/* public/styles.css */
:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --accent: #0ea5e9;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --ok: #16a34a;
  --warn: #b45309;
  --warn-bg: #fef3c7;
  --err: #b91c1c;
  --err-bg: #fee2e2;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app-header {
  text-align: center;
  padding: 28px 16px 8px;
}
.app-header h1 {
  margin: 0;
  font-size: 2rem;
  color: var(--primary);
}
.tagline {
  margin: 6px 0 0;
  color: var(--muted);
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
.card h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 0.9rem;
}

.row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.row label {
  flex: 1;
  min-width: 200px;
}
label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
}
select,
input[type="text"] {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
}
select:focus,
input:focus {
  outline: 2px solid var(--primary);
  border-color: var(--primary);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.tab {
  flex: 1;
  min-width: 100px;
  padding: 10px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: inherit;
}
.tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}

.file-drop {
  display: block;
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 26px 16px;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  font-weight: 500;
}
.file-drop:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.file-drop input {
  display: none;
}
.preview {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}
.preview img {
  width: 74px;
  height: 74px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.hint {
  color: var(--warn);
  font-size: 0.9rem;
  margin: 10px 0 0;
}

/* Modes */
.modes {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.mode {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  border: 2px solid var(--border);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
}
.mode.active {
  border-color: var(--primary);
  background: #eef2ff;
}
.mode-icon {
  font-size: 1.6rem;
}
.mode-title {
  font-weight: 700;
  font-size: 1.05rem;
}
.mode-desc {
  color: var(--muted);
  font-size: 0.88rem;
}

.scope {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
  font-size: 0.95rem;
}
.scope label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.btn-primary {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
}
.btn-primary:hover {
  background: var(--primary-dark);
}
.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.btn-secondary {
  padding: 10px 16px;
  border: 1px solid var(--primary);
  background: #fff;
  color: var(--primary);
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  font-family: inherit;
}
.btn-secondary:hover {
  background: #eef2ff;
}

/* Status messages */
.status {
  padding: 14px 16px;
  border-radius: 12px;
  margin-bottom: 18px;
  font-weight: 500;
}
.status.loading {
  background: #e0f2fe;
  color: #075985;
}
.status.error {
  background: var(--err-bg);
  color: var(--err);
}
.status.warn {
  background: var(--warn-bg);
  color: var(--warn);
}
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 3px solid #93c5fd;
  border-top-color: #075985;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Result */
.hidden {
  display: none;
}
.result-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 12px;
}
.lesson h1,
.lesson h2 {
  color: var(--primary-dark);
}
.lesson h1 {
  font-size: 1.5rem;
}
.lesson h2 {
  font-size: 1.15rem;
  margin-top: 20px;
}
.lesson code {
  background: #f3f4f6;
  padding: 1px 5px;
  border-radius: 4px;
}
.lesson ul,
.lesson ol {
  padding-left: 22px;
}

/* Presentation slides */
.slide {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 14px;
  background: linear-gradient(135deg, #eef2ff 0%, #f0f9ff 100%);
}
.slide.title-slide {
  text-align: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: #fff;
}
.slide-num {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 6px;
}
.title-slide .slide-num {
  color: rgba(255, 255, 255, 0.8);
}
.slide h3 {
  margin: 0 0 10px;
  font-size: 1.25rem;
}
.slide ul {
  margin: 0;
  padding-left: 22px;
}
.slide li {
  margin-bottom: 6px;
}
.slide-note {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

.app-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 20px;
}