/* An inward-facing presentation screen with editorial course typography. */
#lesson-dialog{width:min(1400px,96vw);max-width:96vw;max-height:94dvh;padding:0;overflow:auto;border:1px solid #bda6e83b;border-radius:8px;color:#efedf4;background:#111116;box-shadow:0 40px 140px #000b;font-family:var(--font);-webkit-font-smoothing:antialiased}
#lesson-dialog::backdrop{background:#07080dd9;backdrop-filter:blur(20px)}
#lesson-dialog .dialog-shell{overflow:visible}
#lesson-dialog .dialog-header{position:sticky;top:0;z-index:8;min-height:65px;padding:15px 36px;border-bottom:1px solid #e0d4f417;background:#121217ed;backdrop-filter:blur(20px)}
#lesson-dialog .dialog-header>span{font-size:13px;letter-spacing:.07em;color:#c3becb}.dialog-heading-status{margin-left:auto;margin-right:24px;font-size:11px!important;letter-spacing:.2em!important;color:#89818f!important}
#lesson-dialog .dialog-close{display:grid;place-items:center;width:34px;height:34px;background:transparent;border:1px solid #dad0ea30;line-height:1;color:#ddd3ec;transition:background .2s}.dialog-close:hover{background:#b697e522!important}
.course-layout{display:grid;grid-template-columns:minmax(0,1.48fr) minmax(360px,1fr);align-items:stretch;background:radial-gradient(ellipse at 35% 39%,#3d2c581f,transparent 62%)}
.course-media-column{position:relative;min-width:0;padding:37px 32px 32px 38px;background:radial-gradient(ellipse at 65% 42%,#49365b2b,transparent 69%)}
.course-section-label{display:flex;justify-content:space-between;align-items:center;font-size:11px;letter-spacing:.18em;color:#9e90b4;padding:0 10px}.course-section-label span:last-child{font-variant-numeric:tabular-nums;color:#c8b6df;letter-spacing:.12em}
.video-stage{position:relative;perspective:1700px;padding:48px 7px 43px 5px;margin:9px -9px 0 -3px;isolation:isolate}
.video-stage:before{content:'';position:absolute;inset:1% -3% -9%;z-index:-1;pointer-events:none;background-image:radial-gradient(#ceb5f369 .7px,transparent 1px);background-size:17px 17px;mask-image:radial-gradient(ellipse at 54% 62%,#0007,transparent 67%)}
.video-stage:after{content:'';position:absolute;left:10%;right:4%;height:12%;bottom:2%;z-index:-1;pointer-events:none;background:radial-gradient(ellipse,#b996f04a,transparent 68%);filter:blur(20px);transform:rotate(-3deg)}
.screen-assembly{position:relative;transform-style:preserve-3d;transform:rotateY(15deg) rotateX(3deg) rotateZ(-1.3deg);transform-origin:50% 50%}
.screen-assembly:before,.screen-assembly:after{content:'';position:absolute;pointer-events:none;border-radius:7px}
.screen-assembly:before{inset:-10px 9px 8px -12px;border:1px solid #c9b0ef3d;background:linear-gradient(120deg,#c6b5ef0c,transparent 42%);transform:translateZ(-24px)}
.screen-assembly:after{inset:2px -3px -8px -5px;background:linear-gradient(115deg,#a99ab7 0,#302b3a 1.5%,#51455f 44%,#241e2e 97%,#b6a7ca);transform:translateZ(-8px);box-shadow:-17px 35px 52px #0008,2px 0 21px #c6b5ef19}
.course-screen{position:relative;width:100%;aspect-ratio:16/10;border:1px solid #ded3ef8a;border-radius:5px;overflow:hidden;background:#0b0c11;isolation:isolate;box-shadow:0 0 0 5px #282431,0 0 0 6px #a18aad40,0 1px 2px #fff6}
.course-screen video{display:block;width:100%;height:100%;object-fit:contain;background:#0b0c11}.course-screen video[hidden],.course-poster[hidden]{display:none}.course-screen video:fullscreen{border-radius:0;object-fit:contain;background:#08090c}
.course-poster{position:absolute;inset:0;background:radial-gradient(ellipse at 79% 51%,color-mix(in srgb,var(--book-accent,#c4a9fc) 18%,#161623),transparent 75%),linear-gradient(125deg,#14171e,#282137)}
.course-poster:after{content:'';position:absolute;inset:0;pointer-events:none;background-image:radial-gradient(#cfb5f545 .6px,transparent .9px);background-size:10px 10px;mask-image:linear-gradient(90deg,transparent,#000);opacity:.4}
.course-poster>svg{position:absolute;width:68%;height:80%;right:-7%;top:11%;opacity:.47;transform:rotate(-12deg);filter:drop-shadow(0 0 12px #c3a3ee33)}
.poster-identity{position:absolute;left:7%;top:11%;z-index:1}.poster-identity>span{font-size:11px;letter-spacing:.16em;color:#b6a6c8}.poster-identity h3{font-size:clamp(32px,3.7vw,53px);font-weight:300;letter-spacing:.08em;margin-top:17px;color:#f1eafd}.poster-identity p{font-size:14px;color:#ada5b9;margin-top:10px}
.video-empty-label{position:absolute;left:7%;bottom:16%;display:flex;gap:14px;align-items:center;z-index:2}.video-status-icon{height:40px;width:40px;display:grid;place-items:center;border:1px solid #c1a9dc4f;border-radius:50%;color:#b6a2ce}.video-status-icon svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.4}.video-empty-label strong{display:block;font-size:14px;font-weight:400;color:#d4c8e3}.video-empty-label small{display:block;font-size:12px;line-height:1.6;color:#958ba3;margin-top:5px}.video-id{position:absolute;left:7%;right:7%;bottom:5%;padding-top:10px;border-top:1px solid #af92cf30;display:flex;justify-content:space-between;font-size:9px;letter-spacing:.14em;color:#8d7da0;z-index:1}
.video-description{display:flex;justify-content:space-between;gap:20px;padding:5px 10px 0;font-size:14px;line-height:1.8;color:#c3bacf}.video-description span:last-child{font-size:12px;color:#82788f;white-space:nowrap}
.video-message{font-size:14px;color:#d3bedf;line-height:1.8;margin-top:15px;padding:12px 15px;border-left:1px solid #ac8acc;background:#b498cb0a}.video-message[hidden]{display:none}
.course-interactive{margin:33px 10px 0;padding-top:23px;border-top:1px solid #c4b6d722}.course-interactive>summary{display:flex;justify-content:space-between;align-items:center;gap:16px;list-style:none;cursor:pointer;color:#d4ccdF;font-size:15px}.course-interactive>summary::-webkit-details-marker{display:none}.course-interactive>summary small{display:block;font-size:12px;color:#8c809b;margin-top:7px}.course-interactive>summary:after{content:'＋';font-size:23px;font-weight:300;color:#c4b1df}.course-interactive[open]>summary:after{content:'−'}
.interactive-inner{margin-top:22px;padding:20px;background:#c6b5ef06;border-left:1px solid #bba1dc45}.interactive-inner .slide-visual{min-height:150px;border:0;background:none}.interactive-inner .slide-visual svg{height:174px;width:100%;max-width:320px}.interactive-caption{font-size:14px;line-height:1.8;color:#9d91ad;margin-top:13px}.course-points{padding-left:19px;margin:0;font-size:15px;line-height:1.9;color:#b4a8c1}.course-points li+li{margin-top:9px}
.course-detail-column{display:flex;flex-direction:column;gap:26px;min-width:0;padding:36px 40px 32px 30px;background:none}
.course-heading{border:0;padding:0}.course-subject-kicker{display:flex;justify-content:space-between;align-items:center;font-size:12px;line-height:1.5;letter-spacing:.11em;color:#a89abb}.course-subject-kicker span:last-child{font-size:11px;letter-spacing:.16em;color:#8a7d99}
.course-detail-title{display:flex;align-items:baseline;gap:21px;margin:18px 0 0;line-height:1.1;font-weight:300;letter-spacing:.035em;color:#f1edf8}.course-detail-title>span{font-size:58px;font-weight:300}.course-detail-title>small{font-size:17px;font-weight:400;letter-spacing:.09em;color:#c7bad9}.course-title-en{margin-top:12px;font-size:12px;font-weight:400;letter-spacing:.32em;color:#baa1dd}
.course-detail-topic{font-size:18px;line-height:1.55;font-weight:400;letter-spacing:.015em;margin-top:23px;color:#e2dbe9}.course-detail-desc{font-size:15px;line-height:1.85;font-weight:400;letter-spacing:.015em;margin-top:10px;color:#a59cac}
.analysis-heading{font-size:12px;font-weight:400;line-height:1.5;letter-spacing:.13em;color:#a398b2;margin:0}.analysis-tabs{display:flex;gap:24px;margin-top:5px;border-bottom:1px solid #d3c1ea25}.analysis-tabs button{position:relative;flex:0 0 auto;padding:13px 0 12px;background:none;color:#91879c;font-size:14px;line-height:1.4;font-weight:400;letter-spacing:.03em}.analysis-tabs button[aria-selected=true]{color:#dfccfa}.analysis-tabs button[aria-selected=true]:after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:1px;background:#ceb2f6;box-shadow:0 0 12px #c7adf26b}.analysis-tabs button:hover{color:#eee6fa}
.analysis-panel{min-height:123px;padding-top:19px}.analysis-panel h4{font-size:17px;font-weight:400;letter-spacing:.01em;line-height:1.6;color:#e2dbe9;margin:0}.analysis-panel>p{font-size:15px;font-weight:400;line-height:1.9;letter-spacing:.015em;color:#ada3b9;margin-top:8px}.analysis-panel .answer-text{font-size:14px;line-height:1.8;color:#c8bad9;margin-top:13px}.analysis-panel .answer-text[hidden]{display:none}.analysis-panel .answer-button{margin-top:12px;padding:7px 0;background:none;border-radius:0;border-bottom:1px solid #c6b5ef55;color:#cbb8e5;font-size:13px}
.purchase-card{margin-top:auto;padding:21px 0 0;border-top:1px solid #d3c1ea25;background:none}.purchase-top{display:flex;justify-content:space-between;align-items:center;gap:12px}.purchase-top h3{font-size:13px;font-weight:400;letter-spacing:.05em;color:#aea3ba}.purchase-top>span{font-size:10px;letter-spacing:.16em;color:#83748f}.purchase-offer{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-top:13px}.purchase-price{font-size:22px;font-weight:300;letter-spacing:.025em;color:#e5dced}.purchase-price small{font-size:16px;margin-right:4px}.purchase-type{font-size:12px;color:#8b7e99}.purchase-action{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;min-height:47px;padding:11px 20px;border:1px solid #d8c2f540;border-radius:40px;background:#c6b5ef;color:#201726;font-size:14px;letter-spacing:.06em;margin-top:16px;transition:background .2s}.purchase-action:hover{background:#dcc8fa}.purchase-action:disabled{opacity:1;background:linear-gradient(110deg,#c6b5ef14,#c6b5ef23);border-color:#cbb4e951;color:#c4b5d4;cursor:not-allowed}.purchase-action svg{width:13px;height:15px;fill:none;stroke:currentColor;stroke-width:1.3}.purchase-note{font-size:12px;line-height:1.75;margin-top:10px;color:#887b94}
.course-detail-footer{display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid #e0d4f417;padding:14px 36px;background:#101014}.course-detail-footer>p{font-size:10px;letter-spacing:.18em;color:#82758f}.course-switcher{display:flex;flex-wrap:wrap;gap:12px}.course-switcher button{padding:8px 16px;background:none;border:1px solid transparent;border-radius:30px;color:#9b8dac;font-size:13px}.course-switcher button[aria-pressed=true]{border-color:#b79ad44f;background:#c6b5ef09;color:#deccef}.course-switcher button:hover{color:#f0dfff}
.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.geography-art img{width:100%;height:100%;object-fit:cover;opacity:.82}.geography-art>span{z-index:1;background:#111b20d9;padding:5px 8px;border-radius:3px}
@media(max-width:1100px){.course-layout{grid-template-columns:minmax(0,1.22fr) minmax(330px,1fr)}.course-media-column{padding:30px 22px 25px}.course-detail-column{padding:30px 27px 28px 18px;gap:23px}.course-detail-title>span{font-size:51px}.course-detail-title{gap:15px}.course-detail-title>small{font-size:15px}.course-detail-topic{font-size:17px;margin-top:20px}.course-detail-desc,.analysis-panel>p{font-size:14px}.video-stage{padding-top:60px;padding-bottom:44px}.video-description{display:block}.video-description span:last-child{display:block;margin-top:4px}.analysis-tabs{gap:21px}.analysis-panel{min-height:134px}.course-detail-footer{padding:13px 27px}.course-detail-footer>p{font-size:9px}}
@media(max-width:760px){#lesson-dialog{width:96vw;max-height:94dvh}#lesson-dialog .dialog-header{padding:14px 20px;min-height:61px}#lesson-dialog .dialog-header>span{font-size:12px}.dialog-heading-status{display:none}.course-layout{grid-template-columns:1fr}.course-media-column{padding:25px 24px 24px}.course-section-label{font-size:10px;padding:0 1px}.video-stage{perspective:1100px;padding:30px 0 30px;margin:6px 0 0}.screen-assembly{transform:rotateY(9deg) rotateX(2deg) rotateZ(-1deg)}.screen-assembly:before{inset:-6px 4px 4px -6px}.course-screen{aspect-ratio:16/10;box-shadow:0 0 0 3px #282431,0 0 0 4px #a18aad40}.video-description{font-size:13px;padding:3px 0 0}.video-description span:last-child{font-size:11px}.course-interactive{margin:23px 0 0;padding-top:19px}.course-interactive>summary{font-size:14px}.course-interactive>summary small{font-size:11px}.course-detail-column{padding:27px 24px 29px;border-top:1px solid #d3c1ea1c;gap:25px}.course-subject-kicker{font-size:11px}.course-detail-title>span{font-size:52px}.course-detail-title>small{font-size:16px}.course-title-en{font-size:11px;letter-spacing:.28em}.course-detail-topic{font-size:18px;margin-top:21px}.course-detail-desc,.analysis-panel>p{font-size:15px}.analysis-panel{min-height:0}.analysis-tabs{gap:25px}.analysis-tabs button{font-size:14px}.purchase-card{padding-top:21px}.purchase-type{font-size:11px}.purchase-note{font-size:12px}.course-detail-footer{padding:13px 14px;justify-content:center}.course-detail-footer>p{display:none}.course-switcher{gap:4px}.course-switcher button{font-size:13px;padding:9px 13px}.poster-identity>span{font-size:9px}.poster-identity h3{font-size:32px;margin-top:11px}.poster-identity p{font-size:11px}.video-empty-label{gap:9px}.video-status-icon{width:29px;height:29px}.video-status-icon svg{width:14px;height:14px}.video-empty-label strong{font-size:12px}.video-empty-label small{font-size:10px}.video-id{font-size:7px;padding-top:6px}.lesson-grid{grid-template-columns:1fr}}

.subject-card:disabled{cursor:default}.subject-card:disabled .book-label>small{color:#c4b4d8;letter-spacing:.035em}.subject-card:disabled .card-open{font-size:28px;color:#9c8eae}.course-points{padding-left:0}

.course-preview-tabs{display:flex;flex-wrap:wrap;column-gap:22px;row-gap:8px;padding:0 10px;margin-top:22px}.course-preview-tabs button{position:relative;flex:0 0 auto;white-space:nowrap;background:none;padding:4px 0 10px;font-size:13px;color:#92849f;letter-spacing:.04em}.course-preview-tabs button[aria-selected=true]{color:#dcc6f7}.course-preview-tabs button[aria-selected=true]:after{content:'';position:absolute;bottom:0;left:0;width:25px;height:1px;background:#c6b5ef;box-shadow:0 0 10px #c6b5ef7a}.course-preview-tabs+.video-stage{margin-top:0;padding-top:30px}@media(max-width:760px){.course-preview-tabs{padding:0;gap:20px;margin-top:20px}.course-preview-tabs button{font-size:12px}.course-preview-tabs+.video-stage{padding-top:25px}}