/* 师资列表、教师风采展示页；沿用官网红白灰视觉。 */
.teacher-page {
  background: #f6f7f9;
  color: #41464d;
}
.teacher-page .wrap { max-width: 1200px; }
.list-breadcrumb {
  background: #fff;
  border-bottom: 1px solid #e9ecf0;
}
.list-breadcrumb .wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 58px;
  padding-top: 14px;
  padding-bottom: 14px;
  color: #78818e;
  font-size: 14px;
  line-height: 1.8;
  flex-wrap: wrap;
}
.list-breadcrumb a { color: inherit; }
.list-breadcrumb a:hover { color: #e60012; }
.teacher-main { padding-bottom: 64px; }
.teacher-subject-nav {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  border-bottom: 1px solid #e2e5e9;
  margin: 24px 0 32px;
  background: #fff;
  border-radius: 8px;
}
.teacher-subject-nav a {
  text-align: center;
  padding: 18px 8px;
  font-size: 18px;
  font-weight: 700;
  color: #454b53;
  border-bottom: 3px solid transparent;
}
.teacher-subject-nav a:hover,
.teacher-subject-nav a[aria-current="true"] { color: #e60012; border-color: #e60012; }
.teacher-subject-section { margin-bottom: 44px; scroll-margin-top: 100px; }
.teacher-group-heading { display: flex; align-items: baseline; gap: 14px; margin-bottom: 20px; }
.teacher-group-heading h2 { margin: 0; font-size: 26px; color: #41464d; }
.teacher-group-heading h2::before { content: ""; display: inline-block; width: 4px; height: 22px; margin-right: 12px; background: #e60012; vertical-align: -2px; }
.teacher-group-heading > span { font-size: 14px; color: #89919d; }
.teacher-directory-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.teacher-directory-card { display: block; min-width: 0; border-radius: 10px; background: #fff; overflow: hidden; border: 1px solid #e6e9ef; color: inherit; transition: border-color .2s, box-shadow .2s; }
.teacher-directory-card:hover,
.teacher-directory-card:focus-visible { border-color: #ed1021; box-shadow: 0 12px 28px #471c2310; }
.teacher-portrait { position: relative; aspect-ratio: 3 / 4; overflow: hidden; background: #e9ecf0; }
.teacher-portrait img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.teacher-portrait::after { content: ""; position: absolute; inset: 0; background: #0003; opacity: 0; transition: opacity .2s; }
.teacher-style-button { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); opacity: 0; z-index: 1; white-space: nowrap; background: #e60012; color: #fff; border-radius: 6px; padding: 12px 24px; font-size: 16px; font-weight: 700; transition: opacity .2s; }
.teacher-directory-card:hover .teacher-style-button,
.teacher-directory-card:focus-visible .teacher-style-button,
.teacher-directory-card:hover .teacher-portrait::after,
.teacher-directory-card:focus-visible .teacher-portrait::after { opacity: 1; }
.teacher-card-copy { padding: 20px; }
.teacher-card-copy h3 { margin: 0 0 5px; font-size: 22px; color: #41464d; }
.teacher-page .teacher-subject { color: #e60012; font-weight: 700; margin: 0 0 10px; line-height: 1.6; }
.teacher-short-intro { font-size: 14px; color: #7b8491; margin: 0; line-height: 1.85; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden; }
.teacher-empty { grid-column: 1 / -1; margin: 0; padding: 28px; background: #fff; border: 1px dashed #dfe3e9; border-radius: 8px; color: #808995; line-height: 1.8; }
.teacher-profile { display: grid; grid-template-columns: 280px minmax(0,1fr); gap: 46px; margin-top: 32px; padding: 36px; background: #fff; border: 1px solid #e6e9ef; border-radius: 12px; }
.teacher-profile-photo { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; object-position: top; border-radius: 8px; }
.teacher-profile-copy { position: relative; padding: 12px 0 18px; }
.teacher-eyebrow { font-size: 12px; letter-spacing: 1px; color: #e60012; font-weight: 700; margin: 0 0 14px; }
.teacher-profile h1 { font-size: 36px; line-height: 1.3; margin: 0 0 12px; }
.teacher-profile-intro { font-size: 17px; line-height: 1.9; max-width: 700px; margin: 20px 0 24px; }
.teacher-book { display: inline-flex; align-items: center; justify-content: center; background: #e60012; color: #fff !important; border: 0; border-radius: 6px; min-height: 48px; padding: 12px 30px; font-weight: 700; text-decoration: none; }
.teacher-back { position: absolute; top: 0; right: 0; display: inline-flex; align-items: center; min-height: 36px; padding: 0 14px; border: 1px solid #e60012; border-radius: 5px; color: #e60012; font-size: 13px; font-weight: 700; }
.teacher-back:hover { background: #e60012; color: #fff; }
.teacher-course-section { margin-top: 42px; }
.teacher-section-note { margin: -8px 0 24px; color: #808995; }
.teacher-course-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 24px; }
.teacher-course-card { min-width: 0; display: block; color: inherit; border: 1px solid #e6e9ef; border-radius: 10px; overflow: hidden; background: #fff; }
.teacher-course-card:hover { border-color: #e60012; }
.teacher-course-cover { position: relative; aspect-ratio: 16 / 9; background: #e9ecf0; }
.teacher-course-cover img { display: block; width: 100%; height: 100%; object-fit: cover; }
.teacher-play { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); border-radius: 50%; background: #0008; color: #fff; width: 48px; height: 48px; display: grid; place-items: center; }
.teacher-course-duration { position: absolute; right: 10px; bottom: 10px; font-size: 12px; color: #fff; border-radius: 4px; background: #0009; padding: 2px 7px; }
.teacher-course-copy { padding: 18px; }
.teacher-course-teacher { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.teacher-course-teacher img { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; object-position: top; background: #eef0f3; }
.teacher-course-teacher span { display: flex; align-items: baseline; gap: 8px; min-width: 0; }
.teacher-course-teacher strong { color: #41464d; font-size: 15px; }
.teacher-course-teacher em { color: #e60012; font-size: 13px; font-style: normal; }
.teacher-course-copy h3 { font-size: 18px; line-height: 1.6; margin: 0 0 8px; }
.teacher-course-copy p { color: #808995; font-size: 14px; line-height: 1.8; margin: 5px 0 0; }
.teacher-course-card--own .teacher-course-copy { min-height: 118px; }
.teacher-course-card--own .teacher-course-copy h3 { margin-top: 0; }
.teacher-course-link { display: inline-block; margin-top: 12px; color: #e60012; font-size: 14px; font-weight: 700; }
.teacher-player-section { margin-top: 30px; padding: 30px; border-radius: 12px; background: #fff; }
.teacher-player-top { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.teacher-player-label { color: #e60012; font-size: 13px; font-weight: 700; letter-spacing: .08em; }
.teacher-player-layout { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(280px, .75fr); gap: 28px; align-items: stretch; }
.teacher-player-media { min-width: 0; padding: 12px; border-radius: 10px; background: #15181c; }
.teacher-player-section h1 { color: #fff; font-size: 30px; line-height: 1.45; margin: 10px 0 12px; }
.teacher-course-player { width: 100%; aspect-ratio: 16 / 9; display: block; background: #090a0c; }
.teacher-player-copy { display: flex; flex-direction: column; justify-content: center; padding: 24px 10px 24px 0; }
.teacher-player-copy .teacher-eyebrow { margin-bottom: 4px; }
.teacher-player-meta { color: #aeb6c1; font-size: 14px; margin: 0 0 18px; }
.teacher-player-intro { color: #687381; font-size: 15px; line-height: 1.9; margin: 0 0 26px; }
.teacher-player-copy .teacher-book { align-self: flex-start; }
.teacher-player-media + .teacher-player-copy { background: #20252b; border-radius: 10px; padding: 28px; }
.teacher-player-status { color: #c40014; }
.teacher-recommend-section { margin-top: 44px; }
.teacher-recommend-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.teacher-recommend-card { display: flex; gap: 14px; min-width: 0; padding: 14px; border: 1px solid #e6e9ef; border-radius: 10px; background: #fff; color: inherit; }
.teacher-recommend-card:hover { border-color: #e60012; }
.teacher-recommend-card img { width: 68px; height: 88px; flex: 0 0 auto; object-fit: cover; object-position: top; border-radius: 6px; background: #eef0f3; }
.teacher-recommend-card span { display: flex; flex-direction: column; min-width: 0; }
.teacher-recommend-card strong { color: #41464d; font-size: 16px; }
.teacher-recommend-card em { color: #e60012; font-size: 13px; font-style: normal; margin-top: 3px; }
.teacher-recommend-card small { display: -webkit-box; margin-top: 5px; color: #808995; font-size: 12px; line-height: 1.6; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
.teacher-recommend-card b { margin-top: auto; padding-top: 8px; color: #e60012; font-size: 12px; }
.teacher-recommend-courses { margin-top: 48px; }
.teacher-subject-tabs { display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 0; margin: 24px 0 32px; border-bottom: 1px solid #e2e5e9; background: #fff; border-radius: 8px; overflow: hidden; }
.teacher-subject-tabs button { border: 0; border-bottom: 3px solid transparent; border-radius: 0; background: #fff; color: #454b53; padding: 18px 8px; font: inherit; font-size: 18px; font-weight: 700; cursor: pointer; }
.teacher-subject-tabs button:hover,
.teacher-subject-tabs button.is-active { border-color: #e60012; color: #e60012; }
.teacher-recommend-track-wrap { position: relative; display: flex; align-items: center; gap: 10px; }
.teacher-recommend-track-wrap[hidden] { display: none; }
.teacher-recommend-track { display: grid; grid-auto-flow: column; grid-auto-columns: calc((100% - 32px) / 3); gap: 16px; min-width: 0; flex: 1; scroll-snap-type: x mandatory; overflow-x: auto; overscroll-behavior-inline: contain; scroll-behavior: smooth; scrollbar-width: none; }
.teacher-recommend-track::-webkit-scrollbar { display: none; }
.teacher-recommend-empty { grid-column: 1 / -1; min-width: 0; margin: 0; padding: 24px; border: 1px dashed #dfe3e9; border-radius: 8px; background: #fff; color: #8b95a2; }
.teacher-carousel-arrow { flex: 0 0 36px; width: 36px; height: 36px; border: 1px solid #e60012; border-radius: 50%; background: #fff; color: #e60012; font-size: 26px; line-height: 1; cursor: pointer; }
.teacher-carousel-arrow:hover { background: #e60012; color: #fff; }
.teacher-recommend-course-card { scroll-snap-align: start; min-width: 0; overflow: hidden; border: 1px solid #e4e7ec; border-radius: 10px; background: #fff; color: inherit; box-shadow: 0 6px 18px #26384a0b; }
.teacher-recommend-course-card:hover { border-color: #e60012; box-shadow: 0 10px 24px #26384a18; }
.teacher-recommend-course-card .teacher-course-cover { aspect-ratio: 16 / 8.7; }
.teacher-recommend-course-copy { padding: 13px 15px 15px; }
.teacher-recommend-course-copy .teacher-course-teacher { margin-bottom: 9px; }
.teacher-recommend-course-copy .teacher-course-teacher img { width: 34px; height: 34px; max-width: 34px; flex: 0 0 34px; }
.teacher-recommend-course-copy .teacher-course-teacher strong { font-size: 14px; }
.teacher-recommend-course-copy .teacher-course-teacher em { font-size: 12px; }
.teacher-recommend-course-copy h3 { margin: 0 0 5px; font-size: 16px; line-height: 1.45; }
.teacher-recommend-course-copy p { display: -webkit-box; min-height: 2.9em; margin: 0; overflow: hidden; color: #7b8491; font-size: 13px; line-height: 1.45; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.teacher-recommend-course-copy .teacher-course-link { margin-top: 8px; font-size: 13px; }
.teacher-player-top .teacher-back { position: static; }
.teacher-home-style { display: inline-flex; color: #e60012; border: 1px solid #e60012; border-radius: 5px; padding: 7px 16px; margin: 10px 0 0; font-size: 14px; font-weight: 700; }
.teacher-home-style:hover { background: #e60012; color: #fff; }
@media (max-width: 1000px) {
  .teacher-directory-grid { gap: 16px; }
  .teacher-card-copy { padding: 14px; }
  .teacher-profile { grid-template-columns: 220px minmax(0,1fr); gap: 28px; padding: 24px; }
}
@media (max-width: 767px) {
  .list-breadcrumb .wrap { min-height: 48px; font-size: 12px; }
  .teacher-subject-nav { grid-template-columns: repeat(3, minmax(0,1fr)); margin: 18px 0 26px; }
  .teacher-subject-nav a { padding: 12px 8px; font-size: 16px; }
  .teacher-directory-grid { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
  .teacher-card-copy { padding: 12px; }
  .teacher-card-copy h3 { font-size: 18px; }
  .teacher-short-intro { font-size: 13px; }
  .teacher-style-button { opacity: 1; top: auto; bottom: 10px; transform: translateX(-50%); padding: 7px 13px; font-size: 13px; }
  .teacher-group-heading h2 { font-size: 22px; }
  .teacher-profile { grid-template-columns: 110px minmax(0,1fr); gap: 16px; padding: 18px; align-items: start; margin-top: 20px; }
  .teacher-profile-copy { padding: 0; }
  .teacher-profile h1 { font-size: 26px; }
  .teacher-eyebrow { font-size: 10px; margin-bottom: 8px; }
  .teacher-profile-intro { font-size: 14px; line-height: 1.8; margin: 12px 0 16px; }
  .teacher-book { padding: 10px 16px; font-size: 14px; min-height: 44px; }
  .teacher-course-grid { grid-template-columns: 1fr; gap: 18px; }
  .teacher-course-section { margin-top: 28px; }
  .teacher-player-section { padding: 16px; }
  .teacher-player-top { align-items: flex-start; }
  .teacher-player-layout { grid-template-columns: 1fr; gap: 0; }
  .teacher-player-media { border-radius: 10px 10px 0 0; }
  .teacher-player-media + .teacher-player-copy { border-radius: 0 0 10px 10px; padding: 20px; }
  .teacher-player-section h1 { font-size: 24px; }
  .teacher-recommend-grid { grid-template-columns: 1fr; }
  .teacher-recommend-courses { margin-top: 32px; }
  .teacher-recommend-track { grid-auto-columns: 100%; gap: 12px; }
  .teacher-carousel-arrow { flex-basis: 32px; width: 32px; height: 32px; font-size: 22px; }
  .teacher-recommend-track-wrap { gap: 6px; }
  .teacher-recommend-track-wrap .teacher-recommend-track { flex: 1 1 auto; }
  .teacher-course-card--own .teacher-course-copy { min-height: 0; padding: 16px; }
  .teacher-course-card--own .teacher-course-teacher { display: none; }
  .teacher-course-card--own .teacher-course-cover { aspect-ratio: 16 / 9; }
}
@media (hover: none) { .teacher-style-button { opacity: 1; } }
/* 手机端长简介横向展开，避免挤在照片右侧。 */
@media (max-width: 767px) {
  .teacher-profile { display: flow-root; }
  .teacher-profile-photo { float: left; width: 96px; height: 128px; margin: 0 16px 16px 0; }
  .teacher-profile-copy { display: block; }
  .teacher-profile-intro { clear: both; padding-top: 8px; }
  .teacher-profile-copy .teacher-back { display: none; }
  .teacher-subject-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; margin: 18px 0 26px; }
  .teacher-subject-tabs button { padding: 12px 8px; font-size: 16px; }
  .teacher-group-heading { flex-wrap: wrap; gap: 8px; }
  .teacher-recommend-empty { padding: 18px; line-height: 1.8; }
}

/* 课程弹窗与走进新学共用播放器，框架隔离全局深色样式。 */
.teacher-video-modal[hidden] {
  display: none;
}
.teacher-video-modal {
  position: fixed;
  inset: 0;
  z-index: 1200;
  background: #131418;
}
.teacher-player-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}
.teacher-video-modal-open {
  overflow: hidden;
}