/* 读书会签到表合并工具 — 样式 */
:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --border: #e4e8f0;
  --text: #1f2430;
  --text-muted: #6b7280;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --amber-bg: #fff7e0;
  --amber-border: #f5d878;
  --amber-text: #7a5b00;
  --danger-bg: #fdecec;
  --danger-border: #f0b4b4;
  --danger-text: #a01d1d;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 6px 20px rgba(16, 24, 40, .05);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

/* 页头 */
.page-header { text-align: center; margin-bottom: 20px; }
.page-header h1 { font-size: 26px; margin: 0 0 6px; letter-spacing: .5px; }
.page-header .subtitle { color: var(--text-muted); margin: 0; font-size: 14px; }

/* 隐私提示条 */
.privacy-banner {
  background: var(--amber-bg);
  border: 1px solid var(--amber-border);
  color: var(--amber-text);
  border-radius: 12px;
  padding: 12px 16px;
  text-align: center;
  font-size: 15px;
  margin-bottom: 20px;
}

/* 错误提示 */
.error-box {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 14px;
  margin-bottom: 20px;
  white-space: pre-wrap;
}

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.step-title { display: flex; align-items: center; gap: 10px; font-size: 18px; margin: 0 0 16px; }
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--primary); color: #fff; font-size: 14px; font-weight: 600;
}

/* 上传区 */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: 14px;
  padding: 44px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--primary); background: #f7f7ff; outline: none; }
.dropzone.dragover { border-color: var(--primary); background: #eef0ff; }
.dropzone-icon { font-size: 42px; line-height: 1; margin-bottom: 10px; }
.dropzone-text { margin: 0 0 4px; font-size: 15px; }
.dropzone .link { color: var(--primary); text-decoration: underline; }
.dropzone-hint { margin: 0; color: var(--text-muted); font-size: 12px; }

.file-info {
  margin-top: 14px; padding: 12px 16px; background: #f7f8fc;
  border: 1px solid var(--border); border-radius: 10px; font-size: 14px;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.file-info .file-icon { font-size: 20px; }
.file-info .file-name { font-weight: 600; word-break: break-all; }

/* 期数概览 */
.sessions-summary { margin: 0 0 12px; font-size: 14px; color: var(--text-muted); }
.sessions-summary strong { color: var(--text); }

.range-row { display: flex; align-items: flex-end; gap: 16px; margin-bottom: 8px; flex-wrap: wrap; }
.range-label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--text-muted); }
.range-label select {
  min-width: 150px; padding: 9px 12px; font-size: 15px;
  border: 1px solid var(--border); border-radius: 10px; background: #fff;
  color: var(--text); cursor: pointer;
}
.range-label select:focus { outline: 2px solid var(--primary); outline-offset: 0; border-color: transparent; }
.range-arrow { font-size: 20px; color: var(--text-muted); padding-bottom: 8px; }

.hint { font-size: 12px; color: var(--text-muted); margin: 6px 0 14px; }
.warnings { font-size: 13px; color: var(--danger-text); background: var(--danger-bg);
  border: 1px solid var(--danger-border); border-radius: 10px; padding: 10px 14px; margin: 0 0 14px; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 10px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: background .15s, border-color .15s;
}
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-hover); }
.btn.primary:disabled { background: #a5a3d8; cursor: not-allowed; }
.btn.ghost { background: #fff; color: var(--text); border-color: var(--border); }
.btn.ghost:hover { border-color: var(--primary); color: var(--primary); }

/* 处理中 */
.processing { text-align: center; padding: 40px 0; }
.processing p { color: var(--text-muted); margin: 16px 0 0; }
.spinner {
  width: 46px; height: 46px; margin: 0 auto;
  border: 4px solid var(--border); border-top-color: var(--primary);
  border-radius: 50%; animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 结果 */
.result-meta { font-size: 14px; color: var(--text-muted); margin: 0 0 14px; }
.result-meta strong { color: var(--text); }
.result-actions { display: flex; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }

.preview-wrap {
  max-height: 460px; overflow: auto;
  border: 1px solid var(--border); border-radius: 12px;
}
.preview-table { border-collapse: collapse; width: 100%; font-size: 13px; min-width: 640px; }
.preview-table th, .preview-table td {
  border: 1px solid var(--border); padding: 8px 10px; text-align: left;
  white-space: normal; word-break: break-word; vertical-align: top;
}
.preview-table thead th {
  position: sticky; top: 0; z-index: 1;
  background: #f1f0ff; color: var(--text); font-weight: 600; white-space: nowrap;
}
.preview-table tbody tr:nth-child(even) { background: #fafbff; }

/* 页脚 */
.page-footer { text-align: center; color: var(--text-muted); font-size: 12px; margin-top: 8px; }

@media (max-width: 640px) {
  .container { padding: 18px 12px 40px; }
  .card { padding: 18px; }
  .dropzone { padding: 30px 12px; }
}