:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --line: #e5e9f0;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --danger: #dc2626;
  --ok: #059669;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16, 24, 40, 0.04);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand { font-weight: 700; font-size: 18px; display: flex; align-items: center; gap: 8px; }
.brand .logo { color: var(--accent); }
.brand small { color: var(--muted); font-weight: 400; font-size: 12px; margin-left: 6px; }
.spacer { flex: 1; }
.pill {
  background: #eef2ff;
  color: var(--accent-dark);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 600;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 9px;
  padding: 7px 14px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}
.btn:hover { border-color: #c7d2fe; background: #f5f7ff; text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-dark); }
.btn.danger { color: var(--danger); }
.btn.danger:hover { background: #fef2f2; border-color: #fecaca; }
.btn.small { padding: 4px 10px; font-size: 13px; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 24px 20px 60px; }

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

/* ---- 登录 ---- */
.login-box { max-width: 420px; margin: 10vh auto 0; }
.login-box h1 { margin: 0 0 6px; font-size: 22px; }
.login-box p.hint { color: var(--muted); margin: 0 0 18px; font-size: 13px; }

label.field { display: block; margin: 0 0 14px; font-size: 13px; color: var(--muted); }
input[type="text"], input[type="email"], input[type="password"], textarea, select {
  width: 100%;
  margin-top: 5px;
  border: 1px solid #d3dae6;
  border-radius: 8px;
  padding: 9px 11px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: #fff;
}
textarea { resize: vertical; min-height: 70px; }
input:focus, textarea:focus, select:focus { outline: 2px solid #bfdbfe; border-color: var(--accent); }

/* ---- 工具栏 ---- */
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; align-items: center; }
.toolbar input[type="text"] { width: 260px; margin: 0; }
.toolbar select { width: auto; margin: 0; }

/* ---- 数据集卡片 ---- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.dscard {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.15s, border-color 0.15s;
}
.dscard:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(16,24,40,0.10); border-color: #c7d2fe; }
.dscard h3 { margin: 0 0 6px; font-size: 16px; }
.dscard .meta { color: var(--muted); font-size: 13px; display: flex; flex-wrap: wrap; gap: 4px 12px; margin: 6px 0; }
.tag {
  display: inline-block;
  background: #f0f4ff;
  color: #3730a3;
  border: 1px solid #dbe3ff;
  border-radius: 6px;
  padding: 0 8px;
  font-size: 12px;
  line-height: 1.7;
}
.tag.gray { background: #f3f4f6; color: #4b5563; border-color: #e5e7eb; }
.dscard .desc {
  color: #4b5563;
  font-size: 13px;
  margin: 8px 0 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.6em;
}
.dscard .foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  color: var(--muted);
  font-size: 12px;
}
.empty { color: var(--muted); text-align: center; padding: 60px 0; }

/* ---- 模态框 ---- */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  z-index: 50;
  overflow-y: auto;
}
.overlay.open { display: flex; }
.modal {
  background: #fff;
  border-radius: 16px;
  max-width: 720px;
  width: 100%;
  padding: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
.modal h2 { margin: 0 0 4px; }
.modal .close-x { float: right; border: 0; background: none; font-size: 22px; cursor: pointer; color: var(--muted); }

.kv { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 6px 18px; margin: 12px 0; font-size: 14px; }
.kv b { color: var(--muted); font-weight: 500; margin-right: 6px; }

.file-table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 10px 0; }
.file-table th, .file-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.file-table th { color: var(--muted); font-weight: 500; font-size: 12px; }
.file-name { word-break: break-all; max-width: 240px; }
.file-actions { white-space: nowrap; text-align: right; }

.msg { border-radius: 9px; padding: 10px 14px; font-size: 14px; margin: 10px 0; display: none; }
.msg.show { display: block; }
.msg.ok { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.msg.err { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.msg.info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }

.email-form { background: #f9fafb; border: 1px dashed #d3dae6; border-radius: 10px; padding: 14px; margin-top: 10px; display: none; }
.email-form.open { display: block; }
.email-form .row { display: flex; gap: 8px; }
.email-form input { margin: 0; }

/* ---- 上传页 ---- */
.upload-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
@media (max-width: 760px) { .upload-grid { grid-template-columns: 1fr; } }
.upload-grid .col h3 { margin: 0 0 12px; font-size: 15px; }

.dropzone {
  border: 2px dashed #c3cbd9;
  border-radius: 12px;
  padding: 28px 16px;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  background: #fbfcfe;
  transition: all 0.15s;
}
.dropzone.drag { border-color: var(--accent); background: #eff6ff; }
.dropzone b { color: var(--accent); }

.file-row {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  margin-top: 10px;
  background: #fff;
}
.file-row .fname { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.file-row .fsize { color: var(--muted); font-size: 12px; white-space: nowrap; }
.file-row .rm { color: var(--danger); background: none; border: 0; cursor: pointer; font-size: 16px; }
.progress { height: 6px; background: #eef1f6; border-radius: 4px; overflow: hidden; margin-top: 6px; }
.progress > i { display: block; height: 100%; width: 0%; background: var(--accent); transition: width 0.2s; }
.file-row .st { font-size: 12px; white-space: nowrap; min-width: 64px; text-align: right; color: var(--muted); }
.file-row.done .st { color: var(--ok); }
.file-row.fail .st { color: var(--danger); }

.form-actions { display: flex; gap: 10px; margin-top: 18px; }

/* ---- 下载落地页 ---- */
.dpage { max-width: 640px; margin: 8vh auto 0; text-align: center; }
.dpage .files { text-align: left; margin: 18px 0; }
.dpage .meta-tags { margin: 10px 0 4px; }
.dpage .big-btn { font-size: 16px; padding: 12px 28px; }

.hidden { display: none !important; }
.muted { color: var(--muted); }
.errpage { text-align: center; padding: 80px 20px; }
.errpage .code { font-size: 60px; font-weight: 800; color: #d3dae6; }