/* ── Performance Page — Enhanced UI ───────────────────────────────────── */

.perf-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.perf-header {
  margin-bottom: 28px;
}
.perf-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}
.perf-subtitle {
  font-size: var(--fs-14);
  color: var(--muted);
  margin: 0;
}

/* ── Empty state ─────────────────────────────────────────────────────── */
.perf-empty {
  text-align: center;
  padding: 56px 20px;
}
.perf-empty::before {
  content: '';
  display: block;
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: var(--radius-lg);
  background: var(--accent-glow-08);
  border: 2px dashed var(--accent-glow-20);
}
.perf-empty p {
  color: var(--muted);
  margin-bottom: 20px;
  font-size: var(--fs-base);
}

/* ── Controls ────────────────────────────────────────────────────────── */
.perf-controls {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.perf-select-wrap {
  flex: 1;
  min-width: 200px;
}
.perf-label {
  display: block;
  font-size: var(--fs-xs);
  color: var(--muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}
.perf-select {
  width: 100%;
  padding: 10px 16px;
  font-size: var(--fs-14);
  font-family: var(--mono);
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5l3 3 3-3' stroke='%2364748b' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.perf-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow-15);
}

/* Period selector — pill tabs */
.perf-periods {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
}
.perf-period {
  padding: 8px 16px;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--muted);
  background: transparent;
  border: none;
  border-radius: calc(12px - 2px);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 36px;
}
.perf-period:hover {
  color: var(--text);
  background: var(--border0);
}
.perf-period.is-active {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--white);
  box-shadow: 0 2px 8px var(--accent-glow-30);
}

/* ── KPI Stats cards ─────────────────────────────────────────────────── */
.perf-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.perf-stat {
  padding: 20px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  text-align: center;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}
.perf-stat::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: 0;
  transition: opacity 0.2s ease;
}
.perf-stat:hover {
  border-color: var(--accent-glow-15);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--black-15);
}
.perf-stat:hover::before {
  opacity: 1;
}
.perf-stat-value {
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.perf-stat-value.is-good { color: var(--success); }
.perf-stat-value.is-warn { color: var(--yellow); }
.perf-stat-value.is-bad { color: var(--danger); }
.perf-stat-label {
  font-size: var(--fs-2xs);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 500;
}

/* Trend arrow indicator */
.perf-stat-trend {
  display: inline-block;
  font-size: var(--fs-sm);
  margin-left: 4px;
  font-weight: 700;
}
.perf-stat-trend--up { color: var(--success); }
.perf-stat-trend--down { color: var(--danger); }

/* ── Chart card ──────────────────────────────────────────────────────── */
.perf-chart-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.perf-chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.perf-chart-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}
.perf-chart-title span {
  font-weight: 400;
  color: var(--muted);
  font-size: var(--fs-sm);
}
.perf-chart-wrap {
  position: relative;
  width: 100%;
}
.perf-chart-wrap canvas {
  display: block;
  width: 100%;
  height: auto;
}
.perf-chart-loading,
.perf-chart-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-14);
  color: var(--muted);
  background: var(--glass-bg);
  border-radius: var(--radius);
  backdrop-filter: blur(4px);
}
.perf-chart-loading span,
.perf-chart-empty span {
  padding: 16px 28px;
  background: var(--surface2);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ── Tooltip ─────────────────────────────────────────────────────────── */
.perf-chart-tooltip {
  position: absolute;
  z-index: 10;
  padding: 10px 16px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: var(--fs-xs);
  font-family: var(--mono);
  color: var(--text);
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 0 8px 24px var(--black-35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.perf-chart-tooltip .tt-time {
  color: var(--muted);
  margin-bottom: 4px;
  font-size: var(--fs-2xs);
}
.perf-chart-tooltip .tt-value {
  font-weight: 700;
  color: var(--accent);
  font-size: var(--fs-14);
}

/* Glass morphism card mixin */
.perf-card {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: border-color 0.2s cubic-bezier(0.4, 0, 0.2, 1), transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.perf-card:hover {
  border-color: var(--accent-glow-15);
}

/* ── Chart Legend ─────────────────────────────────────────────────────── */
.perf-chart-legend {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 14px;
  font-size: var(--fs-xs);
  color: var(--muted);
}
.perf-chart-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}
.perf-chart-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-xs);
}

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .perf-page {
    padding: 20px 12px 40px;
  }
  .perf-header h1 {
    font-size: 22px;
  }
  .perf-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .perf-periods {
    align-self: flex-start;
  }
  .perf-period {
    min-height: 44px;
    padding: 10px 16px;
  }
  .perf-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .perf-stat {
    padding: 16px 12px;
  }
  .perf-stat-value {
    font-size: 20px;
  }
  .perf-chart-card {
    padding: 16px;
  }
}

@media (max-width: 400px) {
  .perf-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .perf-stat-value {
    font-size: 18px;
  }
}

/* Wave 98 — mobile vs desktop Web Vitals comparison
   DESIGN.md tokens only. Verdicts mapped to --green/--yellow/--red
   so the same palette as /speed grades is reused. */
.perf-comparison-card {
  margin-bottom: 24px;
  padding: 20px;
}
.perf-comparison-header h2 {
  margin: 0 0 4px;
  font-size: 18px;
}
.perf-comparison-sub {
  margin: 0 0 16px;
  color: var(--muted2, #94a3b8);
  font-size: 14px;
}
.perf-comparison-form {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.perf-comparison-form input[type="url"] {
  flex: 1 1 280px;
  min-width: 0;
  padding: 10px 12px;
  background: var(--surface2, #1a1e2e);
  border: 1px solid var(--border2, rgba(255, 255, 255, 0.12));
  border-radius: var(--radius-sm, 7px);
  color: var(--text, #e2e8f0);
  font-family: var(--mono, monospace);
  font-size: 14px;
}
.perf-comparison-form input[type="url"]:focus {
  outline: none;
  border-color: var(--accent, #5b8af8);
}
.perf-comparison-loading {
  padding: 12px;
  color: var(--muted2, #94a3b8);
  font-size: 14px;
}
.perf-comparison-error {
  padding: 12px;
  border-radius: var(--radius-sm, 7px);
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid var(--red, #f87171);
  color: var(--red, #f87171);
  font-size: 14px;
}

.perf-comparison-grid {
  margin-bottom: 16px;
}
.perf-comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.perf-comparison-table th,
.perf-comparison-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border, rgba(255, 255, 255, 0.07));
  vertical-align: top;
}
.perf-comparison-table th {
  color: var(--muted2, #94a3b8);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.04em;
}
.perf-metric-row .perf-value {
  font-family: var(--mono, monospace);
  font-weight: 500;
}
.perf-metric-row--gap {
  background: rgba(251, 191, 36, 0.04);
}
.perf-gap {
  font-family: var(--mono, monospace);
  color: var(--muted2, #94a3b8);
}
.perf-cell-mobile,
.perf-cell-desktop {
  white-space: nowrap;
}

.perf-verdict {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  margin-left: 4px;
  white-space: nowrap;
}
.perf-verdict--good {
  background: rgba(52, 211, 153, 0.12);
  color: var(--green, #34d399);
}
.perf-verdict--needs_improvement {
  background: rgba(251, 191, 36, 0.12);
  color: var(--yellow, #fbbf24);
}
.perf-verdict--poor {
  background: rgba(248, 113, 113, 0.12);
  color: var(--red, #f87171);
}
.perf-verdict--unknown {
  background: var(--surface2, #1a1e2e);
  color: var(--muted, #64748b);
}

.perf-comparison-gaps,
.perf-comparison-recs,
.perf-comparison-crux {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border, rgba(255, 255, 255, 0.07));
}
.perf-gap-title,
.perf-rec-title,
.perf-crux-title {
  margin: 0 0 8px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted2, #94a3b8);
}
.perf-gap-list,
.perf-rec-list,
.perf-crux-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.perf-gap-flag {
  padding: 8px 12px;
  margin-bottom: 6px;
  background: rgba(251, 191, 36, 0.08);
  border-left: 3px solid var(--yellow, #fbbf24);
  border-radius: var(--radius-sm, 7px);
  color: var(--text, #e2e8f0);
  font-size: 14px;
}
.perf-recommendation {
  padding: 10px 12px;
  margin-bottom: 6px;
  background: var(--surface2, #1a1e2e);
  border-left: 3px solid var(--border2, rgba(255, 255, 255, 0.12));
  border-radius: var(--radius-sm, 7px);
  color: var(--text, #e2e8f0);
  font-size: 14px;
}
.perf-recommendation--poor {
  border-left-color: var(--red, #f87171);
}
.perf-recommendation--needs_improvement {
  border-left-color: var(--yellow, #fbbf24);
}
.perf-crux-sub {
  color: var(--muted2, #94a3b8);
  font-size: 12px;
  margin: -4px 0 10px;
}
.perf-crux-list li {
  padding: 6px 0;
  border-bottom: 1px solid var(--border, rgba(255, 255, 255, 0.07));
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 14px;
}
.perf-crux-key {
  color: var(--muted2, #94a3b8);
  font-size: 13px;
  flex: 1 1 200px;
}

@media (max-width: 600px) {
  .perf-comparison-table th,
  .perf-comparison-table td {
    padding: 8px 6px;
    font-size: 13px;
  }
  .perf-comparison-table th:nth-child(4),
  .perf-comparison-table td:nth-child(4) {
    display: none;
  }
}