:root {
  --primary: #165DFF; --primary-2: #4080FF; --bg: #F5F7FA; --text: #1D2129;
  --muted: #86909C; --border: #E5E6EB; --red: #FF5630; --green: #36B37E; --yellow: #FFAB00;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }
a { color: inherit; text-decoration: none; }

/* 顶栏 */
.topbar { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.topbar-inner { max-width: 1100px; margin: 0 auto; padding: 0 20px; height: 60px; display: flex; align-items: center; gap: 16px; }
.logo { font-size: 18px; font-weight: 700; color: var(--primary); white-space: nowrap; }
.user-chip { margin-left: auto; display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 14px; }
.btn-ghost { border: 1px solid var(--border); background: #fff; color: var(--text); border-radius: 6px; padding: 5px 12px; font-size: 13px; cursor: pointer; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

/* 通用 */
.container { max-width: 1100px; margin: 0 auto; padding: 28px 20px 60px; }
.empty { color: var(--muted); text-align: center; padding: 48px 0; }

/* 登录页 */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #165DFF 0%, #4080FF 60%, #6554C0 100%); padding: 20px; }
.login-card { background: #fff; border-radius: 16px; padding: 40px 36px; width: min(400px, 100%); box-shadow: 0 16px 48px rgba(0, 0, 0, .18); }
.login-card h1 { font-size: 22px; margin-bottom: 6px; }
.login-card .sub { color: var(--muted); font-size: 14px; margin-bottom: 26px; line-height: 1.7; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field input { width: 100%; height: 44px; border: 1px solid var(--border); border-radius: 8px; padding: 0 12px; font-size: 15px; outline: none; }
.field input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(22, 93, 255, .12); }
.btn-primary { width: 100%; height: 44px; background: var(--primary); color: #fff; border: none; border-radius: 8px; font-size: 15px; cursor: pointer; }
.btn-primary:hover { background: var(--primary-2); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; }
.login-err { color: var(--red); font-size: 13px; margin-top: 10px; min-height: 18px; }
.login-tip { margin-top: 18px; font-size: 12px; color: var(--muted); text-align: center; }

/* 首页课程卡片 */
.courses { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.course-card { background: #fff; border-radius: 12px; padding: 24px; border: 1px solid var(--border); transition: .2s; display: block; }
.course-card:hover { box-shadow: 0 8px 24px rgba(22, 93, 255, .12); transform: translateY(-2px); border-color: var(--primary-2); }
.course-card h2 { font-size: 20px; margin-bottom: 14px; }
.course-stats { display: flex; gap: 16px; color: var(--muted); font-size: 14px; flex-wrap: wrap; }
.course-updated { font-size: 12px; color: var(--muted); margin-top: 14px; border-top: 1px dashed var(--border); padding-top: 12px; }

/* 课程页 */
.section { margin: 28px 0; }
.section-title { display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 600; margin-bottom: 14px; }
.section-count { color: var(--muted); font-size: 13px; font-weight: 400; }
.lesson-list { background: #fff; border-radius: 12px; border: 1px solid var(--border); overflow: hidden; }
.lesson-row { display: flex; align-items: center; gap: 14px; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.lesson-row:last-child { border-bottom: none; }
.lesson-row:hover { background: #F7F9FF; }
.lesson-badge { flex: none; min-width: 46px; text-align: center; background: #E8F0FF; color: var(--primary); font-size: 13px; font-weight: 600; border-radius: 6px; padding: 4px 8px; font-family: Consolas, monospace; }
.lesson-name { flex: 1; font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lesson-go { color: var(--muted); font-size: 13px; }
.anim-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 12px; }
.anim-chip { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 14px 10px; text-align: center; font-size: 14px; transition: .15s; display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.anim-chip:hover { border-color: var(--primary-2); color: var(--primary); box-shadow: 0 4px 14px rgba(22, 93, 255, .1); }
.doc-row { display: flex; align-items: center; gap: 12px; padding: 13px 18px; border-bottom: 1px solid var(--border); font-size: 14px; }
.doc-row:last-child { border-bottom: none; }
.doc-tag { flex: none; font-size: 11px; font-weight: 600; border-radius: 4px; padding: 2px 8px; background: #F2F3F5; color: var(--muted); }
.doc-row:hover { background: #F7F9FF; }

/* 待授权页 */
.waiting-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg); padding: 20px; }
.waiting-card { background: #fff; border-radius: 16px; padding: 44px 36px; width: min(440px, 100%); text-align: center; border: 1px solid var(--border); box-shadow: 0 8px 30px rgba(0, 0, 0, .06); }
.waiting-icon { font-size: 52px; margin-bottom: 16px; }
.waiting-card h1 { font-size: 20px; margin-bottom: 10px; }
.waiting-card p { color: var(--muted); font-size: 14px; line-height: 1.8; margin-bottom: 8px; }
.waiting-card .btns { display: flex; gap: 12px; margin-top: 24px; justify-content: center; }

/* 管理后台标签页 */
.admin-tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.admin-tab { padding: 8px 18px; border: 1px solid var(--border); background: #fff; border-radius: 8px; cursor: pointer; font-size: 14px; color: var(--muted); }
.admin-tab:hover { border-color: var(--primary); color: var(--primary); }
.admin-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 管理后台 */
.admin-login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: #1D2129; padding: 20px; }
.admin-login-card { background: #fff; border-radius: 16px; padding: 36px; width: min(380px, 100%); }
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 24px; }
.stat-card { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 16px; text-align: center; }
.stat-card .num { font-size: 26px; font-weight: 700; }
.stat-card .num.pending { color: var(--yellow); }
.stat-card .num.approved { color: var(--green); }
.stat-card .num.visits { color: var(--primary); }
.stat-card .label { font-size: 12px; color: var(--muted); margin-top: 4px; }
.panel { background: #fff; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin-bottom: 20px; }
.panel-title { padding: 14px 18px; font-size: 15px; font-weight: 600; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 18px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 500; font-size: 13px; background: #FAFBFC; }
tr:last-child td { border-bottom: none; }
td .mini-btn { border: 1px solid var(--border); background: #fff; border-radius: 5px; padding: 3px 10px; font-size: 12px; cursor: pointer; margin-right: 6px; }
td .mini-btn.ok { color: var(--green); border-color: var(--green); }
td .mini-btn.no { color: var(--red); border-color: var(--red); }
td .mini-btn:hover { opacity: .75; }
td.mono { font-family: Consolas, monospace; font-size: 13px; color: var(--muted); }
.badge { display: inline-block; font-size: 11px; font-weight: 600; border-radius: 4px; padding: 2px 8px; }
.badge.pending { background: #FFF6E5; color: #D48806; }
.badge.approved { background: #E8FFEA; color: #1B7F37; }

@media (max-width: 600px) {
  .courses { grid-template-columns: 1fr; }
  .anim-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-row { grid-template-columns: 1fr; }
}