:root {
  --ink: #eef5ff;
  --muted: #9aa8bd;
  --paper: #070a12;
  --panel: #101521;
  --panel-strong: #0c111c;
  --line: #293241;
  --teal: #2dd4bf;
  --teal-soft: #0e3538;
  --amber: #fbbf24;
  --amber-soft: #f59e0b;
  --violet: #a78bfa;
  --blue: #38bdf8;
  --sym-blazhko-period: #fbbf24;
  --sym-blazhko-amp: #2dd4bf;
  --sym-blazhko-phase: #a78bfa;
  --sym-blazhko-mean: #fb7185;
  --sym-blazhko-offset: #60a5fa;
  --sym-orb-period: #38bdf8;
  --sym-periastron: #fb923c;
  --sym-eccentricity: #a3e635;
  --sym-omega: #c084fc;
  --sym-asini: #fcd34d;
  --slider-track: #2a3344;
  --slider-fill: #fbbf24;
  --shadow: 0 18px 58px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  scrollbar-gutter: stable;
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-y: scroll;
  color: var(--ink);
  background:
    linear-gradient(180deg, #060914 0%, #0a0f1b 48%, #070a12 100%);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
  color-scheme: dark;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(280px, 330px) minmax(0, 1fr);
  min-height: 100vh;
}

.side-menu {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  scrollbar-gutter: stable;
  padding: 22px 18px;
  border-right: 1px solid var(--line);
  background: rgba(10, 15, 27, 0.96);
}

.brand {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  align-items: center;
  margin-bottom: 20px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 62% 36%, #fbbf24 0 16%, transparent 17%),
    linear-gradient(135deg, var(--teal), var(--blue));
  box-shadow:
    0 0 18px rgba(45, 212, 191, 0.22),
    inset 0 0 0 1px rgba(238, 245, 255, 0.28);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 1.08rem;
  line-height: 1.15;
}

h2 {
  font-size: 1.28rem;
  line-height: 1.2;
}

.brand p,
.topbar p {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.45;
  margin-top: 3px;
}

.control-group {
  padding: 15px 0 17px;
  border-top: 1px solid var(--line);
}

.observation-controls {
  border-top: none;
  padding-top: 2px;
}

.add-effects {
  display: grid;
  gap: 9px;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 0.94rem;
  font-weight: 710;
}

.radio-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.radio-grid label {
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 30px;
  color: var(--muted);
  font-size: 0.83rem;
  font-weight: 650;
}

.radio-grid input {
  accent-color: var(--amber);
}

.effect-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  font-weight: 710;
  font-size: 0.94rem;
}

.check-row span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.check-row input {
  width: 17px;
  height: 17px;
  margin: 0;
  display: grid;
  place-content: center;
  appearance: none;
  border: 1px solid #6d7686;
  border-radius: 4px;
  background: #111827;
  cursor: pointer;
}

.check-row input::before {
  content: "";
  width: 9px;
  height: 5px;
  border-left: 2px solid #111827;
  border-bottom: 2px solid #111827;
  transform: rotate(-45deg) scale(0);
  transition: transform 80ms ease-out;
}

.check-row input:checked {
  border-color: #ffe8a3;
  background: var(--amber);
}

.check-row input:checked::before {
  transform: rotate(-45deg) scale(1);
}

.check-row input:focus-visible {
  outline: 2px solid rgba(251, 191, 36, 0.52);
  outline-offset: 3px;
}

.slider-stack {
  display: grid;
  gap: 13px;
  margin-top: 14px;
}

.slider-stack.is-disabled {
  opacity: 0.42;
}

.slider-stack label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  text-transform: uppercase;
}

.slider-stack label > span {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.parameter-name {
  display: flex;
  align-items: baseline;
  flex: 1 1 auto;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 0;
  line-height: 1.24;
}

.param-symbol {
  padding: 1px 5px 2px;
  border-radius: 5px;
  border: 1px solid currentColor;
  background: color-mix(in srgb, currentColor 12%, transparent);
  color: var(--symbol-color);
  font-family: "Cambria Math", "STIX Two Math", Georgia, serif;
  font-size: 0.86em;
  font-weight: 760;
  line-height: 1.1;
  text-transform: none;
  white-space: nowrap;
}

.param-symbol sub {
  font-size: 0.72em;
}

.symbol-blazhko-period {
  --symbol-color: var(--sym-blazhko-period);
}

.symbol-blazhko-amp {
  --symbol-color: var(--sym-blazhko-amp);
}

.symbol-blazhko-phase {
  --symbol-color: var(--sym-blazhko-phase);
}

.symbol-blazhko-mean {
  --symbol-color: var(--sym-blazhko-mean);
}

.symbol-blazhko-offset {
  --symbol-color: var(--sym-blazhko-offset);
}

.symbol-orb-period {
  --symbol-color: var(--sym-orb-period);
}

.symbol-periastron {
  --symbol-color: var(--sym-periastron);
}

.symbol-eccentricity {
  --symbol-color: var(--sym-eccentricity);
}

.symbol-omega {
  --symbol-color: var(--sym-omega);
}

.symbol-asini {
  --symbol-color: var(--sym-asini);
}

.mjx-symbol-blazhko-period {
  color: var(--sym-blazhko-period);
}

.mjx-symbol-blazhko-amp {
  color: var(--sym-blazhko-amp);
}

.mjx-symbol-blazhko-phase {
  color: var(--sym-blazhko-phase);
}

.mjx-symbol-blazhko-mean {
  color: var(--sym-blazhko-mean);
}

.mjx-symbol-blazhko-offset {
  color: var(--sym-blazhko-offset);
}

.mjx-symbol-orb-period {
  color: var(--sym-orb-period);
}

.mjx-symbol-periastron {
  color: var(--sym-periastron);
}

.mjx-symbol-eccentricity {
  color: var(--sym-eccentricity);
}

.mjx-symbol-omega {
  color: var(--sym-omega);
}

.mjx-symbol-asini {
  color: var(--sym-asini);
}

.mjx-equation-label {
  color: #64748b;
}

output {
  flex: 0 0 auto;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  text-transform: none;
}

input[type="range"] {
  width: 100%;
  height: 18px;
  appearance: none;
  background: transparent;
  accent-color: var(--slider-fill);
  cursor: pointer;
  --slider-progress: 0%;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 5px;
  border: 1px solid rgba(238, 245, 255, 0.12);
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    var(--slider-fill) 0 var(--slider-progress),
    var(--slider-track) var(--slider-progress) 100%
  );
}

input[type="range"]::-webkit-slider-thumb {
  width: 16px;
  height: 16px;
  margin-top: -6.5px;
  appearance: none;
  border: 1px solid #f8d56b;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: none;
}

input[type="range"]::-moz-range-track {
  height: 5px;
  border: 1px solid rgba(238, 245, 255, 0.12);
  border-radius: 999px;
  background: var(--slider-track);
}

input[type="range"]::-moz-range-progress {
  height: 5px;
  border-radius: 999px;
  background: var(--slider-fill);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 1px solid #f8d56b;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: none;
}

input[type="range"]:focus-visible {
  outline: 2px solid rgba(251, 191, 36, 0.52);
  outline-offset: 4px;
}

input[type="range"]:disabled {
  cursor: default;
  --slider-fill: #4e5a6b;
  --slider-track: #222a37;
}

input[type="range"]:disabled::-webkit-slider-thumb {
  border-color: #5e6878;
  background: #4e5a6b;
}

input[type="range"]:disabled::-moz-range-thumb {
  border-color: #5e6878;
  background: #4e5a6b;
}

.workspace {
  min-width: 0;
  padding: 18px 22px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  margin-bottom: 18px;
}

.action-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

button {
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid rgba(45, 212, 191, 0.36);
  border-radius: 7px;
  color: #d8fffa;
  background: var(--teal-soft);
  cursor: pointer;
}

button:hover {
  border-color: var(--teal);
  background: #12484c;
}

button:disabled {
  border-color: #344054;
  color: #78869b;
  background: #131a27;
  cursor: default;
}

.reset-effect {
  min-height: 28px;
  padding: 0 10px;
  border-color: rgba(148, 163, 184, 0.34);
  color: #d7e3f4;
  background: rgba(148, 163, 184, 0.08);
  font-size: 0.74rem;
  font-weight: 720;
}

.reset-effect:hover {
  border-color: rgba(251, 191, 36, 0.58);
  color: #ffe8a3;
  background: rgba(251, 191, 36, 0.12);
}

.add-effects button {
  border-color: rgba(251, 191, 36, 0.58);
  color: #ffe8a3;
  background: rgba(251, 191, 36, 0.11);
}

.add-effects button:hover {
  border-color: #fbbf24;
  background: rgba(251, 191, 36, 0.18);
}

.add-effects button:nth-child(2) {
  border-color: rgba(56, 189, 248, 0.52);
  color: #c8f2ff;
  background: rgba(56, 189, 248, 0.10);
}

.add-effects button:nth-child(2):hover {
  border-color: #38bdf8;
  background: rgba(56, 189, 248, 0.17);
}

.add-effects button:disabled {
  border-color: #344054;
  color: #78869b;
  background: #131a27;
}

.plot-panel {
  width: 100%;
  margin-bottom: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(19, 27, 43, 0.96), rgba(13, 18, 30, 0.98));
  box-shadow: var(--shadow);
}

.top-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 12px;
  margin-bottom: 12px;
}

.top-grid .plot-panel {
  margin-bottom: 0;
}

.stacked-panel {
  display: grid;
  gap: 10px;
}

.stacked-panel.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.ltte-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
  gap: 12px;
  margin-bottom: 12px;
}

.ltte-grid .plot-panel {
  margin-bottom: 0;
}

.math-panel {
  margin-top: 12px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(15, 23, 38, 0.98), rgba(10, 15, 27, 0.98));
  box-shadow: var(--shadow);
}

.math-panel h3,
.math-panel h4 {
  margin: 0;
}

.math-panel h3 {
  color: var(--ink);
  font-size: 1.08rem;
  line-height: 1.2;
}

.math-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 0;
}

.math-grid article {
  min-width: 0;
  padding: 12px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 8px;
  background: rgba(7, 10, 18, 0.46);
}

.math-grid h4 {
  color: #ffe8a3;
  font-size: 0.9rem;
  line-height: 1.25;
}

.math-grid p {
  margin-top: 7px;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.45;
}

.math-grid .math-attribution {
  color: #b8c6d8;
  font-size: 0.8rem;
}

.math-attribution a {
  color: #60d4ff;
  text-decoration-color: rgba(96, 212, 255, 0.46);
  text-underline-offset: 3px;
}

.math-attribution a:hover {
  color: #ffe08a;
  text-decoration-color: rgba(255, 224, 138, 0.7);
}

.math-equation {
  overflow-x: hidden;
  overflow-y: hidden;
  margin: 10px 0 0;
  padding: 13px 9px;
  border-radius: 7px;
  color: #dbeafe;
  background: #070b13;
  font-family: "Cambria Math", "STIX Two Math", "Latin Modern Math", "Times New Roman", serif;
  font-size: 0.94rem;
  line-height: 1.45;
}

.math-equation mjx-container[jax="CHTML"][display="true"] {
  margin: 0;
  overflow: visible;
}

.math-equation mjx-container[jax="CHTML"] {
  font-family: "Cambria Math", "STIX Two Math", "Latin Modern Math", "Times New Roman", serif;
}

canvas {
  display: block;
  width: 100%;
  height: 225px;
}

.primary-panel canvas {
  height: 275px;
}

.compact-panel canvas {
  height: 215px;
}

.observed-panel canvas {
  height: 225px;
}

.stacked-panel canvas {
  height: 215px;
}

.ltte-phase-panel canvas {
  height: 215px;
}

.is-hidden {
  display: none;
}

@media (max-width: 920px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .side-menu {
    position: relative;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .workspace {
    padding: 14px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .action-row {
    justify-content: flex-start;
  }

  .stacked-panel.two-up,
  .top-grid,
  .ltte-grid,
  .math-grid {
    grid-template-columns: 1fr;
  }

  canvas,
  .stacked-panel canvas {
    height: 210px;
  }

  .primary-panel canvas {
    height: 240px;
  }
}