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

:root {
  --bg-primary: #0b1120;
  --bg-secondary: #131c31;
  --bg-card: #1a2540;
  --bg-hover: #1f2d4f;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #60a5fa;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #1e3a5f;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --radius: 8px;
  --radius-sm: 6px;
}

html {
  font-size: 14px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

a {
  color: var(--accent-light);
  text-decoration: none;
}

a:hover {
  color: var(--accent);
}

/* Layout */
.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 24px;
}

.container-wide {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-logo svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 24px;
}

.card-header {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Tool Cards Grid (Index page) */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tool-card:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateY(-2px);
}

.tool-card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.tool-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.tool-card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

input[type="text"],
input[type="password"],
input[type="email"],
textarea,
select {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 14px;
  width: 100%;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

select {
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  transition: background 0.2s;
}

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

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

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

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

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
}

/* Output Area */
.output-area {
  margin-top: 24px;
  display: none;
}

.output-area.visible {
  display: block;
}

.output-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  white-space: pre-wrap;
  word-wrap: break-word;
  line-height: 1.7;
  font-size: 14px;
  min-height: 100px;
}

.output-content p {
  margin-bottom: 12px;
}

.output-content p:last-child {
  margin-bottom: 0;
}

.output-content h1, .output-content h2, .output-content h3 {
  margin-top: 20px;
  margin-bottom: 10px;
  font-weight: 600;
}

.output-content h1 { font-size: 20px; }
.output-content h2 { font-size: 17px; }
.output-content h3 { font-size: 15px; }

.output-content ul, .output-content ol {
  margin: 8px 0;
  padding-left: 20px;
}

.output-content li {
  margin-bottom: 4px;
}

.output-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* Loading */
.loading {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 32px;
  color: var(--text-secondary);
  font-size: 14px;
}

.loading.visible {
  display: flex;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Error */
.error-msg {
  display: none;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--error);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 13px;
  margin-top: 12px;
}

.error-msg.visible {
  display: block;
}

/* API Key Bar */
.api-key-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
}

.api-key-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.api-key-status .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.api-key-status .dot.active {
  background: var(--success);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-overlay.visible {
  display: flex;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  width: 90%;
  max-width: 440px;
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 20px;
}

/* Page Title */
.page-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* Back Button */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
  padding: 4px 0;
  margin-bottom: 16px;
}

.back-btn:hover {
  color: var(--text-primary);
}

/* Section Divider */
.section-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* Markdown rendered output */
.output-content pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  overflow-x: auto;
  margin: 12px 0;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.5;
}

.output-content code {
  background: rgba(0, 0, 0, 0.3);
  padding: 2px 5px;
  border-radius: 3px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
}

.output-content pre code {
  padding: 0;
  background: none;
}

.output-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 14px;
  margin: 12px 0;
  color: var(--text-secondary);
}

.output-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

.output-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
}

.output-content th,
.output-content td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
  font-size: 13px;
}

.output-content th {
  background: var(--bg-card);
  font-weight: 600;
}

/* Copy button */
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
}

.copy-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

.output-wrapper {
  position: relative;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  z-index: 200;
  opacity: 0;
  transition: opacity 0.3s;
}

.toast.visible {
  opacity: 1;
}

/* Responsive */
@media (max-width: 640px) {
  .container,
  .container-wide {
    padding: 16px;
  }

  .header {
    padding: 12px 16px;
  }

  .tool-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .tool-card {
    padding: 18px;
  }

  .modal {
    padding: 20px;
  }
}