/* ── Basis & Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: #1a2234;
  --bg-hover: #232d42;
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.4);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.4);
  --error: #ef4444;
  --error-glow: rgba(239, 68, 68, 0.4);
  --warning: #f59e0b;
  --disk-body: #374151;
  --disk-top: #4b5563;
  --data-a: #3b82f6;
  --data-b: #8b5cf6;
  --parity: #f59e0b;
  --raid1: #ec4899;
  --raid0: #10b981;
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.app-header {
  text-align: center;
  padding: 2rem 0 1.5rem;
}

.app-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: 0.25rem;
}

.raid-selector {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.5rem 0 1.5rem;
  flex-wrap: wrap;
}

.raid-btn {
  padding: 0.65rem 1.5rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.raid-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.raid-btn.active {
  background: linear-gradient(135deg, var(--accent), #2563eb);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.main-content {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
  flex: 1;
  padding-bottom: 2rem;
}

@media (max-width: 960px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

.info-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem;
  height: fit-content;
  position: sticky;
  top: 1rem;
}

.info-panel h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--accent-light);
}

.info-section {
  margin-bottom: 1.25rem;
}

.info-section h3 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.info-section p,
.info-section ul {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.info-section ul {
  list-style: none;
  padding-left: 0;
}

.info-section li {
  padding: 0.2rem 0;
  padding-left: 1rem;
  position: relative;
}

.info-section li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.legend {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.legend h3 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.legend-block {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.legend-block.data-a { background: var(--data-a); }
.legend-block.data-b { background: var(--data-b); }
.legend-block.parity { background: var(--parity); }
.legend-block.empty { background: var(--disk-body); color: var(--text-muted); }

.workspace {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.toolbar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  padding: 0.6rem 1.25rem;
  border-radius: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #2563eb);
  color: #fff;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.raid-diagram-container {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 2rem;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
}

.connection-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.raid-diagram {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

/* RAID 10 Hierarchie */
.raid10-hierarchy {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  width: 100%;
}

.raid10-top-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--raid0);
  padding: 0.4rem 1.2rem;
  border: 2px solid var(--raid0);
  border-radius: 0.5rem;
  background: rgba(16, 185, 129, 0.1);
}

.raid10-groups {
  display: flex;
  gap: 3rem;
  justify-content: center;
  width: 100%;
}

.raid10-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.raid10-group-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--raid1);
  padding: 0.3rem 1rem;
  border: 2px solid var(--raid1);
  border-radius: 0.4rem;
  background: rgba(236, 72, 153, 0.1);
}

.raid10-group-disks {
  display: flex;
  gap: 1rem;
}

/* Festplatten */
.disk-array {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  align-items: flex-end;
}

.disk {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.disk-body {
  width: 80px;
  background: linear-gradient(180deg, var(--disk-top) 0%, var(--disk-body) 100%);
  border-radius: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.disk-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: center;
}

/* Datenblöcke */
.block {
  width: 100%;
  height: 36px;
  border-radius: 0.35rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
  user-select: none;
}

.block:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.block.data-a { background: var(--data-a); }
.block.data-b { background: var(--data-b); }
.block.parity { background: var(--parity); }
.block.empty {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border-style: dashed;
}

.block.correct {
  animation: pulseCorrect 0.4s ease;
  box-shadow: 0 0 0 2px var(--success);
}

.block.wrong {
  animation: shakeWrong 0.4s ease;
  box-shadow: 0 0 0 2px var(--error);
}

@keyframes pulseCorrect {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

@keyframes shakeWrong {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* Feedback */
.feedback {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem;
  border-radius: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.feedback.hidden {
  display: none;
}

.feedback.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid var(--success);
}

.feedback.error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 1px solid var(--error);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.2s ease;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal-content h3 {
  margin-bottom: 1rem;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.block-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.block-option {
  padding: 0.6rem;
  border-radius: 0.4rem;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}

.block-option:hover {
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.block-option.data-a { background: var(--data-a); color: #fff; }
.block-option.data-b { background: var(--data-b); color: #fff; }
.block-option.parity { background: var(--parity); color: #fff; }
.block-option.empty { color: var(--text-muted); }

/* Footer */
.app-footer {
  text-align: center;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Verbindungslinien Stile */
.connection-line {
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
}

.connection-line.raid0 { stroke: var(--raid0); }
.connection-line.raid1 { stroke: var(--raid1); }
.connection-line.data { stroke: var(--accent); opacity: 0.6; }

/* Responsive */
@media (max-width: 640px) {
  .disk-array {
    gap: 0.75rem;
  }
  .disk-body {
    width: 60px;
  }
  .block {
    height: 30px;
    font-size: 0.7rem;
  }
  .raid10-groups {
    gap: 1.5rem;
  }
}