* {
  box-sizing: border-box;
}

:root {
  color-scheme: dark;
  --page-bg: #000000;
  --text-primary: #e0e0e0;
  --text-secondary: #c7c7c7;
  --text-muted: #a0a0a0;
  --text-emphasis: #e8e8e8;
  --white-10: rgba(255, 255, 255, 0.1);
  --white-15: rgba(255, 255, 255, 0.15);
  --white-20: rgba(255, 255, 255, 0.2);
  --white-30: rgba(255, 255, 255, 0.3);
  --white-40: rgba(255, 255, 255, 0.4);
  --accent: #6b8ca3;
  --accent-glow: rgba(107, 140, 163, 0.4);
  --inverse-text: #000000;
  --nav-bg: rgba(0, 0, 0, 0.8);
  --control-bg: rgba(0, 0, 0, 0.6);
  --panel-bg: rgba(28, 30, 33, 0.92);
  --panel-shadow-soft: 0 0 20px rgba(0, 0, 0, 0.3);
  --text-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
  --canvas-bg: rgba(0, 0, 0, 0.45);
}

:root[data-theme="day"] {
  color-scheme: light;
  --page-bg: #f3f1eb;
  --text-primary: #1f3039;
  --text-secondary: #40545f;
  --text-muted: #5b6870;
  --text-emphasis: #12242d;
  --white-10: rgba(22, 44, 55, 0.1);
  --white-15: rgba(22, 44, 55, 0.15);
  --white-20: rgba(22, 44, 55, 0.2);
  --white-30: rgba(22, 44, 55, 0.3);
  --white-40: rgba(22, 44, 55, 0.4);
  --accent: #3f6377;
  --accent-glow: rgba(63, 99, 119, 0.24);
  --inverse-text: #f8f7f2;
  --nav-bg: rgba(246, 245, 240, 0.88);
  --control-bg: rgba(255, 255, 255, 0.78);
  --panel-bg: rgba(255, 255, 255, 0.82);
  --panel-shadow-soft: 0 6px 20px rgba(48, 64, 72, 0.12);
  --text-shadow: 0 1px 16px rgba(255, 255, 255, 0.8);
  --canvas-bg: rgba(255, 255, 255, 0.55);
}

:root[data-theme="day"] #starfield {
  display: none;
}

body {
  margin: 0;
  font-family: "Space Mono", monospace;
  background-color: var(--page-bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

#starfield {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.navigation {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1.25rem;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--white-10);
}

.nav-brand {
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-emphasis);
}

.nav-tag {
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 1px;
}

.utility-control {
  margin-left: auto;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--white-20);
  border-radius: 999px;
  background: var(--control-bg);
  color: var(--text-primary);
  backdrop-filter: blur(8px);
  display: grid;
  place-items: center;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.utility-control:hover {
  border-color: var(--white-40);
  color: var(--accent);
}

.utility-control:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

main {
  position: relative;
  z-index: 1;
  max-width: 1360px;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 3rem;
}

.hero {
  text-align: center;
  margin-bottom: 1.5rem;
}

h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.25rem, 3.2vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--text-emphasis);
  text-shadow: var(--text-shadow);
}

h2 {
  margin: 0 0 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
}

/* Three-column first screen: controls | geometry | RV + light curve */
.layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 1rem;
  align-items: stretch;
  min-width: 0;
  margin-bottom: 1rem;
}

.layout > * {
  min-width: 0;
}

.side-plots {
  display: grid;
  grid-template-rows: 1fr 1fr;
  gap: 1rem;
  min-width: 0;
}

/* Panels: glassmorphism + decorative corner accents */
.controls,
.panel,
.summary {
  position: relative;
  background: var(--panel-bg);
  border: 1px solid var(--white-15);
  backdrop-filter: blur(8px);
  box-shadow: var(--panel-shadow-soft);
}

.controls::before,
.panel::before,
.summary::before,
.controls::after,
.panel::after,
.summary::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border: 2px solid var(--text-emphasis);
  opacity: 0.7;
  pointer-events: none;
}

.controls::before,
.panel::before,
.summary::before {
  top: -1px;
  left: -1px;
  border-right: none;
  border-bottom: none;
}

.controls::after,
.panel::after,
.summary::after {
  bottom: -1px;
  right: -1px;
  border-left: none;
  border-top: none;
}

.controls {
  padding: 8px;
}

fieldset {
  border: 1px solid var(--white-20);
  margin: 0 0 8px;
  padding: 6px;
  min-width: 0;
}

legend {
  padding: 0 5px;
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
}

label {
  display: grid;
  grid-template-columns: 1fr 78px;
  gap: 6px;
  align-items: center;
  margin: 4px 0;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

input {
  width: 100%;
  padding: 2px 5px;
  border: 1px solid var(--white-30);
  border-radius: 0;
  background: var(--control-bg);
  color: var(--text-emphasis);
  font: inherit;
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button {
  width: 100%;
  padding: 0.45rem 1rem;
  border: 1px solid var(--white-40);
  border-radius: 0;
  background: transparent;
  color: var(--text-primary);
  font: inherit;
  font-size: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  background: var(--text-emphasis);
  color: var(--inverse-text);
  box-shadow: 0 0 15px var(--accent-glow);
}

.panel {
  padding: 12px;
}

canvas {
  display: block;
  width: 100%;
  max-width: 100%;
  border: 1px solid var(--white-10);
  background: var(--canvas-bg);
}

.summary {
  display: grid;
  grid-template-columns: repeat(2, max-content 1fr);
  gap: 4px 14px;
  margin: 0;
  padding: 12px 16px;
  font-size: 0.75rem;
}

.summary dt {
  font-weight: 700;
  color: var(--accent);
}

.summary dd {
  margin: 0;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.footer {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  flex-wrap: wrap;
  padding: 0 1rem 1.25rem;
  font-size: 0.7rem;
  color: var(--text-muted);
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .side-plots {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: none;
  }

  .summary {
    grid-template-columns: max-content 1fr;
  }
}

@media (max-width: 700px) {
  main {
    padding: 1rem 0.75rem 2.5rem;
  }

  .side-plots {
    grid-template-columns: 1fr;
  }

  label {
    grid-template-columns: 1fr 96px;
  }
}