/* Learning page visual refinement — UI only. */
body.mathcourse-site .mc-learning-page .mathcourse-video{width:100%;height:100%;aspect-ratio:16/9}
body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder{width:100%;height:100%;min-height:260px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:32px 20px;box-sizing:border-box;background:radial-gradient(circle at 50% 42%,rgba(23,105,224,.12),transparent 34%),#071421;color:#fff}
body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder__icon{width:58px;height:58px;display:grid;place-items:center;margin-bottom:16px;border:1px solid rgba(255,255,255,.16);border-radius:17px;background:rgba(255,255,255,.06);color:#8fc2ff;box-shadow:0 12px 30px rgba(0,0,0,.18)}
body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder__icon svg{width:29px;height:29px}
body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder__title{font-size:16px;font-weight:850;line-height:1.5;letter-spacing:.01em;color:rgba(255,255,255,.96)}
body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder__text{margin-top:6px;max-width:320px;font-size:12px;line-height:1.7;color:rgba(255,255,255,.52)}
/* Lesson navigation: quiet, compact, and visually tied to the player. */
body.mathcourse-site .mc-learning-page .mc-lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 12px}
body.mathcourse-site .mc-learning-page .mc-lesson-nav a{position:relative;display:flex;align-items:center;gap:11px;min-height:62px;padding:11px 14px;box-sizing:border-box;border:1px solid var(--mc-line,#e5eaf0);border-radius:14px;background:#fff;color:var(--mc-navy,#0d2942);box-shadow:0 5px 20px rgba(13,41,66,.045);transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
body.mathcourse-site .mc-learning-page .mc-lesson-nav a:hover{transform:translateY(-1px);border-color:#d5e2ef;box-shadow:0 9px 24px rgba(13,41,66,.07)}
body.mathcourse-site .mc-learning-page .mc-lesson-nav a:focus-visible{outline:3px solid rgba(23,105,224,.2);outline-offset:2px}
body.mathcourse-site .mc-learning-page .mc-lesson-nav a:last-child{justify-content:flex-end;text-align:right}
body.mathcourse-site .mc-learning-page .mc-lesson-nav .mc-lesson-nav__arrow{width:30px;height:30px;flex:0 0 30px;display:grid;place-items:center;border-radius:9px;background:var(--mc-blue-soft,#edf5ff);color:var(--mc-blue,#1769e0);font-size:17px;font-weight:800}
body.mathcourse-site .mc-learning-page .mc-lesson-nav .mc-lesson-nav__label{display:block;margin-bottom:3px;color:#9aa6b5;font-size:10px;font-weight:750}
body.mathcourse-site .mc-learning-page .mc-lesson-nav .mc-lesson-nav__title{display:block;max-width:330px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#334155;font-size:12px;font-weight:700}
body.mathcourse-site .mc-learning-page .mc-lesson-nav a.is-disabled{opacity:.45;pointer-events:none;background:#f8fafc}
body.mathcourse-site .mc-learning-page .mc-complete-banner{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 0 14px;padding:12px 15px;border:1px solid #dcefe7;border-radius:12px;background:#f4fbf7;color:#187453;font-size:12px;font-weight:700}
body.mathcourse-site .mc-learning-page .mc-complete-banner a{color:#1769e0;font-weight:800}
@media(max-width:640px){body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder{min-height:200px;padding:24px 16px}body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder__icon{width:50px;height:50px;margin-bottom:13px;border-radius:15px}body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder__icon svg{width:25px;height:25px}body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder__title{font-size:15px}body.mathcourse-site .mc-learning-page .mathcourse-player-placeholder__text{font-size:11px;margin-top:5px}
body.mathcourse-site .mc-learning-page .mc-lesson-nav{gap:8px;margin-bottom:10px}
body.mathcourse-site .mc-learning-page .mc-lesson-nav a{min-height:56px;padding:9px 10px;border-radius:11px;gap:7px;box-shadow:0 3px 14px rgba(13,41,66,.04)}
body.mathcourse-site .mc-learning-page .mc-lesson-nav .mc-lesson-nav__arrow{width:27px;height:27px;flex-basis:27px;border-radius:8px;font-size:15px}
body.mathcourse-site .mc-learning-page .mc-lesson-nav .mc-lesson-nav__label{font-size:9px}.mc-learning-page .mc-lesson-nav .mc-lesson-nav__title{font-size:11px;max-width:120px}
body.mathcourse-site .mc-learning-page .mc-complete-banner{align-items:flex-start;flex-direction:column;gap:6px;margin-left:10px;margin-right:10px;padding:11px 12px}
}
@media(max-width:380px){body.mathcourse-site .mc-learning-page .mc-lesson-nav a{padding-left:8px;padding-right:8px}.mc-learning-page .mc-lesson-nav .mc-lesson-nav__title{max-width:95px}}