.xyj-lesson { height: 100%; overflow-y: auto; padding: 4px 4px 72px; color: #223033; font-family: 'Noto Sans SC', 'Microsoft YaHei UI', sans-serif; }
.xyj-lesson > * { width: min(1180px, 100%); margin-right: auto; margin-left: auto; }
.xyj-lesson-hero { position: relative; min-height: 318px; overflow: hidden; border: 1px solid rgba(231, 191, 106, .27); border-radius: 8px; background: #0c1f24; box-shadow: 0 20px 44px rgba(0, 0, 0, .24); }
.xyj-lesson-hero-art { position: absolute; inset: 0; background-position: center; background-size: cover; }
.xyj-lesson-hero-content { position: relative; display: flex; min-height: 318px; max-width: 660px; flex-direction: column; justify-content: center; padding: 42px clamp(26px, 5vw, 68px); color: #f9f6e9; }
.xyj-lesson-kicker { margin: 0; color: #e8be66; font-size: 12px; font-weight: 800; letter-spacing: .2em; }
.xyj-lesson-chapter { margin: 16px 0 0; color: rgba(249, 246, 233, .7); font-size: 13px; font-weight: 700; }
.xyj-lesson-hero h1 { margin: 8px 0 0; font-family: 'Kaiti', 'STKaiti', serif; font-size: clamp(34px, 5vw, 54px); font-weight: 700; line-height: 1.08; }
.xyj-lesson-question { max-width: 480px; margin: 16px 0 0; color: rgba(249, 246, 233, .86); font-size: 16px; font-weight: 600; line-height: 1.75; }
.xyj-lesson-hero-meta { display: flex; margin-top: 25px; flex-wrap: wrap; gap: 9px; }
.xyj-lesson-hero-meta span { border: 1px solid rgba(232, 190, 102, .45); padding: 5px 9px; color: #f2d58d; font-size: 11px; font-weight: 700; }
.xyj-lesson-intro { display: flex; padding: 46px 16px 24px; align-items: end; justify-content: space-between; gap: 28px; }
.xyj-lesson-section-kicker { margin: 0; color: #a33c30; font-size: 11px; font-weight: 900; letter-spacing: .14em; }
.xyj-lesson h2 { margin: 9px 0 0; color: #17343a; font-family: 'Kaiti', 'STKaiti', serif; font-size: clamp(25px, 3vw, 34px); line-height: 1.18; }
.xyj-lesson-intro > p { max-width: 430px; margin: 0; color: #617174; font-size: 14px; font-weight: 600; line-height: 1.8; }
.xyj-storyboard-overview { overflow: hidden; border: 1px solid rgba(40, 71, 73, .18); border-radius: 7px; background: #10252a; }
.xyj-storyboard-overview img { display: block; width: 100%; height: auto; }
.xyj-scene-nav { display: grid; margin-top: 18px; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid rgba(40, 71, 73, .16); border-bottom: 1px solid rgba(40, 71, 73, .16); }
.xyj-scene-nav button { display: flex; min-height: 66px; flex-direction: column; justify-content: center; border: 0; border-right: 1px solid rgba(40, 71, 73, .16); color: #6d7c7f; background: rgba(255, 255, 255, .48); cursor: pointer; text-align: left; transition: background .18s ease, color .18s ease; }
.xyj-scene-nav button:last-child { border-right: 0; }
.xyj-scene-nav button:hover, .xyj-scene-nav button.is-active { color: #fff8e4; background: #173f42; }
.xyj-scene-nav span { padding: 0 13px; color: #b99147; font-size: 10px; font-weight: 900; }
.xyj-scene-nav b { padding: 5px 13px 0; font-size: 13px; font-weight: 800; }
.xyj-scene-stage { display: grid; margin-top: 26px; grid-template-columns: minmax(0, 1.05fr) minmax(310px, .95fr); border: 1px solid rgba(40, 71, 73, .18); background: #f7f8f5; }
.xyj-scene-art { position: relative; min-height: 486px; background-color: #0d262a; background-repeat: no-repeat; background-size: 500% 100%; }
.xyj-scene-count { position: absolute; top: 16px; left: 16px; border: 1px solid rgba(232, 190, 102, .65); padding: 5px 8px; color: #f7d486; background: rgba(9, 24, 28, .8); font-size: 11px; font-weight: 900; letter-spacing: .12em; }
.xyj-scene-copy { display: flex; padding: clamp(26px, 4vw, 46px); flex-direction: column; justify-content: center; }
.xyj-scene-summary { margin: 18px 0 0; color: #4f6266; font-size: 15px; font-weight: 600; line-height: 1.9; }
.xyj-observe-list { margin-top: 26px; border-top: 1px solid rgba(40, 71, 73, .16); padding-top: 18px; }
.xyj-observe-list > p { margin: 0; color: #a33c30; font-size: 12px; font-weight: 900; letter-spacing: .1em; }
.xyj-observe-list ul { display: grid; margin: 11px 0 0; padding: 0; gap: 8px; list-style: none; }
.xyj-observe-list li { position: relative; padding-left: 15px; color: #506267; font-size: 13px; font-weight: 600; line-height: 1.65; }
.xyj-observe-list li::before { position: absolute; top: .62em; left: 0; width: 5px; height: 5px; border-radius: 50%; background: #b99147; content: ''; }
.xyj-memory-line { margin: 22px 0 0; border-left: 2px solid #b99147; padding: 5px 0 5px 12px; color: #17343a; font-family: 'Kaiti', 'STKaiti', serif; font-size: 17px; font-weight: 700; line-height: 1.55; }
.xyj-memory-line span { display: block; margin-bottom: 4px; color: #a33c30; font-family: 'Noto Sans SC', sans-serif; font-size: 10px; font-weight: 900; letter-spacing: .13em; }
.xyj-scene-actions { display: flex; min-height: 62px; align-items: center; justify-content: space-between; border-bottom: 1px solid rgba(40, 71, 73, .18); padding: 0 2px; }
.xyj-scene-actions button, .xyj-self-check button { min-height: 38px; border: 1px solid rgba(23, 63, 66, .35); border-radius: 4px; padding: 0 14px; color: #174246; background: transparent; cursor: pointer; font-size: 13px; font-weight: 800; transition: .18s ease; }
.xyj-scene-actions button:hover, .xyj-self-check button:hover { color: #fff9e8; border-color: #a33c30; background: #a33c30; }
.xyj-scene-actions button:disabled { cursor: not-allowed; opacity: .32; }
.xyj-scene-actions span { color: #6b797a; font-size: 13px; font-weight: 800; }
.xyj-insight-grid { display: grid; margin-top: 42px; grid-template-columns: 1.1fr .9fr; border-top: 2px solid #1a4145; }
.xyj-relationship, .xyj-evidence { padding: 32px clamp(22px, 4vw, 44px); background: rgba(250, 251, 248, .93); }
.xyj-evidence { border-left: 1px solid rgba(40, 71, 73, .18); background: #eef2ef; }
.xyj-relationship-line { display: grid; margin-top: 25px; grid-template-columns: 1fr 88px 1fr; align-items: center; gap: 12px; }
.xyj-relationship-line div { border-top: 1px solid rgba(40, 71, 73, .32); padding-top: 12px; }
.xyj-relationship-line b { display: block; color: #173f42; font-family: 'Kaiti', 'STKaiti', serif; font-size: 20px; }
.xyj-relationship-line span { display: block; margin-top: 6px; color: #657478; font-size: 13px; font-weight: 600; line-height: 1.6; }
.xyj-relationship-line i { color: #a33c30; font-size: 11px; font-style: normal; font-weight: 800; text-align: center; }
.xyj-relationship > p:last-child, .xyj-evidence > p:last-child { margin: 24px 0 0; color: #55666a; font-size: 14px; font-weight: 600; line-height: 1.8; }
.xyj-evidence blockquote { margin: 25px 0 0; border-left: 2px solid #b99147; padding-left: 15px; color: #213c40; font-family: 'Kaiti', 'STKaiti', serif; font-size: 20px; font-weight: 700; line-height: 1.7; }
.xyj-answer-board { margin-top: 42px; border-top: 2px solid #1a4145; padding: 32px clamp(22px, 4vw, 44px) 38px; background: #f9fbf8; }
.xyj-answer-columns { display: grid; margin-top: 27px; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.xyj-answer-columns > div { border-top: 1px solid rgba(40, 71, 73, .24); padding-top: 13px; }
.xyj-answer-columns b { color: #a33c30; font-size: 13px; font-weight: 900; }
.xyj-answer-columns p { margin: 10px 0 0; color: #56676a; font-size: 14px; font-weight: 600; line-height: 1.8; }
.xyj-self-check { display: grid; margin-top: 42px; grid-template-columns: 1fr auto; align-items: center; gap: 26px; border: 1px solid rgba(185, 145, 71, .42); border-left: 4px solid #a33c30; padding: 28px clamp(22px, 4vw, 42px); background: #fffdf7; }
.xyj-self-check h2 { max-width: 760px; font-size: clamp(21px, 2.5vw, 28px); }
.xyj-self-check-answer { grid-column: 1 / -1; margin: -6px 0 0; color: #56676a; font-size: 14px; font-weight: 600; line-height: 1.8; }
@media (max-width: 760px), (orientation: portrait) { .xyj-lesson { padding: 0 0 88px; } .xyj-lesson-hero, .xyj-storyboard-overview { border-right: 0; border-left: 0; border-radius: 0; } .xyj-lesson-hero, .xyj-lesson-hero-content { min-height: 290px; } .xyj-lesson-hero-content { justify-content: end; padding: 28px 20px; } .xyj-lesson-question { font-size: 14px; } .xyj-lesson-intro { display: block; padding: 34px 16px 18px; } .xyj-lesson-intro > p { margin-top: 14px; font-size: 13px; } .xyj-scene-nav { overflow-x: auto; grid-template-columns: repeat(5, 132px); } .xyj-scene-nav button { min-height: 62px; } .xyj-scene-stage { display: block; margin-top: 18px; border-right: 0; border-left: 0; } .xyj-scene-art { min-height: 390px; } .xyj-scene-copy { padding: 28px 20px 32px; } .xyj-scene-actions { padding: 0 14px; } .xyj-insight-grid { display: block; margin-top: 30px; } .xyj-evidence { border-top: 1px solid rgba(40, 71, 73, .18); border-left: 0; } .xyj-answer-board { margin-top: 30px; } .xyj-answer-columns { grid-template-columns: 1fr; gap: 18px; } .xyj-self-check { display: flex; margin: 30px 12px 0; flex-direction: column; align-items: stretch; gap: 20px; } .xyj-self-check button { width: 100%; } }