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

:root {
  --bg:        #0f0f13;
  --surface:   #18181f;
  --surface2:  #22222c;
  --border:    #2e2e3a;
  --accent:    #6366f1;
  --accent-h:  #818cf8;
  --success:   #22c55e;
  --danger:    #ef4444;
  --text:      #f0f0f5;
  --text-muted:#8b8b9e;
  --radius:    14px;
  --radius-sm: 8px;
  --shadow:    0 4px 24px rgba(0,0,0,0.4);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ─── Layout ────────────────────────────────────────────────── */
.app { display: flex; flex-direction: column; min-height: 100vh; }

.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo { display: flex; align-items: center; gap: 10px; }
.logo-text { font-size: 1rem; font-weight: 700; letter-spacing: -0.02em; }

.badge {
  background: rgba(99,102,241,0.15);
  color: var(--accent-h);
  border: 1px solid rgba(99,102,241,0.3);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 20px;
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 24px;
  width: 100%;
  align-items: start;
}

/* ─── Panels ────────────────────────────────────────────────── */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.panel-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.panel-icon { font-size: 1rem; }

.file-count {
  margin-left: auto;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.75rem;
  padding: 2px 10px;
  color: var(--text);
  letter-spacing: 0;
  text-transform: none;
}

/* ─── Dropzone ──────────────────────────────────────────────── */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, background 0.2s;
  cursor: pointer;
}
.dropzone:hover, .dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(99,102,241,0.05);
}

.dropzone-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 36px 20px;
  gap: 8px;
}

.drop-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 4px;
}

.drop-title { font-size: 1rem; font-weight: 600; }
.drop-sub   { font-size: 0.82rem; color: var(--text-muted); }
.drop-hint  { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }

/* ─── File list ─────────────────────────────────────────────── */
.file-list {
  list-style: none;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 320px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 0.82rem;
  animation: slideIn 0.15s ease;
}

.file-thumb {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--border);
}

.file-info { flex: 1; min-width: 0; }
.file-name {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-size { font-size: 0.72rem; color: var(--text-muted); }

.file-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.15s;
}
.file-remove:hover { color: var(--danger); }

.upload-actions { margin-top: 12px; display: flex; justify-content: flex-end; }

/* ─── Divider ───────────────────────────────────────────────── */
.divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 18px 0 14px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ─── Toggle cards ──────────────────────────────────────────── */
.toggles-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 4px;
}

.toggle-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
}
.toggle-card input { display: none; }
.toggle-card:hover { border-color: var(--accent); }
.toggle-card.active {
  border-color: var(--accent);
  background: rgba(99,102,241,0.08);
}

.toggle-card-body { flex: 1; display: flex; align-items: center; gap: 10px; }
.toggle-card-icon { font-size: 1.2rem; }
.toggle-card-label { font-size: 0.88rem; font-weight: 600; }
.toggle-card-sub   { font-size: 0.72rem; color: var(--text-muted); margin-left: 4px; }

/* Custom toggle switch */
.toggle-switch {
  width: 36px;
  height: 20px;
  background: var(--border);
  border-radius: 20px;
  position: relative;
  flex-shrink: 0;
  transition: background 0.2s;
}
.toggle-switch::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  top: 3px;
  left: 3px;
  transition: transform 0.2s;
}
.toggle-card.active .toggle-switch {
  background: var(--accent);
}
.toggle-card.active .toggle-switch::after {
  transform: translateX(16px);
}

/* ─── Sliders ───────────────────────────────────────────────── */
.setting-group { margin-bottom: 14px; }

.setting-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  margin-bottom: 6px;
  color: var(--text);
}
.setting-value {
  font-weight: 700;
  color: var(--accent-h);
  min-width: 32px;
  text-align: right;
}

.slider {
  width: 100%;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 4px;
  background: var(--border);
  outline: none;
  cursor: pointer;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}
.slider::-webkit-slider-thumb:hover { transform: scale(1.15); }
.slider:focus::-webkit-slider-thumb { box-shadow: 0 0 0 3px rgba(99,102,241,0.3); }

.slider-hints {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 3px;
}

/* ─── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, opacity 0.15s;
  text-decoration: none;
  padding: 9px 18px;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-h); }

.btn-success {
  background: var(--success);
  color: #fff;
}
.btn-success:hover { filter: brightness(1.1); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}
.btn-ghost:hover { color: var(--text); }

.btn-danger {
  background: rgba(239,68,68,0.12);
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.2);
}
.btn-danger:hover { background: rgba(239,68,68,0.22); }

.btn-lg { width: 100%; padding: 13px 18px; font-size: 0.95rem; border-radius: var(--radius); margin-top: 8px; }
.btn-sm { font-size: 0.78rem; padding: 6px 12px; }

/* ─── Progress ──────────────────────────────────────────────── */
.progress-wrap {
  margin-top: 16px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  margin-bottom: 10px;
  color: var(--text-muted);
}

.progress-bar-track {
  height: 6px;
  background: var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-h));
  border-radius: 6px;
  width: 0%;
  transition: width 0.3s ease;
}

/* ─── Download ──────────────────────────────────────────────── */
.download-wrap {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.download-success {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(34,197,94,0.08);
  border: 1px solid rgba(34,197,94,0.2);
  border-radius: var(--radius);
  padding: 14px;
}

.success-icon { font-size: 1.5rem; }
.success-title { font-size: 0.9rem; font-weight: 600; color: var(--success); }
.success-sub   { font-size: 0.78rem; color: var(--text-muted); margin-top: 2px; }

/* ─── Animations ────────────────────────────────────────────── */
@keyframes slideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 820px) {
  .main { grid-template-columns: 1fr; }
  .panel-settings { order: -1; }
}