:root {
  --bg: #0b0f14;
  --panel: #11151b;
  --text: #c9d1d9;
  --muted: #8b949e;
  --accent: #00d9ff;
  --accent2: #7c4dff;
  --border: #1f2630;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background: linear-gradient(180deg, #0b0f14, #0e1218);
  color: var(--text);
}
.header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--border); background: var(--panel);
}
.header nav a { color: var(--muted); margin-left: 1rem; text-decoration: none; }
.header nav a:hover { color: var(--text); }
.brand { font-weight: 700; letter-spacing: 0.05em; color: var(--accent); }
.container { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }
.hero { padding: 1rem 0 2rem; }
.grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem;
}
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 1rem;
  text-decoration: none; color: var(--text); transition: transform 0.12s ease, border-color 0.12s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card.disabled { opacity: 0.6; pointer-events: none; }
.footer { padding: 1rem 1.25rem; border-top: 1px solid var(--border); color: var(--muted); }
button, .btn {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #0b0f14; border: none; border-radius: 10px; padding: 0.6rem 1rem; font-weight: 700; cursor: pointer;
}
.panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 1rem;
}
/* helper */
.muted { color: var(--muted); font-size: 0.9em; }

/* Board selector */
.board-select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.95em;
  cursor: pointer;
  transition: border-color 0.2s ease;
}
.board-select:hover {
  border-color: var(--accent);
}
.board-select:focus {
  outline: none;
  border-color: var(--accent);
}

/* Upload history */
.upload-history {
  font-size: 0.9em;
}
.upload-history-header {
  user-select: none;
}
.upload-history-header:hover {
  background: rgba(0, 217, 255, 0.05);
}
.upload-history-item {
  font-family: 'Courier New', monospace;
}
.toggle-icon {
  color: var(--muted);
  font-size: 0.8em;
}

/* AI Button */
.ai-btn {
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.6rem 1rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 0 15px rgba(0, 217, 255, 0.3);
  transition: all 0.3s ease;
}

.ai-btn:hover {
  box-shadow: 0 0 25px rgba(0, 217, 255, 0.5);
  transform: translateY(-2px);
}

/* AI Modal */
.ai-modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(5px);
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
}

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

.ai-modal-content {
  background: var(--panel);
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 0;
  max-width: 800px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.4);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.ai-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(90deg, rgba(0, 217, 255, 0.1), rgba(124, 77, 255, 0.1));
}

.ai-modal-header h2 {
  margin: 0;
  color: var(--accent);
  font-size: 1.5rem;
  text-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
}

.close-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease;
  padding: 0;
  width: 40px;
  height: 40px;
}

.close-btn:hover {
  color: var(--accent);
}

.ai-modal-body {
  padding: 1.5rem;
}

/* AI Mode Selector */
.ai-mode-selector {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.ai-mode-selector label {
  display: flex;
  align-items: center;
  cursor: pointer;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s ease;
}

.ai-mode-selector label:hover {
  border-color: var(--accent);
  background: rgba(0, 217, 255, 0.05);
}

.ai-mode-selector input[type="radio"] {
  margin-right: 0.5rem;
  accent-color: var(--accent);
}

.ai-mode-selector input[type="radio"]:checked + span {
  color: var(--accent);
  font-weight: 600;
}

/* AI Input Section */
.ai-input-section {
  margin-bottom: 1.5rem;
}

.ai-input-section label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text);
  font-weight: 600;
}

.ai-prompt {
  width: 100%;
  min-height: 100px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  resize: vertical;
  transition: border-color 0.2s ease;
}

.ai-prompt:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(0, 217, 255, 0.2);
}

.generate-btn {
  margin-top: 1rem;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.generate-btn:hover:not(:disabled) {
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.5);
  transform: translateY(-2px);
}

.generate-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* AI Loading */
.ai-loading {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border);
  border-top: 4px solid var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.ai-loading p {
  margin-top: 1rem;
  color: var(--muted);
}

/* AI Error */
.ai-error {
  display: none;
  padding: 1rem;
  background: rgba(255, 0, 110, 0.1);
  border: 1px solid rgba(255, 0, 110, 0.3);
  border-radius: 8px;
  color: #ff006e;
  margin-bottom: 1rem;
}

/* AI Result */
.ai-result {
  display: none;
}

.ai-result h3 {
  color: var(--accent);
  margin-bottom: 1rem;
}

.generated-code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  max-height: 400px;
  overflow-y: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text);
}

/* AI Actions */
.ai-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.put-in-ide-btn,
.generate-pinout-btn {
  flex: 1;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
}

.generate-pinout-btn {
  background: linear-gradient(90deg, var(--accent2), #9c4dff);
}

.put-in-ide-btn:hover,
.generate-pinout-btn:hover {
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.5);
  transform: translateY(-2px);
}

/* Success Notification */
.success-notification {
  display: none;
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff;
  padding: 1rem 1.5rem;
  border-radius: 10px;
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.5);
  align-items: center;
  gap: 0.75rem;
  z-index: 2000;
  animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.success-icon {
  font-size: 1.5rem;
  font-weight: 700;
}

.success-message {
  font-weight: 600;
}

/* Accessibility */
.ai-modal-content:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}