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

:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --border: #e5e5ea;
  --radius: 16px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --green: #34c759;
  --blue: #007aff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --surface: #2c2c2e;
    --text: #f5f5f7;
    --text-secondary: #98989d;
    --border: #38383a;
    --shadow: 0 2px 12px rgba(0,0,0,0.3);
  }
}

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  padding-bottom: env(safe-area-inset-bottom);
}

/* Header */
.app-header {
  padding: 56px 20px 16px;
  padding-top: calc(56px + env(safe-area-inset-top));
}

.app-header h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.app-header p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Card Tabs */
.card-tabs {
  display: flex;
  gap: 8px;
  padding: 0 20px 20px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.card-tabs::-webkit-scrollbar { display: none; }

.tab-btn {
  flex-shrink: 0;
  padding: 8px 16px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.tab-btn.active {
  background: var(--card-color, var(--blue));
  border-color: var(--card-color, var(--blue));
  color: #fff;
}

/* Sync Bar */
.sync-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px 16px;
  min-height: 44px;
}

.sync-status {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Perks Grid */
.perks-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 0 16px 32px;
}

@media (min-width: 480px) {
  .perks-grid { grid-template-columns: 1fr 1fr; }
}

/* Perk Tile */
.perk-tile {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow);
}

/* Ring */
.perk-ring-wrap {
  position: relative;
  width: 60px;
  height: 60px;
  flex-shrink: 0;
}

.perk-ring {
  width: 60px;
  height: 60px;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 4;
}

.ring-fill {
  fill: none;
  stroke-width: 4;
  stroke-linecap: round;
  transition: stroke-dasharray 0.6s ease;
}

.ring-fill.complete {
  stroke: var(--green) !important;
}

.ring-pct {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--text);
}

/* Perk Info */
.perk-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.perk-label {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.perk-cycle {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: capitalize;
}

.perk-amounts {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  margin-top: 2px;
}

.perk-amounts .used { color: var(--text-secondary); }
.perk-amounts .sep { color: var(--border); }
.perk-amounts .remaining { font-weight: 600; color: var(--blue); }
.perk-amounts .remaining.zero { color: var(--green); }

.perk-desc {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Buttons */
.btn-primary {
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  -webkit-tap-highlight-color: transparent;
  transition: opacity 0.15s;
  width: 100%;
}
.btn-primary:disabled { opacity: 0.5; }

.btn-secondary {
  background: var(--surface);
  color: var(--blue);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  min-height: 36px;
  -webkit-tap-highlight-color: transparent;
}
.btn-secondary:disabled { opacity: 0.5; }

/* Toast */
.toast {
  position: fixed;
  bottom: calc(24px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: rgba(0,0,0,0.85);
  color: #fff;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  pointer-events: none;
  transition: transform 0.3s ease;
  white-space: nowrap;
  z-index: 100;
}
.toast.visible { transform: translateX(-50%) translateY(0); }