/* ═══════════════════════════════════════════════════════════
   星空科技 · 自行车工具高级UI框架 v2.0
   设计参考: Silca / intervals.icu / SRAM AXS
   ═══════════════════════════════════════════════════════════ */

:root {
  --bg-deep: #060d18;
  --bg-card: rgba(12, 24, 48, 0.7);
  --bg-card-hover: rgba(16, 32, 60, 0.85);
  --border-subtle: rgba(79, 209, 255, 0.08);
  --border-active: rgba(79, 209, 255, 0.25);
  --border-glow: rgba(79, 209, 255, 0.4);
  --primary: #4fd1ff;
  --primary-dim: #2b8fb8;
  --accent: #ff9800;
  --accent-warm: #ffb347;
  --success: #4caf50;
  --danger: #ef5350;
  --text-primary: #e8edf5;
  --text-secondary: #a0b8d0;
  --text-muted: #5a78a0;
  --gradient-brand: linear-gradient(135deg, #4fd1ff, #a78bfa);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3), 0 0 40px rgba(79, 209, 255, 0.03);
  --shadow-glow: 0 0 30px rgba(79, 209, 255, 0.1);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --transition-fast: 0.15s ease;
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Premium Card ── */
.premium-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}
.premium-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: radial-gradient(ellipse at top left, rgba(79, 209, 255, 0.03), transparent 60%);
  pointer-events: none;
}
.premium-card:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

/* ── Premium Gauge Ring ── */
.gauge-ring {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.gauge-ring svg { display: block; }
.gauge-ring .gauge-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.04);
}
.gauge-ring .gauge-fill {
  fill: none;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.gauge-ring .gauge-value {
  position: absolute;
  text-align: center;
}
.gauge-ring .gv-number {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1;
}
.gauge-ring .gv-unit {
  font-size: 14px;
  font-weight: 600;
  opacity: 0.7;
  margin-top: 2px;
}
.gauge-ring .gv-label {
  font-size: 11px;
  font-weight: 500;
  opacity: 0.5;
  margin-top: 4px;
}

/* ── Premium Slider ── */
.premium-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(79, 209, 255, 0.1);
  outline: none;
  cursor: pointer;
}
.premium-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--primary);
  box-shadow: 0 0 16px rgba(79, 209, 255, 0.4);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.premium-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 0 24px rgba(79, 209, 255, 0.6);
}

/* ── Premium Select ── */
.premium-select {
  width: 100%;
  padding: 12px 16px;
  background: rgba(10, 20, 40, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%234fd1ff' fill='none' stroke-width='2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}
.premium-select:focus {
  border-color: var(--border-glow);
  box-shadow: 0 0 16px rgba(79, 209, 255, 0.1);
  outline: none;
}

/* ── Premium Input ── */
.premium-input {
  width: 100%;
  padding: 12px 16px;
  background: rgba(10, 20, 40, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  transition: all var(--transition-fast);
}
.premium-input:focus {
  border-color: var(--border-glow);
  box-shadow: 0 0 16px rgba(79, 209, 255, 0.1);
  outline: none;
}

/* ── Premium Button ── */
.premium-btn {
  padding: 12px 28px;
  border-radius: 25px;
  font-weight: 700;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  letter-spacing: 0.3px;
}
.premium-btn-primary {
  background: linear-gradient(135deg, var(--primary), #2b8fb8);
  color: #000;
  box-shadow: 0 4px 16px rgba(79, 209, 255, 0.25);
}
.premium-btn-primary:hover {
  box-shadow: 0 6px 24px rgba(79, 209, 255, 0.4);
  transform: translateY(-1px);
}
.premium-btn-outline {
  background: transparent;
  border: 1px solid var(--border-active);
  color: var(--primary);
}
.premium-btn-outline:hover {
  background: rgba(79, 209, 255, 0.08);
}

/* ── Premium Chip ── */
.premium-chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-subtle);
  background: rgba(10, 20, 40, 0.5);
  color: var(--text-secondary);
  white-space: nowrap;
}
.premium-chip:hover {
  border-color: var(--border-active);
  color: var(--primary);
}
.premium-chip.active {
  background: rgba(79, 209, 255, 0.12);
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 12px rgba(79, 209, 255, 0.1);
}

/* ── Premium Grid ── */
.premium-grid { display: grid; gap: 16px; }
.premium-grid-2 { grid-template-columns: repeat(2, 1fr); }
.premium-grid-3 { grid-template-columns: repeat(3, 1fr); }
.premium-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 768px) {
  .premium-grid-2, .premium-grid-3, .premium-grid-4 { grid-template-columns: 1fr; }
}

/* ── Premium Stat ── */
.premium-stat {
  text-align: center;
  padding: 20px 16px;
  background: rgba(10, 20, 40, 0.4);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}
.premium-stat .ps-value {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.premium-stat .ps-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ── Premium Field ── */
.premium-field { margin-bottom: 16px; }
.premium-field label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.premium-field label .pf-val {
  color: var(--primary);
  font-weight: 700;
  font-size: 14px;
}

/* ── Premium Value Display ── */
.premium-value {
  font-variant-numeric: tabular-nums;
  transition: all var(--transition-smooth);
}

/* ── Color Zones (for gauges) ── */
.zone-low { color: #ff9800; }
.zone-optimal { color: #4caf50; }
.zone-high { color: #ef5350; }

/* ── Animated Counter ── */
@keyframes countUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in {
  animation: countUp 0.4s ease forwards;
}

/* ── Loading Pulse ── */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.loading-pulse { animation: pulse 1.5s ease infinite; }

/* ── Back Link ── */
.premium-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 25px;
  background: rgba(79, 209, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition-fast);
}
.premium-back:hover {
  background: rgba(79, 209, 255, 0.1);
  border-color: var(--border-active);
  box-shadow: var(--shadow-glow);
}

/* ── Footer ── */
.premium-footer {
  text-align: center;
  padding: 24px;
  color: #3a5880;
  font-size: 11px;
  border-top: 1px solid rgba(79, 209, 255, 0.04);
  margin-top: 20px;
}
.premium-footer a { color: #3a5880; text-decoration: none; }