/* Doi milinewtoni pe metru - Stiluri canonice */
:root {
  --bg-deep: #050b14;
  --bg-surface: #0a1526;
  --bg-card: #0f1f38;
  --bg-card-hover: #142847;
  --border-subtle: #1e3a5f;
  --border-focus: #38bdf8;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #38bdf8;
  --accent-cyan-glow: rgba(56, 189, 248, 0.15);
  --accent-amber: #fbbf24;
  --accent-amber-glow: rgba(251, 191, 36, 0.15);
  --accent-rose: #f43f5e;
  --accent-emerald: #10b981;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --max-w: 820px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.site-header {
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(10, 21, 38, 0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-link {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, var(--accent-cyan), var(--bg-deep));
  border: 1px solid var(--accent-cyan);
}

.nav-links {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.lang-switch, .catalog-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}

.lang-switch:hover, .catalog-link:hover, .lang-switch:focus, .catalog-link:focus {
  color: var(--text-primary);
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-glow);
}

.lang-switch.active {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-glow);
}

.main-content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  flex: 1;
}

.hero-section {
  margin-bottom: 3rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  background: var(--accent-amber-glow);
  border: 1px solid var(--accent-amber);
  color: var(--accent-amber);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.25rem;
}

h1 {
  font-size: clamp(1.85rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.deck-lead {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  border-left: 3px solid var(--accent-cyan);
  padding-left: 1rem;
}

.key-metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.metric-value {
  font-size: 1.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  margin-bottom: 0.25rem;
}

.metric-value.amber {
  color: var(--accent-amber);
}

.metric-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.editorial-block {
  margin: 3rem 0;
}

h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

h2::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

strong {
  color: var(--text-primary);
}

em {
  color: var(--accent-amber);
  font-style: normal;
  font-weight: 500;
}

.interactive-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 2rem 0;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.panel-header {
  margin-bottom: 1.25rem;
}

.panel-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.panel-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.canvas-wrapper {
  background: #030712;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  margin-bottom: 1.25rem;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
}

.toggle-group, .slider-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.control-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.btn {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:hover, .btn:focus {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-glow);
}

.btn-primary {
  background: var(--accent-cyan);
  color: var(--bg-deep);
  border-color: var(--accent-cyan);
}

.btn-primary:hover, .btn-primary:focus {
  background: #7dd3fc;
  border-color: #7dd3fc;
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.input-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-field label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.input-field input, .input-field select {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 0.5rem 0.75rem;
  font-size: 0.95rem;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color 0.2s;
}

.input-field input:focus, .input-field select:focus {
  border-color: var(--accent-cyan);
}

.calc-results-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1.25rem;
}

.result-item-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.result-item-val {
  font-size: 1.4rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.result-item-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.35;
}

.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

th, td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

th {
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
}

td {
  color: var(--text-secondary);
}

tr:last-child td {
  border-bottom: none;
}

.formula-card {
  background: var(--bg-card);
  border-left: 3px solid var(--accent-amber);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-primary);
}

.sources-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sources-list li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding-left: 1.25rem;
  position: relative;
}

.sources-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

.sources-list a {
  color: var(--accent-cyan);
  text-decoration: none;
  word-break: break-all;
}

.sources-list a:hover, .sources-list a:focus {
  text-decoration: underline;
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  padding: 2rem 1.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-container {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.footer-container a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-container a:hover, .footer-container a:focus {
  color: var(--text-primary);
}

@media (max-width: 640px) {
  .main-content {
    padding: 1.5rem 1rem 3rem;
  }
  .controls-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .metric-card {
    padding: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

.mb-md {
  margin-bottom: 1.25rem;
}

.not-found-main {
  text-align: center;
  padding: 4rem 1rem;
}

.not-found-title {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.not-found-desc {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0.75rem 0.75rem;
  }
  .main-content {
    padding: 1.25rem 0.75rem 2.5rem;
  }
  .interactive-panel {
    padding: 1rem 0.75rem;
  }
  .btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
  }
  .status-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
  }
}