.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--text-main);
  padding: 0 12px 16px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 8px;
}

.brand-mark {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius);
  text-shadow: var(--glow-text);
  box-shadow: var(--glow-shadow);
}

.terminal-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--badge-bg);
  padding: 6px 14px;
  border-radius: var(--radius);
  color: var(--accent);
  border: 1px solid var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
  text-shadow: var(--glow-text);
  white-space: nowrap;
}

.terminal-badge::before {
  content: 'fastviz:~$ ';
  opacity: 0.7;
}

.terminal-badge.muted {
  color: var(--text-muted);
  border-color: var(--border-color);
  text-shadow: none;
}

.terminal-badge.muted::before {
  content: 'user: ';
  opacity: 0.6;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-toggle {
  display: none;
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border-radius: var(--radius);
  color: var(--icon-color);
  transition: all 0.2s ease;
}

.sidebar-toggle:hover {
  color: var(--icon-hover);
  border-color: var(--accent);
  box-shadow: var(--glow-shadow);
}

.sidebar-toggle svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.theme-toggle {
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  cursor: pointer;
  display: grid;
  place-items: center;
  padding: 8px;
  border-radius: var(--radius);
  color: var(--icon-color);
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  color: var(--icon-hover);
  border-color: var(--accent);
  box-shadow: var(--glow-shadow);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-sun {
  display: none;
}

.icon-moon {
  display: block;
}

[data-theme="dark"] .icon-sun {
  display: block;
}

[data-theme="dark"] .icon-moon {
  display: none;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}

.nav-link::before {
  content: '>';
  color: var(--accent);
  opacity: 0.4;
}

.nav-link:hover {
  color: var(--text-main);
  border-color: var(--border-color);
}

.nav-link:hover::before {
  opacity: 0.8;
}

.nav-link.active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--badge-bg);
  text-shadow: var(--glow-text);
}

.nav-link.active::before {
  opacity: 1;
}

.page-title {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-title::before {
  content: '##';
  color: var(--accent);
  opacity: 0.6;
}

.page-subtitle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: -12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.page-subtitle::before {
  content: '// ';
  color: var(--accent);
  opacity: 0.6;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

.kpi-card {
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  overflow: hidden;
  min-width: 0;
  transition: all 0.2s ease;
}

.kpi-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.kpi-card:hover {
  border-color: var(--accent);
  box-shadow: var(--glow-shadow);
}

.kpi-card:hover::before {
  opacity: 1;
}

.kpi-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
}

.kpi-label::before {
  content: '[';
  color: var(--accent);
  margin-right: 2px;
}

.kpi-label::after {
  content: ']';
  color: var(--accent);
  margin-left: 2px;
}

.kpi-value {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-main);
  text-shadow: var(--glow-text);
  line-height: 1.1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kpi-delta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

.kpi-delta.positive {
  color: var(--positive);
}

.kpi-delta.negative {
  color: var(--negative);
}

.kpi-delta.positive::before {
  content: '▲ ';
}

.kpi-delta.negative::before {
  content: '▼ ';
}

.chart-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
}

.chart-card {
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
}

.chart-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-main);
}

.chart-title::before {
  content: '> ';
  color: var(--accent);
}

.chart-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  border-radius: var(--radius);
}

.chart-body {
  padding: 16px 20px 20px;
  height: 320px;
}

@media (max-width: 1100px) {
  .chart-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .sidebar-toggle {
    display: inline-flex;
  }
  .theme-toggle {
    min-width: 40px;
    min-height: 40px;
  }
  .app-header > .terminal-badge {
    display: none;
  }
}

@media (max-width: 600px) {
  .kpi-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .kpi-card {
    padding: 16px;
  }
  .kpi-value {
    font-size: 1.5rem;
  }
  .page-title {
    font-size: 1.2rem;
  }
  .chart-body {
    height: 240px;
    padding: 12px;
  }
  .theme-toggle {
    min-width: 44px;
    min-height: 44px;
    padding: 10px;
  }
}

@media (max-width: 400px) {
  .kpi-value {
    font-size: 1.3rem;
  }
  .page-title {
    font-size: 1.1rem;
  }
  .app-main {
    padding: 10px;
  }
}

/* ─── FILTER BAR ─── */
.filter-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 10px 14px;
  position: sticky;
  top: 64px;
  z-index: 50;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.filter-preset {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 5px 10px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-preset:hover {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--glow-shadow);
}

.filter-preset.active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--badge-bg);
  text-shadow: var(--glow-text);
}

.filter-field {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.filter-field input,
.filter-select {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-main);
  background: var(--terminal-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 5px 8px;
  max-width: 150px;
}

.filter-field input:focus,
.filter-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--glow-shadow);
}

.filter-select {
  cursor: pointer;
  max-width: 180px;
}

.filter-reset {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  background: transparent;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 5px 12px;
  cursor: pointer;
  margin-left: auto;
  transition: all 0.15s ease;
}

.filter-reset:hover {
  color: var(--negative);
  border-color: var(--negative);
}

@media (max-width: 900px) {
  .filter-bar {
    top: 56px;
  }
  .filter-reset {
    margin-left: 0;
  }
}

@media (max-width: 600px) {
  .filter-bar {
    top: 52px;
    padding: 8px 10px;
  }
  .filter-field input,
  .filter-select {
    max-width: 130px;
  }
}

/* ─── TAB PANELS ─── */
.tab-panel {
  display: none;
  flex-direction: column;
  gap: 16px;
}

.tab-panel.active {
  display: flex;
  animation: fadeIn 0.25s ease;
}

.kpi-value-sm {
  font-size: 1.05rem;
  line-height: 1.3;
  word-break: break-word;
}

/* ─── SETTINGS PLACEHOLDER ─── */
.placeholder-box {
  border: 1px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 48px 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.placeholder-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  text-shadow: var(--glow-text);
}

.placeholder-box p {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 480px;
}