* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #4c6ef5;
  --primary-dark: #3b5bdb;
  --primary-light: #edf2ff;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2430;
  --text-secondary: #6b7280;
  --border: #e5e8f0;
  --success: #12b886;
  --danger: #fa5252;
  --warning: #fab005;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(30, 41, 90, 0.08);
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 24px 16px 60px;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

.header {
  text-align: center;
  padding: 28px 8px 8px;
}

.header h1 {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-top: 20px;
}

/* ---------- tabs ---------- */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-btn {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #f8f9fd;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
}

.tab-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fade-in 0.2s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

/* ---------- dropzone ---------- */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 44px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
}

.dropzone:hover,
.dropzone:focus-visible,
.dropzone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.dz-icon {
  font-size: 2.6rem;
  line-height: 1;
}

.dz-title {
  margin-top: 12px;
  font-weight: 600;
  font-size: 1rem;
}

.dz-hint {
  margin-top: 6px;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* ---------- url panel ---------- */
#url-input {
  width: 100%;
  resize: vertical;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.9rem;
  font-family: inherit;
  line-height: 1.7;
  background: #fbfcfe;
  transition: border-color 0.15s ease;
}

#url-input:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
}

.url-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.url-hint {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

/* ---------- options ---------- */
.options-card {
  padding: 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  cursor: pointer;
  user-select: none;
}

.check-row input {
  width: 17px;
  height: 17px;
  accent-color: var(--primary);
  cursor: pointer;
}

.target-badge {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 8px;
  padding: 2px 10px;
  font-size: 0.85rem;
  white-space: nowrap;
}

.size-control {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 4px 0 2px;
}

.size-control-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.sc-label {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
}

.sc-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sc-manual {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.sc-manual input[type="number"] {
  border: none;
  outline: none;
  padding: 5px 10px;
  font-size: 0.88rem;
  width: 70px;
  text-align: right;
  font-family: inherit;
  background: transparent;
  color: var(--text);
}

.sc-manual select {
  border: none;
  border-left: 1px solid var(--border);
  outline: none;
  padding: 5px 8px;
  font-size: 0.82rem;
  font-family: inherit;
  background: var(--bg-subtle);
  color: var(--text);
  cursor: pointer;
}

.sc-slider-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sc-slider-wrap input[type="range"] {
  width: 100%;
  height: 6px;
  accent-color: var(--primary);
  cursor: pointer;
}

.sc-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-secondary);
  padding: 0 2px;
}

.sc-ticks span {
  flex: 0 0 auto;
  text-align: center;
  transform: translateX(-50%);
  margin-left: calc(100% / 8);
}

.sc-ticks span:first-child {
  margin-left: 0;
  transform: none;
}

.sc-ticks span:last-child {
  margin-left: auto;
  transform: translateX(50%);
}

.sc-note {
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin: 0;
}

/* ---------- toolbar ---------- */
.toolbar {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.stats b {
  color: var(--text);
}

.stat-saved {
  color: var(--success);
  font-weight: 600;
}

.toolbar-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.progress-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.progress-bar {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), #748ffc);
  transition: width 0.2s ease;
}

.progress-text {
  font-size: 0.82rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* ---------- buttons ---------- */
.btn {
  padding: 9px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn:hover:not(:disabled) {
  border-color: var(--primary);
  color: var(--primary);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

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

.btn-ghost {
  border-color: transparent;
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--danger);
  border-color: transparent;
  background: #fff5f5;
}

/* ---------- file list ---------- */
.file-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.file-item {
  display: flex;
  gap: 14px;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 16px;
  animation: fade-in 0.25s ease;
}

.file-item .thumb {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  border-radius: 10px;
  object-fit: cover;
  background: #f0f2f8;
  border: 1px solid var(--border);
}

.file-item .thumb.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #c3c9db;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.file-pn {
  font-weight: 700;
  color: var(--primary);
  font-size: 0.95rem;
}

.file-origin-name {
  font-size: 0.82rem;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 260px;
}

.file-meta {
  margin-top: 4px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.file-meta b {
  color: var(--text);
}

.file-meta .delta {
  font-weight: 700;
}

.file-meta .delta.saved {
  color: var(--success);
}

.file-meta .delta.grew {
  color: var(--warning);
}

.file-status {
  margin-top: 4px;
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.file-status .spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.file-status.error {
  color: var(--danger);
}

.file-status.done {
  color: var(--success);
}

.mini-progress {
  flex: 1;
  max-width: 160px;
  height: 6px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}

.mini-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--primary);
  border-radius: 999px;
  transition: width 0.15s ease;
}

.file-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.file-actions .btn {
  padding: 7px 14px;
  font-size: 0.85rem;
}

/* ---------- misc ---------- */
.empty-tip {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 40px;
}

.empty-tip b {
  color: var(--primary);
}

.footer {
  text-align: center;
  color: #9aa1b1;
  font-size: 0.78rem;
  margin-top: 44px;
}

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

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  background: #1f2430;
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 0.88rem;
  z-index: 99;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
  animation: fade-in 0.2s ease;
}

.toast.error {
  background: var(--danger);
}

@media (max-width: 640px) {
  body {
    padding: 16px 10px 48px;
  }

  .file-item {
    flex-wrap: wrap;
  }

  .file-actions {
    width: 100%;
    justify-content: flex-end;
  }
}