:root {
  --ink: #0b1220;
  --text: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --blue: #2457d6;
  --blue-soft: #eff6ff;
  --bg: #f7f8fb;
  --card: #fff;
  --danger: #b42318;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", Inter, sans-serif;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--blue); text-decoration: none; }

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 16px;
}

.panel {
  width: min(760px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

.panel.narrow { width: min(460px, 100%); }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,0.92);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 850;
  color: var(--ink);
  font-size: 18px;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 24px 80px;
}

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

h1, h2, h3 {
  color: var(--ink);
  line-height: 1.2;
}

h1 { margin: 0 0 10px; font-size: 30px; }
h2 { margin: 0 0 16px; font-size: 22px; }
h3 { margin: 0 0 8px; font-size: 16px; }

.muted { color: var(--muted); }
.danger { color: var(--danger); }
.meta {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

form { display: grid; gap: 14px; margin-top: 18px; }

label {
  display: grid;
  gap: 7px;
  font-weight: 700;
  color: var(--ink);
  font-size: 14px;
}

input, textarea, select {
  width: 100%;
  border: 1px solid #d0d5dd;
  border-radius: 10px;
  padding: 11px 12px;
  font: inherit;
  background: #fff;
}

textarea { min-height: 220px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

button, .button {
  border: 0;
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  font-weight: 800;
  padding: 11px 14px;
  cursor: pointer;
  display: inline-flex;
  justify-content: center;
  align-items: center;
}

.stack {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.button.secondary, button.secondary {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}

.card:hover { border-color: var(--blue); }

.stat {
  font-size: 28px;
  font-weight: 850;
  color: var(--ink);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

th, td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

th { color: var(--ink); background: #f3f6fb; }
tr:last-child td { border-bottom: 0; }

.reader-layout {
  height: calc(100vh - 61px);
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
}

.reader-side {
  border-right: 1px solid var(--line);
  background: #fff;
  padding: 18px;
  overflow: auto;
}

.reader-frame-wrap {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.reader-frame {
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

.watermark {
  position: absolute;
  inset: 0;
  pointer-events: none;
  user-select: none;
  overflow: hidden;
  z-index: 100;
  background-image: repeating-linear-gradient(
    -45deg,
    transparent 0px,
    transparent 140px,
    rgba(0,0,0,0.03) 140px,
    rgba(0,0,0,0.03) 141px
  );
}

.watermark::after {
  content: attr(data-text);
  display: none;
}

/* 用 JS 生成水印 tile，CSS 负责样式 */
.watermark-tile {
  position: absolute;
  font-size: 13px;
  font-weight: 600;
  color: rgba(0, 0, 0, 0.10);
  white-space: nowrap;
  transform: rotate(-30deg);
  letter-spacing: 0.03em;
  pointer-events: none;
  user-select: none;
}

.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 18px 0;
}

.tabs a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
}

.upload-item {
  background: #f9fafb;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
}

.upload-item-fields {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.upload-item-fields input {
  padding: 8px 10px;
  font-size: 13px;
}

@media (max-width: 860px) {
  .upload-item-fields { grid-template-columns: 1fr; }
}

.dropzone {
  border: 2px dashed var(--line);
  border-radius: 10px;
  padding: 32px 20px;
  text-align: center;
  background: #f9fafb;
  transition: border-color 0.15s, background 0.15s;
  cursor: default;
}

.dropzone.dragover {
  border-color: var(--blue);
  background: var(--blue-soft);
}

.dropzone-hint {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.dropzone-pick {
  color: var(--blue);
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
}

@media (max-width: 860px) {
  .page-head { display: grid; }
  .grid { grid-template-columns: 1fr; }
  .reader-layout { grid-template-columns: 1fr; }
  .reader-side { display: none; }
  .reader-frame-wrap { height: calc(100vh - 61px); }
  table {
    display: block;
    overflow-x: auto;
  }
}