:root {
  --primary: #4f46e5;
  --bg: #f9fafb;
  --text: #1f2937;
  --border: #e5e7eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --card-bg: #ffffff;
  --input-bg: #ffffff;
  --result-bg: #f3f4f6;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

/* Dark Mode */
body.mode-dark {
  --bg: #0f172a;
  --text: #f1f5f9;
  --card-bg: #1e293b;
  --border: #334155;
  --input-bg: #334155;
  --result-bg: #334155;
}

/* Ambient Mode (follows system preference) */
@media (prefers-color-scheme: dark) {
  body.mode-ambient {
    --bg: #0f172a;
    --text: #f1f5f9;
    --card-bg: #1e293b;
    --border: #334155;
    --input-bg: #334155;
    --result-bg: #334155;
  }
}

.mode-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
}

.mode-toggle button {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.mode-toggle button:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.header {
  text-align: center;
  padding: 2rem 1rem;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: relative;
  transition: background 0.3s;
}

.header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.header p {
  color: var(--text);
  opacity: 0.8;
}

.donate-side-panel {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: var(--primary);
  color: white;
  padding: 0.75rem;
  border-radius: 0.5rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.donate-side-panel p {
  margin: 0 0 0.5rem 0;
  font-size: 0.85rem;
  color: white;
}

.btn-donate-small {
  background: white;
  color: var(--primary);
  border: none;
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
  cursor: pointer;
  font-size: 0.875rem;
  text-decoration: none;
  display: inline-block;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.api-tester {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  transition: background 0.3s;
}

.api-tester h2 {
  margin-bottom: 1.5rem;
  color: var(--text);
}

.api-tester p {
  color: var(--text);
  opacity: 0.8;
}

input[type="text"],
input[type="file"],
input[type="url"],
select,
textarea {
  width: 100%;
  padding: 0.75rem;
  margin: 0.5rem 0 1rem 0;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 1rem;
  background: var(--input-bg);
  color: var(--text);
  transition: all 0.2s;
}

input[type="text"]:focus,
input[type="url"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

input[type="checkbox"] {
  width: auto;
  margin: 0 0.5rem 0 0;
}

label {
  color: var(--text);
  font-weight: 500;
}

.buttons {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

button,
.btn {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  flex: 1;
  min-width: 150px;
  transition: all 0.2s;
}

button:hover,
.btn:hover {
  background: #3e269c;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.result {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: var(--result-bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  min-height: 100px;
  color: var(--text);
  transition: background 0.3s;
}

.result img {
  max-width: 100%;
  border-radius: 0.5rem;
  margin-top: 1rem;
}

.result h3 {
  margin-top: 0;
  color: var(--text);
}

.result p {
  color: var(--text);
  margin: 0.5rem 0;
}

.result a {
  color: var(--primary);
  text-decoration: none;
}

.result a:hover {
  text-decoration: underline;
}

pre {
  background: var(--input-bg);
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  color: var(--text);
  border: 1px solid var(--border);
}

.footer {
  text-align: center;
  padding: 2rem 1rem;
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  color: var(--text);
  transition: background 0.3s;
}

/* Progress bar */
.progress-bar {
  width: 100%;
  height: 20px;
  background: var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin: 1rem 0;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.3s;
}

/* AI Alt-text styling */
.ai-alttext-box {
  margin-top: 1rem;
  padding: 1rem;
  background: #eff6ff;
  border-radius: 0.5rem;
  border-left: 4px solid var(--primary);
}

body.mode-dark .ai-alttext-box {
  background: #1e3a5f;
}

.ai-alttext-box strong {
  color: var(--text);
}

.ai-alttext-box p {
  margin: 0.5rem 0;
  font-style: italic;
  color: var(--text);
}

.ai-alttext-box details {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--text);
  opacity: 0.8;
}

.ai-alttext-box summary {
  cursor: pointer;
  color: var(--text);
}

/* Responsive */
@media (max-width: 768px) {
  .buttons {
    flex-direction: column;
  }

  button,
  .btn {
    width: 100%;
  }

  .donate-side-panel {
    position: static;
    margin-bottom: 1rem;
  }
}