:root {
  --bg: #081018;
  --bg-soft: #0d1824;
  --surface: rgba(12, 22, 34, 0.94);
  --surface-strong: #132234;
  --surface-soft: #192a3d;
  --border: rgba(144, 166, 191, 0.16);
  --border-strong: rgba(144, 166, 191, 0.3);
  --text: #ecf3fc;
  --muted: #91a6c2;
  --accent: #61d0a8;
  --accent-soft: rgba(97, 208, 168, 0.14);
  --success: #71d28d;
  --warning: #f0bc67;
  --danger: #ff7b7b;
  --info: #71beff;
  --shadow: 0 24px 58px rgba(0, 0, 0, 0.28);
  --radius: 18px;
  --radius-sm: 12px;
  --font-ui: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(113, 190, 255, 0.14), transparent 24%),
    radial-gradient(circle at 90% 0, rgba(97, 208, 168, 0.12), transparent 20%),
    linear-gradient(180deg, #08111b 0%, #061019 100%);
  color: var(--text);
  font-family: var(--font-ui);
}

button,
input {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

.history-shell {
  width: min(1500px, calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 32px;
}

.topbar,
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px;
}

.topbar__eyebrow,
.panel-head__eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.topbar h1,
.panel-head h2,
.chart-panel__head h3 {
  margin: 0;
  letter-spacing: -0.04em;
}

.topbar h1 {
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1;
}

.topbar__subtitle {
  margin: 12px 0 0;
  max-width: 720px;
  color: var(--muted);
  line-height: 1.6;
}

.topbar__actions {
  display: grid;
  justify-items: end;
  gap: 12px;
  min-width: 320px;
}

.topbar__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(130px, 1fr));
  gap: 10px;
  width: 100%;
}

.meta-card,
.hero-stat,
.change-card,
.analysis-card,
.selected-point-card {
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
}

.meta-card__label,
.hero-stat__label,
.change-card__label,
.panel-head__hint {
  color: var(--muted);
  font-size: 12px;
}

.meta-card strong,
.hero-stat strong {
  display: block;
  margin-top: 6px;
}

.banner {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid transparent;
  line-height: 1.5;
}

.banner--danger {
  background: rgba(255, 123, 123, 0.12);
  border-color: rgba(255, 123, 123, 0.24);
  color: #ffcaca;
}

.banner--warning {
  background: rgba(240, 188, 103, 0.12);
  border-color: rgba(240, 188, 103, 0.24);
  color: #ffe0ab;
}

.hidden {
  display: none !important;
}

.history-layout {
  display: grid;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  gap: 14px;
  margin-top: 12px;
  align-items: start;
}

.panel {
  padding: 18px;
}

.sidebar {
  position: sticky;
  top: 18px;
}

.detail-stack {
  display: grid;
  gap: 14px;
}

.panel-head,
.chart-panel__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: end;
  margin-bottom: 14px;
}

.chart-panel__summary {
  display: grid;
  justify-items: end;
  gap: 8px;
}

.search-box {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 13px;
}

.search-box input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}

.symbol-list {
  display: grid;
  gap: 8px;
  max-height: calc(100vh - 280px);
  overflow: auto;
}

.symbol-item {
  width: 100%;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
  text-align: left;
  cursor: pointer;
}

.symbol-item.is-active,
.symbol-item:hover {
  border-color: rgba(113, 190, 255, 0.42);
  background: rgba(113, 190, 255, 0.08);
}

.symbol-item__top,
.symbol-item__bottom {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.symbol-item__top strong {
  font-size: 15px;
}

.symbol-item__bottom {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

.detail-hero,
.change-grid,
.analysis-grid {
  display: grid;
  gap: 12px;
}

.detail-hero {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 14px;
}

.chart-panel {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-strong);
  padding: 16px;
}

.control-bar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.025);
}

.control-group {
  display: grid;
  gap: 8px;
}

.control-group__label {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.button-cluster {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.segment-button {
  appearance: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.segment-button.is-active {
  border-color: rgba(113, 190, 255, 0.42);
  background: rgba(113, 190, 255, 0.12);
  color: var(--text);
}

.analysis-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 14px;
}

.analysis-card__label {
  color: var(--muted);
  font-size: 12px;
}

.analysis-card__value {
  display: block;
  margin-top: 8px;
  font-size: 22px;
  font-weight: 700;
}

.analysis-card__hint {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.chart-canvas {
  min-height: 360px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background:
    linear-gradient(180deg, rgba(113, 190, 255, 0.03), rgba(97, 208, 168, 0.02)),
    var(--bg-soft);
  overflow: hidden;
}

.chart-svg {
  display: block;
  width: 100%;
  height: 360px;
}

.chart-grid-line {
  stroke: rgba(144, 166, 191, 0.12);
  stroke-width: 1;
}

.chart-path {
  fill: none;
  stroke: var(--info);
  stroke-width: 3.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart-path--positive {
  stroke: var(--success);
}

.chart-path--negative {
  stroke: var(--danger);
}

.chart-area {
  fill: rgba(113, 190, 255, 0.14);
}

.chart-point {
  fill: var(--accent);
  cursor: pointer;
}

.chart-point.is-active,
.chart-last-point {
  fill: #ffd277;
}

.chart-last-point {
  stroke: rgba(255, 210, 119, 0.28);
  stroke-width: 10;
}

.chart-marker {
  fill: #ff9f6b;
  stroke: #2c1408;
  stroke-width: 1.5;
}

.chart-label {
  fill: var(--muted);
  font-size: 11px;
  font-family: var(--font-mono);
}

.change-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.performance-pill {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 700;
}

.performance-pill--positive {
  color: #d8ffe4;
  background: rgba(113, 210, 141, 0.14);
}

.performance-pill--negative {
  color: #ffd3d3;
  background: rgba(255, 123, 123, 0.14);
}

.performance-pill--neutral {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.change-card__value {
  display: block;
  margin-top: 8px;
  font-size: 22px;
  font-weight: 700;
}

.change-card__hint {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.tone-positive .change-card__value {
  color: var(--success);
}

.tone-negative .change-card__value {
  color: var(--danger);
}

.tone-neutral .change-card__value {
  color: var(--text);
}

.selected-point-card {
  margin-top: 14px;
}

.selected-point-card__grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.selected-point-card__item span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.selected-point-card__item strong {
  display: block;
  margin-top: 6px;
  font-size: 15px;
}

.signal-marker-panel {
  margin-top: 14px;
  padding: 14px;
  border: 1px dashed var(--border-strong);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.02);
}

.signal-marker-panel__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.signal-marker-content {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.button {
  appearance: none;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
  padding: 10px 14px;
  border-radius: 12px;
}

.button--ghost {
  background: rgba(255, 255, 255, 0.02);
}

.empty-state {
  padding: 22px;
  border: 1px dashed var(--border-strong);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
}

.empty-state h3 {
  margin: 0 0 8px;
}

.empty-state p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 1100px) {
  .history-layout,
  .topbar,
  .detail-hero,
  .change-grid,
  .analysis-grid,
  .selected-point-card__grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
  }

  .topbar__actions,
  .topbar__meta {
    justify-items: stretch;
  }

  .sidebar {
    position: static;
  }

  .control-bar {
    flex-direction: column;
  }
}

@media (max-width: 760px) {
  .history-shell {
    width: min(100%, calc(100% - 18px));
    padding-top: 16px;
  }

  .topbar,
  .panel {
    padding: 16px;
    border-radius: 16px;
  }

  .chart-canvas,
  .chart-svg {
    min-height: 280px;
    height: 280px;
  }
}