/* Black glass and a hard corporate red: chamfered panels, HUD corner marks, condensed uppercase labels.
   Dark is the default; light is the white-and-red of a corporate lobby. */
:root {
  --bg: #070708;
  --bg-grid: rgba(255, 42, 58, 0.035);
  --glow: rgba(255, 42, 58, 0.10);
  --surface: #0e0e11;
  --surface-2: #131317;
  --edge: #3a1219;
  --ink: #f1efef;
  --ink-2: #b8b3b4;
  --ink-3: #8a8486;
  --line: #2a1b1e;
  --grid: #1d1a1c;
  --axis: #4d3d41;
  --accent: #ff2a3a;
  --accent-soft: #2a0d12;
  --on-accent: #0a0a0b;
  --warn: #f2c14b;
  --warn-soft: #2a220c;
  /* maturity ramp, short to long (adjacent ΔE ≥ 14 on the surface) */
  --m1: #7a1622; --m2: #bf2232; --m3: #ff3b4a; --m4: #ffa3aa;
  --ref: #8a8486;
  --display: "Rajdhani", "Inter", system-ui, sans-serif;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --cut: 14px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #e9e7e3; --bg-grid: rgba(192, 13, 39, 0.045); --glow: rgba(192, 13, 39, 0.07);
    --surface: #f7f6f3; --surface-2: #efede9; --edge: #d9b9bd;
    --ink: #111012; --ink-2: #4a4547; --ink-3: #6f696b; --line: #ddd6d5; --grid: #e6e1df; --axis: #b9adae;
    --accent: #c00d27; --accent-soft: #f6e1e3; --on-accent: #ffffff; --warn: #8a5a00; --warn-soft: #f7ecd2;
    --m1: #f0a3a8; --m2: #e0505c; --m3: #c00d27; --m4: #6e0717; --ref: #7d7678;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #e9e7e3; --bg-grid: rgba(192, 13, 39, 0.045); --glow: rgba(192, 13, 39, 0.07);
  --surface: #f7f6f3; --surface-2: #efede9; --edge: #d9b9bd;
  --ink: #111012; --ink-2: #4a4547; --ink-3: #6f696b; --line: #ddd6d5; --grid: #e6e1df; --axis: #b9adae;
  --accent: #c00d27; --accent-soft: #f6e1e3; --on-accent: #ffffff; --warn: #8a5a00; --warn-soft: #f7ecd2;
  --m1: #f0a3a8; --m2: #e0505c; --m3: #c00d27; --m4: #6e0717; --ref: #7d7678;
  color-scheme: light;
}

* { box-sizing: border-box; }
body {
  margin: 0; color: var(--ink); font: 15px/1.55 var(--sans); -webkit-font-smoothing: antialiased;
  background:
    radial-gradient(1200px 500px at 85% -10%, var(--glow), transparent 70%),
    linear-gradient(var(--bg-grid) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px) 0 0 / 48px 48px,
    var(--bg);
  background-attachment: fixed;
}
a { color: var(--accent); }
h2, h3 { font-family: var(--display); font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
button, select, input { font: inherit; color: inherit; }
::selection { background: var(--accent); color: var(--on-accent); }

/* ---------------------------------------------------------------- bar */
.bar {
  display: flex; align-items: center; gap: 16px; padding: 10px 24px; position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
  box-shadow: inset 0 -2px 0 0 transparent;
}
.bar::after { content: ""; position: absolute; left: 0; bottom: -1px; width: 220px; height: 2px; background: var(--accent); }
.mark { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 700 1.3rem var(--display); letter-spacing: 0.14em; text-transform: uppercase; }
.mark svg { width: 30px; height: 30px; }
.tagline { color: var(--ink-3); font: 500 0.78rem var(--mono); text-transform: uppercase; letter-spacing: 0.12em; padding-left: 14px; border-left: 1px solid var(--line); }
.bar-actions { margin-left: auto; display: flex; gap: 8px; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); text-decoration: none; cursor: pointer; font: 600 0.9rem var(--display); letter-spacing: 0.08em; text-transform: uppercase;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.ghost { border-color: transparent; background: none; color: var(--ink-2); }
.btn.icon { width: 36px; justify-content: center; padding: 6px 0; clip-path: none; }

main { max-width: 1320px; margin: 0 auto; padding: 22px 24px 60px; }
.intro { max-width: 780px; color: var(--ink-2); margin: 4px 0 16px; }
.prelim-tag { display: inline-block; padding: 0 7px; border: 1px solid var(--warn); color: var(--warn); font: 500 0.7rem var(--mono); text-transform: uppercase; letter-spacing: 0.1em; vertical-align: 2px; }
.status { color: var(--ink-3); font: 0.82rem var(--mono); min-height: 1.4em; text-transform: uppercase; letter-spacing: 0.06em; }
.status:not(:empty)::before { content: "▸ "; color: var(--accent); }
.status.error { color: var(--warn); }

/* ---------------------------------------------------------------- layout */
.layout { display: grid; gap: 18px; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); grid-template-areas: "forecast surface" "pricer surface"; align-items: start; }
#forecast-panel { grid-area: forecast; }
#surface-panel { grid-area: surface; }
#pricer-panel { grid-area: pricer; }
@media (max-width: 980px) {
  .layout { grid-template-columns: minmax(0, 1fr); grid-template-areas: "forecast" "surface" "pricer"; }
  .bar { padding: 10px 16px; }
  .tagline { display: none; }
  main { padding: 16px 16px 48px; }
}

/* chamfered panels: the edge colour shows through a 1px gap around the inner face */
.panel {
  position: relative; isolation: isolate; min-width: 0; padding: 16px 18px 14px; background: var(--edge);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}
.panel::before {
  content: ""; position: absolute; inset: 1px; z-index: -1; background: var(--surface);
  clip-path: polygon(calc(var(--cut) - 0.4px) 0, 100% 0, 100% calc(100% - var(--cut) + 0.4px), calc(100% - var(--cut) + 0.4px) 100%, 0 100%, 0 calc(var(--cut) - 0.4px));
}
/* HUD corner marks */
.panel::after {
  content: ""; position: absolute; top: 0; right: 0; width: 22px; height: 22px; pointer-events: none;
  border-top: 2px solid var(--accent); border-right: 2px solid var(--accent);
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.panel h2 { font-size: 1.12rem; margin: 0; display: flex; align-items: baseline; gap: 10px; }
.step { color: var(--accent); font: 500 0.8rem var(--mono); letter-spacing: 0.04em; }
.step::after { content: " //"; color: var(--ink-3); }
.hint { color: var(--ink-3); font-size: 0.82rem; }
h3.sub { font-size: 0.95rem; margin: 16px 0 4px; color: var(--ink-2); }

.seg { display: inline-flex; border: 1px solid var(--line); padding: 2px; background: var(--surface-2); }
.seg button { border: 0; background: none; padding: 3px 12px; cursor: pointer; font: 600 0.84rem var(--display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); }
.seg button:hover { color: var(--ink); }
.seg button[aria-selected="true"] { background: var(--accent); color: var(--on-accent); }

.chips { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 2px 0 8px; }
.chips-label { color: var(--ink-3); font: 0.76rem var(--mono); text-transform: uppercase; letter-spacing: 0.06em; margin-right: 2px; }
.chips button {
  border: 1px solid var(--line); background: var(--surface-2); padding: 3px 11px; cursor: pointer; font: 600 0.84rem var(--display);
  letter-spacing: 0.05em; color: var(--ink-2); clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}
.chips button:hover { border-color: var(--accent); color: var(--ink); }
.chips button[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
#real-controls label { display: inline-flex; flex-direction: column; gap: 2px; font: 0.74rem var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-3); margin: 0 10px 8px 0; }
select { padding: 5px 8px; border: 1px solid var(--line); background: var(--surface-2); min-width: 120px; font-family: var(--mono); font-size: 0.85rem; }
select:focus, button:focus-visible, input:focus-visible { outline: 1px solid var(--accent); outline-offset: 1px; }

figure { margin: 0; }
.density svg { width: 100%; height: auto; display: block; touch-action: none; user-select: none; -webkit-user-select: none; }
.density figcaption { color: var(--ink-3); font-size: 0.82rem; margin-top: 2px; }
svg text { font: 10.5px var(--mono); fill: var(--ink-3); }
svg .gridline { stroke: var(--grid); stroke-width: 1; }
svg .axisline { stroke: var(--axis); stroke-width: 1; }
svg .ref { stroke: var(--ref); stroke-width: 1.5; stroke-dasharray: 4 4; fill: none; }
svg .area { fill: var(--accent); fill-opacity: 0.14; }
svg .edge { stroke: var(--accent); stroke-width: 2; fill: none; stroke-linejoin: round; }
svg.drawing { cursor: crosshair; }

.slider-row { display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; align-items: center; gap: 10px; margin: 8px 0; font-size: 0.88rem; }
.slider-row label { color: var(--ink-2); font: 600 0.84rem var(--display); letter-spacing: 0.08em; text-transform: uppercase; }
.slider-row output { font: 0.82rem var(--mono); color: var(--ink); white-space: nowrap; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
@media (max-width: 600px) {
  .slider-row { grid-template-columns: 56px minmax(0, 1fr); row-gap: 2px; }
  .slider-row output { grid-column: 2; }
}

.warn { margin: 10px 0 0; padding: 8px 11px; border-left: 2px solid var(--warn); background: var(--warn-soft); color: var(--warn); font-size: 0.86rem; }
.fine { color: var(--ink-3); font-size: 0.8rem; margin: 8px 0 0; }

.surface-wrap, .smiles-wrap { position: relative; }
#surface { width: 100%; height: 400px; display: block; cursor: grab; touch-action: none; background: var(--surface-2); border: 1px solid var(--line); }
#surface.dragging { cursor: grabbing; }
@media (max-width: 600px) { #surface { height: 300px; } }
.values { margin: 12px 0 4px; }
#value-diff { width: 100%; height: auto; display: block; margin-top: 4px; }
.axes-note { color: var(--ink-3); font-size: 0.8rem; margin: 6px 0 0; }
.readout { font-size: 0.86rem; color: var(--ink-2); margin-top: 8px; min-height: 1.4em; }
.readout b { color: var(--ink); font-weight: 600; }
.smiles-wrap svg { width: 100%; height: auto; display: block; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; font: 0.76rem var(--mono); color: var(--ink-2); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { display: inline-block; width: 16px; height: 2px; }
.legend i.dash { height: 0; border-top: 2px dashed var(--ref); }

.tip {
  position: absolute; pointer-events: none; z-index: 3; background: var(--surface); border: 1px solid var(--line); border-left: 2px solid var(--accent);
  padding: 7px 10px; font: 0.78rem var(--mono); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35); white-space: nowrap; color: var(--ink-2);
}
.tip b { color: var(--ink); font-weight: 600; }
.tip .row { display: flex; align-items: center; gap: 7px; }
.tip i { display: inline-block; width: 10px; height: 2px; }

.quote { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; margin-top: 12px; }
.quote > div { display: flex; flex-direction: column; gap: 1px; }
.quote .k { color: var(--ink-3); font: 0.72rem var(--mono); text-transform: uppercase; letter-spacing: 0.06em; }
.quote b { font: 1.05rem var(--mono); color: var(--ink); }
.quote span:not(.k) { color: var(--ink-3); font-size: 0.8rem; }
.quote .big {
  grid-column: 1 / -1; padding: 10px 14px; background: var(--accent-soft); border-left: 3px solid var(--accent);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}
.quote .big b { font-size: 1.7rem; color: var(--accent); }

.about { max-width: 820px; margin-top: 40px; color: var(--ink-2); }
.about h2 { color: var(--ink); font-size: 1.2rem; }
.about h2::before { content: ""; display: inline-block; width: 18px; height: 2px; background: var(--accent); vertical-align: middle; margin-right: 10px; }
.prelim-note { padding: 9px 12px; border-left: 2px solid var(--warn); background: var(--warn-soft); }
.prelim-note b { color: var(--warn); }
.sign { margin-top: 28px; color: var(--ink-3); font: 0.8rem 'Noto Sans JP', var(--mono); letter-spacing: 0.2em; }
.sign span { font-weight: 700; }
.sign span { color: var(--accent); }