@charset "UTF-8";
:root{color-scheme:light;--paper:#f4f0e5;--ink:#243d35;--muted:#66766b;--accent:#a76b37;--line:#d8d9cb}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer;background:#fff9;color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:10px 15px}button:hover{border-color:var(--accent)}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}button:disabled{cursor:default;opacity:.45}
.site-head,footer{max-width:1440px;margin:auto;padding:28px;display:flex;justify-content:space-between;gap:20px}.site-head>a:first-child{font-family:SimSun,serif;font-size:24px;letter-spacing:3px}.site-head small{display:block;font-family:"Microsoft YaHei",sans-serif;font-size:12px;letter-spacing:2px;margin-top:9px;color:var(--muted)}.site-head>a:last-child{font-size:13px;color:var(--muted)}main{max-width:1440px;margin:auto;padding:0 28px}.preview-heading{border-top:1px solid var(--line);padding:18px 0;display:flex;justify-content:space-between;gap:20px;align-items:center}.preview-heading h1{font-size:18px;font-weight:500;margin:0}.preview-heading>span{color:var(--muted);font-size:13px;white-space:nowrap}
.video-viewport{position:relative;aspect-ratio:16/9;width:100%;overflow:hidden;background:var(--paper);border-radius:4px;box-shadow:0 12px 45px #20362e12}.video-viewport:fullscreen{width:100vw;height:100vh}.video-canvas{position:absolute;left:0;top:0;width:1920px;height:1080px;transform-origin:0 0;overflow:hidden;background:var(--paper)}.landscape{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transform-origin:70% 60%;will-change:transform}.paper-wash{position:absolute;inset:0;background:linear-gradient(90deg,#f6f2e9 0%,#f6f2e9ed 34%,#f6f2e985 53%,#f6f2e90a 78%)}.video-canvas[data-kind="hero"] .paper-wash,.video-canvas[data-kind="outro"] .paper-wash{background:linear-gradient(90deg,#f6f2e9ef 0%,#f6f2e9dc 31%,#f6f2e940 54%,#f6f2e900 75%)}.video-canvas:not([data-kind="hero"]):not([data-kind="outro"]) .landscape{opacity:.2}.video-canvas:after{content:"";position:absolute;inset:38px;border:1px solid #244b3525;pointer-events:none}
.frame-head{position:absolute;top:78px;left:106px;right:106px;display:flex;justify-content:space-between;align-items:center;font-size:24px;letter-spacing:4px;z-index:2;color:#385348}.frame-head span:last-child{letter-spacing:5px;background:#f7f4ece8;border:1px solid #9aa98a40;border-radius:6px;padding:10px 18px}.scene{position:absolute;left:118px;right:118px;top:200px;bottom:245px;display:grid;grid-template-columns:790px 1fr;gap:68px;align-items:center}.scene[hidden]{display:none}.copy{position:relative;z-index:1}.kicker{font-size:26px;letter-spacing:4px;color:var(--accent);margin:0 0 28px}.scene h2{font-family:"Noto Serif CJK SC",SimSun,serif;font-size:72px;font-weight:500;line-height:1.4;letter-spacing:2px;margin:0 0 30px;white-space:pre-line}.scene .term-name{font-family:SimSun,serif;font-size:150px;letter-spacing:22px;line-height:1.15;margin:0 0 30px}.scene.hero h2{font-size:55px;line-height:1.5;margin:0 0 28px}.hero .kicker{font-size:22px;letter-spacing:7px;margin-bottom:18px}.term-meta{font-size:25px;line-height:1.8;color:var(--muted);margin:0}.thin-rule{height:2px;width:90px;background:var(--accent);margin:30px 0}.hero .visual,.outro .visual{visibility:hidden}.outro h2{font-size:78px}.outro .term-name{font-size:92px;letter-spacing:14px;color:var(--accent);margin-bottom:38px}.visual{min-width:0}.visual-note{font-size:19px;color:var(--muted);text-align:center;margin:18px 0 0;line-height:1.6}.visual svg{width:100%;height:auto;display:block;overflow:visible;font-family:"Microsoft YaHei",sans-serif}.visual svg text{fill:var(--ink)}
.angle-panel{background:#f9f6efdc;border:1px solid #b3bca870;border-radius:24px;padding:48px 36px 36px;text-align:center;box-shadow:0 16px 50px #405a3b07}.angle-number{font-family:Georgia,serif;font-size:132px;color:var(--accent);line-height:1}.angle-label{font-size:24px;letter-spacing:5px;color:var(--muted);margin:18px 0 42px}.term-track{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;border-top:2px solid #abb7a080;padding-top:24px}.term-track span{font-size:23px;line-height:1.8;position:relative}.term-track span:before{content:"";width:11px;height:11px;background:#b0b8a6;border-radius:50%;position:absolute;top:-31px;left:calc(50% - 5px)}.term-track small{display:block;font:18px Georgia;color:var(--muted)}.term-track .active{color:var(--accent);font-weight:700}.term-track .active:before{background:var(--accent);box-shadow:0 0 0 6px #b3905b22}.term-track .active small{color:var(--accent)}
.info-pair,.region-pair{display:grid;gap:24px}.info-card,.region-card{border:1px solid #aebaa37a;background:#fbf9f1e8;border-radius:18px;padding:30px 36px;position:relative;overflow:hidden}.info-card small,.region-card small{display:block;color:var(--accent);font-size:22px;letter-spacing:2px;margin-bottom:15px}.info-card strong,.region-card strong{font-size:32px;font-weight:500;line-height:1.5;display:block}.info-card:nth-child(2){border-left:5px solid var(--accent)}.region-card{padding-left:110px}.region-card:before{content:"";position:absolute;left:32px;top:45px;width:44px;height:44px;border-radius:50%;background:#d7b76470;box-shadow:0 0 0 10px #d7b76418}.region-card:first-child:before{background:#688d8150;box-shadow:0 0 0 10px #688d8115}.note-list{list-style:none;margin:0;padding:0;display:grid;gap:26px}.note-list li{font-size:32px;line-height:1.6;padding:30px 32px 30px 45px;border-left:3px solid var(--accent);background:#fbf8efe0;border-radius:0 14px 14px 0}.state-pair{display:grid;grid-template-columns:1fr 1fr;gap:24px}.state-card{background:#faf8f1de;border:1px solid #abb8a478;border-radius:24px;padding:36px 20px;text-align:center}.state-card svg{height:190px}.state-card strong{font-family:SimSun,serif;font-size:48px;display:block;margin-top:16px}.state-card span{font-size:25px;color:var(--muted);display:block;margin-top:15px}.harvest-seal{width:150px;height:150px;border:2px solid var(--accent);border-radius:50%;display:grid;place-items:center;margin:0 auto 32px;font-family:SimSun,serif;color:var(--accent);font-size:50px;letter-spacing:7px}
.caption-wrap{position:absolute;left:100px;right:100px;bottom:68px;min-height:112px;padding:20px 36px;border-top:1px solid #48594022;background:#faf8f0ee;border-radius:8px;display:flex;align-items:center;justify-content:center;z-index:3}#caption{font-size:34px;line-height:1.6;text-align:center;margin:0;max-width:100%;color:#263f35}.image-note{position:absolute;bottom:215px;right:108px;font-size:18px;color:#415e50b8;letter-spacing:2px}.progress-line{position:absolute;left:0;right:0;bottom:0;height:5px;background:#35543e14}.progress-line i{display:block;height:100%;background:var(--accent);transform-origin:left}
.playback{display:flex;gap:10px;align-items:center;margin-top:22px;font-size:13px}.playback #play{background:var(--ink);color:#fff;min-width:116px}.playback input{flex:1;min-width:70px;accent-color:var(--accent)}.playback span{font-variant-numeric:tabular-nums;color:var(--muted)}#status{font-size:13px;color:var(--muted);margin:14px 0 30px}.chapters-section{border-top:1px solid var(--line);padding:25px 0}.chapters-section h2{font-size:18px;font-weight:500}.chapters-section ol{list-style:none;margin:20px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.chapters-section button{width:100%;text-align:left;padding:18px 20px;border-radius:0;display:flex;justify-content:space-between;gap:15px;font-size:14px;line-height:1.6}.chapters-section button.active{border-color:var(--accent);background:#e8e1cd}.chapters-section small{font-size:12px;color:var(--muted);white-space:nowrap}.transcript{border-top:1px solid var(--line);padding:25px 0}.transcript summary{cursor:pointer}.transcript h3{font-size:16px;font-weight:500;margin-top:26px}.transcript p{font-size:14px;line-height:1.9;color:var(--muted)}.transcript a{text-decoration:underline;text-underline-offset:4px}footer{font-size:12px;color:var(--muted)}
.export-mode .video-viewport{position:fixed;inset:0;width:1920px;height:1080px;border-radius:0;box-shadow:none;z-index:100}.export-mode .video-canvas{transform:none!important}
@media(max-width:760px){main{padding:0 12px}.site-head,footer{padding:22px 14px}.site-head>a:first-child{font-size:20px}.preview-heading h1{font-size:15px}.preview-heading>span{font-size:12px}.playback{flex-wrap:wrap;gap:8px}.playback input{flex-basis:30%}.playback button{padding:9px}.chapters-section ol{grid-template-columns:1fr 1fr}.chapters-section button{padding:14px 10px;font-size:12px}.chapters-section small{font-size:10px}footer{gap:12px}}