/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --accent: #3b82f6;
  --dark: #0f172a;
  --gray-900: #111827;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --gray-100: #f3f4f6;
  --gray-50: #f9fafb;
  --white: #ffffff;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
  --container: 1140px;
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Pretendard", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--gray-900);
  background: var(--white);
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-100);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 1.25rem; color: var(--dark); }
.logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: var(--primary); color: #fff;
  border-radius: 10px; font-weight: 800; font-size: 1.1rem;
}
.main-nav { display: flex; gap: 8px; }
.nav-link {
  padding: 8px 16px; border-radius: 8px; font-weight: 500;
  color: var(--gray-700); transition: all 0.2s;
}
.nav-link:hover { background: var(--gray-100); color: var(--primary); }
.nav-toggle { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; }
.nav-toggle span { width: 24px; height: 2px; background: var(--gray-900); border-radius: 2px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: var(--radius); font-weight: 600;
  font-size: 1rem; cursor: pointer; border: 2px solid transparent;
  transition: all 0.2s; text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-outline { border-color: var(--gray-300); color: var(--gray-700); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ===== Hero ===== */
.hero {
  padding: 100px 0 80px;
  background: linear-gradient(135deg, var(--dark) 0%, #1e3a5f 100%);
  color: #fff; text-align: center;
}
.hero-title { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.2; margin-bottom: 20px; }
.hero-title .accent { background: linear-gradient(90deg, var(--accent), #60a5fa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-subtitle { font-size: clamp(1rem, 2vw, 1.25rem); color: var(--gray-300); max-width: 600px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero .btn-outline { border-color: rgba(255,255,255,0.3); color: #fff; }
.hero .btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); }

/* ===== Sections ===== */
.features { padding: 80px 0; }
.section-title { font-size: 2rem; font-weight: 800; text-align: center; margin-bottom: 12px; }
.section-desc { text-align: center; color: var(--gray-500); margin-bottom: 48px; font-size: 1.1rem; }
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px;
}
.feature-card {
  padding: 32px 24px; border-radius: var(--radius);
  background: var(--white); border: 1px solid var(--gray-100);
  box-shadow: var(--shadow); transition: all 0.3s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.feature-icon { font-size: 2.5rem; margin-bottom: 16px; }
.feature-card h3 { font-size: 1.25rem; margin-bottom: 8px; }
.feature-card p { color: var(--gray-500); }

/* ===== CTA ===== */
.cta {
  padding: 64px 0; background: var(--gray-50); text-align: center;
}
.cta h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.cta p { color: var(--gray-500); margin-bottom: 24px; font-size: 1.1rem; }

/* ===== Page Header ===== */
.page-header {
  padding: 64px 0 40px; background: var(--dark); color: #fff; text-align: center;
}
.page-header h1 { font-size: 2.5rem; font-weight: 800; margin-bottom: 8px; }
.page-header p { color: var(--gray-300); font-size: 1.1rem; }

/* ===== Content Sections ===== */
.content-section { padding: 64px 0; }
.content-section.bg-light { background: var(--gray-50); }
.content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.content-grid h2 { font-size: 1.75rem; margin-bottom: 16px; }
.content-grid p { color: var(--gray-700); margin-bottom: 16px; }

/* ===== Stats ===== */
.stat-card { display: flex; flex-direction: column; gap: 24px; background: var(--gray-50); padding: 32px; border-radius: var(--radius); }
.stat-item { text-align: center; }
.stat-num { font-size: 2.5rem; font-weight: 800; color: var(--primary); }
.stat-label { color: var(--gray-500); font-weight: 500; }

/* ===== Service Grid ===== */
.service-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.service-card { padding: 32px; border-radius: var(--radius); background: var(--white); border: 1px solid var(--gray-100); box-shadow: var(--shadow); }
.service-num { font-size: 1.5rem; font-weight: 800; color: var(--primary); opacity: 0.3; margin-bottom: 8px; }
.service-card h3 { font-size: 1.35rem; margin-bottom: 12px; }
.service-card p { color: var(--gray-500); margin-bottom: 16px; }
.service-card ul { display: flex; flex-direction: column; gap: 8px; }
.service-card ul li { color: var(--gray-700); padding-left: 24px; position: relative; }
.service-card ul li::before { content: "✓"; position: absolute; left: 0; color: var(--primary); font-weight: 700; }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; }
.contact-item { margin-bottom: 24px; }
.contact-label { display: block; font-weight: 600; color: var(--gray-700); margin-bottom: 4px; }
.contact-item p { color: var(--gray-500); font-size: 1.1rem; }
.contact-form-wrap { background: var(--gray-50); padding: 32px; border-radius: var(--radius); }
.contact-form-wrap h2 { margin-bottom: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--gray-700); }
.form-group input, .form-group textarea {
  width: 100%; padding: 12px 16px; border: 1px solid var(--gray-300);
  border-radius: 8px; font-size: 1rem; font-family: inherit; transition: border-color 0.2s;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); }

/* ===== Error Page ===== */
.error-page { padding: 120px 0; text-align: center; }
.error-code { font-size: 6rem; font-weight: 800; color: var(--primary); }
.error-msg { font-size: 1.5rem; color: var(--gray-500); margin-bottom: 32px; }

/* ===== Footer ===== */
.site-footer { background: var(--dark); color: var(--gray-300); padding: 48px 0; }
.footer-inner { text-align: center; }
.footer-brand { display: flex; align-items: center; justify-content: center; gap: 8px; font-weight: 800; font-size: 1.25rem; color: #fff; margin-bottom: 12px; }
.footer-desc { margin-bottom: 24px; }
.footer-links { display: flex; justify-content: center; gap: 24px; margin-bottom: 24px; }
.footer-links a { color: var(--gray-300); transition: color 0.2s; }
.footer-links a:hover { color: #fff; }
.footer-copy { font-size: 0.875rem; color: var(--gray-500); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .main-nav.active {
    display: flex; flex-direction: column; position: absolute;
    top: 72px; left: 0; right: 0; background: #fff;
    padding: 16px; border-bottom: 1px solid var(--gray-100); box-shadow: var(--shadow);
  }
  .content-grid, .contact-grid { grid-template-columns: 1fr; }
}