:root {
  --bg: #071019;
  --bg-alt: #0e1b2a;
  --panel: rgba(10, 22, 36, 0.78);
  --line: rgba(148, 194, 219, 0.18);
  --text: #edf4fb;
  --muted: #9eb0c2;
  --accent: #ffd54b;
  --accent-strong: #ffb938;
  --cyan: #54d6ff;
  --pink: #ff6f91;
  --green: #86f6a5;
  --danger: #ff7f6e;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  --radius: 28px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at top left, rgba(84, 214, 255, 0.18), transparent 30%),
    radial-gradient(circle at top right, rgba(255, 213, 75, 0.12), transparent 28%),
    linear-gradient(180deg, #050b12 0%, #09121d 48%, #0b1420 100%);
  color: var(--text);
  font-family: "Space Grotesk", sans-serif;
  overflow-x: hidden;
}

.backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at center, black 45%, transparent 100%);
  opacity: 0.55;
}

.shell {
  width: min(1440px, calc(100% - 32px));
  margin: 24px auto 48px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  padding: 28px;
}

.hero-copy {
  max-width: 780px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.76rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  font-family: "Bricolage Grotesque", sans-serif;
  line-height: 0.95;
  margin: 0;
}

h1 {
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  letter-spacing: -0.05em;
}

h2 {
  font-size: clamp(1.4rem, 2vw, 2.2rem);
  letter-spacing: -0.04em;
}

h3 {
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.hero-text,
.panel-subtitle,
.brief-card p,
.feature-card p,
.equation-note {
  color: var(--muted);
  line-height: 1.65;
}

.hero-text {
  margin: 18px 0 0;
  max-width: 760px;
  font-size: 1.05rem;
}

.hero-meta {
  display: grid;
  gap: 14px;
  min-width: 220px;
}

.deadline-card,
.status-badge {
  border-radius: 20px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 213, 75, 0.25);
  background: linear-gradient(180deg, rgba(255, 213, 75, 0.16), rgba(255, 213, 75, 0.06));
}

.deadline-card span,
.status-badge {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.74rem;
  color: rgba(255, 249, 234, 0.75);
}

.deadline-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.08rem;
}

.status-badge {
  color: var(--text);
  font-weight: 700;
}

.grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(320px, 0.78fr);
  gap: 22px;
  margin-top: 22px;
}

.control-panel,
.simulator-panel,
.equations-panel {
  padding: 24px;
}

.simulator-panel {
  grid-column: 1;
}

.control-panel {
  grid-column: 2;
}

.equations-panel {
  grid-column: 1 / 3;
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}

.panel-heading.compact {
  margin-bottom: 16px;
}

.equation-card,
.control-card {
  border-radius: 22px;
  padding: 18px;
  background: linear-gradient(180deg, rgba(16, 30, 47, 0.98), rgba(10, 21, 35, 0.94));
  border: 1px solid rgba(148, 194, 219, 0.12);
}

.equation-card h3 {
  margin-bottom: 10px;
}

.action-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

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

.chip-button {
  appearance: none;
  border: 1px solid rgba(84, 214, 255, 0.18);
  background: rgba(84, 214, 255, 0.08);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 999px;
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.chip-button:hover,
.chip-button.active {
  transform: translateY(-1px);
  background: rgba(255, 213, 75, 0.12);
  border-color: rgba(255, 213, 75, 0.28);
}

.hint-bar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 18px;
  background: rgba(7, 17, 28, 0.88);
  border: 1px solid rgba(148, 194, 219, 0.1);
  color: var(--muted);
  font-size: 0.92rem;
}

.primary-button,
.secondary-button {
  appearance: none;
  border: 0;
  cursor: pointer;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.primary-button {
  padding: 13px 22px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #241500;
  box-shadow: 0 10px 28px rgba(255, 185, 56, 0.28);
}

.secondary-button {
  padding: 12px 18px;
  background: rgba(84, 214, 255, 0.12);
  color: var(--text);
  border: 1px solid rgba(84, 214, 255, 0.2);
}

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

#radarCanvas {
  display: block;
  width: 100%;
  aspect-ratio: 960 / 620;
  border-radius: 24px;
  border: 1px solid rgba(84, 214, 255, 0.18);
  background:
    radial-gradient(circle at 50% 50%, rgba(84, 214, 255, 0.08), transparent 48%),
    linear-gradient(180deg, rgba(8, 17, 28, 0.98), rgba(5, 13, 22, 0.98));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  cursor: grab;
  touch-action: none;
}

.status-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.status-pill {
  border-radius: 20px;
  padding: 14px 16px;
  background: rgba(8, 20, 32, 0.84);
  border: 1px solid rgba(148, 194, 219, 0.12);
}

.status-pill span {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: rgba(237, 244, 251, 0.58);
  margin-bottom: 6px;
}

.status-pill strong {
  display: block;
  line-height: 1.45;
}

.status-pill.emphasis {
  background: linear-gradient(180deg, rgba(255, 213, 75, 0.12), rgba(255, 185, 56, 0.05));
}

.controls-grid {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.control-card {
  display: grid;
  gap: 10px;
}

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

.control-top h3 {
  font-size: 1rem;
}

.control-top span {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
}

.control-description {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.mini-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.mini-card {
  border-radius: 16px;
  padding: 12px 14px;
  background: rgba(255, 213, 75, 0.08);
  border: 1px solid rgba(255, 213, 75, 0.14);
  color: #fff3c0;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 700;
}

.slider-input {
  display: grid;
}

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

input[type="number"] {
  width: 100%;
  border-radius: 14px;
  border: 1px solid rgba(148, 194, 219, 0.18);
  background: rgba(6, 14, 24, 0.84);
  color: var(--text);
  font: inherit;
  padding: 10px 12px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

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

.equation-block {
  margin: 0 0 12px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(4, 11, 19, 0.92);
  border: 1px solid rgba(84, 214, 255, 0.12);
  font-family: "Bricolage Grotesque", sans-serif;
  font-size: 1rem;
  line-height: 1.55;
  min-height: 82px;
}

.equation-note {
  margin: 0;
}

strong {
  color: #fff8df;
}

@media (max-width: 1180px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .control-panel,
  .simulator-panel,
  .equations-panel {
    grid-column: auto;
  }

  .hint-bar,
  .status-strip,
  .equation-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .shell {
    width: min(100% - 20px, 1440px);
    margin-top: 10px;
  }

  .hero,
  .control-panel,
  .simulator-panel,
  .equations-panel {
    padding: 18px;
  }

  .hero {
    flex-direction: column;
  }

  .action-cluster,
  .preset-row,
  .hint-bar,
  .status-strip,
  .equation-grid {
    grid-template-columns: 1fr;
  }

  .hint-bar,
  .action-cluster {
    display: grid;
  }

  .mini-strip {
    grid-template-columns: 1fr;
  }

  .toggle-row {
    flex-direction: column;
    align-items: stretch;
  }

}