-content;
}

.notice {
  font-size: 0.9rem;
  color: var(--muted);
}

.info-list {
  display: grid;
  gap: var(--space-2);
  color: var(--muted);
}

.footer {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: var(--space-4) 0 var(--space-5);
  font-size: 0.9rem;
  color: var(--muted);
}

.footer a {
  color: var(--accent-ink);
}

@media (max-width: 820px) {
  .nav {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: var(--space-3);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    width: min(240px, 90vw);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity var(--transition), transform var(--transition);
  }

  .nav.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-toggle {
    display: inline-flex;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}