/*
 * 文件：css/style.css
 *
 * 这个文件只负责页面长什么样，不参与画分形。
 * 左边是参数面板，右边（窄屏时改到下面）是 WebGL 画布。
 * 画布里的垫片颜色由着色器决定，不由这里的 CSS 决定。
 */

:root {
  --ink: #1c1915;
  --muted: #6d655c;
  --line: #ddd4c6;
  --paper: #f3eee4;
  --panel: #faf7f1;
  --accent: #b8432f;
  --stage: #121417;
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "Noto Serif SC", serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--paper);
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  padding: 16px 22px 12px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--accent);
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
}

h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.topbar-note {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

main {
  flex: 1;
  display: flex;
  min-height: 0;
}

.panel {
  width: 340px;
  flex: none;
  overflow: auto;
  padding: 8px 18px 20px;
  background: var(--panel);
  border-right: 1px solid var(--line);
}

fieldset {
  margin: 14px 0 0;
  padding: 0;
  border: 0;
}

legend {
  padding: 0;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.formula {
  margin: 10px 0 0;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.5;
}

.mode-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-top: 8px;
}

.mode-row label,
.check-field,
.select-field,
.slider-field {
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  font-size: 14px;
}

.mode-row label,
.check-field {
  display: flex;
  align-items: center;
  gap: 6px;
}

.select-field,
.slider-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 12px;
}

.select-field span,
.slider-field span {
  display: flex;
  justify-content: space-between;
}

select, button, input[type="range"] {
  accent-color: var(--accent);
}

select, button {
  font: inherit;
  color: var(--ink);
  background: #fff;
  border: 1px solid #d9d0c3;
  border-radius: 6px;
  padding: 7px 8px;
}

button {
  width: 100%;
  margin-top: 12px;
  cursor: pointer;
  background: var(--ink);
  color: #f6f1e8;
  border-color: var(--ink);
}

button:hover { background: #3a332c; }

kbd {
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 11px;
  padding: 1px 4px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
}

.is-disabled {
  opacity: 0.45;
}

.status {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
}

.stage {
  position: relative;
  flex: 1;
  min-width: 0;
  background: var(--stage);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  cursor: grab;
}

canvas:active { cursor: grabbing; }

.hint {
  position: absolute;
  left: 16px;
  bottom: 14px;
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 13px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
  pointer-events: none;
}

@media (max-width: 800px) {
  main { flex-direction: column; }
  .panel { width: auto; max-height: 42vh; }
  .stage { min-height: 58vh; }
}