/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #1a3c5e;
  --accent:  #2d80b5;
  --light:   #f4f7fb;
  --white:   #ffffff;
  --text:    #333333;
  --muted:   #6b7a8d;
  --border:  #dde3eb;
  --radius:  8px;
  --shadow:  0 4px 20px rgba(0,0,0,0.08);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Noto Sans KR', 'Malgun Gothic', sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--white);
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== BUTTON ===== */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}
.btn-primary {
  background: var(--accent);
  color: var(--white);
}
.btn-primary:hover { background: #1f6a9a; transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid var(--white);
}
.btn-outline:hover { background: var(--white); color: var(--primary); }

/* ===== HEADER / NAV ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
}
.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--accent); border-bottom-color: var(--accent); }

.nav-cta { display: flex; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary);
  transition: all 0.3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.mobile-nav {
  display: none;
  position: absolute;
  top: 68px;
  left: 0; right: 0;
  background: var(--white);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  padding: 16px 24px 24px;
  flex-direction: column;
  gap: 16px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a { font-size: 1.05rem; font-weight: 500; color: var(--text); padding: 8px 0; border-bottom: 1px solid var(--border); }
.mobile-nav a:hover { color: var(--accent); }

/* ===== PAGE HERO ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, #2a5f8f 100%);
  color: var(--white);
  padding: 72px 0;
  text-align: center;
}
.page-hero h1 { font-size: 2.2rem; margin-bottom: 12px; }
.page-hero p { color: rgba(255,255,255,0.8); font-size: 1.05rem; }

/* ===== SECTION TITLES ===== */
.section-title {
  text-align: center;
  margin-bottom: 48px;
}
.section-title h2 {
  font-size: 1.9rem;
  color: var(--primary);
  margin-bottom: 12px;
}
.section-title p { color: var(--muted); font-size: 1rem; max-width: 520px; margin: 0 auto; }
.section-title .line {
  width: 48px; height: 3px;
  background: var(--accent);
  margin: 14px auto 0;
  border-radius: 2px;
}

/* ===== SECTIONS ===== */
section { padding: 80px 0; }
section:nth-child(even) { background: var(--light); }

/* ===== FOOTER ===== */
footer {
  background: var(--primary);
  color: rgba(255,255,255,0.75);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { color: var(--white); margin-bottom: 12px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; }
.footer-col h4 { color: var(--white); font-size: 0.95rem; margin-bottom: 14px; }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col ul a { font-size: 0.9rem; color: rgba(255,255,255,0.65); }
.footer-col ul a:hover { color: var(--white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
}

/* ===== CARD ===== */
.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(0,0,0,0.12); }

/* ===== FORM ===== */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 500; margin-bottom: 6px; font-size: 0.9rem; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  transition: border-color 0.2s;
  background: var(--white);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { outline: none; border-color: var(--accent); }
.form-group textarea { resize: vertical; min-height: 130px; }

/* ===== GRID UTILITIES ===== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }

  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }

  .page-hero h1 { font-size: 1.7rem; }
  section { padding: 56px 0; }
}