:root {
  --bg: #0a0e17;
  --panel: #121826;
  --panel-2: #1a2234;
  --text: #eef2f8;
  --muted: #8b9bb5;
  --accent: #5b8def;
  --accent-2: #7c5cff;
  --border: #273149;
  --ok: #3dd68c;
  --warn: #f5b942;
  --err: #ff6b7a;
  font-family: "SF Pro Text", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at top left, #141b33, var(--bg) 45%);
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px 16px 32px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

header p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 560px;
}

.badge {
  font-size: 0.78rem;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
}

.badge.ok { color: var(--ok); border-color: rgba(61, 214, 140, 0.35); }
.badge.err { color: var(--err); border-color: rgba(255, 107, 122, 0.35); }

.layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 16px;
  min-height: calc(100vh - 120px);
}

.panel {
  background: rgba(18, 24, 38, 0.92);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.left {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.block {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.block h2 {
  margin: 0 0 12px;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

input[type="file"] {
  width: 100%;
  color: var(--muted);
  font-size: 0.85rem;
}

.file-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-list li {
  font-size: 0.85rem;
  padding: 8px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
}

textarea {
  width: 100%;
  min-height: 120px;
  resize: vertical;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  font: inherit;
  line-height: 1.45;
}

button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

button {
  width: 100%;
  margin-top: 12px;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn.secondary {
  width: auto;
  margin-top: 0;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 500;
  padding: 8px 14px;
}

.log-block {
  flex: 1;
}

.status {
  font-size: 0.88rem;
  color: var(--muted);
}

.status.running { color: var(--warn); }
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }

.log {
  margin-top: 10px;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted);
  white-space: pre-wrap;
  max-height: 220px;
  overflow-y: auto;
}

.right {
  display: flex;
  flex-direction: column;
  min-height: 640px;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
}

.preview-header h2 {
  margin: 0;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.preview-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.slide-meta {
  font-size: 0.85rem;
  color: var(--muted);
}

.preview-empty,
.preview-loading {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
  color: var(--muted);
}

.empty-icon {
  font-size: 3rem;
  opacity: 0.35;
  margin-bottom: 12px;
}

.preview-loading .muted {
  font-size: 0.85rem;
  margin-top: 8px;
}

.spinner {
  width: 42px;
  height: 42px;
  border: 3px solid rgba(255, 255, 255, 0.08);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin-bottom: 16px;
}

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

.preview-ready {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 14px;
}

.slide-stage {
  flex: 1;
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  gap: 10px;
  align-items: center;
  min-height: 360px;
}

#main-slide {
  width: 100%;
  max-height: 58vh;
  object-fit: contain;
  background: #090d15;
  border: 1px solid var(--border);
  border-radius: 14px;
}

.nav-btn {
  width: 44px;
  height: 44px;
  margin-top: 0;
  border-radius: 50%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.4rem;
  line-height: 1;
}

.thumb-strip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.thumb {
  flex: 0 0 auto;
  width: 120px;
  border: 2px solid transparent;
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  background: #090d15;
}

.thumb.active {
  border-color: var(--accent);
}

.thumb img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.hidden { display: none !important; }

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
  }
}