:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #e6e8ee;
  --text: #1f2430;
  --text-2: #667085;
  --text-3: #98a2b3;
  --primary: #3b6ef5;
  --primary-weak: #eef2ff;
  --q1: #e5484d; /* 重要紧急 */
  --q2: #3b6ef5; /* 重要不紧急 */
  --q3: #f5a524; /* 紧急不重要 */
  --q4: #98a2b3; /* 不重要不紧急 */
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-lg: 0 8px 24px rgba(16, 24, 40, 0.10);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
}

.hidden { display: none !important; }

/* ===== 登录页 ===== */
#view-login {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, #eef2ff 0%, #f5f6f8 60%);
}
.login-card {
  background: var(--card); border-radius: 16px; box-shadow: var(--shadow-lg);
  padding: 32px; width: 360px; max-width: 92vw;
}
.login-brand { font-size: 20px; font-weight: 700; text-align: center; }
.login-sub { color: var(--text-2); text-align: center; margin: 6px 0 20px; font-size: 13px; }
.login-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.login-tabs button {
  flex: 1; padding: 8px; border: 1px solid var(--border); background: var(--bg);
  border-radius: 8px; cursor: pointer; color: var(--text-2); font-size: 14px;
}
.login-tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.login-card input {
  width: 100%; padding: 11px 12px; margin-bottom: 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 14px; outline: none;
}
.login-card input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-weak); }
.login-msg { color: var(--q1); font-size: 13px; min-height: 18px; margin: 8px 0; text-align: center; }
.login-hint { color: var(--text-3); font-size: 12px; text-align: center; margin-top: 12px; }

/* ===== 顶栏 ===== */
.topbar {
  position: sticky; top: 0; z-index: 10; background: var(--card);
  border-bottom: 1px solid var(--border); padding: 10px 20px;
  display: flex; align-items: center; gap: 16px;
}
.brand { font-weight: 700; font-size: 16px; white-space: nowrap; }
.nav { display: flex; gap: 4px; }
.nav-btn {
  padding: 7px 14px; border: none; background: transparent; cursor: pointer;
  border-radius: 8px; color: var(--text-2); font-size: 14px;
}
.nav-btn.active { background: var(--primary-weak); color: var(--primary); font-weight: 600; }
.search {
  flex: 1; max-width: 320px; padding: 8px 12px; border: 1px solid var(--border);
  border-radius: 8px; outline: none; font-size: 13px;
}
.search:focus { border-color: var(--primary); }
.user-box { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.user-name { color: var(--text-2); font-size: 13px; }
.link-btn { border: none; background: none; color: var(--text-3); cursor: pointer; font-size: 13px; }
.link-btn:hover { color: var(--primary); }

/* ===== 视图容器 ===== */
.view-content { padding: 20px; max-width: 1280px; margin: 0 auto; }

/* ===== 总览双栏 ===== */
.overview-grid { display: grid; grid-template-columns: 380px 1fr; gap: 16px; align-items: start; }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel-head {
  padding: 14px 16px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
}
.panel-head h2 { font-size: 15px; font-weight: 600; }

/* ===== 列表 ===== */
.list { padding: 8px; display: flex; flex-direction: column; gap: 8px; max-height: 72vh; overflow-y: auto; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px; cursor: pointer; transition: box-shadow .15s, border-color .15s;
}
.card:hover { box-shadow: var(--shadow-lg); border-color: #cdd5e1; }
.card-title { font-weight: 600; font-size: 14px; margin-bottom: 4px; word-break: break-word; }
.card-excerpt { color: var(--text-2); font-size: 13px; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.card-meta { display: flex; align-items: center; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.tag { background: var(--primary-weak); color: var(--primary); border-radius: 5px; padding: 1px 7px; font-size: 11px; }
.badge-ai { background: #fff3e6; color: #e8740c; border-radius: 5px; padding: 1px 7px; font-size: 11px; }
.empty { color: var(--text-3); text-align: center; padding: 30px 10px; font-size: 13px; }

/* ===== 四象限 ===== */
.quadrant { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 12px; }
.quadrant-full { min-height: 60vh; }
.q-cell { border-radius: 10px; border: 1px solid var(--border); background: #fafbfc; overflow: hidden; display: flex; flex-direction: column; }
.q-head { padding: 10px 12px; color: #fff; font-size: 13px; font-weight: 600; display: flex; justify-content: space-between; align-items: center; }
.q1 .q-head { background: var(--q1); }
.q2 .q-head { background: var(--q2); }
.q3 .q-head { background: var(--q3); }
.q4 .q-head { background: var(--q4); }
.q-count { background: rgba(255,255,255,.28); border-radius: 10px; padding: 0 8px; font-size: 12px; }
.q-body { padding: 8px; display: flex; flex-direction: column; gap: 6px; flex: 1; min-height: 60px; }
.todo-chip {
  background: #fff; border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 10px; cursor: pointer; font-size: 13px; word-break: break-word;
}
.todo-chip:hover { border-color: var(--primary); }
.todo-chip .chip-title { font-weight: 500; }
.todo-chip .chip-deadline { font-size: 11px; color: var(--text-3); margin-top: 2px; }
.todo-chip.overdue .chip-deadline { color: var(--q1); }
.todo-chip.done { opacity: .55; text-decoration: line-through; }

/* ===== 详情页 ===== */
.detail-wrap { max-width: 760px; margin: 0 auto; }
.detail-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-bottom: 16px; }
.detail-original { border-left: 3px solid var(--primary); padding: 4px 0 4px 14px; }
.detail-original .orig-label { color: var(--text-3); font-size: 12px; letter-spacing: 1px; margin-bottom: 6px; }
.detail-original .orig-content { white-space: pre-wrap; word-break: break-word; color: var(--text); }
.detail-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.detail-actions { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.back-btn { border: none; background: none; color: var(--text-2); cursor: pointer; font-size: 14px; padding: 4px 0; margin-bottom: 12px; }
.back-btn:hover { color: var(--primary); }

/* AI 折叠面板 */
.ai-section { margin-top: 16px; }
.ai-section h3 { font-size: 14px; color: var(--text-2); margin-bottom: 10px; }
.ai-item { border: 1px solid var(--border); border-radius: 10px; margin-bottom: 10px; overflow: hidden; }
.ai-item-head {
  padding: 10px 14px; background: #fafbfc; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.ai-item-head .ai-time { color: var(--text-3); font-size: 12px; }
.ai-status { font-size: 12px; border-radius: 5px; padding: 1px 8px; }
.ai-status.unread { background: var(--primary-weak); color: var(--primary); }
.ai-status.read { background: #f2f4f7; color: var(--text-3); }
.ai-status.adopted { background: #e7f7ec; color: #12a150; }
.ai-status.discarded { background: #f2f4f7; color: var(--text-3); text-decoration: line-through; }
.ai-item-body { padding: 14px; border-top: 1px solid var(--border); white-space: pre-wrap; word-break: break-word; font-size: 13px; }
.ai-item-body.collapsed { display: none; }
.ai-item-actions { display: flex; gap: 8px; padding: 0 14px 12px; flex-wrap: wrap; }
.ai-loading { color: var(--text-3); font-size: 13px; padding: 8px 0; }

/* ===== 按钮 ===== */
.btn-primary {
  background: var(--primary); color: #fff; border: none; border-radius: 8px;
  padding: 9px 16px; cursor: pointer; font-size: 14px; font-weight: 500;
}
.btn-primary:hover { opacity: .9; }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 7px; }
.btn-ghost {
  background: #fff; color: var(--text-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 9px 16px; cursor: pointer; font-size: 14px;
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-xs { padding: 4px 10px; font-size: 12px; border-radius: 6px; }
.btn-danger-ghost { background: #fff; color: var(--q1); border: 1px solid #f2c4c6; border-radius: 8px; padding: 9px 14px; cursor: pointer; font-size: 13px; }
.btn-danger-ghost:hover { background: #fef2f2; }

/* ===== 弹窗 ===== */
.modal {
  position: fixed; inset: 0; background: rgba(16,24,40,.45); z-index: 100;
  display: flex; align-items: center; justify-content: center; padding: 16px;
}
.modal-card {
  background: var(--card); border-radius: 14px; padding: 22px; width: 480px;
  max-width: 94vw; max-height: 90vh; overflow-y: auto;
}
.modal-card h3 { margin-bottom: 16px; font-size: 16px; }
.field-label { display: block; font-size: 13px; color: var(--text-2); margin: 12px 0 6px; }
.modal-card input, .modal-card textarea, .modal-card select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 14px; outline: none; font-family: inherit;
}
.modal-card input:focus, .modal-card textarea:focus, .modal-card select:focus { border-color: var(--primary); }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: #1f2430; color: #fff; padding: 10px 18px; border-radius: 8px;
  font-size: 13px; z-index: 200; box-shadow: var(--shadow-lg);
}

/* ===== 响应式（手机单栏） ===== */
@media (max-width: 860px) {
  .overview-grid { grid-template-columns: 1fr; }
  .search { display: none; }
  .topbar { padding: 10px 12px; gap: 8px; }
  .brand { font-size: 14px; }
  .view-content { padding: 12px; }
  .quadrant { grid-template-columns: 1fr; }
  .list { max-height: none; }
}