/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #1F2937;
  background: #F9FAFB;
  line-height: 1.7;
  min-height: 100vh;
}
a { color: #10B981; text-decoration: none; transition: color .2s; }
a:hover { color: #059669; }
img { max-width: 100%; display: block; }
button, input, select, textarea { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Our-Sites Bar ===== */
.our-sites-bar {
  background: #1F2937;
  padding: 6px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  overflow-x: auto;
  white-space: nowrap;
  font-size: .8rem;
}
.our-sites-bar::-webkit-scrollbar { height: 3px; }
.our-sites-bar::-webkit-scrollbar-thumb { background: #4B5563; border-radius: 3px; }
.our-sites-label {
  color: #9CA3AF;
  font-weight: 600;
  font-size: .75rem;
  flex-shrink: 0;
}
.our-sites-links { display: flex; gap: 6px; }
.our-sites-links a {
  color: #D1D5DB;
  padding: 3px 8px;
  border-radius: 4px;
  transition: background .2s, color .2s;
  font-size: .78rem;
}
.our-sites-links a:hover { background: #374151; color: #FFF; }
.our-sites-links a.active {
  background: #10B981;
  color: #FFF;
  font-weight: 600;
}

/* ===== Header ===== */
.header {
  background: #FFF;
  border-bottom: 1px solid #E5E7EB;
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: #10B981;
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo span { color: #6B7280; font-weight: 400; font-size: .9rem; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  padding: 6px 14px;
  border-radius: 8px;
  color: #4B5563;
  font-size: .88rem;
  font-weight: 500;
  transition: background .2s, color .2s;
}
.nav a:hover, .nav a.active { background: #D1FAE5; color: #059669; }
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #4B5563;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  color: #FFF;
  text-align: center;
  padding: 64px 20px 56px;
}
.hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.3;
}
.hero p {
  font-size: 1.15rem;
  opacity: .92;
  max-width: 620px;
  margin: 0 auto 28px;
}
.hero-badges { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-badge {
  background: rgba(255,255,255,.2);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: .88rem;
  backdrop-filter: blur(4px);
}

/* ===== Category Section ===== */
.tools-section { padding: 56px 0; }
.category-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.category-title .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.category-group { margin-bottom: 48px; }

/* ===== Tool Card ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 20px;
}
.tool-card {
  background: #FFF;
  border-radius: 14px;
  padding: 28px 24px;
  border: 1px solid #E5E7EB;
  transition: transform .25s, box-shadow .25s;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  position: relative;
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(16,185,129,.18);
  border-color: #10B981;
}
.tool-card .card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}
.tool-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #1F2937;
}
.tool-card p {
  font-size: .88rem;
  color: #6B7280;
  line-height: 1.6;
  flex: 1;
}
.free-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  background: #D1FAE5;
  color: #059669;
  font-size: .72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
}

/* ===== Features Strip ===== */
.features {
  background: #FFF;
  border-top: 1px solid #E5E7EB;
  padding: 48px 0;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  text-align: center;
}
.feature-item .icon { font-size: 2rem; margin-bottom: 10px; }
.feature-item h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.feature-item p { font-size: .88rem; color: #6B7280; }

/* ===== Footer ===== */
.footer {
  background: #111827;
  color: #9CA3AF;
  padding: 40px 0 24px;
  font-size: .85rem;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}
.footer-col h4 {
  color: #F9FAFB;
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.footer-col a {
  display: block;
  color: #9CA3AF;
  padding: 3px 0;
  font-size: .84rem;
  transition: color .2s;
}
.footer-col a:hover { color: #10B981; }
.footer-bottom {
  text-align: center;
  border-top: 1px solid #1F2937;
  padding-top: 20px;
  color: #6B7280;
  font-size: .82rem;
}

/* ===== Tool Page ===== */
.tool-page { padding: 32px 0 56px; }
.breadcrumb {
  font-size: .85rem;
  color: #6B7280;
  margin-bottom: 20px;
}
.breadcrumb a { color: #10B981; }
.breadcrumb span { margin: 0 6px; color: #D1D5DB; }
.tool-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}
.tool-header .tool-icon { font-size: 2.5rem; }
.tool-header h1 { font-size: 1.6rem; font-weight: 800; }
.tool-header p { color: #6B7280; font-size: .95rem; margin-top: 4px; }

/* ===== Panel ===== */
.panel {
  background: #FFF;
  border-radius: 16px;
  padding: 32px;
  border: 1px solid #E5E7EB;
  margin-bottom: 24px;
}
.panel h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: #1F2937;
}
.panel h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #374151;
}

/* ===== Calc Form ===== */
.calc-form { display: flex; flex-direction: column; gap: 18px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
  font-size: .9rem;
  font-weight: 600;
  color: #374151;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid #E5E7EB;
  border-radius: 8px;
  font-size: 1rem;
  color: #1F2937;
  background: #FFF;
  transition: border-color .2s;
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: #10B981;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-hint {
  font-size: .8rem;
  color: #9CA3AF;
  margin-top: 2px;
}
.radio-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.radio-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  cursor: pointer;
  padding: 8px 16px;
  border: 1.5px solid #E5E7EB;
  border-radius: 8px;
  transition: border-color .2s, background .2s;
}
.radio-group label:has(input:checked) {
  border-color: #10B981;
  background: #D1FAE5;
}
.radio-group input[type="radio"] { accent-color: #10B981; }
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .9rem;
  cursor: pointer;
}
.checkbox-label input[type="checkbox"] { accent-color: #10B981; width: 18px; height: 18px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: background .2s, transform .15s;
}
.btn:active { transform: scale(.97); }
.btn-primary {
  background: #10B981;
  color: #FFF;
}
.btn-primary:hover { background: #059669; }
.btn-secondary {
  background: #F3F4F6;
  color: #374151;
}
.btn-secondary:hover { background: #E5E7EB; }
.btn-sm {
  padding: 8px 16px;
  font-size: .88rem;
  border-radius: 8px;
}
.btn-danger {
  background: #FEE2E2;
  color: #DC2626;
}
.btn-danger:hover { background: #FECACA; }
.btn-full { width: 100%; }

/* ===== Result Box ===== */
.result-box {
  background: #D1FAE5;
  border-radius: 12px;
  padding: 24px;
  margin-top: 20px;
}
.result-box.hidden { display: none; }
.result-main {
  font-size: 2rem;
  font-weight: 700;
  color: #059669;
  margin-bottom: 8px;
  text-align: center;
}
.result-label {
  font-size: .85rem;
  color: #065F46;
  text-align: center;
  margin-bottom: 16px;
}
.result-rows { margin-top: 12px; }
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid rgba(16,185,129,.2);
  font-size: .92rem;
}
.result-row:last-child { border-bottom: none; }
.result-row .label { color: #065F46; }
.result-row .value { font-weight: 700; color: #059669; }

/* ===== Unit Grid ===== */
.unit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.unit-item {
  background: #FFF;
  border: 1.5px solid #E5E7EB;
  border-radius: 10px;
  padding: 14px;
  transition: border-color .2s;
}
.unit-item:focus-within { border-color: #10B981; }
.unit-item .unit-label {
  font-size: .78rem;
  color: #6B7280;
  font-weight: 600;
  margin-bottom: 6px;
}
.unit-item input {
  width: 100%;
  border: none;
  font-size: 1.1rem;
  font-weight: 600;
  color: #1F2937;
  background: transparent;
  outline: none;
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  background: #F3F4F6;
  border-radius: 10px;
  padding: 4px;
}
.tab-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: transparent;
  border-radius: 8px;
  font-size: .92rem;
  font-weight: 600;
  color: #6B7280;
  cursor: pointer;
  transition: background .2s, color .2s;
}
.tab-btn.active {
  background: #FFF;
  color: #10B981;
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== Table ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
  font-size: .88rem;
}
.data-table th, .data-table td {
  padding: 10px 12px;
  text-align: right;
  border-bottom: 1px solid #E5E7EB;
}
.data-table th {
  background: #F9FAFB;
  font-weight: 700;
  color: #374151;
  text-align: right;
}
.data-table th:first-child, .data-table td:first-child { text-align: center; }
.data-table tbody tr:hover { background: #F0FDF4; }

/* ===== BMI Scale ===== */
.bmi-scale {
  height: 24px;
  border-radius: 12px;
  background: linear-gradient(90deg, #3B82F6 0%, #10B981 25%, #F59E0B 55%, #EF4444 80%, #991B1B 100%);
  position: relative;
  margin: 20px 0 32px;
}
.bmi-marker {
  position: absolute;
  top: -8px;
  width: 4px;
  height: 40px;
  background: #1F2937;
  border-radius: 2px;
  transform: translateX(-50%);
  transition: left .4s;
}
.bmi-labels {
  display: flex;
  justify-content: space-between;
  font-size: .75rem;
  color: #6B7280;
  margin-top: 4px;
}

/* ===== D-Day List ===== */
.dday-list { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.dday-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #F9FAFB;
  border-radius: 10px;
  padding: 14px 18px;
  border: 1px solid #E5E7EB;
}
.dday-item .dday-name { font-weight: 600; }
.dday-item .dday-value { font-weight: 700; color: #059669; font-size: 1.1rem; }
.dday-item .dday-date { font-size: .82rem; color: #6B7280; }
.dday-item button {
  background: none;
  border: none;
  color: #9CA3AF;
  cursor: pointer;
  font-size: 1.1rem;
}
.dday-item button:hover { color: #EF4444; }

/* ===== Tips Panel ===== */
.tips-panel { background: #F0FDF4; border-radius: 12px; padding: 20px 24px; margin-top: 24px; }
.tips-panel h3 { color: #059669; margin-bottom: 10px; font-size: 1rem; }
.tips-panel ul { padding-left: 20px; }
.tips-panel li { font-size: .88rem; color: #374151; margin-bottom: 6px; line-height: 1.6; }

/* ===== Percentage Page ===== */
.calc-section {
  border: 1px solid #E5E7EB;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  background: #FFF;
}
.calc-section h3 { margin-bottom: 14px; }
.inline-form {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 1rem;
  font-weight: 500;
}
.inline-form input {
  width: 120px;
  padding: 10px 12px;
  border: 1.5px solid #E5E7EB;
  border-radius: 8px;
  font-size: 1rem;
  text-align: center;
}
.inline-form input:focus { outline: none; border-color: #10B981; }
.inline-result {
  font-size: 1.3rem;
  font-weight: 700;
  color: #059669;
  min-width: 80px;
  text-align: center;
}

/* ===== About Page ===== */
.about-hero {
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  color: #FFF;
  text-align: center;
  padding: 56px 20px;
}
.about-hero h1 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.about-hero p { font-size: 1.05rem; opacity: .92; }
.about-content { padding: 48px 0; }
.about-content h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 16px; color: #10B981; }
.about-content p, .about-content li { font-size: .95rem; line-height: 1.8; color: #374151; }
.about-content ul { padding-left: 20px; margin-bottom: 24px; }
.about-section { margin-bottom: 40px; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.7rem; }
  .hero p { font-size: 1rem; }
  .nav { display: none; }
  .nav.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: #FFF; padding: 12px 20px; border-bottom: 1px solid #E5E7EB; box-shadow: 0 4px 12px rgba(0,0,0,.08); }
  .mobile-menu-btn { display: block; }
  .tools-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .panel { padding: 20px; }
  .result-main { font-size: 1.5rem; }
  .tool-header h1 { font-size: 1.3rem; }
  .unit-grid { grid-template-columns: 1fr 1fr; }
  .data-table { font-size: .78rem; }
  .data-table th, .data-table td { padding: 8px 6px; }
  .inline-form input { width: 80px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .unit-grid { grid-template-columns: 1fr; }
  .hero { padding: 40px 16px 36px; }
  .hero h1 { font-size: 1.4rem; }
  .our-sites-bar { padding: 6px 12px; }
}