/* ===========================================================
   app.css — Graphing chrome
   =========================================================== */
@import url('colors_and_type.css');

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--ff-serif);
  color: var(--fg);
  background: var(--ac-paper);
  overflow: hidden;
}

/* shell */
.shell {
  display: grid;
  grid-template-rows: 56px 1fr;
  height: 100vh;
  width: 100vw;
}

/* ---- top utility bar ---- */
.topbar {
  background: var(--ac-blue);
  color: var(--ac-white);
  display: flex; align-items: center;
  padding: 0 20px;
  border-bottom: 1px solid var(--ac-blue-deep);
  user-select: none;
}
.topbar .brand {
  display: flex; align-items: center; gap: 14px;
}
.topbar .wordmark {
  display: flex; flex-direction: column; line-height: 1;
}
.topbar .wordmark .title {
  font-family: 'Filosofia', var(--ff-serif);
  font-variant: small-caps;
  letter-spacing: 0.18em;
  font-size: 18px;
  text-transform: lowercase;
}
.topbar .spacer { flex: 1; }
.topbar .actions { display: flex; gap: 4px; }
.topbar .btn {
  background: transparent;
  color: rgba(255,255,255,0.92);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-sm);
  height: 34px;
  padding: 0 12px;
  font-family: var(--ff-sans-cond);
  font-size: 11px;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
  transition: background var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.topbar .btn:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.32); }
.topbar .btn.primary { background: var(--ac-light-blue); color: var(--ac-blue-ink); border-color: var(--ac-light-blue); }
.topbar .btn.primary:hover { background: #b8dcf0; }
.topbar .btn svg { width: 14px; height: 14px; }

/* ---- main row ---- */
.main {
  display: grid;
  grid-template-columns: 360px 1fr;
  min-height: 0;
}

/* ---- sidebar ---- */
.sidebar {
  background: var(--ac-paper);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex; flex-direction: column;
}
.sidebar-head {
  padding: 14px 18px 10px;
  display: flex; align-items: baseline; justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.sidebar-head .eyebrow {
  font-family: var(--ff-sans-cond);
  font-size: 11px;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--ac-blue);
}
.sidebar-head .count {
  font-family: var(--ff-serif);
  font-style: italic;
  font-size: 13px;
  color: var(--fg-muted);
}

.fn-list { padding: 6px; display: flex; flex-direction: column; gap: 6px; flex: 1; }

.fn-card {
  border: 1px solid var(--border);
  background: var(--ac-white);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.fn-card:hover { border-color: var(--border-strong); }
.fn-card.error { border-color: rgba(179,38,30,0.5); background: #FDF5F4; }
.fn-card .row1 {
  display: grid;
  grid-template-columns: 28px 18px 1fr 28px;
  align-items: stretch;
  min-height: 44px;
}
.fn-card .row1 .num {
  font-family: var(--ff-serif);
  font-style: italic;
  font-size: 13px;
  color: var(--fg-muted);
  display: flex; align-items: center; justify-content: center;
  border-right: 1px solid var(--border);
}
.fn-card .row1 .swatch {
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.fn-card .row1 .swatch .dot {
  width: 11px; height: 11px; border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.08);
}
.fn-card .row1 .swatch.hidden .dot {
  background: transparent !important;
  border: 1.5px solid var(--ac-n-300) !important;
}
.fn-card .row1 .expr {
  border: 0; outline: 0; background: transparent;
  font-family: 'AGaramond', Georgia, serif;
  font-size: 19px;
  padding: 8px 10px 8px 12px;
  color: var(--fg);
  width: 100%;
  letter-spacing: 0.005em;
}
.fn-card .row1 .expr::placeholder { color: var(--fg-subtle); font-style: italic; }
.fn-card .row1 .more {
  background: transparent;
  border: 0;
  border-left: 1px solid var(--border);
  cursor: pointer;
  color: var(--fg-muted);
  font-family: var(--ff-sans-cond);
  font-size: 14px;
  letter-spacing: 0.1em;
}
.fn-card .row1 .more:hover { background: var(--ac-light-blue-wash); color: var(--ac-blue); }

/* MathQuill expression editor (replaces the plain .expr input) */
.fn-card .row1 .mq-cell {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  min-width: 0;
  padding: 6px 8px 6px 12px;
}
.fn-card .row1 .mq-cell .mq-field {
  width: 100%;
  font-size: 19px;
  color: var(--fg);
}
/* strip MathQuill's default chrome so it reads like the rest of the card */
.fn-card .row1 .mq-field.mq-editable-field,
.fn-card .row1 .mq-field .mq-editable-field { border: 0; }
.fn-card .row1 .mq-field.mq-editable-field.mq-focused,
.fn-card .row1 .mq-field .mq-editable-field.mq-focused {
  box-shadow: none; outline: none;
}
.fn-card .row1 .mq-cell.is-empty::before {
  content: 'y =';
  position: absolute;
  left: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--fg-subtle);
  font-style: italic;
  font-family: var(--ff-serif);
  font-size: 18px;
  pointer-events: none;
}

.fn-card .errmsg {
  font-family: var(--ff-serif);
  font-style: italic;
  font-size: 12px;
  color: var(--danger);
  padding: 6px 12px;
  border-top: 1px dashed rgba(179,38,30,0.3);
}

.fn-card .details {
  border-top: 1px solid var(--border);
  padding: 8px 12px 12px;
  display: grid;
  gap: 8px;
  background: linear-gradient(0deg, rgba(238,246,251,0.4), transparent 60%);
}
.fn-card .details .field {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 10px;
  align-items: center;
}
.fn-card .details .label {
  font-family: var(--ff-sans-cond);
  font-size: 10px;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--fg-muted);
}
.fn-card .details input[type=text] {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
  background: var(--ac-white);
  font-family: var(--ff-serif);
  font-size: 14px;
  color: var(--fg);
  outline: none;
}
.fn-card .details input[type=text]:focus {
  border-color: var(--ac-blue);
  box-shadow: var(--shadow-focus);
}
.fn-card .colors {
  display: flex; gap: 4px;
}
.fn-card .colors .c {
  width: 18px; height: 18px; border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.1);
  cursor: pointer;
  transition: transform var(--dur-fast);
}
.fn-card .colors .c:hover { transform: scale(1.15); }
.fn-card .colors .c.sel { box-shadow: 0 0 0 2px var(--ac-blue-ink); }

.fn-card .linestyles { display: flex; gap: 4px; }
.fn-card .linestyles .ls {
  width: 38px; height: 26px; padding: 0;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--ac-white); cursor: pointer; color: var(--fg-muted);
  display: flex; align-items: center; justify-content: center;
  transition: border-color var(--dur-fast), background var(--dur-fast);
}
.fn-card .linestyles .ls svg { width: 30px; height: 14px; }
.fn-card .linestyles .ls:hover { border-color: var(--border-strong); }
.fn-card .linestyles .ls.sel { border-color: var(--ac-blue); background: var(--ac-light-blue-wash); box-shadow: 0 0 0 1px var(--ac-blue); }
.fn-card .rangeRow { display: grid; grid-template-columns: 1fr 40px; align-items: center; gap: 8px; }
.fn-card .rangeRow input[type=range] { width: 100%; accent-color: var(--ac-blue); }
.fn-card .rangeRow .rv {
  font-family: var(--ff-serif); font-style: italic; font-size: 13px;
  color: var(--fg-muted); text-align: right;
}

.fn-card .toggle {
  display: inline-flex; align-items: center; gap: 8px;
  cursor: pointer; user-select: none;
}
.fn-card .toggle .switch {
  width: 28px; height: 16px; background: var(--ac-n-200); border-radius: 999px;
  position: relative; transition: background var(--dur-fast);
}
.fn-card .toggle .switch::after {
  content: ''; width: 12px; height: 12px; border-radius: 50%; background: white;
  position: absolute; top: 2px; left: 2px;
  transition: left var(--dur-fast) var(--ease-out);
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}
.fn-card .toggle.on .switch { background: var(--ac-blue); }
.fn-card .toggle.on .switch::after { left: 14px; }
.fn-card .toggle .lab {
  font-family: var(--ff-serif);
  font-size: 13px;
  color: var(--fg);
}

/* slider */
.slider-card {
  display: grid; grid-template-columns: 28px 1fr; align-items: center;
  padding: 10px 14px;
  background: var(--ac-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.slider-card .var {
  font-family: var(--ff-serif);
  font-style: italic;
  font-size: 18px;
  color: var(--ac-blue);
}
.slider-card .slider-play {
  background: transparent; border: 0; cursor: pointer;
  color: var(--ac-blue); font-size: 12px; line-height: 1; padding: 0;
  display: flex; align-items: center; justify-content: center;
  transition: color var(--dur-fast);
}
.slider-card .slider-play:hover { color: var(--ac-blue-deep); }
.slider-card .ctrl {
  display: grid; grid-template-columns: 1fr 80px; align-items: center; gap: 10px;
}
.slider-card input[type=range] { width: 100%; accent-color: var(--ac-blue); }
.slider-card .val {
  font-family: var(--ff-serif);
  font-style: italic;
  font-size: 14px;
  color: var(--fg);
  text-align: right;
}

/* add row */
.fn-add {
  padding: 8px 6px 14px;
  display: flex; gap: 6px;
  flex-wrap: wrap;
}
.fn-add button {
  flex: 1;
  background: transparent;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-family: var(--ff-sans-cond);
  font-size: 11px;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--fg-muted);
  cursor: pointer;
  transition: all var(--dur-fast);
}
.fn-add button:hover { border-color: var(--ac-blue); color: var(--ac-blue); background: var(--ac-light-blue-wash); }

/* ---- graph area ---- */
.graph {
  position: relative;
  background: var(--ac-white);
  overflow: hidden;
}
.graph canvas {
  display: block;
  width: 100%; height: 100%;
  cursor: crosshair;
  touch-action: none; /* let the canvas handle pinch / drag gestures itself */
}
.graph canvas.panning { cursor: grabbing; }
.graph canvas.dragging-label { cursor: grabbing; }

/* trace card */
.trace {
  position: absolute;
  padding: 10px 14px;
  background: rgba(255,255,255,0.97);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  pointer-events: none;
  min-width: 140px;
  transition: opacity var(--dur-fast);
}
.trace .eyebrow {
  font-family: var(--ff-sans-cond);
  font-size: 9px;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 2px;
}
.trace .label {
  font-family: var(--ff-serif);
  font-size: 13px;
  font-style: italic;
  color: var(--fg);
}
.trace .coords {
  font-family: var(--ff-serif);
  font-style: italic;
  font-size: 16px;
  color: var(--fg);
  margin-top: 4px;
}
.trace .coords .v { color: var(--ac-blue); font-weight: 600; }

/* zoom controls */
.zoom-ctl {
  position: absolute;
  bottom: 18px;
  right: 18px;
  display: flex; flex-direction: column;
  background: rgba(255,255,255,0.98);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.zoom-ctl button {
  background: transparent;
  border: 0;
  width: 38px; height: 36px;
  cursor: pointer;
  color: var(--ac-blue);
  font-size: 17px;
  font-family: var(--ff-serif);
  border-bottom: 1px solid var(--border);
  transition: background var(--dur-fast);
}
.zoom-ctl button:last-child { border-bottom: 0; }
.zoom-ctl button:hover { background: var(--ac-light-blue-wash); }

/* keyboard hint */
.kbd-hint {
  position: absolute;
  bottom: 18px;
  left: 18px;
  font-family: var(--ff-serif);
  font-style: italic;
  font-size: 12px;
  color: var(--fg-muted);
  background: rgba(255,255,255,0.85);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

/* ---- export dialog ---- */
.export-overlay {
  position: fixed; inset: 0; z-index: 3000;
  background: rgba(2, 26, 52, 0.45);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.export-modal {
  width: 460px; max-width: 100%;
  background: var(--ac-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex; flex-direction: column;
}
.export-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px;
  background: var(--ac-blue);
}
.export-head .eyebrow {
  font-family: var(--ff-sans-cond);
  font-size: 12px; letter-spacing: var(--tracking-widest);
  text-transform: uppercase; color: var(--ac-white);
}
.export-x {
  background: transparent; border: 0; cursor: pointer;
  color: rgba(255,255,255,0.8); font-size: 14px; line-height: 1; padding: 4px;
}
.export-x:hover { color: var(--ac-white); }
.export-preview {
  margin: 16px; height: 200px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--ac-light-blue-wash);
  background-image:
    linear-gradient(45deg, #eef2f6 25%, transparent 25%, transparent 75%, #eef2f6 75%),
    linear-gradient(45deg, #eef2f6 25%, transparent 25%, transparent 75%, #eef2f6 75%);
  background-size: 16px 16px; background-position: 0 0, 8px 8px;
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.export-preview img { max-width: 100%; max-height: 100%; object-fit: contain; box-shadow: var(--shadow-sm); }
.export-ph { font-family: var(--ff-serif); font-style: italic; color: var(--fg-muted); }
.export-controls { padding: 0 18px; display: flex; flex-direction: column; gap: 10px; }
.export-row { display: flex; gap: 12px; }
.export-field { display: flex; flex-direction: column; gap: 5px; }
.export-field.grow { flex: 1; }
.export-field label {
  font-family: var(--ff-sans-cond);
  font-size: 10px; letter-spacing: var(--tracking-widest);
  text-transform: uppercase; color: var(--fg-muted);
}
.export-num { display: flex; align-items: center; gap: 6px; }
.export-num input, .export-name {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 6px 8px; background: var(--ac-white);
  font-family: var(--ff-serif); font-size: 14px; color: var(--fg);
  outline: none; width: 92px;
}
.export-name { width: 100%; }
.export-num input:focus, .export-name:focus { border-color: var(--ac-blue); box-shadow: var(--shadow-focus); }
.export-num span { font-family: var(--ff-serif); font-style: italic; font-size: 13px; color: var(--fg-muted); }
.export-hint { font-family: var(--ff-serif); font-style: italic; font-size: 12px; color: var(--fg-muted); margin-top: -2px; }
.export-fmt { display: flex; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.export-fmt button {
  background: var(--ac-white); border: 0; border-left: 1px solid var(--border);
  padding: 6px 14px; cursor: pointer;
  font-family: var(--ff-sans-cond); font-size: 11px; letter-spacing: var(--tracking-wide);
  text-transform: uppercase; color: var(--fg-muted);
}
.export-fmt button:first-child { border-left: 0; }
.export-fmt button.on { background: var(--ac-blue); color: var(--ac-white); }
.export-fmt button:disabled { opacity: 0.4; cursor: not-allowed; }
.export-actions {
  display: flex; justify-content: flex-end; gap: 10px;
  padding: 16px 18px; margin-top: 4px;
}
.export-btn {
  height: 36px; padding: 0 18px; border-radius: var(--radius-sm); cursor: pointer;
  font-family: var(--ff-sans-cond); font-size: 11px; letter-spacing: var(--tracking-widest);
  text-transform: uppercase; border: 1px solid var(--border);
  transition: background var(--dur-fast), border-color var(--dur-fast);
}
.export-btn.ghost { background: transparent; color: var(--fg-muted); }
.export-btn.ghost:hover { border-color: var(--border-strong); color: var(--fg); }
.export-btn.primary { background: var(--ac-blue); color: var(--ac-white); border-color: var(--ac-blue); }
.export-btn.primary:hover { background: var(--ac-blue-deep); }
.export-btn.primary:disabled { opacity: 0.6; cursor: default; }

/* tweaks overrides (compact) */
.ac-tweaks-wrap { font-family: var(--ff-serif); }

/* hide ugly scrollbars in sidebar */
.sidebar::-webkit-scrollbar { width: 8px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--ac-n-200); border-radius: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }