:root {
  --sf-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  --primary-text: #1d1d1f;
  --secondary-text: #515154;
  --bg-color: #f5f5f7;
  --card-bg: rgba(255, 255, 255, 0.8);
  --accent: #0066cc;
  --accent-hover: #004d99;
  --success: #198754;
  --warning: #f1c40f;
  --shadow: 0 8px 30px rgba(0,0,0,0.04);
  --glass: blur(20px) saturate(180%);
}

* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--sf-font);
  background: var(--bg-color);
  color: var(--primary-text);
  line-height: 1.47059;
  letter-spacing: -0.022em;
}

header {
  padding: 80px 20px;
  text-align: center;
  background: white;
}

header h1 {
  font-size: 56px;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin-bottom: 10px;
}

header p {
  font-size: 24px;
  color: var(--secondary-text);
  font-weight: 400;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* Controls / Filters */
.controls {
  background: var(--card-bg);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  padding: 24px;
  border-radius: 18px;
  box-shadow: var(--shadow);
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 60px;
  position: sticky;
  top: 20px;
  z-index: 100;
  border: 1px solid rgba(255,255,255,0.3);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.filter-group label {
  font-size: 12px;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--secondary-text);
  letter-spacing: 0.05em;
}

select {
  appearance: none;
  background: #fdfdfd;
  border: 1px solid #d2d2d7;
  border-radius: 8px;
  padding: 10px 35px 10px 15px;
  font-size: 16px;
  font-family: var(--sf-font);
  cursor: pointer;
  transition: all 0.2s ease;
  background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2386868b%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
  background-repeat: no-repeat;
  background-position: right 12px top 50%;
  background-size: 10px auto;
}

select:hover { border-color: var(--secondary-text); }
select:focus { outline: none; border-color: var(--accent); ring: 2px solid rgba(0,102,204,0.2); }

#resetBtn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 20px;
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}
#resetBtn:hover { background: var(--accent-hover); }

/* Bike Grid */
.bike-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 30px;
  margin-bottom: 80px;
}

.bike-card {
  background: white;
  border-radius: 22px;
  padding: 30px;
  box-shadow: var(--shadow);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.bike-card:hover { 
  transform: scale(1.02);
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}

.brand-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}

.bike-card h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 4px;
}

.category-tag {
  font-size: 14px;
  color: var(--secondary-text);
  margin-bottom: 24px;
}

.spec-list {
  list-style: none;
  border-top: 1px solid #f2f2f2;
  padding-top: 20px;
  flex-grow: 1;
}

.spec-list li {
  font-size: 14px;
  margin-bottom: 12px;
  color: #424245;
  display: flex;
  justify-content: space-between;
}

.spec-list b { color: var(--secondary-text); font-weight: 400; }

.price {
  font-size: 24px;
  font-weight: 600;
  margin-top: 24px;
  color: var(--primary-text);
}

/* Comparison Area */
.comparison-area {
  margin-bottom: 100px;
}

.comparison-area h2 {
  font-size: 40px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 40px;
}

.comparison-table-wrapper {
  background: white;
  border-radius: 22px;
  padding: 20px;
  box-shadow: var(--shadow);
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 800px;
}

.comparison-table th, .comparison-table td {
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid #f2f2f2;
}

.comparison-table th {
  font-weight: 600;
  color: var(--primary-text);
  font-size: 18px;
}

.comparison-table td {
  font-size: 15px;
  color: #424245;
}

.comparison-table tr:last-child td { border: none; }

/* Regulations Area */
.regulations-area, .tech-guide-area {
  padding: 80px 0;
  border-top: 1px solid #d2d2d7;
}

.regulations-area h2, .tech-guide-area h2 {
  font-size: 40px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 50px;
}

.reg-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.reg-card {
  background: white;
  padding: 40px;
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.reg-card h3 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.reg-card h3::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 24px;
  background: var(--accent);
  border-radius: 2px;
}

.reg-card ul { list-style: none; }

.reg-card li {
  font-size: 17px;
  padding: 16px 0;
  border-bottom: 1px solid #f2f2f2;
  color: #424245;
}

.reg-card li:last-child { border: none; }

.reg-card strong { color: var(--primary-text); font-weight: 600; }

.reg-notice {
  margin-top: 60px;
  background: #fff;
  border: 1px solid #d2d2d7;
  padding: 30px;
  border-radius: 18px;
  text-align: center;
  font-size: 17px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

@media (max-width: 768px) {
  header h1 { font-size: 40px; }
  header p { font-size: 19px; }
  .reg-grid { grid-template-columns: 1fr; }
  .controls { flex-direction: column; gap: 16px; }
}