/* === core/core.css | ЧАСТЬ 1 из 4 (Базовые переменные, сброс и типографика) === */
:root {
  --bg: #060b16;
  --surface: #0c1426;
  --surface-2: #111d36;
  --border: rgba(56, 189, 248, 0.16);
  --border-hover: rgba(16, 185, 129, 0.45);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #10b981;
  --accent-glow: rgba(16, 185, 129, 0.25);
  --accent2: #38bdf8;
  --warn: #f59e0b;
  --danger: #ef4444;
  --quantum: #a855f7;
  --radius: 14px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  background: radial-gradient(circle at 50% 0%, #0f1c38 0%, var(--bg) 65%);
  overflow-x: hidden;
  padding-bottom: 60px;
}

a {
  color: var(--accent2);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent);
}

.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 16px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 52px;
  background: rgba(6, 11, 22, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  white-space: nowrap;
}

.brand-badge {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 99px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent);
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: 9px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  transition: all 0.2s ease;
}
/* === core/core.css | ЧАСТЬ 3 из 4 (Стили кнопок, карточек и сетки симуляции) === */
.btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.btn-primary {
  background: var(--accent);
  color: #04130d;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: #34d399;
  color: #04130d;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.78rem;
}

.nav-pills {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 12px 0;
  scrollbar-width: none;
}

.nav-pills::-webkit-scrollbar {
  display: none;
}

.pill {
  padding: 6px 12px;
  border-radius: 99px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all 0.2s;
}

.pill:hover, .pill.active {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(16, 185, 129, 0.12);
}

.exp-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.exp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.exp-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 700;
}

.sim-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

@media (min-width: 820px) {
  .sim-layout {
    grid-template-columns: 1.35fr 1fr;
    align-items: start;
  }
}
/* === core/core.css | ЧАСТЬ 4 из 4 (Canvas, контролы, теория и модальное окно) === */
.canvas-box {
  position: relative;
  width: 100%;
  background: #040811;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: 360px;
}

.controls-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--surface-2);
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.control-label span.val {
  color: var(--accent2);
  font-family: var(--font-mono);
  font-weight: 600;
}

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

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.chip.active, .chip:hover {
  border-color: var(--accent2);
  color: var(--text);
  background: rgba(56, 189, 248, 0.14);
}

.science-details {
  margin-top: 16px;
  background: rgba(4, 8, 17, 0.55);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
}

.science-details summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent2);
  user-select: none;
}

.science-content {
  margin-top: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(2, 6, 14, 0.82);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-backdrop.open {
  display: flex;
}

.modal-card {
  width: 100%;
  max-width: 540px;
  background: var(--surface);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius);
  padding: 20px;
  max-height: 88vh;
  overflow-y: auto;
}