@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/static/pretendard.min.css');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;600;700;800&display=swap');

:root {
  --blue: #0066FF;
  --blue-dark: #0052CC;
  --red: #EF4444;
  --green: #10B981;
  --yellow: #F59E0B;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-900: #111827;
  --mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--gray-100);
  color: var(--gray-900);
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }

/* Header */
.header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 56px;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--gray-900);
}
.logo-suffix { font-size: 0.6rem; color: var(--gray-400); margin-top: 2px; }
.nav { display: flex; gap: 4px; }
.nav a {
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gray-600);
  transition: all 0.15s;
}
.nav a:hover { background: var(--gray-100); color: var(--gray-900); }

/* Main */
.main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px;
}

/* Breadcrumb */
.breadcrumb { display: flex; align-items: center; gap: 6px; margin-bottom: 6px; }
.breadcrumb a, .breadcrumb span { font-size: 0.7rem; }
.breadcrumb a { color: var(--gray-400); }
.breadcrumb .sep { color: var(--gray-300); }
.breadcrumb .current { color: var(--gray-500); }

.page-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.page-desc {
  font-size: 0.82rem;
  color: var(--gray-500);
  margin-bottom: 24px;
}

/* Card */
.card {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  border: 1px solid var(--gray-200);
  margin-bottom: 16px;
}

/* Form */
.input-row { margin-bottom: 16px; }
.input-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}
.input-hint { font-size: 0.68rem; color: var(--gray-400); margin-top: 4px; }

.input-wrap { display: flex; align-items: center; }
.input-field {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--mono);
  outline: none;
  color: var(--gray-900);
  background: #fff;
  transition: border 0.15s;
}
.input-field:focus { border-color: var(--blue); }
.input-field.has-suffix { border-radius: 10px 0 0 10px; }
.input-suffix {
  padding: 10px 14px;
  background: var(--gray-100);
  border: 1px solid var(--gray-300);
  border-left: none;
  border-radius: 0 10px 10px 0;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray-500);
  white-space: nowrap;
}

.date-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 10px;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  color: var(--gray-900);
}

.select-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 10px;
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
  color: var(--gray-900);
  background: #fff;
}

/* Toggle Buttons */
.toggle-group { display: flex; gap: 6px; }
.toggle-btn {
  flex: 1;
  padding: 10px 0;
  border-radius: 10px;
  border: 1px solid var(--gray-300);
  background: #fff;
  color: var(--gray-500);
  font-weight: 600;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}
.toggle-btn.active {
  border: 2px solid var(--blue);
  background: #EFF6FF;
  color: var(--blue);
}

/* Primary Button */
.btn-primary {
  width: 100%;
  padding: 12px 0;
  border-radius: 12px;
  border: none;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}
.btn-primary:hover { opacity: 0.9; }
.btn-primary:disabled { background: var(--gray-300); cursor: default; }

/* Result Box */
.result-box {
  padding: 16px;
  border-radius: 12px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  text-align: center;
}
.result-box.highlight {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  border: none;
}
.result-label { font-size: 0.68rem; font-weight: 500; color: var(--gray-400); margin-bottom: 4px; }
.result-box.highlight .result-label { color: rgba(255,255,255,0.7); }
.result-value {
  font-size: 1.3rem;
  font-weight: 800;
  font-family: var(--mono);
  color: var(--gray-900);
  letter-spacing: -0.02em;
}
.result-box.highlight .result-value { color: #fff; }
.result-sub { font-size: 0.65rem; color: var(--gray-400); margin-top: 2px; }
.result-box.highlight .result-sub { color: rgba(255,255,255,0.5); }

.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 12px; }
.result-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }

/* Detail Row */
.detail-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--gray-100);
}
.detail-label { font-size: 0.78rem; color: var(--gray-500); }
.detail-value { font-size: 0.78rem; font-weight: 600; font-family: var(--mono); color: var(--gray-900); }
.detail-value.negative { color: var(--red); }

/* Info Box */
.info-box {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 0.75rem;
  font-weight: 600;
}
.info-box.green { background: rgba(16,185,129,0.08); border: 1px solid rgba(16,185,129,0.2); color: var(--green); }
.info-box.red { background: rgba(239,68,68,0.08); border: 1px solid rgba(239,68,68,0.2); color: var(--red); }
.info-box.blue { background: rgba(0,102,255,0.06); border: 1px solid rgba(0,102,255,0.15); color: var(--blue); }

/* SEO Content */
.seo-title { font-size: 0.85rem; font-weight: 700; color: var(--gray-700); margin-bottom: 10px; }
.seo-text { font-size: 0.75rem; color: var(--gray-500); line-height: 1.8; }

/* Footer */
.footer {
  background: var(--gray-50);
  border-top: 1px solid var(--gray-200);
  padding: 32px 20px;
  margin-top: 40px;
  text-align: center;
}
.footer-text { font-size: 0.72rem; color: var(--gray-400); line-height: 2; }

/* ─── HOME PAGE ─── */
.hero {
  background: linear-gradient(135deg, #0066FF 0%, #0052CC 50%, #003D99 100%);
  border-radius: 20px;
  padding: 40px 28px;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 200px; height: 200px;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
}
.hero-title { font-size: 1.6rem; font-weight: 900; color: #fff; margin-bottom: 6px; letter-spacing: -0.03em; position: relative; }
.hero-desc { font-size: 0.82rem; color: rgba(255,255,255,0.65); margin-bottom: 20px; position: relative; }
.hero-search {
  position: relative;
  width: 100%;
  padding: 12px 16px 12px 40px;
  border-radius: 12px;
  border: 2px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.12);
  font-size: 0.9rem;
  font-weight: 500;
  color: #fff;
  outline: none;
  font-family: inherit;
}
.hero-search::placeholder { color: rgba(255,255,255,0.4); }
.hero-search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); font-size: 1rem; opacity: 0.5; }

.section-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--gray-700);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.hot-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.hot-card {
  background: #fff;
  border-radius: 14px;
  padding: 18px 16px;
  border: 1px solid var(--gray-200);
  transition: all 0.15s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.hot-card:hover { border-color: var(--blue); box-shadow: 0 4px 12px rgba(0,102,255,0.1); }
.hot-icon { font-size: 1.5rem; margin-bottom: 8px; }
.hot-name { font-weight: 700; font-size: 0.85rem; color: var(--gray-900); margin-bottom: 4px; }
.hot-desc { font-size: 0.68rem; color: var(--gray-400); line-height: 1.4; }

.list-card {
  background: #fff;
  border-radius: 14px;
  border: 1px solid var(--gray-200);
  overflow: hidden;
  margin-bottom: 28px;
}
.list-item {
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--gray-100);
  transition: background 0.1s;
}
.list-item:last-child { border-bottom: none; }
.list-item:hover { background: var(--gray-50); }
.list-icon { font-size: 1.2rem; flex-shrink: 0; }
.list-info { flex: 1; }
.list-name { font-weight: 600; font-size: 0.82rem; color: var(--gray-900); }
.list-desc { font-size: 0.68rem; color: var(--gray-400); }
.list-arrow { color: var(--gray-300); font-size: 0.8rem; }

/* BMI Bar */
.bmi-bar { position: relative; height: 8px; background: var(--gray-100); border-radius: 4px; margin-bottom: 8px; }
.bmi-segment { position: absolute; height: 100%; }
.bmi-pointer {
  position: absolute;
  top: -4px;
  width: 16px; height: 16px;
  background: var(--gray-900);
  border-radius: 50%;
  transform: translateX(-50%);
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.bmi-labels { display: flex; justify-content: space-between; font-size: 0.6rem; color: var(--gray-400); margin-bottom: 16px; }

/* Tire compatibility badge */
.compat-badge {
  text-align: center;
  padding: 16px;
  border-radius: 12px;
  margin-bottom: 16px;
}
.compat-badge.ok { background: rgba(16,185,129,0.08); border: 1px solid rgba(16,185,129,0.2); }
.compat-badge.warn { background: rgba(239,68,68,0.08); border: 1px solid rgba(239,68,68,0.2); }

.tire-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 16px; }
.tire-col-title { font-size: 0.68rem; font-weight: 600; margin-bottom: 8px; text-align: center; }
.tire-detail-box { border-radius: 10px; padding: 12px; }
.tire-detail-box.current { background: var(--gray-50); border: 1px solid var(--gray-200); }
.tire-detail-box.changed { background: #FFFBEB; border: 1px solid #FDE68A; }

.cta-banner {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  text-align: center;
  color: #fff;
}
.cta-title { font-size: 0.78rem; font-weight: 700; margin-bottom: 4px; }
.cta-desc { font-size: 0.68rem; opacity: 0.6; }

/* Responsive */
@media (max-width: 480px) {
  .hot-grid { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .tire-compare { grid-template-columns: 1fr; }
  .nav a { padding: 6px 8px; font-size: 0.7rem; }
}

/* Category Tabs */
.cat-tab{padding:7px 14px;border-radius:20px;border:1px solid var(--gray-200);background:#fff;color:var(--gray-500);font-size:0.72rem;font-weight:600;cursor:pointer;font-family:inherit;white-space:nowrap;transition:all 0.15s}
.cat-tab.active{border-color:var(--blue);background:var(--blue);color:#fff}
.cat-tab:hover:not(.active){border-color:var(--blue);color:var(--blue)}
.hot-link .hot-card{padding:14px 12px}
.hot-link .hot-name{font-size:0.8rem}
.hot-link .hot-desc{font-size:0.62rem}