:root {
  --bg: #10212b;
  --bg-soft: #173242;
  --panel: rgba(13, 29, 37, 0.84);
  --panel-border: rgba(247, 243, 232, 0.1);
  --text: #777320;
  --muted: #c3d0d8;
  --accent: #f28f3b;
  --accent-2: #2a7f62;
  --danger: #ff6b6b;
  --shadow: 0 24px 60px rgba(4, 10, 14, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Source Sans 3", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(242, 143, 59, 0.18), transparent 30%),
    radial-gradient(circle at top right, rgba(42, 127, 98, 0.18), transparent 26%),
    linear-gradient(135deg, #09141c 0%, #10212b 55%, #163445 100%);
}

button,
input,
select {
  font: inherit;
}

.page-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 40px;
}

.hero {
  padding: 24px 28px 10px;
}

.eyebrow,
h1,
h2,
.experiment-card span {
  font-family: "Space Grotesk", sans-serif;
}

.eyebrow {
  margin: 0 0 8px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-size: 0.8rem;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  line-height: 0.95;
}

.hero-copy {
  max-width: 700px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 1.1rem;
}

.dashboard {
  display: grid;
  gap: 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.selector-panel,
.explanation-panel {
  padding: 24px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 20px;
}

.controls-panel,
.results-panel {
  padding: 24px;
}

.experiment-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.experiment-card {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid rgba(247, 243, 232, 0.12);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.experiment-card:hover,
.experiment-card.active {
  transform: translateY(-2px);
  border-color: rgba(242, 143, 59, 0.65);
  background: rgba(242, 143, 59, 0.12);
}

.experiment-card small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
}

.input-group {
  display: block;
  margin-bottom: 20px;
}

.input-row,
.button-row,
.explanation-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

input[type="range"] {
  width: 100%;
  margin-top: 10px;
  accent-color: var(--accent);
}

select {
  width: 100%;
  margin-top: 10px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(247, 243, 232, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.primary-button,
.secondary-button {
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.primary-button {
  background: var(--accent);
  color: #1f1207;
  font-weight: 700;
}

.secondary-button {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
}

.primary-button:disabled,
.secondary-button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.placeholder,
.explanation-panel p {
  color: var(--muted);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.result-card {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(247, 243, 232, 0.08);
}

.result-card span {
  display: block;
  color: var(--muted);
  margin-bottom: 8px;
}

.result-card strong {
  font-size: 1.35rem;
}

.spotlight strong {
  font-size: 2.4rem;
}

.chart-wrap {
  height: 320px;
  margin-top: 22px;
}

.error-box {
  margin: 16px 0;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 107, 107, 0.14);
  border: 1px solid rgba(255, 107, 107, 0.32);
  color: #ffdede;
}

.explanation-box {
  margin: 16px 0 0;
  padding: 20px;
  min-height: 180px;
  white-space: pre-wrap;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(247, 243, 232, 0.08);
  color: var(--text);
  font-family: "Source Sans 3", sans-serif;
}

@media (max-width: 900px) {
  .workspace,
  .experiment-grid {
    grid-template-columns: 1fr;
  }

  .explanation-header,
  .button-row {
    flex-direction: column;
    align-items: stretch;
  }
}