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

:root {
  --bg:          #000000;
  --bg-card:     #1d1d1f;
  --bg-lift:     #161617;
  --accent:      #2997ff;
  --accent2:     #64d2ff;
  --text:        #f5f5f7;
  --muted:       #86868b;
  --border:      rgba(255,255,255,0.08);
  --glow:        rgba(41,151,255,0.2);
  --radius:      18px;
  --radius-sm:   12px;
  --ok:          #30d158;
  --warn:        #f5a623;
  --fail:        #ff453a;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── NAV ─── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: 'Space Grotesk', -apple-system, sans-serif;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo span { color: var(--accent); }

.nav-logo svg {
  color: var(--accent);
  filter: drop-shadow(0 0 6px rgba(41,151,255,0.3));
}

.nav-tabs {
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,0.05);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.3s, background 0.3s;
}

.nav-tab:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
}

.nav-tab.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 12px rgba(41,151,255,0.3);
}

/* ─── PANELS ─── */
.panel {
  display: none;
  padding: 7rem clamp(1.5rem, 5vw, 4rem) 4rem;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
  flex: 1;
  animation: fadeIn 0.3s cubic-bezier(0.2, 0.6, 0.2, 1);
}

.panel.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.panel-header {
  margin-bottom: 3.5rem;
}

.panel-header h1 {
  font-family: 'Space Grotesk', -apple-system, sans-serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.subtitle {
  color: var(--muted);
  font-size: 0.875rem;
  margin-top: 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.02em;
}

/* ─── SECTION LABEL ─── */
.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  padding-bottom: 0;
  border-bottom: none;
  display: block;
}

/* ─── GRID ─── */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .grid-2col { grid-template-columns: 1fr; }
}

/* ─── CARDS ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, rgba(255,255,255,0.03), transparent 60%);
  pointer-events: none;
}

.card:hover {
  border-color: rgba(255,255,255,0.15);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Space Grotesk', -apple-system, sans-serif;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
  color: var(--accent2);
}

.card-title svg { opacity: 0.7; }

/* ─── FORM ─── */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-group label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-group input,
.form-group select {
  padding: 0.625rem 0.875rem;
  background: rgba(0,0,0,0.4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: border-color 0.3s, box-shadow 0.3s;
  outline: none;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(41,151,255,0.12);
}

.form-group input:hover,
.form-group select:hover {
  border-color: rgba(255,255,255,0.15);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%2386868b' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* ─── BUTTONS ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.875rem 2rem;
  border: none;
  border-radius: 980px;
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.3s, transform 0.3s cubic-bezier(0.2, 0.6, 0.2, 1), box-shadow 0.3s;
  will-change: transform;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(41,151,255,0.25);
}

.btn-primary:hover {
  background: #0077ed;
  box-shadow: 0 8px 30px rgba(41,151,255,0.35);
  transform: translateY(-1px);
}

.btn-primary:active { transform: translateY(0); }

/* ─── RESULTS ─── */
.results-card { min-height: 400px; }

.results-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 200px;
  color: var(--muted);
  font-size: 0.875rem;
  opacity: 0.5;
}

.error-msg {
  padding: 1rem;
  background: rgba(255,69,58,0.1);
  border: 1px solid rgba(255,69,58,0.2);
  border-radius: var(--radius-sm);
  color: var(--fail);
  font-size: 0.875rem;
}

.result-section {
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.result-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.result-section h3 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-bottom: 0.875rem;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.625rem 0.875rem;
  background: rgba(0,0,0,0.3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.result-item.accent-item {
  border-color: rgba(41,151,255,0.25);
  background: rgba(41,151,255,0.05);
}

.result-label {
  font-size: 0.75rem;
  color: var(--muted);
}

.result-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.result-value.accent { color: var(--accent); }
.result-value.ok { color: var(--ok); }
.result-value.warn { color: var(--warn); }
.result-value.fail { color: var(--fail); }

/* ─── RESULT TABLE ─── */
.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.result-table th {
  padding: 0.625rem 0.875rem;
  text-align: left;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.result-table td {
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}

.result-table tr:last-child td { border-bottom: 0; }
.result-table tr:hover td { background: rgba(255,255,255,0.02); }
.result-table .ok { color: var(--ok); font-weight: 600; }
.result-table .fail { color: var(--fail); font-weight: 600; }

/* ─── HIGHLIGHT SECTION ─── */
.highlight-section {
  background: rgba(41,151,255,0.05);
  border: 1px solid rgba(41,151,255,0.15);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin-top: 0.25rem;
}

/* ─── DESIGN SUMMARY ─── */
.design-summary {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.summary-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ok);
}

.summary-item svg { flex-shrink: 0; }

/* ─── DEV BANNER ─── */
.dev-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: rgba(245,166,35,0.08);
  border: 1px solid rgba(245,166,35,0.2);
  border-radius: var(--radius-sm);
  margin-bottom: 2rem;
  color: var(--warn);
}

.dev-banner svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.dev-banner strong {
  font-family: 'Space Grotesk', -apple-system, sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  display: block;
  margin-bottom: 0.125rem;
}

.dev-banner p {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ─── SCROLLBAR ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ─── FOOTER ─── */
.lab-footer {
  padding: 1.5rem clamp(1.5rem, 5vw, 4rem);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.lab-footer p {
  font-size: 0.75rem;
  color: var(--muted);
}

.lab-footer a {
  color: var(--accent);
  text-decoration: none;
}

.lab-footer a:hover { color: var(--accent2); }

.footer-logo {
  font-family: 'Space Grotesk', -apple-system, sans-serif;
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.footer-logo span { color: var(--accent); }

/* ─── MODULE GRID (Landing Page) ─── */
.module-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.module-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2.5rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

.module-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, rgba(255,255,255,0.03), transparent 60%);
  pointer-events: none;
  border-radius: var(--radius);
}

.module-card:hover {
  border-color: var(--accent);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 40px rgba(41,151,255,0.1);
  transform: translateY(-4px);
}

.module-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(41,151,255,0.08);
  border-radius: 20px;
  margin-bottom: 1.25rem;
  color: var(--accent);
}

.module-card h2 {
  font-family: 'Space Grotesk', -apple-system, sans-serif;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.module-card p {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.module-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.module-link svg {
  transition: transform 0.3s;
}

.module-card:hover .module-link svg {
  transform: translateX(4px);
}

@media (max-width: 768px) {
  .module-grid {
    grid-template-columns: 1fr;
  }
}

/* ─── REDUCED MOTION ─── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ─── MOBILE ─── */
@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    height: auto;
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }

  .panel { padding: 4rem 1rem 2rem; }

  .form-grid,
  .result-grid { grid-template-columns: 1fr; }

  .panel-header h1 { font-size: 1.5rem; }
}

@media (max-width: 600px) {
  .nav-tabs { width: 100%; }
  .nav-tab { flex: 1; justify-content: center; padding: 8px 12px; }
}

/* ─── DEV WARNING ─── */
.dev-warning-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.dev-warning-box {
  background: var(--bg-card);
  border: 1px solid var(--warn);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 420px;
  width: 90%;
  text-align: center;
  box-shadow: 0 0 40px rgba(245, 166, 35, 0.15);
}

.dev-warning-icon {
  color: var(--warn);
  margin-bottom: 1rem;
}

.dev-warning-box p {
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.dev-warning-box button {
  background: var(--warn);
  color: #000;
  border: none;
  padding: 0.6rem 2rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.dev-warning-box button:hover {
  opacity: 0.85;
}

.dev-warning-overlay.fade-in {
  animation: fadeIn 0.3s ease-out forwards;
}

.dev-warning-overlay.fade-out {
  animation: fadeOut 0.3s ease-out forwards;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}