:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-hover: #334155;
  --border: #334155;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.5);
  --success: #10b981;
  --error: #ef4444;
  --radius: 16px;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --font: 'Inter', system-ui, sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  min-height: 100vh;
  padding: 24px;
}

.app {
  max-width: 800px;
  margin: 0 auto;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: -0.025em;
}
.logo-icon {
  font-size: 1.8rem;
}
.badge {
  background: var(--accent);
  color: white;
  padding: 2px 10px;
  border-radius: 40px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-left: 8px;
  vertical-align: middle;
}
.btn-outline {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: 40px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-outline:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
  transform: translateY(-1px);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

/* Key card */
.key-header {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  font-weight: 600;
  color: var(--text);
}
.key-header .chevron {
  margin-left: auto;
  transition: transform 0.3s ease;
  color: var(--text-muted);
}
.open .chevron {
  transform: rotate(180deg);
}
.key-body {
  margin-top: 20px;
  display: block;
}
.key-body.hidden {
  display: none;
}
.input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}
.input-group input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  color: white;
  font-family: var(--font);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}
.input-group input:focus {
  border-color: var(--accent);
}
.icon-btn {
  width: 48px;
  height: 48px;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s;
}
.icon-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--text);
}
.icon-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.key-status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}
.dot.ok {
  background: var(--success);
  box-shadow: 0 0 10px var(--success);
}
.dot.err {
  background: var(--error);
  box-shadow: 0 0 10px var(--error);
}
.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.9rem;
  text-decoration: none;
  padding: 0 4px;
  font-weight: 500;
}
.btn-link:hover {
  text-decoration: underline;
}

/* Model selector */
.model-card label {
  display: block;
  margin-bottom: 12px;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.model-card select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 1rem;
  color: var(--text);
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  background-size: 18px;
}
.model-card select:focus {
  border-color: var(--accent);
}

/* Input area */
.textarea-wrapper {
  position: relative;
}
.textarea-wrapper textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 60px 20px 20px;
  font-family: var(--font);
  font-size: 1.1rem;
  color: white;
  resize: vertical;
  outline: none;
  min-height: 140px;
  transition: border-color 0.2s;
}
.textarea-wrapper textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}
.mic-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s;
}
.mic-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}
.mic-btn.recording {
  background: var(--error);
  color: white;
  border-color: var(--error);
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

/* Generate button */
.btn-primary {
  width: 100%;
  background: var(--accent);
  border: none;
  border-radius: 16px;
  padding: 18px 24px;
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 40px;
  box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}
.btn-primary:active {
  transform: translateY(0);
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Output area */
.output-area {
  animation: slideUp 0.4s ease-out;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.output-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
}
.btn-secondary {
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
}
.btn-secondary:hover {
  border-color: var(--text-muted);
  background: var(--border);
}
.quad-sections {
  display: grid;
  gap: 20px;
}
.quad-section {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.section-header strong {
  color: var(--accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 800;
}
.copy-section {
  background: var(--surface-hover);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  transition: all 0.2s;
}
.copy-section:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.section-content {
  color: #e2e8f0;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
}
.hidden {
  display: none !important;
}

/* Toast */
#toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 14px 28px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  z-index: 1000;
  white-space: nowrap;
}
#toast.show {
  transform: translateX(-50%) translateY(0);
}

/* Footer Actions */
.footer-actions {
  margin-top: 60px;
  border-top: 1px solid var(--border);
  padding-top: 40px;
  padding-bottom: 40px;
}
.full-width {
  width: 100%;
  justify-content: center;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.025em;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}