/* ============================================
   K-Trust · 부동산 상속·증여 설계 진단
   Design tokens & base styles
   ============================================ */

:root {
  --navy: #1a3a52;
  --navy-deep: #0f2637;
  --navy-soft: #2a4a63;
  --gold: #d4af37;
  --gold-soft: #b8952d;
  --gold-light: #e8cc7a;

  --ink: #14202b;
  --ink-2: #3a4a58;
  --ink-3: #6b7885;
  --ink-4: #9aa4ae;

  --paper: #fbfaf7;
  --paper-2: #f5f2ec;
  --paper-3: #ebe6dc;
  --line: #e3ddd0;
  --line-soft: #efeae0;

  --serif: 'Noto Serif KR', 'Nanum Myeongjo', serif;
  --sans: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Malgun Gothic', sans-serif;
  --mono: 'JetBrains Mono', 'D2Coding', ui-monospace, monospace;

  --shadow-sm: 0 1px 2px rgba(20, 32, 43, 0.04), 0 1px 3px rgba(20, 32, 43, 0.03);
  --shadow-md: 0 4px 12px rgba(20, 32, 43, 0.06), 0 2px 4px rgba(20, 32, 43, 0.04);
  --shadow-lg: 0 24px 48px -12px rgba(20, 32, 43, 0.14), 0 8px 16px -8px rgba(20, 32, 43, 0.08);
  --shadow-xl: 0 40px 80px -20px rgba(15, 38, 55, 0.24);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'kern', 'liga';
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.serif { font-family: var(--serif); font-weight: 500; letter-spacing: -0.01em; }
.mono { font-family: var(--mono); }

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 40px;
}

/* Eyebrow label */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold-soft);
  font-weight: 700;
}
.eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--gold);
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 900ms cubic-bezier(0.2, 0.7, 0.2, 1), transform 900ms cubic-bezier(0.2, 0.7, 0.2, 1);
}
.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }

/* Gold divider */
.gold-rule {
  display: block;
  width: 48px;
  height: 1px;
  background: var(--gold);
  margin: 24px 0;
}
.gold-rule.center { margin: 24px auto; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  border-radius: 2px;
  transition: all 220ms ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--navy);
  color: var(--paper);
  box-shadow: 0 1px 0 var(--navy-deep) inset;
}
.btn-primary:hover {
  background: var(--navy-deep);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px -6px rgba(15, 38, 55, 0.35);
}
.btn-primary .arrow { transition: transform 220ms ease; }
.btn-primary:hover .arrow { transform: translateX(3px); }

.btn-ghost {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--line);
  padding: 15px 27px;
}
.btn-ghost:hover {
  border-color: var(--navy);
  background: var(--paper-2);
}

.btn-gold {
  background: transparent;
  color: var(--gold-soft);
  border: 1px solid var(--gold);
  padding: 15px 27px;
}
.btn-gold:hover {
  background: var(--gold);
  color: white;
}

/* Section base */
section {
  padding: 120px 0;
  position: relative;
}
section.dark {
  background: var(--navy-deep);
  color: var(--paper);
}
section.paper-2 {
  background: var(--paper-2);
}

.section-head {
  max-width: 720px;
  margin-bottom: 72px;
}
.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.section-title {
  font-family: var(--serif);
  font-size: 42px;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 16px 0 20px;
  color: var(--navy);
}
section.dark .section-title { color: var(--paper); }

.section-desc {
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink);
  font-weight: 450;
}
section.dark .section-desc { color: #dfe5eb; font-weight: 400; }

/* Placeholder pattern */
.ph {
  position: relative;
  background:
    repeating-linear-gradient(
      135deg,
      transparent 0,
      transparent 12px,
      rgba(26, 58, 82, 0.05) 12px,
      rgba(26, 58, 82, 0.05) 13px
    ),
    var(--paper-2);
  border: 1px solid var(--line);
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 16px;
}
.ph-label {
  background: var(--paper);
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
}

/* Utility */
.grid { display: grid; }
.flex { display: flex; }
.center { align-items: center; justify-content: center; }

/* Responsive */
@media (max-width: 900px) {
  .container { padding: 0 24px; }
  section { padding: 80px 0; }
  .section-title { font-size: 30px; }
  .section-head { margin-bottom: 48px; }
}