linear-regression/styles.css

:root {
  --bg: #f4f1ea;
  --card: #fffef9;
  --ink: #18242d;
  --muted: #57646d;
  --accent: #dd5e2f;
  --accent-2: #0c7b73;
  --line: #d8d2c4;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: auto;
  min-height: 100%;
  overflow-y: scroll !important;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-gutter: stable both-edges;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Gill Sans", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 20% 10%, #fff6df, #f4f1ea 45%),
    linear-gradient(120deg, #f4f1ea, #ebf3ef);
  min-height: 100vh;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(rgba(12, 123, 115, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(12, 123, 115, 0.07) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
  z-index: -1;
}

.container {
  width: min(1050px, 92vw);
  margin: 0 auto;
  padding: 28px 0 50px;
}

.top-nav {
  margin-bottom: 12px;
}

.top-nav a {
  text-decoration: none;
  color: var(--accent-2);
  font-weight: 700;
}

.hero {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.hero.compact {
  padding: 22px 24px;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 1.8px;
  color: var(--accent);
  font-weight: 800;
  font-size: 12px;
}

h1 {
  margin: 10px 0 8px;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
}

h2 {
  margin-top: 0;
}

p {
  margin: 0;
  line-height: 1.6;
  color: var(--muted);
}

.cards {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
}

.card span {
  display: inline-block;
  margin-top: 14px;
  color: var(--accent-2);
  font-weight: 700;
}

.panel {
  margin-top: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}

label {
  font-weight: 700;
  min-width: 170px;
}

select,
input,
button {
  border-radius: 10px;
  border: 1px solid #c7c0b2;
  padding: 10px 12px;
  font-size: 0.96rem;
}

select,
input {
  background: #fff;
  flex: 1;
  min-width: 220px;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.15s ease;
}

button:hover {
  filter: brightness(0.94);
}

.operation-info {
  margin: 8px 0 14px;
  color: var(--muted);
  font-size: 0.95rem;
}

.shape-grid {
  display: grid;
  gap: 10px;
}

.shape-card {
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
}

.shape-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.shape-card input {
  width: 100%;
}

.options-card {
  background: #fffaf1;
}

.inline-fields {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.mini-label {
  min-width: 70px;
  font-weight: 700;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  min-width: 18px;
  flex: 0;
}

.code {
  margin: 0;
  padding: 14px;
  border-radius: 12px;
  background: #1c252e;
  color: #f3f0e6;
  overflow-x: auto;
  min-height: 120px;
}

.viz-grid {
  display: grid;
  gap: 14px;
}

.matrix-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: #fff;
}

.matrix-title {
  margin: 0 0 8px;
  font-weight: 700;
}

.shape-badge {
  display: inline-block;
  margin-left: 8px;
  color: #fff;
  background: var(--accent-2);
  border-radius: 999px;
  font-size: 0.8rem;
  padding: 2px 8px;
}

.matrix-table {
  border-collapse: collapse;
  width: max-content;
  max-width: 100%;
  margin-bottom: 10px;
}

.matrix-table td {
  border: 1px solid #ddd3c0;
  padding: 6px 9px;
  text-align: right;
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
  background: #fdfbf5;
}

.matrix-table th {
  border: 1px solid #ddd3c0;
  padding: 6px 9px;
  text-align: right;
  font-family: "Courier New", monospace;
  font-size: 0.86rem;
  background: #f6efdf;
}

.matrix-pick-btn {
  width: 100%;
  border: 1px solid #ddd3c0;
  border-radius: 6px;
  padding: 5px 7px;
  background: #fff;
  color: var(--ink);
  font-family: "Courier New", monospace;
  font-weight: 700;
}

.matrix-pick-btn.active {
  background: var(--accent-2);
  color: #fff;
  border-color: var(--accent-2);
}

.hl-row {
  background: #fff1dc !important;
}

.hl-col {
  background: #e7f7f4 !important;
}

.hl-cell {
  background: #ddeafc !important;
  font-weight: 800;
}

.slice-label {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 6px 0;
}

.formula-line {
  margin: 4px 0;
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
  color: #29333a;
}

.slider-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto auto;
  gap: 10px;
  align-items: center;
  margin: 8px 0 10px;
}

.slider-row label {
  min-width: 36px;
}

.error {
  color: #a11634;
  font-weight: 700;
}

.two-col-row {
  align-items: flex-end;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
}

.control-group {
  display: grid;
  gap: 6px;
}

.control-group label {
  min-width: 0;
}

.gd-slider-row {
  grid-template-columns: auto 1fr auto auto auto;
}

#fitCanvas,
#costCanvas {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.landscape-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin: 6px 0 12px;
}

.landscape-pill {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  background: #fff;
  font-size: 0.9rem;
  color: #24323a;
}

.landscape-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.viz-btn {
  padding: 8px 12px;
  border-radius: 9px;
  border: 1px solid #c7c0b2;
  background: #fff;
  color: #24323a;
}

.viz-btn:hover {
  border-color: var(--accent-2);
}

.landscape-controls.toggles {
  margin-bottom: 12px;
}

.viz-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  font-weight: 600;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  background: #fff;
}

.viz-toggle input {
  margin: 0;
}

.landscape-plot-wrap {
  width: min(100%, 980px);
  height: 620px;
  min-width: 320px;
  min-height: 320px;
  max-width: 1400px;
  max-height: 900px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  position: relative;
  contain: layout size paint;
  min-inline-size: 0;
  min-block-size: 0;
}

.landscape-plot {
  width: 100%;
  height: 100%;
  display: block;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
}

.landscape-plot-wrap:fullscreen {
  width: 100vw !important;
  height: 100vh !important;
  max-width: none;
  max-height: none;
  border-radius: 0;
  border-width: 0;
}

.log-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.gd-log-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 800px;
  font-family: "Courier New", monospace;
  font-size: 0.88rem;
}

.gd-log-table th,
.gd-log-table td {
  border-bottom: 1px solid #e6dfd2;
  padding: 8px 10px;
  text-align: left;
  white-space: nowrap;
}

.gd-log-table th {
  position: sticky;
  top: 0;
  background: #faf6eb;
  z-index: 1;
}

.active-log-row td {
  background: #eef8f6;
}

@media (max-width: 680px) {
  .container {
    width: 94vw;
    padding-top: 18px;
  }

  label {
    min-width: 100%;
  }

  .row {
    margin-bottom: 10px;
  }

  .slider-row {
    grid-template-columns: 1fr;
  }

  .slider-row label {
    min-width: 0;
  }

  .gd-slider-row {
    grid-template-columns: 1fr;
  }

  .landscape-plot-wrap {
    width: 100%;
    height: 420px;
    min-height: 280px;
  }
}