/* =============================================
   ChartForge — Light Theme
   Critical layout rules:
   - #chartBox has a fixed px height
   - canvas fills chartBox via position:absolute
   - empty-state and export-bar are SIBLINGS of chartBox, never children
   - Legend is forced to 'top' in JS config
============================================= */

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

:root {
  --bg:       #f1ede6;
  --surface:  #ffffff;
  --border:   #e2dbd0;
  --border2:  #c8bfb2;
  --blue:     #3b82f6;
  --blue-dk:  #2563eb;
  --blue-lt:  #eff6ff;
  --red:      #dc2626;
  --red-dk:   #b91c1c;
  --text:     #18181b;
  --text2:    #52525b;
  --text3:    #a1a1aa;
  --r:        12px;
  --r-sm:     8px;
  --font:     'Plus Jakarta Sans', sans-serif;
  --mono:     'DM Mono', monospace;
  --sh:       0 1px 3px rgba(0,0,0,.06), 0 6px 20px rgba(0,0,0,.07);
  --sh-lg:    0 2px 8px rgba(0,0,0,.06), 0 12px 40px rgba(0,0,0,.09);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ──────────────────────────────── */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 36px;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 1px 0 var(--border);
  flex-shrink: 0;
}
.logo { display: flex; align-items: center; gap: 9px; }
.logo-text { font-size: 20px; font-weight: 700; letter-spacing: -.4px; color: var(--text); }
.logo-text strong { color: var(--blue); }
.tagline { font-size: 12px; color: var(--text3); margin-left: auto; font-family: var(--mono); }

/* ── App layout ──────────────────────────── */
.app {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 20px;
  padding: 20px 36px 24px;
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  align-items: start;
}
@media (max-width: 840px) {
  .app { grid-template-columns: 1fr; padding: 14px; }
  .header { padding: 0 18px; }
}

/* ── Sidebar panels ──────────────────────── */
.sidebar { display: flex; flex-direction: column; gap: 14px; }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 18px;
  box-shadow: var(--sh);
}

.panel-head {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 14px;
}
.panel-head h2 { font-size: 14px; font-weight: 700; color: var(--text); }
.head-btns { margin-left: auto; display: flex; gap: 6px; }
.head-btns button {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 20px; font-size: 11px; font-weight: 600;
  color: var(--text2); padding: 3px 10px; cursor: pointer;
  font-family: var(--font); transition: all .14s;
}
.head-btns button:hover { border-color: var(--border2); color: var(--text); }

.badge {
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--blue); color: #fff;
  font-size: 11px; font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

/* ── Hint box ────────────────────────────── */
.hint-box {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--r-sm); padding: 8px 11px;
  margin-bottom: 8px; display: flex; flex-direction: column; gap: 3px;
}
.hint-code { font-family: var(--mono); font-size: 11.5px; color: var(--blue); }
.hint-sub  { font-family: var(--mono); font-size: 10px; color: var(--text3); }

/* ── Textarea ────────────────────────────── */
textarea {
  display: block; width: 100%;
  height: 170px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--r-sm); color: var(--text);
  font-family: var(--mono); font-size: 12px; line-height: 1.8;
  padding: 10px 12px; resize: vertical; outline: none;
  transition: border-color .16s, box-shadow .16s;
}
textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(59,130,246,.12); }
textarea::placeholder { color: var(--text3); }

/* ── Error box ───────────────────────────── */
.error-box {
  background: #fef2f2; border: 1px solid #fecaca;
  border-radius: var(--r-sm); padding: 8px 11px;
  font-size: 11px; color: var(--red); font-family: var(--mono);
  margin-top: 8px; line-height: 1.5;
}

/* ── Generate button ─────────────────────── */
.btn-generate {
  display: flex; align-items: center; justify-content: center; gap: 7px;
  width: 100%; margin-top: 12px;
  background: var(--blue); color: #fff;
  border: none; border-radius: var(--r-sm);
  font-family: var(--font); font-size: 14px; font-weight: 700;
  padding: 11px 20px; cursor: pointer;
  box-shadow: 0 2px 10px rgba(59,130,246,.32);
  transition: all .16s;
}
.btn-generate:hover { background: var(--blue-dk); box-shadow: 0 4px 16px rgba(59,130,246,.4); transform: translateY(-1px); }
.btn-generate:active { transform: none; }

/* ── Chart type grid ─────────────────────── */
.type-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 5px; }
.type-btn {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; padding: 8px 3px;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-sm);
  font-family: var(--font); font-size: 10px; font-weight: 600; color: var(--text2);
  cursor: pointer; transition: all .14s; line-height: 1.2;
}
.type-btn:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-lt); }
.type-btn.active { background: var(--blue); border-color: var(--blue); color: #fff; }
.ti { font-size: 12px; }

.warn-box {
  margin-top: 10px; padding: 7px 10px;
  font-size: 11px; color: #92400e; line-height: 1.5;
  background: #fffbeb; border: 1px solid #fde68a; border-radius: 6px;
}

/* ── Palette grid ────────────────────────── */
.pal-grid { display: flex; flex-wrap: wrap; gap: 6px; }
.pal-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 10px 5px 6px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 20px;
  font-family: var(--font); font-size: 11.5px; font-weight: 600; color: var(--text2);
  cursor: pointer; transition: all .14s;
}
.pal-btn:hover { border-color: var(--border2); color: var(--text); }
.pal-btn.active { border-color: var(--blue); color: var(--blue); background: var(--blue-lt); }
.swatches { display: flex; gap: 2px; }
.swatches i { display: block; width: 9px; height: 9px; border-radius: 50%; font-style: normal; }

/* ===========================================
   CHART SECTION — the most important part.

   #chartBox has a FIXED height. The <canvas>
   is positioned absolutely inside it so
   Chart.js always gets a real pixel size.

   emptyState and exportBar are OUTSIDE
   chartBox so they can never overlap the chart.
=========================================== */
.chart-section { display: flex; flex-direction: column; }

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px;
  box-shadow: var(--sh-lg);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.chart-info-row {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
}
.chart-title {
  font-size: 14px; font-weight: 600; color: var(--text2);
  font-style: italic; line-height: 1.4;
}
.chart-stats {
  font-family: var(--mono); font-size: 10px; color: var(--text3);
  text-align: right; line-height: 1.7; flex-shrink: 0;
}

/* Empty state — a sibling of chartBox */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 360px;
  text-align: center;
  padding: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}
.empty-state svg { opacity: .4; }
.empty-state p { font-size: 15px; font-weight: 600; color: var(--text2); }
.empty-state span { font-size: 11px; color: var(--text3); font-family: var(--mono); }

/* chartBox: fixed height container, canvas is absolute inside */
.chart-box {
  position: relative;
  width: 100%;
  height: 420px;          /* fixed height — chart fills this exactly */
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  overflow: hidden;
}

/* Canvas fills chartBox via absolute positioning.
   This means Chart.js always reads real px dimensions. */
.chart-box canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100% !important;
  height: 100% !important;
}

/* Export bar — always a sibling of chartBox */
.export-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.exp-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: var(--r-sm); border: none;
  font-family: var(--font); font-size: 12px; font-weight: 600;
  cursor: pointer; transition: all .15s;
}
.exp-png { background: var(--blue); color: #fff; box-shadow: 0 2px 8px rgba(59,130,246,.25); }
.exp-png:hover { background: var(--blue-dk); transform: translateY(-1px); }

.exp-pdf { background: var(--red); color: #fff; box-shadow: 0 2px 8px rgba(220,38,38,.22); }
.exp-pdf:hover { background: var(--red-dk); transform: translateY(-1px); }

.exp-copy {
  background: var(--surface); color: var(--text2);
  border: 1px solid var(--border);
}
.exp-copy:hover { border-color: var(--border2); color: var(--text); }

.stats-chip {
  margin-left: auto;
  padding: 4px 12px; border-radius: 16px;
  background: var(--bg); border: 1px solid var(--border);
  font-family: var(--mono); font-size: 10px; color: var(--text3);
  white-space: nowrap;
}

/* ── Toast ───────────────────────────────── */
.toast {
  position: fixed; bottom: 24px; right: 24px; z-index: 9999;
  background: #18181b; color: #fff;
  font-family: var(--font); font-size: 13px; font-weight: 600;
  padding: 10px 20px; border-radius: 30px;
  box-shadow: 0 4px 20px rgba(0,0,0,.2);
  opacity: 0; transform: translateY(8px); pointer-events: none;
  transition: all .24s cubic-bezier(.34,1.56,.64,1);
}
.toast.show { opacity: 1; transform: translateY(0); }

/* ── [hidden] override — works with HTML hidden attribute ── */
[hidden] { display: none !important; }