:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: rgba(18, 25, 46, 0.84);
  --panel-strong: #17213d;
  --text: #f7f9ff;
  --muted: #9daccc;
  --accent: #76e4f7;
  --accent-2: #a68bff;
  --danger: #ff7a90;
  --line: rgba(255, 255, 255, 0.12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: radial-gradient(circle at top left, rgba(118, 228, 247, 0.22), transparent 34%),
    radial-gradient(circle at 85% 15%, rgba(166, 139, 255, 0.22), transparent 28%), var(--bg);
}
button, input { font: inherit; }
.shell { width: min(1440px, calc(100% - 32px)); margin: 0 auto; padding: 32px 0; }
.hero { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
h1 { font-size: clamp(2rem, 5vw, 4.6rem); line-height: 1; margin: 0 0 16px; }
.lead { max-width: 760px; color: var(--muted); font-size: 1.05rem; }
.mode-card, .panel { border: 1px solid var(--line); background: var(--panel); box-shadow: 0 24px 80px rgba(0,0,0,.28); backdrop-filter: blur(18px); border-radius: 28px; }
.mode-card { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 8px; min-width: 280px; }
.mode-button, .export-button { border: 0; border-radius: 20px; padding: 14px 22px; color: var(--muted); background: transparent; cursor: pointer; }
.mode-button.active { color: #06111a; background: linear-gradient(135deg, var(--accent), var(--accent-2)); font-weight: 800; }
.export-button { grid-column: 1 / -1; border: 1px solid var(--line); color: var(--text); background: var(--panel-strong); }
.workspace { display: grid; grid-template-columns: 420px 1fr; gap: 24px; align-items: start; }
.panel { padding: 24px; }
.panel-heading, .preview-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
h2 { margin: 0; }
.secondary, .remove { border: 1px solid var(--line); color: var(--text); background: var(--panel-strong); border-radius: 14px; padding: 10px 14px; cursor: pointer; }
.rows { display: grid; gap: 12px; margin: 18px 0 24px; }
.row { display: grid; grid-template-columns: 1fr 92px 58px 42px; gap: 8px; align-items: end; padding: 12px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.04); }
label { display: grid; gap: 7px; color: var(--muted); font-size: .9rem; }
input { width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; color: var(--text); background: rgba(8, 12, 24, .75); }
input[type="range"] { padding: 0; accent-color: var(--accent); }
input[type="color"] { min-height: 42px; padding: 4px; cursor: pointer; }
.remove { color: var(--danger); padding: 10px; }
.settings-grid { display: grid; gap: 16px; }
.preview { min-height: 680px; }
#mode-pill { color: #06111a; background: var(--accent); border-radius: 999px; padding: 8px 14px; font-weight: 800; }
#total-label, .hint { color: var(--muted); margin: 6px 0 0; }
#chart { width: 100%; height: min(68vh, 760px); display: block; cursor: grab; }
#chart:active { cursor: grabbing; }
.hint { text-align: center; }
@media (max-width: 980px) { .hero, .workspace { grid-template-columns: 1fr; display: grid; } .workspace { grid-template-columns: 1fr; } }