:root {
  --bg: #f6f7f9;
  --panel: rgba(255, 255, 255, 0.92);
  --text: #17191d;
  --muted: #707782;
  --line: #e4e7eb;
  --accent: #111827;
  --accent-2: #2b3443;
  --soft: #eef1f5;
  --danger: #b42318;
  --radius: 18px;
  --shadow: 0 14px 38px rgba(15, 23, 42, 0.07);
}

* { box-sizing: border-box; }

html { min-width: 320px; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 10% 0%, rgba(148, 163, 184, .16), transparent 25%),
    var(--bg);
  color: var(--text);
}

button, input, select, textarea { font: inherit; }

button { color: inherit; }

.app-shell {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 44px 0 54px;
}

.hero {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.eyebrow {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--muted);
}

h1 {
  margin: 8px 0 8px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.03;
  letter-spacing: -0.045em;
}

.hero p {
  margin: 0;
  max-width: 780px;
  color: var(--muted);
  line-height: 1.65;
}

.layout { display: grid; gap: 18px; }

.panel {
  background: var(--panel);
  border: 1px solid rgba(228, 231, 235, .9);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.section-head > div:first-child {
  display: flex;
  align-items: center;
  gap: 10px;
}

h2 {
  font-size: 20px;
  margin: 0;
  letter-spacing: -0.02em;
}

.step {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: var(--accent);
  color: white;
  font-size: 12px;
  font-weight: 800;
}

.muted {
  color: var(--muted);
  font-size: 13px;
}

.dropzone {
  min-height: 180px;
  border: 1.5px dashed #c9ced6;
  border-radius: 16px;
  background: #fafbfc;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 7px;
  cursor: pointer;
  transition: .18s ease;
}

.dropzone:hover, .dropzone.dragging {
  border-color: #8b95a5;
  background: #f3f5f8;
  transform: translateY(-1px);
}

.dropzone span { color: var(--muted); font-size: 13px; }

.drop-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--accent);
  color: white;
  font-size: 26px;
  line-height: 1;
}

.file-list {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.file-row {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
}

.file-thumb {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 9px;
  background: var(--soft);
}

.file-name {
  font-size: 14px;
  font-weight: 650;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-meta {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.icon-button {
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 8px 10px;
  border-radius: 9px;
  color: var(--muted);
}

.icon-button:hover { background: var(--soft); color: var(--danger); }

.field-grid {
  display: flex;
  gap: 16px;
  align-items: stretch;
}

.watermark-input-grid .grow { flex: 1; }
.watermark-input-grid .compact { width: min(280px, 35%); }

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field > span,
.inline-field > span {
  font-size: 13px;
  font-weight: 700;
}

.field small {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
}

textarea, select, input[type="text"] {
  width: 100%;
  color: var(--text);
  background: white;
  border: 1px solid #d7dce2;
  border-radius: 10px;
  outline: none;
}

textarea {
  min-height: 130px;
  resize: vertical;
  padding: 12px;
  line-height: 1.6;
}

select, input[type="text"] { height: 42px; padding: 0 11px; }

textarea:focus, select:focus, input[type="text"]:focus {
  border-color: #8993a2;
  box-shadow: 0 0 0 3px rgba(100, 116, 139, .12);
}

.chip-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.chip {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: white;
  font-size: 13px;
}

.chip span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 360px;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 24px;
}

output {
  float: right;
  color: var(--muted);
  font-weight: 600;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.color-row {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 8px;
}

input[type="color"] {
  width: 54px;
  height: 42px;
  padding: 3px;
  border: 1px solid #d7dce2;
  border-radius: 10px;
  background: white;
}

.preview-head { align-items: flex-start; }

.preview-actions {
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.inline-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 220px;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.preview-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #0f1115;
}

.preview-canvas-wrap {
  height: 250px;
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    linear-gradient(45deg, #1b1e24 25%, transparent 25%),
    linear-gradient(-45deg, #1b1e24 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1b1e24 75%),
    linear-gradient(-45deg, transparent 75%, #1b1e24 75%),
    #15181e;
  background-size: 18px 18px;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0px;
}

.preview-card canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
  box-shadow: 0 8px 28px rgba(0,0,0,.28);
}

.preview-meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  color: #eef2f7;
  font-size: 12px;
  background: #11141a;
}

.preview-meta span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.button {
  min-height: 40px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 750;
  cursor: pointer;
  transition: .16s ease;
}

.button:hover:not(:disabled) { transform: translateY(-1px); }

.button:disabled {
  cursor: not-allowed;
  opacity: .45;
}

.button.primary {
  background: var(--accent);
  color: white;
}

.button.secondary {
  border-color: #cfd5dd;
  background: white;
}

.button.ghost {
  border-color: var(--line);
  background: transparent;
}

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

.note {
  margin: 14px 0;
  padding: 12px 14px;
  border-radius: 12px;
  background: #f3f5f7;
  color: #555e6a;
  font-size: 12px;
  line-height: 1.65;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .95em;
}

.export-groups { display: grid; gap: 10px; }

.export-group {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: white;
  overflow: hidden;
}

.export-group summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 14px;
  cursor: pointer;
}

.export-group summary::-webkit-details-marker { display: none; }

.group-title {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 9px;
}

.group-title strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.group-files {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 8px;
  padding: 0 14px 14px;
}

.download-item {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 10px;
  background: #f7f8fa;
  border-radius: 10px;
  font-size: 12px;
}

.download-item span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.link-button {
  flex: none;
  border: 0;
  background: transparent;
  padding: 5px;
  cursor: pointer;
  color: #334155;
  font-weight: 800;
}

.empty-state {
  min-height: 48px;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 13px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 4px 0;
  color: var(--muted);
  font-size: 12px;
}


.preview-help {
  margin: -4px 0 14px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.preview-card {
  cursor: zoom-in;
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}

.preview-card:hover {
  transform: translateY(-2px);
  border-color: #b8c0cb;
  box-shadow: 0 12px 26px rgba(15, 23, 42, .12);
}

.preview-canvas-wrap {
  position: relative;
}

.preview-canvas-wrap::after {
  content: "点击高清查看";
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 6px 8px;
  border-radius: 8px;
  background: rgba(12, 15, 20, .72);
  color: white;
  font-size: 11px;
  font-weight: 750;
  opacity: 0;
  transform: translateY(4px);
  transition: .16s ease;
  pointer-events: none;
}

.preview-card:hover .preview-canvas-wrap::after {
  opacity: 1;
  transform: translateY(0);
}

.preview-viewer {
  position: fixed;
  inset: 0;
  z-index: 1200;
  background: rgba(7, 10, 15, .88);
  backdrop-filter: blur(8px);
  padding: 18px;
}

.preview-viewer[hidden] {
  display: none;
}

.viewer-shell {
  width: 100%;
  height: 100%;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 18px;
  background: #11151b;
  box-shadow: 0 24px 90px rgba(0,0,0,.5);
}

.viewer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255,255,255,.11);
  background: #171c24;
  color: white;
}

.viewer-title-wrap {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.viewer-title-wrap strong {
  flex: none;
}

.viewer-title-wrap .muted {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #aab3c0;
}

.viewer-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 7px;
  flex-wrap: wrap;
}

.viewer-toolbar .button.secondary {
  background: #222a35;
  color: #eef2f7;
  border-color: #35404f;
}

.viewer-toolbar .button.ghost {
  color: #eef2f7;
  border-color: #35404f;
}

.viewer-btn {
  min-width: 42px;
  padding: 0 10px;
  font-size: 20px;
  line-height: 1;
}

.viewer-zoom-label {
  min-width: 62px;
  text-align: center;
  color: #d5dbe4;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.viewer-stage {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  user-select: none;
  touch-action: none;
  cursor: grab;
  background:
    linear-gradient(45deg, #161b22 25%, transparent 25%),
    linear-gradient(-45deg, #161b22 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #161b22 75%),
    linear-gradient(-45deg, transparent 75%, #161b22 75%),
    #10141a;
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0px;
}

.viewer-stage.dragging {
  cursor: grabbing;
}

.viewer-content {
  position: absolute;
  left: 50%;
  top: 50%;
  transform-origin: 0 0;
  will-change: transform;
}

#viewerCanvas {
  display: block;
  max-width: none;
  max-height: none;
  background: transparent;
  box-shadow: 0 18px 60px rgba(0,0,0,.42);
  pointer-events: none;
}

.viewer-tip {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(10, 13, 18, .72);
  color: rgba(255,255,255,.78);
  font-size: 11px;
  pointer-events: none;
}

@media (max-width: 820px) {
  .preview-viewer { padding: 0; }

  .viewer-shell {
    border-radius: 0;
    border: 0;
  }

  .viewer-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .viewer-controls {
    width: 100%;
    justify-content: flex-start;
  }

  .viewer-title-wrap {
    width: 100%;
  }
}

.busy-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(10, 13, 18, .56);
  backdrop-filter: blur(5px);
  display: grid;
  place-items: center;
  padding: 20px;
}

.busy-overlay[hidden] { display: none; }

.busy-card {
  width: min(440px, 100%);
  background: white;
  border-radius: 18px;
  box-shadow: 0 20px 70px rgba(0,0,0,.3);
  padding: 24px;
  display: grid;
  gap: 13px;
  color: #17191d;
}

.spinner {
  width: 34px;
  height: 34px;
  border: 3px solid #e5e7eb;
  border-top-color: #111827;
  border-radius: 50%;
  animation: spin .75s linear infinite;
}

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

.progress-track {
  height: 8px;
  overflow: hidden;
  background: #eceff3;
  border-radius: 999px;
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: #111827;
  transition: width .14s linear;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 22px;
  z-index: 1000;
  transform: translate(-50%, 20px);
  padding: 10px 14px;
  max-width: min(640px, calc(100% - 32px));
  border-radius: 10px;
  background: #111827;
  color: white;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: .2s ease;
  box-shadow: 0 10px 30px rgba(0,0,0,.22);
}

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

@media (max-width: 760px) {
  .app-shell { width: min(100% - 20px, 1220px); padding-top: 24px; }
  .hero { align-items: flex-start; flex-direction: column; }
  .panel { padding: 16px; }
  .section-head { align-items: flex-start; }
  .field-grid { flex-direction: column; }
  .watermark-input-grid .compact { width: 100%; }
  .controls-grid { grid-template-columns: 1fr; }
  .preview-head { flex-direction: column; }
  .preview-actions { width: 100%; flex-direction: column; align-items: stretch; }
  .inline-field { min-width: 0; }
  .footer { flex-direction: column; }
}