/* ════════════════════════════════════════════════
   WELAI — Welfare AI Assistant  |  welai.co.kr
   ════════════════════════════════════════════════ */

:root {
  --blue:    #2563EB;
  --purple:  #7C3AED;
  --cyan:    #06B6D4;
  --dark:    #1E293B;
  --gray:    #64748B;
  --light:   #F1F5F9;
  --white:   #FFFFFF;
  --border:  #E2E8F0;
  --shadow:  0 4px 24px rgba(37,99,235,.10);
  --radius:  14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.7;
}

/* ── 공통 ── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.section    { padding: 96px 0; }
.section-alt { background: var(--light); }

.tag {
  display: inline-block;
  background: rgba(37,99,235,.1);
  color: var(--blue);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

h2.section-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}

p.section-desc {
  color: var(--gray);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto 56px;
}

.text-center { text-align: center; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all .2s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  color: var(--white);
  box-shadow: 0 4px 16px rgba(37,99,235,.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,.45); }
.btn-outline {
  background: transparent;
  color: var(--blue);
  border: 2px solid var(--blue);
}
.btn-outline:hover { background: rgba(37,99,235,.06); }

/* ── 네비게이션 ── */
nav {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.nav-logo img { height: 36px; }
.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  color: var(--gray);
  text-decoration: none;
  font-size: .95rem;
  font-weight: 500;
  transition: color .2s;
}
.nav-links a:hover { color: var(--blue); }
.nav-cta { display: flex; gap: 12px; align-items: center; }

/* ── 히어로 ── */
.hero {
  padding: 100px 0 80px;
  background: linear-gradient(160deg, #EFF6FF 0%, #F5F3FF 100%);
  overflow: hidden;
  position: relative;
}
.hero::before {
  content: "";
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,.08), transparent 70%);
  top: -100px; right: -100px;
  border-radius: 50%;
}
.hero-content { max-width: 640px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(37,99,235,.1);
  color: var(--blue);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: -.03em;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero h1 span {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 1.15rem;
  color: var(--gray);
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.stat-num  { font-size: 1.8rem; font-weight: 900; color: var(--blue); }
.stat-label{ font-size: .85rem; color: var(--gray); margin-top: 2px; }

/* ── 특징 카드 ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: box-shadow .2s, transform .2s;
}
.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.feature-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}
.ic-blue   { background: rgba(37,99,235,.1); }
.ic-purple { background: rgba(124,58,237,.1); }
.ic-cyan   { background: rgba(6,182,212,.1); }
.ic-green  { background: rgba(16,185,129,.1); }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.feature-card p  { color: var(--gray); font-size: .95rem; }

/* ── 사용 방법 ── */
.steps { display: flex; flex-direction: column; gap: 0; max-width: 720px; margin: 0 auto; }
.step {
  display: flex;
  gap: 28px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.step:last-child { border-bottom: none; }
.step-num {
  width: 48px; height: 48px;
  min-width: 48px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  color: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 900;
  font-size: 1.1rem;
}
.step-content h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.step-content p  { color: var(--gray); font-size: .95rem; }
.step-content code {
  background: var(--light);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: .88rem;
  color: var(--blue);
}

/* ── 다운로드 ── */
.download-card {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border-radius: 20px;
  padding: 56px 48px;
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.download-card h2 { font-size: 1.8rem; font-weight: 800; margin-bottom: 12px; }
.download-card p  { opacity: .85; font-size: 1rem; max-width: 420px; }
.btn-white {
  background: white;
  color: var(--blue);
  font-weight: 800;
  padding: 16px 36px;
  border-radius: 10px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transition: all .2s;
  box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.2); }

/* ── 공지사항 ── */
.notice-list { display: flex; flex-direction: column; gap: 12px; max-width: 760px; margin: 0 auto; }
.notice-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: box-shadow .2s;
}
.notice-item:hover { box-shadow: var(--shadow); }
.notice-badge {
  font-size: .75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 6px;
  white-space: nowrap;
  margin-top: 2px;
}
.badge-new   { background: rgba(37,99,235,.1);  color: var(--blue); }
.badge-update{ background: rgba(16,185,129,.1); color: #10B981; }
.badge-notice{ background: var(--light); color: var(--gray); }
.notice-date { font-size: .83rem; color: var(--gray); margin-top: 4px; }

/* ── 문의 폼 ── */
.inquiry-wrap {
  max-width: 640px;
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px 44px;
  box-shadow: var(--shadow);
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: .9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--dark);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: .97rem;
  font-family: inherit;
  color: var(--dark);
  background: var(--white);
  transition: border-color .2s;
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ── 푸터 ── */
footer {
  background: var(--dark);
  color: rgba(255,255,255,.65);
  padding: 48px 0 32px;
  font-size: .9rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,.1);
  margin-bottom: 24px;
}
.footer-logo img { height: 28px; filter: brightness(0) invert(1); opacity: .8; }
.footer-logo p   { margin-top: 12px; font-size: .85rem; line-height: 1.7; }
.footer-links h4 { color: white; font-size: .9rem; margin-bottom: 14px; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a  { color: rgba(255,255,255,.55); text-decoration: none; transition: color .2s; }
.footer-links a:hover { color: white; }
.footer-bottom { text-align: center; font-size: .82rem; color: rgba(255,255,255,.35); }

/* ── 반응형 ── */
@media (max-width: 768px) {
  .hero h1       { font-size: 2.1rem; }
  .nav-links     { display: none; }
  .hero-stats    { gap: 24px; }
  .download-card { text-align: center; justify-content: center; }
  .form-row      { grid-template-columns: 1fr; }
  .inquiry-wrap  { padding: 32px 24px; }
  h2.section-title { font-size: 1.6rem; }
}