:root {
  --bg: #060910;
  --panel: #0f1520;
  --panel-2: #18202d;
  --panel-3: #222c3c;
  --accent: #ff8a4d;
  --accent-2: #4dc4ff;
  --accent-3: #b48bff;
  --safe: #4ade80;
  --warn: #fbbf24;
  --danger: #ef4444;
  --text: #e8edf2;
  --text-dim: #8aa0b4;
  --text-faint: #5a6878;
  --border: #2a3441;
  --mono: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }

body {
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  user-select: none;
}

/* ==== Общий топбар ==== */
.topbar {
  flex: 0 0 auto;
  height: 48px;
  display: flex;
  align-items: center;
  padding: 0 18px;
  background: linear-gradient(180deg, #0f1520, #0a1018);
  border-bottom: 1px solid var(--border);
  gap: 24px;
  z-index: 10;
}
.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.2px;
  color: var(--accent);
}
.brand:hover { opacity: 0.85; }
.site-nav { display: flex; gap: 2px; }
.site-nav a {
  padding: 6px 14px;
  border-radius: 6px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 12.5px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.site-nav a:hover { color: var(--text); background: var(--panel-2); }
.site-nav a.active {
  color: var(--text);
  background: var(--panel-2);
  box-shadow: inset 0 -2px 0 var(--accent);
}
.topbar-spacer { flex: 1; }
.contact-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 12.5px;
  white-space: nowrap;
}
.contact-link:hover { color: var(--text); }
.topbar .lang-picker { display: inline-flex; align-items: center; max-width: 140px; }
.topbar .lang-picker select {
  width: 100%;
  appearance: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--text);
  padding: 6px 28px 6px 10px;
  font-size: 12px;
  cursor: pointer;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-dim) 50%), linear-gradient(135deg, var(--text-dim) 50%, transparent 50%);
  background-position: calc(100% - 14px) calc(50% - 2px), calc(100% - 9px) calc(50% - 2px);
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

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

/* === Header === */
header {
  padding: 10px 18px;
  background: linear-gradient(180deg, #0f1520, #0a1018);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 24px;
}
header h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.4px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
header h1 .sub {
  font-size: 11px;
  color: var(--text-faint);
  font-weight: 400;
  letter-spacing: 1.4px;
  text-transform: uppercase;
}
.case-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 12px;
  color: var(--text-dim);
  flex: 1;
}
.case-info .lbl { color: var(--text-faint); }
.case-info #caseName { color: var(--text); font-weight: 600; }
.case-desc { font-size: 11px; color: var(--text-faint); }

/* === Main === */
main {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* === Viewport === */
.viewport {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse at center, #1a0a06 0%, #050203 70%),
    #000;
  overflow: hidden;
}

#fundusCanvas {
  cursor: none;
  border-radius: 50%;
  box-shadow:
    0 0 60px rgba(0,0,0,0.95),
    inset 0 0 80px rgba(0,0,0,0.7);
  max-width: 95%;
  max-height: 95%;
}

.overlay-hud {
  position: absolute;
  background: rgba(8, 12, 20, 0.92);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 11px;
  font-family: var(--mono);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 160px;
}
.overlay-hud.top-left { top: 16px; left: 16px; }
.overlay-hud.bottom-right { bottom: 16px; right: 16px; }
.hud-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}
.hud-row .k { color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.7px; }
.hud-row .v { color: var(--text); font-weight: 600; }

/* === Controls === */
.controls {
  width: 308px;
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.controls::-webkit-scrollbar { width: 8px; }
.controls::-webkit-scrollbar-thumb { background: var(--panel-3); border-radius: 4px; }

.panel {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}
.panel-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-faint);
  margin-bottom: 8px;
  font-weight: 600;
}

.depth-view {
  text-align: center;
  padding: 10px;
}
.depth-view canvas {
  display: block;
  margin: 0 auto;
  border-radius: 6px;
  background: #060910;
}
.depth-hint {
  font-size: 10px;
  color: var(--text-faint);
  margin-top: 6px;
}

.control-group .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.control-group label {
  font-size: 12px;
  color: var(--text-dim);
}
.badge {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text);
  background: var(--panel-3);
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.control-group input[type=range] {
  width: 100%;
  accent-color: var(--accent);
  margin: 4px 0 2px;
}
.hint {
  font-size: 10px;
  color: var(--text-faint);
  margin-top: 4px;
  line-height: 1.4;
}

/* === Status === */
.status {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.status .panel-title { margin-bottom: 2px; }
.status-bar {
  display: grid;
  grid-template-columns: 78px 1fr 44px;
  align-items: center;
  gap: 8px;
  font-size: 11px;
}
.status-bar label {
  color: var(--text-dim);
}
.bar {
  height: 7px;
  background: #060910;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid #0a1018;
}
.fill {
  height: 100%;
  width: 0%;
  transition: width 0.25s, background 0.3s;
  border-radius: 4px;
}
.fill.safe { background: linear-gradient(90deg, #22c55e, #4ade80); }
.fill.warn { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.fill.danger { background: linear-gradient(90deg, #dc2626, #ef4444); }
.status-bar > span {
  text-align: right;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text);
}

/* === Buttons === */
.buttons {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
}
.buttons button {
  background: var(--panel-3);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 9px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.15s;
}
.buttons button:hover {
  background: #2c3848;
  border-color: var(--accent);
}
.buttons button.primary {
  background: var(--accent);
  color: #1a0a00;
  border-color: var(--accent);
  font-weight: 600;
}
.buttons button.primary:hover {
  background: #ffa066;
}

/* === Alerts === */
#alerts {
  position: fixed;
  left: 16px;
  bottom: 48px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 5px;
  max-width: 340px;
  pointer-events: none;
}
.alert {
  padding: 7px 10px;
  border-radius: 5px;
  font-size: 11px;
  line-height: 1.35;
  animation: alertSlide 0.25s ease;
  background: var(--panel-2);
  border-left: 3px solid var(--text-faint);
}
.alert.warn {
  background: rgba(251, 191, 36, 0.10);
  border-left-color: var(--warn);
  color: #fbe6a0;
}
.alert.danger {
  background: rgba(239, 68, 68, 0.13);
  border-left-color: var(--danger);
  color: #fda4af;
}
.alert.info {
  background: rgba(77, 196, 255, 0.10);
  border-left-color: var(--accent-2);
  color: #bee7ff;
}
.alert.good {
  background: rgba(74, 222, 128, 0.10);
  border-left-color: var(--safe);
  color: #bbf7d0;
}
@keyframes alertSlide {
  from { opacity: 0; transform: translateX(-14px); }
  to { opacity: 1; transform: translateX(0); }
}

/* === Footer === */
footer {
  padding: 8px 18px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-faint);
}
.hotkeys {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
kbd {
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text);
}

/* === Modals === */
#modal, #caseModal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.2s ease;
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
#modal.hidden, #caseModal.hidden { display: none; }
.modal-content {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px 28px;
  max-width: 520px;
  text-align: left;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}
.modal-content h2 {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 20px;
}
.modal-content p {
  color: var(--text-dim);
  line-height: 1.55;
  font-size: 13px;
  margin: 0;
}
.modal-buttons {
  margin-top: 20px;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}
.modal-content button {
  background: var(--panel-3);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 9px 18px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
}
.modal-content button.primary {
  background: var(--accent);
  color: #1a0a00;
  border-color: var(--accent);
  font-weight: 600;
}
.modal-content button:hover { filter: brightness(1.15); }

.case-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}
.case-item {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.case-item:hover {
  background: var(--panel-3);
  border-color: var(--accent);
}
.case-item .name {
  color: var(--text);
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 3px;
}
.case-item .desc {
  color: var(--text-faint);
  font-size: 11px;
  line-height: 1.4;
}
.case-item .difficulty {
  display: inline-block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 1px 6px;
  border-radius: 3px;
  margin-left: 8px;
  font-weight: 600;
}
.case-item .difficulty.easy { background: rgba(74,222,128,0.15); color: var(--safe); }
.case-item .difficulty.medium { background: rgba(251,191,36,0.15); color: var(--warn); }
.case-item .difficulty.hard { background: rgba(239,68,68,0.15); color: var(--danger); }

@media (max-width: 1100px) {
  .controls { width: 270px; }
}
@media (max-width: 900px) {
  main { flex-direction: column; }
  .controls { width: 100%; max-height: 40vh; }
}