/* Generic Precession explorer: design tokens, layout and components.
   Dash loads every .css file in this folder automatically. */

/* ---------- Design tokens ---------- */
:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #f8f9fb;
  --border: #e3e7ed;
  --border-strong: #cfd5de;
  --text: #1d2433;
  --text-2: #3b4456;
  --muted: #5d6677;
  --accent: #2457d6;
  --accent-strong: #1b44ad;
  --accent-weak: #eaf0fd;
  --rp: #d97a1c;
  --j: #d93a2b;

  --warn-bg: #fff8eb;
  --warn-border: #f1d49a;
  --warn-text: #6d4500;
  --error-bg: #fdf0ef;
  --error-border: #f2c3bd;
  --error-text: #8a2117;

  --font: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.06);
  --focus: 0 0 0 3px rgba(36, 87, 214, 0.28);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  --header-h: 64px;
  --sidebar-w: 360px;
}

/* Dash 4 component theme (declared on :root by Dash at runtime; html:root wins on specificity). */
html:root {
  --Dash-Fill-Interactive-Strong: var(--accent);
  --Dash-Fill-Interactive-Weak: var(--accent-weak);
  --Dash-Fill-Disabled: #e3e7ee;
  --Dash-Fill-Primary-Hover: rgba(36, 87, 214, 0.06);
  --Dash-Fill-Primary-Active: rgba(36, 87, 214, 0.12);
  --Dash-Stroke-Strong: var(--border-strong);
  --Dash-Stroke-Weak: var(--border);
  --Dash-Text-Primary: var(--text);
  --Dash-Text-Strong: var(--text-2);
  --Dash-Text-Weak: var(--muted);
  --Dash-Text-Disabled: #8a93a3;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

:focus-visible { outline: none; box-shadow: var(--focus); border-radius: 4px; }

.muted { color: var(--muted); }

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -48px;
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}
.skip-link:focus { top: var(--space-2); }

/* ---------- Icons (inline SVG masks; color follows currentColor) ---------- */
.icon {
  display: inline-block;
  width: 16px;
  height: 16px;
  flex: none;
  background-color: currentColor;
  -webkit-mask: var(--icon) center / contain no-repeat;
  mask: var(--icon) center / contain no-repeat;
}
.icon-code { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='16 18 22 12 16 6'/%3E%3Cpolyline points='8 6 2 12 8 18'/%3E%3C/svg%3E"); }
.icon-user { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2'/%3E%3Ccircle cx='12' cy='7' r='4'/%3E%3C/svg%3E"); }
.icon-globe { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cline x1='2' y1='12' x2='22' y2='12'/%3E%3Cpath d='M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z'/%3E%3C/svg%3E"); }
.icon-download { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4'/%3E%3Cpolyline points='7 10 12 15 17 10'/%3E%3Cline x1='12' y1='15' x2='12' y2='3'/%3E%3C/svg%3E"); }

/* ---------- Header ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0 var(--space-5);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: var(--space-3); min-width: 0; }

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid var(--border);
}

.brand-title {
  margin: 0;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-tagline {
  margin: 2px 0 0;
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.top-links { display: flex; align-items: center; gap: var(--space-1); flex: none; }

.top-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-weight: 500;
  font-size: 13px;
  text-decoration: none;
}
.top-link:hover { background: var(--surface-2); color: var(--text); }

/* ---------- Workspace ---------- */
.workspace {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  align-items: start;
  gap: var(--space-5);
  max-width: 1760px;
  margin: 0 auto;
  padding: var(--space-5);
}

.section-title {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- Controls panel ---------- */
.controls {
  position: sticky;
  top: calc(var(--header-h) + var(--space-5));
  max-height: calc(100vh - var(--header-h) - 2 * var(--space-5));
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  scrollbar-width: thin;
}

.controls-head {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.group { border-bottom: 1px solid var(--border); }
.group:last-child { border-bottom: 0; }

.group-summary {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: var(--space-3) var(--space-4) var(--space-3) 36px;
  cursor: pointer;
  list-style: none;
  position: relative;
  user-select: none;
}
.group-summary::-webkit-details-marker { display: none; }
.group-summary::before {
  content: "";
  position: absolute;
  left: var(--space-4);
  top: 19px;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 0.15s ease;
}
.group[open] > .group-summary::before { transform: rotate(45deg); top: 17px; }
.group-summary:hover { background: var(--surface-2); }

.group-title { font-weight: 600; font-size: 14px; }
.group-desc { font-size: 12px; color: var(--muted); }

.group-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-1) var(--space-4) var(--space-4);
}

.control { display: flex; flex-direction: column; gap: 2px; }

.control-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
}

.control-label {
  display: flex;
  align-items: baseline;
  gap: 6px;
  min-width: 0;
  font-size: 13px;
  color: var(--text-2);
}

.sym {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  min-width: 28px;
}
.sym sub { font-size: 0.68em; font-style: normal; }

.control-name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.control-unit {
  font-size: 11.5px;
  color: var(--muted);
  padding: 0 5px;
  border: 1px solid var(--border);
  border-radius: 999px;
}

.control-value {
  flex: none;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent-strong);
  background: var(--accent-weak);
  padding: 1px 7px;
  border-radius: 6px;
  white-space: nowrap;
}

.control-hint { margin: 0; font-size: 11.5px; line-height: 1.4; color: var(--muted); }

/* Dash 4 slider refinements */
.slider .dash-slider-mark { font-size: 10.5px; font-family: var(--mono); }
.slider .dash-input-container { height: 30px; width: 68px; font-family: var(--mono); font-size: 12.5px; }
.slider .dash-slider-root.has-marks { padding-bottom: 24px; }

.presets { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.presets-label { width: 100%; font-size: 12px; color: var(--muted); }

.chip {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 5px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font: 500 12.5px/1.25 var(--font);
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}
.chip small { font-weight: 400; font-size: 10.5px; color: var(--muted); }
.chip { flex: 1 1 0; }
.chip:hover { border-color: var(--accent); background: var(--accent-weak); }

/* ---------- Buttons ---------- */
.button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font: 500 13px/1 var(--font);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.12s, background 0.12s;
}
.button:hover { border-color: var(--accent); color: var(--accent-strong); }
.button:active { background: var(--accent-weak); }
.button:disabled { opacity: 0.45; cursor: not-allowed; border-color: var(--border-strong); color: var(--muted); background: var(--surface); }
.button-ghost { border-color: transparent; color: var(--accent); }
.button-ghost:hover { background: var(--accent-weak); border-color: transparent; }

.link-button {
  align-self: flex-start;
  padding: 0;
  border: 0;
  background: none;
  color: var(--muted);
  font: 500 12px var(--font);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}
.link-button:hover { color: var(--accent); }

/* ---------- Results ---------- */
.results { display: flex; flex-direction: column; gap: var(--space-4); min-width: 0; }

/* System properties card: one row per quantity, label on the left, value on the right. */
.stats {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-2) var(--space-4) var(--space-3);
}

.stat {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas: "label value" "note value";
  align-items: center;
  column-gap: var(--space-4);
  flex: 1;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--border);
}
.stat:last-child { border-bottom: 0; }
.stat-label { grid-area: label; font-size: 13px; font-weight: 500; color: var(--text-2); }
.stat-note { grid-area: note; font-size: 11.5px; color: var(--muted); }
.stat > span:nth-child(2) { grid-area: value; text-align: right; white-space: nowrap; }
.stat-value {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat-unit { margin-left: 6px; font-size: 12.5px; color: var(--muted); }

.results-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.legend { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); }
.legend-item { display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px; color: var(--text-2); }

.key { display: inline-block; width: 22px; height: 0; flex: none; }
.key-gp { border-top: 2.5px solid var(--accent); }
.key-rp { border-top: 2px dashed var(--rp); }
.key-j { width: 10px; height: 10px; border-radius: 50%; background: var(--j); box-shadow: 0 0 0 1.5px #fff, 0 0 0 2.5px rgba(217, 58, 43, 0.25); }

.results-actions { display: flex; align-items: center; gap: var(--space-3); margin-left: auto; }

.status {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* Notices (validation, empty and error states) */
.notice {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-3) var(--space-4);
  border: 1px solid;
  border-radius: var(--radius);
}
.notice.is-empty { display: none; }
.notice p { margin: 2px 0 0; }
.notice-warn { background: var(--warn-bg); border-color: var(--warn-border); color: var(--warn-text); }
.notice-error { background: var(--error-bg); border-color: var(--error-border); color: var(--error-text); }
.notice-info { background: var(--accent-weak); border-color: #c9d7f7; color: #1e3a8a; }
.notice ul { margin: 4px 0 0; padding-left: 18px; }
.notice-icon {
  display: grid;
  place-items: center;
  flex: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  font-weight: 700;
  font-size: 13px;
}

/* Plot grid */
.plot-loading { position: relative; }

/* 2×2: modulation | system properties, then amplitude | phase. */
.plot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}


.plot-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.plot-head { padding: var(--space-3) var(--space-4) 0; }
.plot-title { margin: 0; font-size: 14px; font-weight: 600; }
.plot-subtitle { margin: 1px 0 0; font-size: 12px; color: var(--muted); }

.plot-frame { height: 380px; padding: 0 var(--space-2) var(--space-2); }

/* About */
.about {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.about > summary {
  padding: var(--space-3) var(--space-4);
  font-weight: 600;
  cursor: pointer;
}
.about-body { padding: 0 var(--space-4) var(--space-3); color: var(--text-2); max-width: 900px; }
.about-body p, .about-body ul { margin: 0 0 var(--space-3); }
.about-body li { margin-bottom: 4px; }

/* ---------- Footer ---------- */
.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  max-width: 1760px;
  margin: 0 auto;
  padding: var(--space-2) var(--space-5) var(--space-6);
  font-size: 12px;
  color: var(--text-2);
}

/* ---------- Responsive ---------- */
@media (max-width: 1179px) {
  :root { --sidebar-w: 320px; }
  .plot-grid { grid-template-columns: minmax(0, 1fr); }
  .plot-frame { height: 340px; }
}

@media (max-width: 879px) {
  .workspace { grid-template-columns: minmax(0, 1fr); padding: var(--space-4); gap: var(--space-4); }
  /* Results first on narrow screens, parameters below. */
  .results { order: 1; }
  .controls { order: 2; position: static; max-height: none; overflow: visible; }
  .controls-head { position: static; }
  .brand-tagline { display: none; }
  .top-link span { display: none; }
  .topbar { padding: 0 var(--space-4); }
  .footer { padding: var(--space-2) var(--space-4) var(--space-5); }
}

@media (max-width: 559px) {
  .stat-value { font-size: 19px; }
  .plot-frame { height: 310px; padding: 0; }
  .results-actions { width: 100%; justify-content: space-between; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}