/* ─── Design Tokens ────────────────────────────────────────────── */
:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(30, 30, 55, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #e8e8f0;
  --text-secondary: #8888a8;
  --text-muted: #55556a;
  --accent: #6c5ce7;
  --accent-glow: rgba(108, 92, 231, 0.3);
  --accent-hover: #7e6ff0;
  --success: #00cec9;
  --danger: #ff7675;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset & Base ─────────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 40px 20px;
  overflow-y: auto;
}

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 20%, rgba(108, 92, 231, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(0, 206, 201, 0.05) 0%, transparent 50%);
  z-index: -1;
  animation: bgShift 20s ease-in-out infinite alternate;
}

@keyframes bgShift {
  0% { transform: translate(0, 0); }
  100% { transform: translate(-5%, -3%); }
}

/* ─── Container ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 640px;
}

.app-header {
  text-align: center;
  margin-bottom: 36px;
}

.app-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-header p {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ─── Card ─────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  transition: border-color var(--transition);
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.card-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.card-label .icon {
  font-size: 1rem;
}

/* ─── Upload Zone ──────────────────────────────────────────────── */
.upload-zone {
  border: 2px dashed rgba(108, 92, 231, 0.3);
  border-radius: var(--radius-sm);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-glass);
  position: relative;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  background: rgba(108, 92, 231, 0.06);
  transform: translateY(-2px);
}

.upload-zone .upload-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
  opacity: 0.7;
}

.upload-zone .upload-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.upload-zone .upload-text strong {
  color: var(--accent);
}

.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* File list */
.file-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.85rem;
  animation: fadeSlideIn 0.3s ease;
}

.file-item .file-name {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.file-item .remove-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all var(--transition);
}

.file-item .remove-btn:hover {
  color: var(--danger);
  background: rgba(255, 118, 117, 0.1);
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Text Area ────────────────────────────────────────────────── */
textarea {
  width: 100%;
  min-height: 100px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.6;
  resize: vertical;
  transition: all var(--transition);
  outline: none;
}

textarea::placeholder {
  color: var(--text-muted);
}

textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ─── Checkbox Group ───────────────────────────────────────────── */
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
}

.checkbox-item:hover {
  background: rgba(108, 92, 231, 0.06);
  border-color: rgba(108, 92, 231, 0.2);
}

.checkbox-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  flex-shrink: 0;
}

.checkbox-item input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.checkbox-item input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

.checkbox-item .template-name {
  font-size: 0.9rem;
  color: var(--text-primary);
}

.select-all-bar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 10px;
}

.select-all-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all var(--transition);
}

.select-all-btn:hover {
  background: rgba(108, 92, 231, 0.1);
}

/* ─── Generate Button ──────────────────────────────────────────── */
.generate-btn {
  width: 100%;
  padding: 16px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #5a4bd1);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 20px var(--accent-glow);
  position: relative;
  overflow: hidden;
}

.generate-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(108, 92, 231, 0.45);
}

.generate-btn:active:not(:disabled) {
  transform: translateY(0);
}

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

.generate-btn .btn-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

/* Loading spinner */
.spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 2.5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.generate-btn.loading .spinner {
  display: block;
}

.generate-btn.loading .btn-text {
  display: none;
}

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

/* ─── Toast ────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
  font-size: 0.9rem;
  color: var(--text-primary);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  max-width: 90vw;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.error {
  border-color: rgba(255, 118, 117, 0.3);
}

.toast.success {
  border-color: rgba(0, 206, 201, 0.3);
}

/* ─── Responsive ───────────────────────────────────────────────── */
@media (max-width: 480px) {
  body {
    padding: 20px 12px;
  }

  .card {
    padding: 20px;
  }

  .app-header h1 {
    font-size: 1.4rem;
  }
}