:root{
  --bg:#f4f5fb;
  --panel:#ffffff;
  --text:#1f2430;
  --muted:#6f7585;
  --border:rgba(15,23,42,.08);
  --shadow:0 10px 24px rgba(15,23,42,.06);
  --primary:#2563eb;
  --primary-soft:#e0edff;
  --danger:#e11d48;
  --danger-soft:#fee2e2;
  --radius-lg:16px;
}

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

.container{max-width:1100px;margin:0 auto;padding:0 18px}
.main{padding:22px 0 34px}

.topbar{
  position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.94);
  border-bottom:1px solid rgba(148,163,184,.20);
  backdrop-filter: blur(8px);
}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}

.brand{display:flex;align-items:center;gap:12px}
.brand__logo{
  width:36px;height:36px;border-radius:12px;
  background:var(--primary-soft);
  display:grid;place-items:center;
  font-weight:800;color:var(--primary);
  box-shadow:none;
}
.brand__name{font-weight:800;letter-spacing:.2px}
.brand__desc{color:var(--muted);font-size:12px;margin-top:2px}

.nav{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
.nav__btn{
  appearance:none;border:1px solid transparent;
  background:transparent;
  color:var(--muted);
  padding:8px 10px;border-radius:10px;
  cursor:pointer;
}
.nav__btn.is-active{
  border-color:rgba(37,99,235,.25);
  background:var(--primary-soft);
  color:var(--primary);
}
.nav__sep{width:1px;height:22px;background:var(--border);margin:0 4px}
.nav__auth{display:flex;align-items:center;gap:10px}
.nav__user{color:var(--muted);font-size:13px}

.view{display:flex;flex-direction:column;gap:14px}
.is-hidden{display:none !important}

.card{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.card__header{padding:18px 18px 0}
.card__title{margin:0 0 6px;font-size:18px}
.card__subtitle{margin:0 0 14px;color:var(--muted);font-size:13px;line-height:1.5}

.form{padding:0 18px 18px;display:flex;flex-direction:column;gap:12px}
.form__row{display:flex;gap:10px;flex-wrap:wrap}
.field{display:flex;flex-direction:column;gap:6px}
.field--inline{flex-direction:row;align-items:center;gap:10px}
.field__label{color:var(--muted);font-size:13px}

.input,.select{
  width:100%;
  background:#f9fafb;
  border:1px solid var(--border);
  color:var(--text);
  padding:10px 12px;
  border-radius:12px;
  outline:none;
}
.input:focus,.select:focus{border-color:rgba(76,195,255,.45);box-shadow:0 0 0 3px rgba(76,195,255,.10)}
.select{cursor:pointer}

.btn{
  appearance:none;border:1px solid rgba(148,163,184,.4);
  background:#ffffff;
  color:var(--text);
  padding:10px 12px;
  border-radius:12px;
  cursor:pointer;
  transition: transform .05s ease, background .15s ease, border-color .15s ease;
}
.btn:active{transform: translateY(1px)}
.btn--primary{
  border-color:rgba(37,99,235,.9);
  background:var(--primary);
  color:#ffffff;
  font-weight:600;
}
.btn--ghost{background:transparent}
.btn--danger{border-color:rgba(248,113,113,.7);color:var(--danger)}
.btn--soft{background:var(--danger-soft)}
.w-full{width:100%}

.hint{display:flex;align-items:flex-start;gap:10px;color:var(--muted);font-size:13px;line-height:1.5}
.hint__dot{width:9px;height:9px;border-radius:99px;background:rgba(58,210,159,.85);margin-top:6px;box-shadow:0 0 0 4px rgba(58,210,159,.12)}

.questions,.notes{padding:0 18px 18px;display:flex;flex-direction:column;gap:10px}
.qItem{
  border:1px solid var(--border);
  background:#f9fafb;
  border-radius:12px;
  padding:12px 12px;
  display:flex;
  flex-direction: column;
  gap:12px;
  align-items:flex-start;
}
.qItem__meta{display:flex;flex-direction:column;gap:6px;min-width:0}
.tagRow{display:flex;gap:8px;flex-wrap:wrap}
.tag{
  font-size:12px;color:var(--muted);
  border:1px solid var(--border);
  background:#ffffff;
  padding:4px 8px;border-radius:999px;
}
.tag--job{border-color: rgba(37,99,235,.35); background: var(--primary-soft);color:var(--primary)}
.tag--fav{border-color: rgba(22,163,74,.35); background: #dcfce7;color:#166534}
.qItem__title{margin:0;font-size:14px;line-height:1.6;word-break:break-word}
.qItem__actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-start}
.btnSmall{padding:8px 10px;border-radius:12px;font-size:13px}

.emptyState{
  padding:14px;
  border:1px dashed rgba(148,163,184,.45);
  border-radius:16px;
  color:var(--muted);
  background:#f9fafb;
}
.emptyState__title{color:var(--text);font-weight:800;margin-bottom:6px}
.emptyState__desc{font-size:13px;line-height:1.5}

/* 实用工具类 */
.text-primary{color: var(--primary)}
.text-danger{color: var(--danger)}
.text-success{color: #15803d}
.text-warning{color: #ea580c}
.text-bold{font-weight: 600}
.text-large{font-size: 16px}
.text-small{font-size: 12px}

.notesToolbar{
  padding:0 18px 12px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap
}

.footer{
  padding:18px 0 26px;
  border-top:1px solid rgba(148,163,184,.25);
  background:#f9fafb;
}
.footer__inner{display:flex;gap:10px;align-items:center;justify-content:center;color:var(--muted);font-size:13px;flex-wrap:wrap}
.footer__sep{opacity:.5}
.muted{color:var(--muted)}
.small{font-size:12px}

/* 自定义链接样式 */
.link{
  color: var(--primary);
  text-decoration: none;
  cursor: pointer;
  transition: opacity .15s ease;
}
.link:hover{
  opacity: .8;
  text-decoration: underline;
}

.modal{
  position:fixed;inset:0;display:grid;place-items:center;z-index:50;
}
.modal__backdrop{position:absolute;inset:0;background:rgba(0,0,0,.60)}
.modal__panel{
  position:relative;
  width:min(520px, calc(100vw - 28px));
  border-radius:var(--radius-lg);
  background:#ffffff;
  border:1px solid rgba(148,163,184,.45);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.modal__header{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px 16px;border-bottom:1px solid var(--border)}
.modal__title{margin:0;font-size:16px}
.iconBtn{
  appearance:none;border:1px solid var(--border);
  background:rgba(255,255,255,.04);
  color:var(--text);
  padding:8px 10px;border-radius:12px;
  cursor:pointer;
}
.modal__body{padding:14px 16px}
.modal__footer{padding:12px 16px;border-top:1px solid var(--border)}

.tabs{display:flex;gap:8px;padding:12px 16px 0}
.tabs__tab{
  flex:1;
  appearance:none;border:1px solid var(--border);
  background:#f9fafb;
  color:var(--muted);
  padding:10px 12px;border-radius:12px;
  cursor:pointer;
}
.tabs__tab.is-active{
  border-color: rgba(37,99,235,.7);
  background:#ffffff;
  color:var(--primary);
}
.form__msg{min-height:18px;color:var(--muted);font-size:13px}
.form__msg.is-error{color: #ffd7de}
.form__msg.is-success{color: #15803d}

/* 历史记录样式 */
.historyToolbar{
  padding:0 18px 12px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap
}

.history{
  padding:0 18px 18px;
  display:flex;flex-direction:column;gap:12px
}

.historyItem{
  border:1px solid var(--border);
  background:#f9fafb;
  border-radius:12px;
  padding:14px;
  display:flex;flex-direction:column;gap:10px
}

.historyItem__header{
  display:flex;align-items:center;justify-content:space-between;gap:10px
}

.historyItem__meta{
  display:flex;flex-direction:column;gap:4px
}

.historyItem__job{
  font-weight:600;color:var(--primary);font-size:14px
}

.historyItem__time{
  color:var(--muted);font-size:12px
}

.historyItem__desc{
  padding:8px 12px;
  background:#ffffff;
  border-radius:8px;
  border:1px solid rgba(148,163,184,.15);
  font-size:13px;line-height:1.5
}

.historyItem__questions{
  display:flex;flex-direction:column;gap:8px
}

.questionItem{
  padding:10px 12px;
  background:#ffffff;
  border-radius:8px;
  border:1px solid rgba(148,163,184,.15)
}

.questionItem__type{
  font-weight:600;color:var(--primary);font-size:12px;margin-bottom:4px
}

.questionItem__text{
  font-size:13px;line-height:1.5;color:var(--text)
}

/* 示例答案样式 */
.qItem__answer, .questionItem__answer {
  margin-top: 12px;
  padding: 12px;
  background: #f8fafc;
  border: 1px solid rgba(148,163,184,.2);
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.6;
}

.answerHeader {
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
}

.answerContent {
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

/* 历史记录页面中的答案按钮样式 */
.questionItem .btn {
  margin-top: 8px;
  font-size: 12px;
  padding: 6px 10px;
}

/* 首页和学习笔记页面中的按钮样式 */
.qItem__actions {
  margin-top: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.qItem__actions .btn {
  font-size: 12px;
  padding: 6px 10px;
}

@media (max-width: 520px){
  .brand__desc{display:none}
  .nav__sep{display:none}
  
  .historyItem__header{
    flex-direction:column;align-items:flex-start;gap:8px
  }
  
  .historyToolbar{
    flex-direction:column;align-items:stretch
  }
}

/* 模态对话框样式 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  padding: 30px;
  text-align: center;
  min-width: 300px;
  max-width: 90vw;
}

.modal-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}