:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --border: rgba(60, 60, 67, 0.12);
  --text: #1d1d1f;
  --muted: #6e6e73;
  --primary: #0071e3;
  --mentor-max: 680px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.site-header {
  padding: 24px 16px;
  text-align: left;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.site-header h1 { margin: 0 0 6px; }
.site-header p { margin: 0; color: var(--muted); }
.auth-bar { margin-top: 14px; max-width: 960px; margin-left: auto; margin-right: auto; }
.auth-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: center;
}
.auth-row input { min-width: 120px; max-width: 180px; }
.auth-hint { margin-top: 10px; font-size: 13px; color: var(--muted); }
.hidden { display: none !important; }
.btn-secondary { background: #5b6475 !important; }
.card-actions { margin-top: 10px; display: flex; gap: 8px; align-items: center; }
.card-actions button { min-width: 72px; height: 34px; font-size: 13px; }
.muted { color: var(--muted); font-size: 13px; }
.btn-fav { background: #2d7a4d !important; }
.container { max-width: 1100px; margin: 0 auto; padding: 16px; }
.controls, .status, .results { background: var(--card); border: 1px solid var(--border); border-radius: 12px; }
.controls { padding: 12px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.row:last-child { margin-bottom: 0; }
label { display: flex; flex-direction: column; gap: 6px; color: var(--muted); font-size: 14px; min-width: 140px; }
label.grow { flex: 1; min-width: 240px; }
input, select, button {
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 10px;
  font-size: 14px;
}
button { background: var(--primary); color: #fff; border: none; cursor: pointer; min-width: 88px; }
button:hover { opacity: 0.92; }
.status { margin-top: 12px; padding: 10px 12px; color: var(--muted); }
.results { margin-top: 12px; padding: 12px; }
.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 10px;
}
.card:last-child { margin-bottom: 0; }
.term { margin: 0 0 4px; font-size: 20px; }
.term-cn { margin: 0 0 10px; color: #2f3544; }
.meta { color: var(--muted); font-size: 13px; margin-bottom: 8px; }
.def p { margin: 6px 0; line-height: 1.5; }
.illus { margin-top: 10px; max-width: 320px; width: 100%; border-radius: 8px; border: 1px solid var(--border); }
.empty { color: var(--muted); padding: 8px; }
@media (max-width: 680px) {
  .container { padding: 10px; }
  label { min-width: 100%; }
}

/* —— 顶栏分段切换（词典 | 学姐辅导） —— */
.segmented-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 16px 8px;
}
.segmented {
  display: inline-flex;
  vertical-align: middle;
  background: rgba(118, 118, 128, 0.12);
  border-radius: 9px;
  padding: 2px;
  gap: 0;
}
.segment {
  border: none;
  background: transparent;
  padding: 8px 22px;
  border-radius: 7px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  -webkit-appearance: none;
  appearance: none;
}
.segment:hover {
  color: var(--text);
  opacity: 0.85;
}
.segment-active {
  background: var(--card);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
}

.view {
  display: none;
}
.view.view-active {
  display: block;
}

/* —— 学姐辅导页 —— */
.mentor-page {
  padding: 8px 16px 56px;
}
.mentor-inner {
  max-width: var(--mentor-max);
  margin: 0 auto;
}
.site-tagline {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}
.mentor-kicker {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 8px;
}
.mentor-title {
  font-size: clamp(1.5rem, 4vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0 0 12px;
  color: var(--text);
}
.mentor-subtitle {
  font-size: 1.125rem;
  font-weight: 500;
  margin: 0 0 20px;
  color: var(--text);
}
.mentor-highlights {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
}
.mentor-highlights li {
  font-size: 15px;
  line-height: 1.55;
  margin-bottom: 8px;
  padding-left: 0;
  color: var(--text);
}
.mentor-highlights strong {
  font-weight: 600;
}
.mentor-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
  margin-top: 8px;
}
@media (max-width: 640px) {
  .mentor-hero-grid {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }
  .mentor-footer-qr {
    flex-direction: column !important;
    align-items: center !important;
    text-align: center !important;
  }
}
.mentor-photo-wrap {
  margin: 0;
}
.mentor-photo {
  width: 100%;
  max-width: 280px;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}
.mentor-qr-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}
.mentor-qr {
  width: 200px;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.mentor-qr-large {
  flex-shrink: 0;
}
.mentor-qr-caption {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}
.mentor-qr-note {
  margin: 0;
  font-size: 15px;
}
.mentor-qr-sub {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.45;
}

.mentor-section {
  margin-top: 44px;
  padding-top: 36px;
  border-top: 1px solid var(--border);
}
.mentor-section:first-of-type {
  border-top: none;
  padding-top: 0;
}
.mentor-h3 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  color: var(--text);
}
.mentor-note p,
.mentor-social p {
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  margin: 0 0 14px;
}
.mentor-lead {
  font-size: 17px;
  line-height: 1.5;
  margin-bottom: 16px !important;
}
.mentor-pull {
  font-size: 17px;
  line-height: 1.55;
  padding: 16px 18px;
  margin: 20px 0 !important;
  background: rgba(0, 113, 227, 0.06);
  border-radius: 12px;
  border-left: 4px solid var(--primary);
}
.mentor-cards {
  display: grid;
  gap: 12px;
}
@media (min-width: 560px) {
  .mentor-cards {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }
}
.mentor-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 18px 16px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
.mentor-card-title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}
.mentor-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--muted);
}
.mentor-list {
  margin: 0;
  padding-left: 1.2em;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
}
.mentor-list li {
  margin-bottom: 8px;
}
.mentor-list-tight li {
  margin-bottom: 6px;
}
.mentor-brand {
  font-size: 1.05em;
  color: var(--text);
}
.mentor-footer-qr {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
  margin-top: 24px;
  padding-top: 8px;
}

/* ----- Header：登录 / 昵称 ----- */
.header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}
.site-brand h1 {
  margin: 0 0 4px;
}
.auth-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 15px;
}
.auth-sep {
  color: var(--muted);
  user-select: none;
}
.user-nickname {
  font-weight: 600;
  color: var(--text);
  margin-right: 4px;
}
.btn-text {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 15px;
  padding: 6px 8px;
  border-radius: 8px;
}
.btn-text:hover {
  background: rgba(0, 0, 0, 0.04);
  color: var(--text);
}
.text-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.text-link:hover {
  text-decoration: underline;
}

/* ----- 登录 / 注册 ----- */
.auth-page.narrow {
  max-width: 440px;
}
.auth-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px 32px;
  margin-top: 8px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}
.auth-title {
  margin: 0 0 8px;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.auth-subtitle {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}
.auth-section-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.auth-form .field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}
.field-label {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}
.field-hint {
  font-size: 13px;
  color: var(--muted);
  margin-top: -2px;
}
.field-error {
  color: #b42318;
  font-size: 14px;
  margin: 0 0 8px;
}
.btn-primary-wide {
  width: 100%;
  margin-top: 8px;
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  background: #3d7a6e;
  color: #fff;
  cursor: pointer;
}
.btn-primary-wide:hover {
  opacity: 0.94;
}
.btn-secondary-wide {
  flex: 1;
  padding: 12px 16px;
  font-size: 15px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  cursor: pointer;
}
.btn-secondary-wide:hover {
  background: #fafafa;
}
.btn-row {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}
.auth-footer-link {
  margin: 20px 0 0;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
}

/* ----- 收藏按钮 ----- */
.btn-fav-heart {
  background: rgba(61, 122, 110, 0.12);
  border: 1px solid rgba(61, 122, 110, 0.25);
  color: #2d5c52;
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 14px;
  cursor: pointer;
}
.btn-fav-heart:hover {
  background: rgba(61, 122, 110, 0.18);
}
.btn-fav-guest {
  background: rgba(110, 110, 115, 0.1);
  border-color: var(--border);
  color: var(--muted);
}

/* ----- 我的收藏 ----- */
.favorites-head {
  margin-bottom: 20px;
}
.favorites-title {
  margin: 0 0 8px;
  font-size: 1.5rem;
  font-weight: 600;
}
.favorites-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}
.empty-state {
  text-align: center;
  padding: 48px 16px;
  color: var(--muted);
}
.btn-link-pill {
  display: inline-block;
  margin-top: 16px;
  padding: 10px 20px;
  border-radius: 999px;
  background: rgba(61, 122, 110, 0.12);
  border: 1px solid rgba(61, 122, 110, 0.25);
}
.favorites-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.fav-preview {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
}
.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
  border-radius: 8px;
  margin-right: 8px;
}

/* ----- 弹窗 ----- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}
.modal-overlay.hidden {
  display: none;
}
.modal-card {
  background: var(--card);
  border-radius: 16px;
  padding: 24px;
  max-width: 360px;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}
.modal-title {
  margin: 0 0 10px;
  font-size: 1.15rem;
}
.modal-text {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}
.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.modal-btn-link {
  text-align: center;
  text-decoration: none;
  display: block;
  box-sizing: border-box;
}
.modal-link {
  text-align: center;
  display: block;
}

.segmented-wrap.hidden {
  display: none;
}