:root {
  --bg: #020617;
  --bg-elevated: rgba(15, 23, 42, 0.92);
  --bg-elevated-soft: rgba(15, 23, 42, 0.7);
  --border-subtle: rgba(148, 163, 184, 0.3);
  --accent: #22d3ee;
  --accent-soft: rgba(34, 211, 238, 0.12);
  --accent-strong: #06b6d4;
  --text: #e5e7eb;
  --text-muted: #9ca3af;
  --danger: #f97373;
  --radius-lg: 18px;
  --radius-sm: 10px;
  --shadow-lg: 0 22px 60px rgba(15, 23, 42, 0.85);
  --shadow-md: 0 14px 40px rgba(15, 23, 42, 0.7);
  --transition-fast: 0.18s ease-out;
  --transition-slow: 0.25s ease-out;
}

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

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #0f172a 0, #020617 55%);
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  padding: 20px 16px 10px;
  display: flex;
  justify-content: center;
}

.app-brand {
  width: 100%;
  max-width: 1120px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.app-logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 0 0 1px rgba(148, 163, 184, 0.4);
}

.app-logo-link {
  display: inline-flex;
}

.app-brand-text {
  display: flex;
  flex-direction: column;
}

.app-brand-spacer {
  flex: 1;
}

.app-logo-right {
  width: 70px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 10px 24px rgba(0, 0, 0, 0.65));
}

.app-title {
  font-weight: 650;
  letter-spacing: 0.03em;
  font-size: 1.15rem;
}

.app-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.app-tabs {
  display: flex;
  justify-content: center;
  padding: 0 16px 12px;
}

.app-tabs::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.tab-button {
  border: 0;
  background: transparent;
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.9rem;
  cursor: pointer;
  margin: 0 4px;
  transition: background var(--transition-fast), color var(--transition-fast),
    transform var(--transition-fast);
}

.tab-button.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #0b1220;
  box-shadow: 0 8px 26px rgba(34, 211, 238, 0.4);
  transform: translateY(-1px);
}

.tab-button:hover:not(.active) {
  background: rgba(148, 163, 184, 0.1);
}

.app-main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 0 16px 24px;
}

.tab-panel {
  display: none;
  width: 100%;
  max-width: 1120px;
  background: linear-gradient(
      135deg,
      rgba(15, 23, 42, 0.92),
      rgba(15, 23, 42, 0.94)
    ),
    radial-gradient(circle at top right, rgba(56, 189, 248, 0.09), transparent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 22px 22px 20px;
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.tab-panel.active {
  display: block;
}

.panel-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.panel-left,
.panel-right {
  flex: 1 1 260px;
}

.panel-left h2 {
  margin-top: 0;
  font-size: 1.4rem;
}

.panel-left p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.feature-list li::before {
  content: "•";
  color: var(--accent);
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

.drop-zone {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(148, 163, 184, 0.9);
  background: radial-gradient(
      circle at top center,
      rgba(34, 211, 238, 0.12),
      transparent 55%
    ),
    var(--bg-elevated);
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast), transform var(--transition-fast),
    background var(--transition-slow);
}

.drop-zone.dragover {
  border-color: var(--accent);
  box-shadow: 0 18px 50px rgba(34, 211, 238, 0.35);
  transform: translateY(-2px) scale(1.01);
  background: radial-gradient(
      circle at top center,
      rgba(34, 211, 238, 0.18),
      transparent 60%
    ),
    var(--bg-elevated);
}

.drop-inner {
  text-align: center;
  padding: 24px 18px;
}

.drop-icon {
  font-size: 2.8rem;
  margin-bottom: 6px;
}

.drop-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.drop-subtitle {
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco,
    Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.8rem;
  background: rgba(15, 23, 42, 0.9);
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 999px;
  border: 0;
  padding: 8px 18px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #0b1220;
  box-shadow: 0 12px 30px rgba(34, 211, 238, 0.35);
}

.button.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(34, 211, 238, 0.45);
}

.button.danger {
  background: linear-gradient(135deg, #f97373, #ef4444);
  color: #0b1220;
  box-shadow: 0 12px 30px rgba(248, 113, 113, 0.45);
}

.button.danger:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(248, 113, 113, 0.6);
}

.status-text {
  margin-top: 10px;
  min-height: 20px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.status-text.loading::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  border: 2px solid rgba(148, 163, 184, 0.6);
  border-top-color: var(--accent);
  margin-right: 8px;
  animation: spin 0.7s linear infinite;
}

.panel-description {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.file-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  max-height: 360px;
  overflow-y: auto;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, 0.35);
  margin-bottom: 8px;
}

.file-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.file-name {
  font-size: 0.9rem;
}

.file-date {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.file-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: rgba(15, 23, 42, 0.9);
}

.empty-state {
  margin-top: 12px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.archive-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

#archive-search {
  flex: 0 0 220px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  padding: 6px 12px;
  background: rgba(15, 23, 42, 0.94);
  color: var(--text);
  font-size: 0.85rem;
}

.archive-list {
  margin-top: 16px;
  max-height: 380px;
  overflow-y: auto;
}

.archive-group {
  margin-bottom: 18px;
}

.archive-session-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.archive-group-title {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.archive-files {
  list-style: none;
  padding: 0;
  margin: 0;
}

.archive-files li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated-soft);
  border: 1px solid rgba(30, 64, 175, 0.6);
  margin-bottom: 6px;
  font-size: 0.85rem;
}

.app-footer {
  padding: 10px 16px 16px;
  display: flex;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-content {
  max-width: 1120px;
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.footer-content a {
  color: var(--accent);
  text-decoration: none;
}

.footer-content a:hover {
  text-decoration: underline;
}

.footer-separator {
  opacity: 0.6;
  margin: 0 6px;
}

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

@keyframes puff-out {
  0% {
    opacity: 1;
    transform: scale(1);
    filter: blur(0);
  }
  100% {
    opacity: 0;
    transform: scale(0.93);
    filter: blur(4px);
  }
}

.archive-group.puff-out {
  animation: puff-out 0.25s ease-out forwards;
}

@media (max-width: 768px) {
  .tab-panel {
    padding: 18px 16px 16px;
  }

  .panel-layout {
    flex-direction: column;
  }

  .app-header {
    padding-top: 14px;
  }

  .app-title {
    font-size: 1rem;
  }

  #archive-search {
    flex: 1 1 auto;
  }
}