:root {
  --bg:        #0d1117;
  --surface:   #161b22;
  --surface2:  #1f2937;
  --border:    #30363d;
  --primary:   #f97316;
  --primary-h: #ea6c0a;
  --accent:    #fbbf24;
  --text:      #e6edf3;
  --muted:     #8b949e;
  --danger:    #ef4444;
  --success:   #22c55e;
  --radius:    10px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-h); }

/* Nav */
.nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}
.nav-logo span { color: var(--primary); }
.nav-links { display: flex; gap: 8px; align-items: center; }
.nav-links a {
  color: var(--muted);
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 14px;
  transition: color 0.15s, background 0.15s;
}
.nav-links a:hover { color: var(--text); background: var(--surface2); }
.nav-links a.active { color: var(--text); }

/* Page container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 24px;
}
.container-sm {
  max-width: 480px;
  margin: 0 auto;
  padding: 48px 24px;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card + .card { margin-top: 16px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s, background 0.15s;
  text-decoration: none;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary  { background: var(--primary); color: #fff; }
.btn-primary:hover  { background: var(--primary-h); color: #fff; }
.btn-ghost    { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-ghost:hover    { color: var(--text); border-color: var(--muted); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }

/* Forms */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 10px 14px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
  font-family: inherit;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 80px; }
.form-group select option { background: var(--surface2); }

/* Error / success messages */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  margin-bottom: 18px;
}
.alert-error   { background: rgba(239,68,68,.12); border: 1px solid rgba(239,68,68,.3); color: #fca5a5; }
.alert-success { background: rgba(34,197,94,.12); border: 1px solid rgba(34,197,94,.3); color: #86efac; }

/* Page heading */
.page-title {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -0.5px;
}
.page-sub {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
}

/* Pet grid */
.pet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.pet-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.pet-card:hover { border-color: var(--primary); transform: translateY(-2px); color: inherit; }
.pet-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--surface2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 12px;
  border: 2px solid var(--border);
  overflow: hidden;
}
.pet-avatar img { width: 100%; height: 100%; object-fit: cover; }
.pet-name { font-weight: 700; font-size: 16px; margin-bottom: 2px; }
.pet-species { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.pet-stat { font-size: 13px; color: var(--muted); }
.pet-stat strong { color: var(--text); }

/* Add pet card */
.pet-card-add {
  border: 1px dashed var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  gap: 8px;
  min-height: 160px;
  transition: border-color 0.15s, color 0.15s;
  border-radius: var(--radius);
  text-decoration: none;
}
.pet-card-add:hover { border-color: var(--primary); color: var(--primary); }
.pet-card-add .icon { font-size: 28px; }
.pet-card-add span { font-size: 14px; font-weight: 600; }

/* Photo upload preview */
.photo-upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s;
}
.photo-upload-area:hover { border-color: var(--primary); }
.photo-upload-area img { max-height: 160px; border-radius: 8px; object-fit: cover; }
.photo-upload-area p { color: var(--muted); font-size: 13px; margin-top: 8px; }
#photo-input { display: none; }

/* Divider */
.divider { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* Leaderboard table */
.lb-table { width: 100%; border-collapse: collapse; }
.lb-table th {
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}
.lb-table th:not(:first-child) { text-align: right; }
.lb-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.lb-table td:not(:first-child) { text-align: right; color: var(--muted); }
.lb-table tr:last-child td { border-bottom: none; }
.lb-table tr:hover td { background: var(--surface2); }
.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 800;
  background: var(--surface2);
  color: var(--muted);
  margin-right: 10px;
}
.rank-1 { background: rgba(251,191,36,.2); color: var(--accent); }
.rank-2 { background: rgba(148,163,184,.15); color: #94a3b8; }
.rank-3 { background: rgba(180,120,60,.2); color: #cd7f32; }

/* Empty state */
.empty {
  text-align: center;
  padding: 60px 24px;
  color: var(--muted);
}
.empty .icon { font-size: 48px; margin-bottom: 12px; }
.empty h3 { font-size: 18px; color: var(--text); margin-bottom: 6px; }
.empty p { font-size: 14px; }

/* Auth pages */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.auth-logo {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 32px;
  letter-spacing: -0.5px;
}
.auth-logo span { color: var(--primary); }
.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.auth-card h2 { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.auth-card p  { color: var(--muted); font-size: 14px; margin-bottom: 24px; }
.auth-footer { margin-top: 20px; text-align: center; font-size: 14px; color: var(--muted); }

/* Filters row */
.filters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.filter-btn {
  padding: 6px 14px;
  border-radius: 99px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}
.filter-btn:hover,
.filter-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Search */
.search-bar {
  position: relative;
  margin-bottom: 20px;
}
.search-bar input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 10px 14px 10px 40px;
  font-size: 14px;
  outline: none;
}
.search-bar input:focus { border-color: var(--primary); }
.search-bar .icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}

/* Responsive */
@media (max-width: 600px) {
  .nav { padding: 0 16px; }
  .container { padding: 24px 16px; }
  .pet-grid { grid-template-columns: 1fr 1fr; }
}