/* ===================================================================
 * admin.css — 后台样式
 * 两栏布局，左侧课程列表，右侧表单编辑器。移动端堆叠为单列。
 * =================================================================== */

:root {
  --bg: #f1f4f9;
  --panel: #ffffff;
  --ink: #1f2329;
  --ink-soft: #5b6470;
  --ink-faint: #8a94a3;
  --brand: #1e6cff;
  --brand-soft: #e8f0ff;
  --danger: #e54848;
  --danger-soft: #fef0f0;
  --warn: #ff8a00;
  --border: #e5e9f0;
  --radius: 10px;
  --shadow: 0 4px 18px rgba(20, 30, 50, 0.06);
}

* { box-sizing: border-box; }
/* 确保 hidden 属性生效，防止 display:flex/grid 等覆盖 */
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
button { font-family: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }

/* ----------------------- 顶栏 ----------------------- */
.admin-topbar { position: sticky; top: 0; z-index: 30; background: var(--panel); border-bottom: 1px solid var(--border); }
.admin-topbar__inner { max-width: 1280px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: 56px; padding: 0 20px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 16px; }
.brand__logo { width: 32px; height: 32px; border-radius: 50%; object-fit: contain; display: inline-block; vertical-align: middle; }
.back-link { font-size: 14px; color: var(--ink-soft); }
.back-link:hover { color: var(--brand); }

/* ----------------------- 布局 ----------------------- */
.admin-layout { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 16px; max-width: 1280px; margin: 16px auto; padding: 0 20px; }
@media (max-width: 900px) { .admin-layout { grid-template-columns: 1fr; } }

.admin-side { background: var(--panel); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; height: calc(100vh - 90px); overflow-y: auto; position: sticky; top: 72px; }
@media (max-width: 900px) { .admin-side { height: auto; position: static; } }
.admin-side__head { display: flex; flex-direction: column; gap: 10px; margin-bottom: 12px; }

/* ----------------------- 按钮 ----------------------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 8px 16px; border-radius: 8px; font-size: 14px; font-weight: 500; border: 1px solid transparent; transition: all .15s; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn--primary { background: var(--brand); color: #fff; border-color: var(--brand); }
.btn--primary:hover:not(:disabled) { background: #1859d6; border-color: #1859d6; }
.btn--ghost { background: transparent; color: var(--ink-soft); border-color: var(--border); }
.btn--ghost:hover:not(:disabled) { color: var(--brand); border-color: var(--brand); }
.btn--danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn--danger:hover:not(:disabled) { background: #c63838; border-color: #c63838; }
.btn--sm { padding: 5px 10px; font-size: 12px; }
.btn--lg { padding: 12px 24px; font-size: 15px; }

/* ----------------------- 搜索框 ----------------------- */
.search-input input { width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; outline: none; transition: border-color .15s; }
.search-input input:focus { border-color: var(--brand); }

/* ----------------------- 课程列表 ----------------------- */
.course-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.course-item { display: flex; gap: 10px; padding: 10px; border-radius: 8px; cursor: pointer; border: 1px solid transparent; transition: all .15s; }
.course-item:hover { background: var(--brand-soft); }
.course-item.is-active { background: var(--brand-soft); border-color: rgba(30,108,255,.25); }
.course-item__cover { width: 56px; height: 36px; border-radius: 6px; background: linear-gradient(135deg, #1e6cff, #74a8ff); flex-shrink: 0; display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.85); font-size: 10px; font-weight: 700; text-align: center; padding: 4px; overflow: hidden; }
.course-item__cover img { width: 100%; height: 100%; object-fit: cover; }
.course-item__body { min-width: 0; flex: 1; }
.course-item__title { font-size: 13px; font-weight: 600; line-height: 1.35; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.course-item__meta { font-size: 11px; color: var(--ink-faint); margin-top: 4px; display: flex; gap: 8px; }
.course-list__empty { padding: 18px; text-align: center; color: var(--ink-faint); font-size: 13px; }

/* ----------------------- 主区 ----------------------- */
.admin-main { min-width: 0; }

.empty-editor { background: var(--panel); border-radius: var(--radius); box-shadow: var(--shadow); padding: 80px 24px; text-align: center; color: var(--ink-soft); }
.empty-editor__icon { font-size: 48px; margin-bottom: 12px; }
.empty-editor__title { font-size: 16px; color: var(--ink); margin-bottom: 6px; }
.empty-editor__hint { font-size: 13px; color: var(--ink-faint); }

/* ----------------------- 编辑器 ----------------------- */
.editor { display: flex; flex-direction: column; gap: 16px; }
.editor__head { background: var(--panel); border-radius: var(--radius); padding: 18px 22px; box-shadow: var(--shadow); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.editor__title { font-size: 18px; font-weight: 700; margin: 0; }
.editor__sub { font-size: 13px; color: var(--ink-faint); margin-top: 4px; }
.editor__actions { display: flex; gap: 8px; flex-wrap: wrap; }

.editor__foot { background: var(--panel); border-radius: var(--radius); padding: 16px 22px; box-shadow: var(--shadow); display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.editor__saved { font-size: 13px; color: var(--ink-faint); }
.editor__saved.is-success { color: #16a34a; }
.editor__saved.is-error { color: var(--danger); }

/* ----------------------- 卡片 ----------------------- */
.card { background: var(--panel); border-radius: var(--radius); padding: 18px 22px; box-shadow: var(--shadow); }
.card__title { display: flex; justify-content: space-between; align-items: center; font-size: 15px; font-weight: 700; margin-bottom: 14px; }

/* ----------------------- 表单 ----------------------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 700px) { .grid-2 { grid-template-columns: 1fr; } }

.grid-cover { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
@media (max-width: 900px) { .grid-cover { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 6px; }
.field--inline { margin-top: 10px; }
.field__label { font-size: 13px; color: var(--ink-soft); display: flex; gap: 4px; }
.field__label em { color: var(--danger); font-style: normal; }
.field input[type="text"], .field input[type="number"], .field input[type="url"], .field textarea, .field select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; outline: none;
  background: #fafbfd; transition: border-color .15s, background .15s; resize: vertical;
}
.field select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding-right: 34px;
  background-color: #fafbfd;
  background-image: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiIgdmlld0JveD0iMCAwIDI0IDI0IiBmaWxsPSJub25lIiBzdHJva2U9IiM1YjY0NzAiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIj48cGF0aCBkPSJNNiA5bDYgNiA2LTYiLz48L3N2Zz4=");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 16px 16px;
  cursor: pointer;
}
.field select:hover { border-color: #c5ccd8; }
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--brand); background-color: #fff; }
.field select:focus { background-image: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiIgdmlld0JveD0iMCAwIDI0IDI0IiBmaWxsPSJub25lIiBzdHJva2U9IiMxZTZjZmYiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIj48cGF0aCBkPSJNNiA5bDYgNiA2LTYiLz48L3N2Zz4="); }
.field select option { background: #fff; color: var(--ink); font-size: 14px; padding: 8px 10px; }
.field__hint { font-size: 12px; color: var(--ink-faint); margin-top: 4px; }

/* ----------------------- 上传器 ----------------------- */
.uploader { position: relative; }
.uploader input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; z-index: 1; }
.uploader__preview {
  height: 160px; border: 2px dashed var(--border); border-radius: var(--radius); background: #fafbfd;
  display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.uploader__preview img, .uploader__preview video { width: 100%; height: 100%; object-fit: cover; }
.uploader__preview--video { height: 180px; background: #e3f4ff; }
.uploader__preview--video video { background: #000; }
.uploader__placeholder { color: var(--ink-faint); font-size: 13px; pointer-events: none; }
.uploader__clear { margin-top: 8px; font-size: 12px; color: var(--danger); background: var(--danger-soft); padding: 4px 10px; border-radius: 6px; position: relative; z-index: 2; }
.uploader__clear:hover { background: #fcd9d9; }

/* ----------------------- 上传进度条 ----------------------- */
.upload-progress { display: flex; flex-direction: column; gap: 6px; min-width: 220px; max-width: 420px; }
.upload-progress__track { height: 8px; border-radius: 4px; background: rgba(255,255,255,0.65); box-shadow: inset 0 1px 2px rgba(0,0,0,0.12); overflow: hidden; }
.upload-progress__bar { height: 100%; width: 0%; border-radius: 4px; background: linear-gradient(90deg, #38bdf8, #0284c7); transition: width .2s ease; }
.upload-progress--done .upload-progress__bar { background: linear-gradient(90deg, #4ade80, #16a34a); }
.upload-progress--error .upload-progress__bar { background: linear-gradient(90deg, #f87171, #dc2626); }
.upload-progress__text { font-size: 12px; color: var(--ink-soft); display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.upload-progress__status { font-weight: 600; white-space: nowrap; }
.upload-progress__file { color: var(--ink-faint); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.upload-progress--done .upload-progress__status { color: #16a34a; }
.upload-progress--error .upload-progress__status { color: #dc2626; }
.chapter-row__progress .upload-progress__text { font-size: 12px; }
.chapter-row__progress .upload-progress__track { height: 6px; }

/* ----------------------- 章节编辑器 ----------------------- */
.chapter-editor { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; counter-reset: ch; }
.chapter-row { display: grid; grid-template-columns: 32px 1fr 120px auto; gap: 10px; align-items: start; padding: 14px; border: 1px solid var(--border); border-radius: 10px; background: #fafbfd; }
.chapter-row__num { display: flex; align-items: center; justify-content: center; height: 40px; font-weight: 700; font-size: 14px; color: var(--ink-soft); }
.chapter-row__body { display: flex; flex-direction: column; gap: 10px; }
.chapter-row__title,
.chapter-row__video input[type="url"] {
  font-size: 13px;
  line-height: 1.4;
  padding: 9px 12px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  box-sizing: border-box;
  font-family: inherit;
}
.chapter-row__title::placeholder,
.chapter-row__video input[type="url"]::placeholder { color: var(--ink-faint); }
.chapter-row__title { width: 100%; }
/* 时长改为只读文本展示（非输入框） */
.chapter-row__duration { width: 120px; text-align: center; color: var(--ink-soft); font-size: 13px; display: flex; align-items: center; justify-content: center; height: 40px; font-variant-numeric: tabular-nums; }
.chapter-row__video { display: flex; gap: 10px; align-items: center; }
.chapter-row__video input[type="url"] { flex: 1; min-width: 160px; }
.chapter-row__upload {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 16px;
  font-size: 13px;
  font-weight: 500;
  background: var(--brand-soft);
  color: var(--brand);
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s, transform .05s;
}
.chapter-row__upload:hover { background: #d6e6ff; }
.chapter-row__upload:active { transform: translateY(1px); }
.chapter-row__upload input { display: none; }
.chapter-row__remove {
  height: 40px;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--danger);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
}
.chapter-row__remove:hover { background: var(--danger-soft); }
.chapter-row__file { font-size: 12px; color: var(--ink-faint); }
.chapter-row__hint { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: var(--ink-faint); }
@media (max-width: 640px) {
  .chapter-row { grid-template-columns: 32px 1fr; }
  .chapter-row__video { flex-wrap: wrap; }
  .chapter-row__duration { width: 100%; }
}

.chapter-editor__empty { padding: 16px; text-align: center; color: var(--ink-faint); font-size: 13px; border: 1px dashed var(--border); border-radius: 8px; }

/* ----------------------- 图片海报上传器 ----------------------- */
.gallery-uploader { display: flex; flex-wrap: wrap; gap: 12px; }
.gallery-add {
  width: 120px; height: 96px; border: 2px dashed var(--border); border-radius: var(--radius);
  background: #fafbfd; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; cursor: pointer; color: var(--ink-soft); transition: border-color .15s, color .15s;
}
.gallery-add:hover { border-color: var(--brand); color: var(--brand); }
.gallery-add__plus { font-size: 26px; line-height: 1; font-weight: 300; }
.gallery-add__text { font-size: 12px; }
.gallery-grid { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 12px; }
.gallery-item { position: relative; width: 120px; height: 96px; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); background: #f3f5f8; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; display: block; }
.gallery-item__remove {
  position: absolute; top: 4px; right: 4px; width: 22px; height: 22px; border-radius: 50%;
  background: rgba(20,30,50,.65); color: #fff; font-size: 13px; line-height: 22px; text-align: center;
  display: flex; align-items: center; justify-content: center; transition: background .15s;
}
.gallery-item__remove:hover { background: var(--danger); }


/* ----------------------- 弹窗 ----------------------- */
.modal { position: fixed; inset: 0; background: rgba(20, 30, 50, .55); z-index: 50; display: flex; align-items: center; justify-content: center; }
/* 修复 hidden 属性被 display:flex 覆盖导致弹窗无法关闭 */
.modal[hidden] { display: none; }
.modal__panel { background: var(--panel); border-radius: var(--radius); padding: 22px; width: min(420px, 92vw); box-shadow: 0 24px 48px rgba(0,0,0,.18); }
.modal__panel h3 { margin: 0 0 10px; font-size: 16px; }
.modal__panel p { margin: 0 0 18px; color: var(--ink-soft); font-size: 14px; line-height: 1.6; white-space: pre-line; }
.modal__actions { display: flex; justify-content: flex-end; gap: 10px; }

/* ----------------------- 移动端微调 ----------------------- */
@media (max-width: 900px) {
  .admin-layout { padding: 0 12px; margin: 10px auto; }
  .card, .editor__head, .editor__foot { padding: 14px 16px; }
  .editor__head { flex-direction: column; align-items: stretch; }
  .editor__actions { justify-content: flex-end; }
  .admin-tabs { padding: 0 12px; }
  .review-panel { padding: 12px; }
  .review-filter { flex-wrap: wrap; gap: 6px; }
}

/* ----------------------- Tab 栏 ----------------------- */
.admin-tabs {
  display: flex; align-items: center; gap: 4px;
  max-width: 1200px; margin: 0 auto;
  padding: 0 20px;
  border-bottom: 2px solid var(--border);
  background: var(--bg);
}
.admin-tab {
  padding: 10px 18px; border: none; background: none;
  font-size: 14px; font-weight: 600; color: var(--ink-soft);
  cursor: pointer; border-bottom: 2px solid transparent;
  margin-bottom: -2px; transition: all .15s;
  display: inline-flex; align-items: center; gap: 6px;
}
.admin-tab:hover { color: var(--ink); }
.admin-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.admin-tab__badge {
  font-size: 11px; background: #ef4444; color: #fff;
  padding: 1px 7px; border-radius: 10px; font-weight: 700; min-width: 18px; text-align: center;
}
.admin-tab__admin-mode {
  margin-left: auto; font-size: 12px; color: #fff;
  background: #8b5cf6; padding: 3px 10px; border-radius: 4px; font-weight: 600;
}

/* ----------------------- 讲师审核面板 ----------------------- */
.review-panel { max-width: 1200px; margin: 0 auto; padding: 20px; }
.review-panel__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.review-panel__head h2 { font-size: 18px; font-weight: 700; color: var(--ink); margin: 0; }
.review-filter { display: flex; gap: 8px; }
.review-filter__btn {
  padding: 6px 14px; border: 1px solid var(--border); background: #fff;
  border-radius: 6px; font-size: 13px; color: var(--ink-soft); cursor: pointer; transition: all .15s;
}
.review-filter__btn span { font-weight: 700; margin-left: 4px; }
.review-filter__btn:hover { border-color: var(--primary); color: var(--primary); }
.review-filter__btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.review-filter__btn.active span { color: #fff; }

.review-list { display: flex; flex-direction: column; gap: 12px; }
.review-empty { text-align: center; padding: 48px 20px; color: var(--ink-soft); font-size: 14px; }

.review-card {
  background: #fff; border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 20px; display: flex; align-items: flex-start; gap: 16px;
}
.review-card__avatar {
  width: 44px; height: 44px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px; font-weight: 700;
}
.review-card__body { flex: 1; min-width: 0; }
.review-card__row { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; flex-wrap: wrap; }
.review-card__name { font-size: 15px; font-weight: 700; color: var(--ink); }
.review-card__phone { font-size: 13px; color: var(--ink-soft); }
.review-card__status {
  font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 4px;
}
.review-card__status--pending { background: #fef3c7; color: #92400e; }
.review-card__status--approved { background: #d1fae5; color: #065f46; }
.review-card__status--rejected { background: #fee2e2; color: #991b1b; }
.review-card__field { font-size: 13px; color: var(--ink-soft); margin-bottom: 4px; }
.review-card__field b { color: var(--ink); font-weight: 600; }
.review-card__time { font-size: 12px; color: var(--ink-faint); }
.review-card__note { font-size: 12px; color: #991b1b; margin-top: 6px; background: #fef2f2; padding: 6px 10px; border-radius: 4px; }
.review-card__actions { display: flex; flex-direction: column; gap: 8px; flex-shrink: 0; }