/* ==========================================================================
   V课程 · 课程 / 游戏 / 资源 / 题库 样式
   ========================================================================== */

/* ---------- 课程归档 ---------- */
.course-toolbar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  background:#fff;border-radius:var(--theme-border-radius-l);padding:14px 18px;
  box-shadow:var(--shadow-card);margin-bottom:22px;
}
.course-toolbar__left,.course-toolbar__right{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.course-toolbar select{width:auto;min-width:120px;padding:8px 12px;font-size:13px}
.course-toolbar__count{font-size:13px;color:var(--vk-text-3)}
.course-toolbar__count b{color:var(--theme-color)}

.filters{background:#fff;border-radius:var(--theme-border-radius-l);box-shadow:var(--shadow-card);padding:6px 18px;margin-bottom:22px}
.filter-group{display:flex;align-items:flex-start;gap:14px;padding:12px 0;border-bottom:1px dashed var(--theme-line-color)}
.filter-group:last-child{border-bottom:0}
.filter-group__label{flex:0 0 72px;font-size:13px;color:var(--vk-text-3);padding-top:5px}
.filter-group__body{display:flex;gap:6px;flex-wrap:wrap;flex:1 1 auto}
.filter-chip{padding:4px 12px;border-radius:var(--radius-pill);font-size:13px;color:var(--vk-text-2);transition:all var(--transition)}
.filter-chip:hover{background:var(--vk-bg);color:var(--theme-color)}
.filter-chip.is-active{background:var(--theme-color);color:#fff}

.course-list-wrap .grid{margin-bottom:24px}

/* ---------- 课程详情 ---------- */
.course-hero{background:linear-gradient(135deg,#0f1b33,#1c2f52 60%,#123a5c);color:#fff;padding:38px 0;position:relative;overflow:hidden}
.course-hero::after{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:rgba(43,110,246,.22);filter:blur(90px);right:-120px;top:-160px}
.course-hero .container{position:relative;z-index:1}
.course-hero__grid{display:grid;grid-template-columns:1.5fr 1fr;gap:44px;align-items:center}
.course-hero__crumbs{font-size:13px;color:rgba(255,255,255,.6);margin-bottom:14px}
.course-hero__crumbs a{color:rgba(255,255,255,.7)}
.course-hero__crumbs a:hover{color:#fff}
.course-hero__tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.course-hero__tag{padding:3px 11px;border-radius:var(--radius-pill);background:rgba(255,255,255,.14);font-size:12px;color:#dbe7ff}
.course-hero__title{font-size:34px;line-height:1.3;margin:0 0 14px;color:#fff;letter-spacing:-.5px}
.course-hero__desc{font-size:15px;line-height:1.75;color:rgba(255,255,255,.72);margin:0 0 20px;max-width:620px}
.course-hero__meta{display:flex;gap:22px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.65)}
.course-hero__meta b{display:block;font-size:19px;color:#fff;font-weight:700;line-height:1.3}

.course-buy{
  background:#fff;border-radius:var(--theme-border-radius-xl);padding:24px;
  box-shadow:0 20px 48px rgba(0,0,0,.24);color:var(--vk-text);
}
.course-buy__cover{aspect-ratio:16/9;border-radius:var(--theme-border-radius-m);overflow:hidden;margin-bottom:18px;background:var(--vk-bg-soft)}
.course-buy__cover img{width:100%;height:100%;object-fit:cover}
.course-buy__price{display:flex;align-items:baseline;gap:8px;margin-bottom:6px}
.course-buy__price .now{font-size:32px;font-weight:800;color:var(--vk-orange);line-height:1.1}
.course-buy__price .free{font-size:26px;font-weight:800;color:var(--vk-green)}
.course-buy__price .unit{font-size:13px;color:var(--vk-text-3)}
.course-buy__points{font-size:13px;color:var(--vk-text-3);margin-bottom:16px}
.course-buy__actions{display:flex;flex-direction:column;gap:10px}
.course-buy__note{font-size:12px;color:var(--vk-text-3);text-align:center;margin-top:12px}
.course-buy__owned{
  display:flex;align-items:center;gap:8px;padding:10px 14px;border-radius:var(--theme-border-radius-m);
  background:rgba(7,193,96,.09);color:#067a3f;font-size:13px;font-weight:500;margin-bottom:14px;
}
.course-buy__progress{margin-bottom:14px}
.progress-bar{height:8px;border-radius:var(--radius-pill);background:var(--vk-bg-soft);overflow:hidden}
.progress-bar__fill{height:100%;border-radius:var(--radius-pill);background:linear-gradient(90deg,var(--theme-color),#6b9cff);transition:width .4s ease}
.progress-label{display:flex;justify-content:space-between;font-size:12px;color:var(--vk-text-3);margin-bottom:6px}

.course-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;padding:30px 0 44px;align-items:flex-start}
.course-main{min-width:0}
.course-side{position:sticky;top:calc(var(--header-height) + 16px);display:flex;flex-direction:column;gap:16px}

.course-panel{background:#fff;border-radius:var(--theme-border-radius-xl);box-shadow:var(--shadow-card);overflow:hidden;margin-bottom:20px}
.course-panel__head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 22px;border-bottom:1px solid var(--theme-line-color)}
.course-panel__title{font-size:17px;font-weight:600;margin:0;display:flex;align-items:center;gap:8px}
.course-panel__body{padding:22px}
.course-panel__body--flush{padding:0}

/* 目录（章节/课时） */
.lesson-list{list-style:none;margin:0;padding:0}
.lesson-chapter{border-bottom:1px solid var(--theme-line-color)}
.lesson-chapter:last-child{border-bottom:0}
.lesson-chapter__head{display:flex;align-items:center;gap:10px;padding:14px 22px;background:var(--vk-bg);font-size:14px;font-weight:600}
.lesson-chapter__no{width:22px;height:22px;border-radius:6px;background:var(--theme-color);color:#fff;font-size:12px;display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.lesson-chapter__count{margin-left:auto;font-size:12px;color:var(--vk-text-3);font-weight:400}
.lesson-items{list-style:none;margin:0;padding:0}
.lesson-item{display:flex;align-items:center;gap:12px;padding:13px 22px;border-top:1px dashed var(--theme-line-color);transition:background var(--transition);font-size:14px}
.lesson-item:hover{background:hsla(var(--theme-color-hsl),.04)}
.lesson-item__icon{flex:0 0 auto;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--vk-bg-soft);font-size:11px;color:var(--vk-text-3)}
.lesson-item.is-done .lesson-item__icon{background:var(--vk-green);color:#fff}
.lesson-item.is-active{background:hsla(var(--theme-color-hsl),.07)}
.lesson-item.is-active .lesson-item__title{color:var(--theme-color);font-weight:600}
.lesson-item__title{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--vk-text)}
a.lesson-item__title:hover{color:var(--theme-color)}
.lesson-item__meta{font-size:12px;color:var(--vk-text-3);white-space:nowrap}
.lesson-item__lock{color:var(--vk-text-3);font-size:13px}
.lesson-item.is-locked{color:var(--vk-text-3)}
.lesson-item.is-locked .lesson-item__title{color:var(--vk-text-3);cursor:not-allowed}
.lesson-item__free{font-size:11px;color:var(--vk-green);border:1px solid rgba(7,193,96,.4);border-radius:4px;padding:0 5px;line-height:1.6}

/* 学习页播放器 */
.lesson-player{background:#0b1424;border-radius:var(--theme-border-radius-xl);overflow:hidden;position:relative;min-height:320px;display:flex;flex-direction:column}
.lesson-player__frame{position:relative;flex:1 1 auto;min-height:420px;background:#0b1424}
.lesson-player__frame iframe,.lesson-player__frame video{position:absolute;inset:0;width:100%;height:100%;border:0}
.lesson-player__frame--ratio{position:relative;padding-bottom:56.25%;height:0;min-height:0;flex:0 0 auto}
.lesson-player__bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 18px;background:#101c31;color:#cfe0ff;flex-wrap:wrap}
.lesson-player__title{font-size:14px;font-weight:500;color:#fff}
.lesson-player__actions{display:flex;gap:8px;align-items:center}
.lesson-player__actions .btn{background:rgba(255,255,255,.1);color:#fff;border-color:rgba(255,255,255,.16)}
.lesson-player__actions .btn:hover{background:var(--theme-color);border-color:var(--theme-color)}
.lesson-player__timer{font-size:12px;color:rgba(255,255,255,.55);font-variant-numeric:tabular-nums}
.lesson-locked{
  position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  background:linear-gradient(160deg,rgba(11,20,36,.96),rgba(20,40,72,.96));color:#dbe7ff;text-align:center;padding:30px;z-index:3;
}
.lesson-locked__icon{font-size:40px}
.lesson-locked__title{font-size:20px;color:#fff;margin:0}
.lesson-locked__desc{font-size:14px;color:rgba(255,255,255,.65);max-width:420px;margin:0}
.lesson-locked__actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:6px}

.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:16px}
.lesson-nav .btn{background:#fff;border-color:var(--theme-line-color);color:var(--vk-text-2)}
.lesson-nav .btn:hover{border-color:var(--theme-color);color:var(--theme-color)}

/* 课程资料 */
.course-files{list-style:none;margin:0;padding:0}
.course-files li{display:flex;align-items:center;gap:10px;padding:11px 0;border-bottom:1px dashed var(--theme-line-color);font-size:14px}
.course-files li:last-child{border-bottom:0}
.course-files .file-icon{font-size:16px}
.course-files .file-link{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.course-files .file-size{font-size:12px;color:var(--vk-text-3)}

/* 侧栏信息卡 */
.side-card{background:#fff;border-radius:var(--theme-border-radius-l);box-shadow:var(--shadow-card);padding:20px}
.side-card__title{font-size:15px;font-weight:600;margin:0 0 14px}
.teacher-card{display:flex;align-items:center;gap:12px}
.teacher-card img{width:52px;height:52px;border-radius:50%;object-fit:cover}
.teacher-card strong{display:block;font-size:15px}
.teacher-card span{font-size:12px;color:var(--vk-text-3)}
.course-facts{list-style:none;margin:0;padding:0}
.course-facts li{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px dashed var(--theme-line-color);font-size:13px}
.course-facts li:last-child{border-bottom:0}
.course-facts span{color:var(--vk-text-3)}
.course-facts b{font-weight:600}

/* ---------- 课程 Tab ---------- */
.course-tabs{display:flex;gap:4px;border-bottom:1px solid var(--theme-line-color);padding:0 22px;background:#fff;border-radius:var(--theme-border-radius-xl) var(--theme-border-radius-xl) 0 0;overflow-x:auto}
.course-tab{padding:15px 16px;font-size:14px;font-weight:500;color:var(--vk-text-3);white-space:nowrap;border-bottom:2px solid transparent;transition:all var(--transition)}
.course-tab:hover{color:var(--theme-color)}
.course-tab.is-active{color:var(--theme-color);border-bottom-color:var(--theme-color);font-weight:600}
.course-tab-panel{padding:24px}
.course-tab-content{display:none}
.course-tab-content.is-active{display:block}

/* ---------- 解题 / 练习 ---------- */
.quiz-wrap{background:#fff;border-radius:var(--theme-border-radius-xl);box-shadow:var(--shadow-card);overflow:hidden}
.quiz-head{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px 22px;background:linear-gradient(120deg,#eef4ff,#f7fbff);border-bottom:1px solid var(--theme-line-color);flex-wrap:wrap}
.quiz-progress{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--vk-text-2)}
.quiz-progress .progress-bar{width:180px}
.quiz-score{font-size:13px;color:var(--vk-text-3)}
.quiz-score b{color:var(--vk-orange);font-size:16px}
.quiz-body{padding:26px 22px}
.quiz-question{font-size:19px;line-height:1.7;margin:0 0 20px;font-weight:500;color:var(--vk-text)}
.quiz-question .q-no{display:inline-block;min-width:26px;height:26px;line-height:26px;text-align:center;border-radius:8px;background:hsla(var(--theme-color-hsl),.1);color:var(--theme-color);font-size:13px;font-weight:700;margin-right:8px;vertical-align:1px}
.quiz-options{display:flex;flex-direction:column;gap:10px;margin-bottom:18px}
.quiz-option{
  display:flex;align-items:center;gap:12px;padding:14px 18px;
  border:1px solid var(--theme-border-color);border-radius:var(--theme-border-radius-m);
  background:#fff;font-size:15px;cursor:pointer;transition:all var(--transition);text-align:left;width:100%;
}
.quiz-option:hover{border-color:var(--theme-color);background:hsla(var(--theme-color-hsl),.03)}
.quiz-option.is-selected{border-color:var(--theme-color);background:hsla(var(--theme-color-hsl),.07)}
.quiz-option.is-correct{border-color:var(--vk-green);background:rgba(7,193,96,.08)}
.quiz-option.is-wrong{border-color:var(--vk-red);background:rgba(245,34,45,.06)}
.quiz-option__key{
  flex:0 0 auto;width:26px;height:26px;border-radius:50%;background:var(--vk-bg-soft);
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;color:var(--vk-text-2);
}
.quiz-option.is-selected .quiz-option__key{background:var(--theme-color);color:#fff}
.quiz-option.is-correct .quiz-option__key{background:var(--vk-green);color:#fff}
.quiz-option.is-wrong .quiz-option__key{background:var(--vk-red);color:#fff}
.quiz-option__text{flex:1 1 auto}

.quiz-input{max-width:320px;font-size:16px;padding:12px 16px}
.quiz-fill .quiz-input{margin-bottom:14px}

.quiz-feedback{display:none;padding:16px 18px;border-radius:var(--theme-border-radius-m);margin-bottom:18px;font-size:14px;line-height:1.7}
.quiz-feedback.is-show{display:block}
.quiz-feedback.is-correct{background:rgba(7,193,96,.08);border-left:4px solid var(--vk-green)}
.quiz-feedback.is-wrong{background:rgba(245,34,45,.06);border-left:4px solid var(--vk-red)}
.quiz-feedback__title{font-weight:600;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.quiz-feedback__analysis{color:var(--vk-text-2)}
.quiz-feedback__analysis b{color:var(--vk-text)}

.quiz-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 22px;border-top:1px solid var(--theme-line-color);flex-wrap:wrap}
.quiz-foot__left{font-size:12px;color:var(--vk-text-3)}
.quiz-result{text-align:center;padding:40px 24px}
.quiz-result__score{font-size:52px;font-weight:800;line-height:1;color:var(--theme-color)}
.quiz-result__label{font-size:14px;color:var(--vk-text-3);margin-top:8px}
.quiz-result__stats{display:flex;justify-content:center;gap:32px;margin:24px 0;flex-wrap:wrap}
.quiz-result__stat b{display:block;font-size:22px;font-weight:700}
.quiz-result__stat span{font-size:12px;color:var(--vk-text-3)}
.quiz-result__actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}

/* 错题本 */
.wrong-item{display:flex;align-items:flex-start;gap:14px;padding:16px 0;border-bottom:1px dashed var(--theme-line-color)}
.wrong-item:last-child{border-bottom:0}
.wrong-item__main{flex:1 1 auto;min-width:0}
.wrong-item__q{font-size:15px;font-weight:500;margin:0 0 8px}
.wrong-item__meta{font-size:12px;color:var(--vk-text-3);display:flex;gap:12px;flex-wrap:wrap}
.wrong-item__badge{font-size:11px;padding:1px 8px;border-radius:var(--radius-pill)}
.wrong-item__badge.is-new{background:rgba(245,34,45,.1);color:var(--vk-red)}
.wrong-item__badge.is-practicing{background:rgba(255,138,0,.12);color:var(--vk-orange)}
.wrong-item__badge.is-mastered{background:rgba(7,193,96,.12);color:var(--vk-green)}

/* ---------- 游戏详情 ---------- */
.game-play-wrap{background:#0b1424;min-height:calc(100vh - var(--header-height));display:flex;flex-direction:column}
.game-play-bar{display:flex;align-items:center;gap:14px;padding:10px 18px;background:#101c31;color:#fff;flex-wrap:wrap}
.game-play-bar__title{font-size:15px;font-weight:500;flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.game-play-bar__actions{display:flex;gap:8px}
.game-play-bar .btn{background:rgba(255,255,255,.1);color:#fff;border-color:rgba(255,255,255,.16);padding:6px 14px;font-size:13px}
.game-play-bar .btn:hover{background:var(--theme-color);border-color:var(--theme-color)}
.game-frame{flex:1 1 auto;position:relative;min-height:560px;background:#000}
.game-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0;display:block}
.game-frame__loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:rgba(255,255,255,.7);font-size:14px}
.game-frame__loading .spinner{width:34px;height:34px;border:3px solid rgba(255,255,255,.2);border-top-color:var(--theme-color);border-radius:50%;animation:vk-spin .8s linear infinite}

.game-detail{padding:28px 0 40px}
.game-detail__grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:flex-start}
.game-stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.game-stat{background:var(--vk-bg);border-radius:var(--theme-border-radius-m);padding:12px;text-align:center}
.game-stat b{display:block;font-size:19px;font-weight:700;color:var(--theme-color)}
.game-stat span{font-size:12px;color:var(--vk-text-3)}

.game-rank-list{list-style:none;margin:0;padding:0}
.game-rank-list li{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px dashed var(--theme-line-color);font-size:13px}
.game-rank-list li:last-child{border-bottom:0}
.game-rank-no{width:20px;height:20px;border-radius:50%;background:var(--vk-bg-soft);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:var(--vk-text-3)}
.game-rank-no.is-1{background:linear-gradient(135deg,#ffd666,#ffb400);color:#fff}
.game-rank-no.is-2{background:linear-gradient(135deg,#d6dbe6,#aab4c6);color:#fff}
.game-rank-no.is-3{background:linear-gradient(135deg,#ffc08a,#e8915a);color:#fff}
.game-rank-name{flex:1 1 auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.game-rank-score{font-weight:700;color:var(--vk-orange)}

/* ---------- 资源详情 ---------- */
.resource-detail{padding:28px 0 44px}
.resource-detail__grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:flex-start}
.resource-file{
  display:flex;align-items:center;gap:18px;padding:22px;
  background:linear-gradient(120deg,#eef4ff,#f7fbff);border-radius:var(--theme-border-radius-l);margin-bottom:20px;
}
.resource-file__icon{font-size:40px;line-height:1}
.resource-file__main{flex:1 1 auto;min-width:0}
.resource-file__name{font-size:16px;font-weight:600;word-break:break-all}
.resource-file__meta{font-size:13px;color:var(--vk-text-3);margin-top:4px}
.resource-file__actions{display:flex;gap:10px;flex-wrap:wrap}
.resource-meta-list{list-style:none;margin:0;padding:0}
.resource-meta-list li{display:flex;justify-content:space-between;gap:10px;padding:9px 0;border-bottom:1px dashed var(--theme-line-color);font-size:13px}
.resource-meta-list li:last-child{border-bottom:0}
.resource-meta-list span{color:var(--vk-text-3)}

.resource-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.resource-card{display:flex;flex-direction:column;gap:10px;padding:18px;background:#fff;border-radius:var(--theme-border-radius-l);box-shadow:var(--shadow-card);transition:transform var(--transition),box-shadow var(--transition)}
.resource-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.resource-card__head{display:flex;align-items:center;gap:10px}
.resource-card__icon{width:40px;height:40px;border-radius:10px;background:hsla(var(--theme-color-hsl),.09);display:flex;align-items:center;justify-content:center;font-size:19px;flex:0 0 auto}
.resource-card__title{font-size:15px;font-weight:600;line-height:1.5;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.resource-card__meta{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--vk-text-3);margin-top:auto}
.resource-search{background:#fff;border-radius:var(--theme-border-radius-l);padding:16px;box-shadow:var(--shadow-card);margin-bottom:22px}
.resource-search .search-form{box-shadow:none;border:1px solid var(--theme-border-color)}
.resource-filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.resource-filters select{width:auto;min-width:120px;font-size:13px;padding:8px 12px}

/* ---------- 题库练习入口 ---------- */
.practice-entry{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.practice-card{display:flex;flex-direction:column;gap:8px;padding:22px;background:#fff;border-radius:var(--theme-border-radius-l);box-shadow:var(--shadow-card);border:1px solid transparent;transition:all var(--transition)}
.practice-card:hover{border-color:hsla(var(--theme-color-hsl),.24);box-shadow:var(--shadow-hover);transform:translateY(-3px)}
.practice-card__icon{font-size:26px}
.practice-card__title{font-size:16px;font-weight:600;margin:0}
.practice-card__desc{font-size:13px;color:var(--vk-text-3);margin:0;line-height:1.6}
.practice-card__meta{font-size:12px;color:var(--theme-color);margin-top:auto}

/* ---------- 课程上传 ---------- */
.upload-panel{background:#fff;border-radius:var(--theme-border-radius-xl);box-shadow:var(--shadow-card);padding:28px}
.upload-drop{
  border:2px dashed var(--theme-border-color);border-radius:var(--theme-border-radius-l);
  padding:40px 20px;text-align:center;transition:all var(--transition);cursor:pointer;background:var(--vk-bg);
}
.upload-drop:hover,.upload-drop.is-drag{border-color:var(--theme-color);background:hsla(var(--theme-color-hsl),.05)}
.upload-drop__icon{font-size:36px;margin-bottom:10px}
.upload-drop__text{font-size:15px;font-weight:500;margin-bottom:4px}
.upload-drop__hint{font-size:12px;color:var(--vk-text-3)}
.upload-progress{display:none;margin-top:16px}
.upload-progress.is-show{display:block}
.upload-file{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--vk-bg);border-radius:var(--theme-border-radius-m);margin-top:12px}
.upload-file__name{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px}
.upload-file__size{font-size:12px;color:var(--vk-text-3)}

@media (max-width:1239px){
  .course-hero__grid{grid-template-columns:1.3fr 1fr;gap:28px}
  .course-layout{grid-template-columns:minmax(0,1fr) 290px}
  .resource-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:991px){
  .course-hero{padding:26px 0}
  .course-hero__grid{grid-template-columns:1fr;gap:22px}
  .course-hero__title{font-size:26px}
  .course-layout,.game-detail__grid,.resource-detail__grid{grid-template-columns:1fr}
  .course-side{position:static}
  .course-buy__cover{display:none}
  .lesson-player__frame{min-height:300px}
  .practice-entry{grid-template-columns:1fr}
  .quiz-body{padding:20px 16px}
  .quiz-question{font-size:17px}
  .quiz-head,.quiz-foot{padding:14px 16px}
  .game-frame{min-height:420px}
  .game-play-bar{padding:8px 12px}
}
@media (max-width:767px){
  .course-hero__title{font-size:22px}
  .course-hero__desc{font-size:14px}
  .course-hero__meta{gap:16px}
  .course-hero__meta b{font-size:16px}
  .resource-grid{grid-template-columns:1fr}
  .course-panel__head,.lesson-chapter__head,.lesson-item{padding-left:16px;padding-right:16px}
  .course-panel__body{padding:16px}
  .course-tabs{padding:0 12px}
  .course-tab{padding:13px 12px;font-size:13px}
  .quiz-option{padding:12px 14px;font-size:14px}
  .lesson-player__frame{min-height:220px}
  .lesson-player__bar{padding:10px 12px}
  .lesson-player__title{font-size:13px}
  .game-frame{min-height:320px}
  .upload-panel{padding:18px}
  .upload-drop{padding:28px 14px}
}