:root {
  /* ── Grayscale ramp (5 stops) ──────────────────────────── */
  --black:        #000000;
  --dark-gray:    #6B6B6B;
  --light-gray:   #D9D9D9;
  --surface:      #F5F5F5;
  --white:        #FFFFFF;

  /* ── Accent & danger ───────────────────────────────────── */
  --accent:        #0097BF;
  --accent-hover:  #007FA3;
  --danger:        #EF4444;

  /* ── Chart palette (bar fills only) ────────────────────── */
  --chart-1:  #0097BF;
  --chart-2:  #3471AD;
  --chart-3:  #124A8A;
  --chart-4:  #7469B1;
  --chart-5:  #2E86AB;
  --chart-6:  #A23B72;
  --chart-7:  #F18F01;
  --chart-8:  #C73E1D;
  --chart-9:  #3B1F2B;
  --chart-10: #44BBA4;

  /* ── Semantic color tokens ─────────────────────────────── */
  --fg-1:     var(--black);
  --fg-2:     var(--dark-gray);
  --fg-3:     var(--light-gray);
  --bg-1:     var(--white);
  --bg-2:     var(--surface);
  --bg-3:     #F1F5F9;
  --border-1: var(--light-gray);
  --border-2: #E2E8F0;

  /* ── Typography ────────────────────────────────────────── */
  --font-display: Impact, "Haettenschweiler", "Arial Narrow Bold", "Arial Black", sans-serif;
  --font-ui:      Arial, "Helvetica Neue", Helvetica, sans-serif;
  --font-mono:    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* ── Type scale ────────────────────────────────────────── */
  --fs-10: 10px;
  --fs-11: 11px;
  --fs-12: 12px;
  --fs-13: 13px;
  --fs-14: 14px;
  --fs-16: 16px;
  --fs-20: 20px;
  --fs-24: 24px;

  /* ── Type weights ──────────────────────────────────────── */
  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;

  /* ── Line heights ──────────────────────────────────────── */
  --lh-tight:  1.05;
  --lh-snug:   1.25;
  --lh-normal: 1.5;

  /* ── Tracking ──────────────────────────────────────────── */
  --tracking-wide: 0.04em;

  /* ── Spacing (4px base) ────────────────────────────────── */
  --space-1:  4px;
  --space-2:  6px;
  --space-3:  8px;
  --space-4:  10px;
  --space-5:  12px;
  --space-6:  16px;
  --space-7:  20px;
  --space-8:  24px;
  --space-9:  32px;
  --space-10: 48px;

  /* ── Radii ─────────────────────────────────────────────── */
  --radius-sm: 6px;
  --radius:    8px;
  --radius-lg: 12px;

  /* ── Shadows ───────────────────────────────────────────── */
  --shadow-card:    0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-overlay: 4px 0 24px rgba(0, 0, 0, 0.12);

  /* ── Motion ────────────────────────────────────────────── */
  --dur-fast:   150ms;
  --dur-layout: 250ms;

  /* ── Layout ────────────────────────────────────────────── */
  --panel-w:       340px;
  --container-max: 1440px;

  /* ── Legacy aliases (used by existing CSS below) ───────── */
  --font:           var(--font-ui);
  --text:           #070707;
  --text-secondary: #6B7280;
  --border:         #E2E8F0;
  --bg:             var(--white);
  --bg-page:        #F1F5F9;
}

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

html, body {
  height: 100%;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
}

/* ── Page wrapper ── */
.container {
  max-width: 1440px;
  margin: 0 auto;
  height: 100%;
}

/* ── Two-column layout ── */
.layout {
  display: flex;
  height: 100vh;
  overflow: hidden;   /* clips the panel as it slides out */
}

/* ── Left panel ── */
.panel-left {
  width: var(--panel-w);
  min-width: var(--panel-w);   /* prevents content reflow during transition */
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  border-right: 1px solid var(--border);
  background: var(--bg);
  margin-left: 0;
  transition: margin-left 0.25s ease;
}

.panel-left.collapsed {
  margin-left: calc(-1 * var(--panel-w));
}

/* ── Mobile backdrop (shown when panel overlays the chart) ── */
.panel-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  z-index: 99;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.app-header {
  padding: 1.25rem 1.25rem 0;
  margin-bottom: 1rem;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.app-wordmark {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--black);
}

.app-title {
  font-size: var(--fs-11);
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

/* Scrollable area above export toolbar */
.controls-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 0 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ── Fields ── */
.field label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

/* ── Inputs (shared) ── */
input[type="text"],
input[type="number"] {
  width: 100%;
  height: 34px;
  padding: 0 10px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color .15s;
}
input[type="text"]:focus,
input[type="number"]:focus { border-color: var(--accent); }

/* ── Phase section ── */
.phase-section { display: flex; flex-direction: column; gap: 0; }

.phase-header,
.phase-row {
  display: grid;
  grid-template-columns: 16px 1fr 58px 58px 36px 28px;
  gap: 5px;
  align-items: center;
}

.phase-header {
  margin-bottom: 5px;
}
.phase-header span {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-secondary);
}

.phase-row {
  margin-bottom: 6px;
  border-radius: 4px;
  transition: box-shadow 0.1s ease, opacity 0.1s ease;
}

/* Drag handle */
.phase-drag-handle {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 32px;
  cursor: grab;
  color: var(--border);
  transition: color 0.15s;
  touch-action: none;
}
.phase-drag-handle:hover { color: var(--text-secondary); }
.phase-drag-handle:active { cursor: grabbing; }

/* Drag states */
.phase-row.dragging        { opacity: 0.35; }
.phase-row.drag-above      { box-shadow: inset 0  2px 0 var(--accent); }
.phase-row.drag-below      { box-shadow: inset 0 -2px 0 var(--accent); }

.phase-row input[type="text"],
.phase-row input[type="number"] { height: 32px; font-size: 12px; }

input[type="color"].phase-color {
  width: 36px;
  height: 32px;
  padding: 2px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  background: none;
}

.phase-remove {
  width: 28px;
  height: 32px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  background: none;
  cursor: pointer;
  font-size: 16px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color .15s, border-color .15s;
}
.phase-remove:hover { color: #ef4444; border-color: #ef4444; }

.btn-add {
  margin-top: 2px;
  height: 32px;
  padding: 0 12px;
  background: none;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
  align-self: flex-start;
  transition: background .15s;
}
.btn-add:hover { background: var(--bg-page); }

/* ── Export toolbar — pinned to panel bottom ── */
.export-toolbar {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  padding: 12px 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--bg);
}

.toolbar-download {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.toolbar-divider {
  width: calc(100% + 2.5rem);
  margin: 10px -1.25rem;
  border: none;
  border-top: 1px solid var(--border);
}

.toolbar-data {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toolbar-data-btns {
  display: flex;
  gap: 6px;
}

.toolbar-hint {
  font-size: var(--fs-11);
  color: var(--text-secondary);
  line-height: var(--lh-snug);
}

.format-group {
  display: flex;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.fmt-btn {
  border: none;
  background: transparent;
  font-family: var(--font);
  font-size: 12px;
  padding: 0 10px;
  height: 32px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-secondary);
  transition: background .15s, color .15s;
}
.fmt-btn.active { background: var(--text); color: #fff; }
.fmt-btn:not(.active):hover { background: var(--bg-page); }

.btn-download {
  height: 32px;
  padding: 0 14px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s;
}
.btn-download:hover { background: #007fa3; }

.btn-copy,
.btn-import {
  height: 32px;
  padding: 0 12px;
  background: none;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background .15s;
}
.btn-copy:hover,
.btn-import:hover { background: var(--bg-page); }

/* ── Right panel: chart ── */
.panel-right {
  flex: 1;
  min-width: 0;
  background: var(--bg-page);
  overflow: auto;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

/* ── Chart header: toggle button bar ── */
.chart-header {
  flex-shrink: 0;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  align-items: center;
}

.btn-panel-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 32px;
  padding: 0 12px;
  background: none;
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s;
}
.btn-panel-toggle:hover { background: var(--bg-page); }

.toggle-icon {
  flex-shrink: 0;
  color: var(--text);
}

/* Chart scroll + padding live inside this wrapper */
.svg-wrapper {
  flex: 1;
  overflow: auto;
  padding: 2rem;
}

.svg-container {
  width: 100%;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

.panel-footer {
  flex-shrink: 0;
  display: flex;
  justify-content: space-between;
  padding: 8px 1.25rem;
  border-top: 1px solid var(--border);
  font-size: var(--fs-10);
  color: var(--text-secondary);
}

/* ── Mobile: panel overlays instead of pushing ── */
@media (max-width: 767px) {
  .panel-left {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    height: 100%;
    box-shadow: var(--shadow-overlay);
    transition: transform 0.25s ease;
    transform: translateX(0);
    margin-left: 0;   /* override the push-based approach */
  }

  .panel-left.collapsed {
    transform: translateX(-100%);
    margin-left: 0;   /* keep layout intact; only transform moves it */
  }

  /* Backdrop: shown as a block, opacity toggled by .visible */
  .panel-backdrop {
    display: block;
    pointer-events: none;
  }
  .panel-backdrop.visible {
    opacity: 1;
    pointer-events: auto;
  }
}

/* ── Typography utility classes ──────────────────────────── */

.label {
  font-family: var(--font-ui);
  font-weight: var(--fw-medium);
  font-size: var(--fs-11);
  color: var(--fg-2);
}

.caption {
  font-family: var(--font-ui);
  font-weight: var(--fw-regular);
  font-size: var(--fs-10);
  color: var(--fg-2);
}

.btn-text {
  font-family: var(--font-ui);
  font-weight: var(--fw-medium);
  font-size: var(--fs-12);
}

.format-text {
  font-family: var(--font-ui);
  font-weight: var(--fw-medium);
  font-size: var(--fs-12);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

code, .mono {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
}