.p4-player{position:relative;background:#111;overflow:hidden;isolation:isolate;width:100%;color:white}.p4-player video{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:contain;max-height:none;border:0;border-radius:0;margin:0;background:#101218}.p4-operation{max-width:440px;margin-inline:auto}.p4-operation video{aspect-ratio:886/1920}.p4-overlay{position:absolute;inset:0;z-index:2;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:18px;border:0;background:linear-gradient(0deg,#0007,transparent 65%);color:white;font-family:inherit;font-size:16px;font-weight:500;line-height:1.5;cursor:pointer}.p4-play-icon{width:76px;height:76px;border:1px solid #ffffff80;border-radius:50%;display:grid;place-items:center;font-size:23px;background:#ffffff20;backdrop-filter:blur(12px);padding-left:4px}.p4-player.is-playing .p4-overlay{opacity:0;pointer-events:none}.p4-controls{position:absolute;z-index:3;bottom:0;left:0;right:0;display:flex;align-items:center;gap:14px;padding:22px;background:linear-gradient(transparent,#000d);opacity:0;transition:opacity .18s}.p4-player:hover .p4-controls,.p4-player:focus-within .p4-controls,.p4-player.is-playing .p4-controls{opacity:1}.p4-controls button{color:#fff;background:#ffffff12;border:1px solid #ffffff40;border-radius:5px;min-width:44px;min-height:44px;padding:0 12px;cursor:pointer;font:inherit;font-size:14px;white-space:nowrap}.p4-time{font:12px ui-monospace,monospace;white-space:nowrap}.p4-controls input{flex:1;min-width:24px;width:100%;accent-color:var(--player-accent,#fff);min-height:44px}.p4-status{position:absolute;z-index:4;inset:auto 20px 85px;background:#111e;color:#fff;padding:15px;font-size:14px;line-height:1.7}.p4-status[hidden]{display:none}.p4-status a{color:white;text-decoration:underline}.p4-player:fullscreen{display:flex;align-items:center;justify-content:center;background:black;height:100vh}.p4-player:fullscreen video{height:100%;object-fit:contain}.p4-player.is-loading:after{content:'正在加载…';position:absolute;top:25px;right:25px;background:#000b;padding:8px 15px;color:white;font-size:14px;z-index:4}.p4-player button:focus-visible,.p4-player input:focus-visible{outline:3px solid #fff;outline-offset:-4px}@media(max-width:600px){.p4-controls{padding:8px;gap:5px;opacity:1}.p4-controls button{padding:0 8px;font-size:12px}.p4-time{font-size:10px}.p4-play-icon{width:60px;height:60px}.p4-overlay{padding-bottom:35px}.p4-player video{min-height:180px}.p4-operation video{min-height:0}}@media(prefers-reduced-motion:reduce){.p4-controls{transition:none}}
/* Legal policies contain full provider URLs; allow them to wrap on small screens. */
.legal-approved{overflow-wrap:anywhere}

@media(max-width:600px){.p4-controls{display:grid;grid-template-columns:44px minmax(40px,1fr) 44px 44px;gap:4px}.p4-controls.has-captions{grid-template-columns:44px minmax(40px,1fr) 44px 44px 44px}.p4-time{grid-column:1/-1;grid-row:1;min-height:14px}.p4-controls button{padding:0;min-width:44px}.p4-overlay{padding-bottom:60px}}

body{background:#f5f3ed;color:#242b31}.header,.header.shell{background:#f5f3ed;color:#242b31;border-bottom:2px solid #252d35}.header a{color:inherit}.header .brand{font-size:25px}.zz-home{max-width:1440px;margin:auto}.zz-edition{display:flex;justify-content:space-between;padding:25px 6vw 18px;border-bottom:1px solid #c4c4bb;font-size:12px;color:#5b645f;letter-spacing:.03em}.zz-cover{display:grid;grid-template-columns:.55fr 1.4fr .9fr;gap:4vw;padding:65px 6vw 80px;border-bottom:2px solid #252d35}.zz-cover aside{border-right:1px solid #c6c8bf;padding:15px 25px 20px 0}.zz-cover aside>span,.zz-cover-note>span{font-size:12px;color:#7b6045}.zz-cover aside>p{font:22px/1.8 'Songti SC',serif;margin:20px 0 35px}.zz-cover aside nav{display:flex;flex-direction:column;gap:12px;font-size:13px;color:#535f58}.zz-cover aside nav a{min-height:44px;display:flex;align-items:center}.zz-cover-title h1{font:500 clamp(65px,7.2vw,104px)/1.25 'Songti SC',STSong,serif;letter-spacing:-.08em;margin:0 0 30px}.zz-cover-title h1 i{font-style:normal;color:#987149}.zz-cover-title>p{font-size:16px;margin-bottom:26px}.zz-start{display:inline-flex;align-items:center;min-height:48px;padding:0 24px;color:#fff!important;background:#26313b;border:0;font-size:14px}.zz-cover-note{padding-top:30px}.zz-cover-note blockquote{font:26px/1.9 'Songti SC',serif;margin:22px 0;border-left:2px solid #a88253;padding-left:25px}.zz-cover-note p{font-size:14px;line-height:1.9;color:#687067}.zz-paper{display:grid;grid-template-columns:.65fr 1.35fr;padding:90px 8vw;gap:8vw;align-items:start}.zz-margin>span{font-size:13px;color:#886943}.zz-margin h2{font:31px/1.8 'Songti SC',serif;margin:20px 0 25px}.zz-margin a{display:inline-flex;align-items:center;min-height:44px;font-size:14px;border-bottom:1px solid #858e81}.zz-leaf{background:#fffef9;padding:45px 50px;box-shadow:0 15px 60px #323d2b0b;border:1px solid #d8dbcf;position:relative}.zz-leaf:before{content:'';position:absolute;left:-8px;top:10px;bottom:-8px;right:9px;border:1px solid #d8dbcf;background:#fffdf7;z-index:-1}.zz-book-label{font-size:12px!important;color:#7b8177;border-bottom:1px solid #d8dbcf;padding-bottom:20px;margin:0!important}.zz-leaf h3{font:31px/1.6 'Songti SC',serif;margin:30px 0}.zz-leaf>p{font:18px/2 'Songti SC',serif;margin:18px 0}.zz-depth{display:flex;border-bottom:1px solid #cbd0c3;margin-top:35px;gap:20px}.zz-depth button{border:0;background:transparent;font-size:13px;padding:10px 0;min-height:44px;color:#606f61}.zz-depth button[aria-selected=true]{border-bottom:2px solid #886943;color:#6b4b2d}.zz-leaf [role=tabpanel]{font-size:15px;line-height:1.9;color:#5c6a59;margin-top:20px}.zz-practice{display:grid;grid-template-columns:1fr 1fr;gap:9vw;padding:75px 8vw 100px;background:#e9eadf;align-items:center}.zz-action-card{border:1px solid #bec6b2;padding:30px 35px;background:#f5f5ed;transform:rotate(-2deg);box-shadow:8px 12px 0 #d5d9c8}.zz-action-card>span{font-size:12px;color:#63705b}.zz-action-card h3{font:500 40px/1.5 'Songti SC',serif;margin:25px 0}.zz-action-card dl{font-size:14px}.zz-action-card dl div{display:grid;grid-template-columns:90px 1fr;gap:18px;border-top:1px solid #cdd3c0;padding:14px 0}.zz-action-card dt{color:#647159}.zz-action-card dd{margin:0;line-height:1.8}.zz-small-action{padding:20px 0 0;border-top:1px solid #cdd3c0}.zz-small-action p{font-size:13px;color:#63705b}.zz-small-action strong{display:block;font:26px/1.7 'Songti SC',serif;margin-top:8px}.zz-practice-copy>p:first-child{font-size:13px;color:#63705b}.zz-practice-copy h2{font:36px/1.6 'Songti SC',serif;margin:20px 0}.zz-practice-copy>p{font-size:16px;line-height:1.9;color:#586750}.zz-practice-copy>a{min-height:44px;display:table;align-content:center;border-bottom:1px solid #83917a;font-size:14px;margin-top:20px}.zz-film{background:#202a32;color:#f7f3e6;padding:65px 6vw 35px}.zz-film-title{display:flex;justify-content:space-between;align-items:end;padding-bottom:35px}.zz-film-title span{font:14px 'Songti SC',serif}.zz-film-title h2{font:34px/1.6 'Songti SC',serif}.zz-film .p4-player{border:1px solid #61707a;--player-accent:#d4b17c}.zz-film>p{font:13px/1.8 'Songti SC',serif;color:#c2c5bc;margin-top:18px;text-align:right}.zz-colophon{padding:80px 8vw;display:flex;justify-content:space-between;gap:30px;align-items:center}.zz-colophon h2{font:60px/1.4 'Songti SC',serif}.zz-colophon p{font-size:16px;margin-bottom:25px}.zz-colophon>div>a:last-child{display:block;font-size:14px;margin-top:16px;min-height:44px;align-content:center}.page-top .eyebrow{display:none}.footer{background:#e7e8df}.zz-home [hidden]{display:none!important}@media(max-width:800px){.zz-edition{padding:18px 6vw;font-size:12px}.zz-edition>span:last-child{display:none}.zz-cover{grid-template-columns:1fr;gap:25px;padding:32px 7vw 45px}.zz-cover aside{border:0;padding:0;display:flex;gap:15px;align-items:center}.zz-cover aside>p{font-size:15px;margin:0}.zz-cover aside>p br{display:none}.zz-cover aside nav{display:none}.zz-cover-title h1{font-size:76px;margin-bottom:20px}.zz-cover-title>p{font-size:16px}.zz-cover-note{padding:12px 0 0;border-top:1px solid #c6c8bf;margin-top:5px}.zz-cover-note blockquote{font-size:23px;margin:15px 0}.zz-cover-note p{font-size:14px}.zz-cover-note p br{display:none}.zz-paper{grid-template-columns:1fr;padding:55px 6vw;gap:25px}.zz-margin h2{font-size:30px;margin:12px 0}.zz-margin h2 br{display:none}.zz-leaf{padding:27px 24px}.zz-leaf h3{font-size:28px}.zz-leaf>p{font-size:18px}.zz-depth{gap:12px}.zz-depth button{font-size:12px}.zz-practice{grid-template-columns:1fr;padding:45px 7vw 60px;gap:45px}.zz-action-card{padding:25px}.zz-action-card h3{font-size:36px}.zz-practice-copy h2{font-size:33px}.zz-film{padding:35px 4vw 20px}.zz-film-title{gap:20px;align-items:start;padding-bottom:25px}.zz-film-title h2{font-size:27px}.zz-film-title span{font-size:12px;min-width:50px;padding-top:8px}.zz-colophon{padding:50px 7vw;display:block}.zz-colophon h2{font-size:45px;margin-bottom:25px}.zz-colophon h2 br{display:none}.zz-colophon p{font-size:16px}}
.header .nav-cta{background:#26313b;color:#fff!important;border-color:#26313b}

/* Keep playback controls legible over light opening frames. */
.p4-play-icon{background:#17212be6;border-color:#ffffffcc;backdrop-filter:none}
.p4-overlay>span:last-child{padding:4px 10px;border-radius:6px;background:#17212be6;color:#fff}

/* Keep short Chinese headings readable without leaving a trailing word alone. */
.page-top h1,.reading-article h2,.start-row h2{ text-wrap:balance; }
@media(max-width:800px){.zz-colophon h2 br{display:initial}}

.step-evidence{grid-column:2/4;margin:0}.step-evidence img{max-height:620px;object-fit:contain;margin:auto}.step-evidence figcaption{max-width:620px;margin:16px auto 0;font-size:14px;line-height:1.8;color:#59667a}@media(max-width:800px){.step-evidence{grid-column:1/3}}

.p4-player.has-error .p4-overlay{visibility:hidden}.p4-status button{font:inherit;border:1px solid currentColor;background:transparent;color:inherit;padding:6px 10px;border-radius:8px;margin:8px 8px 0 0;cursor:pointer}

/* Keep each step's explanation beside its actual product example. */
.product-step{grid-template-columns:minmax(0,1fr) minmax(280px,.85fr);gap:60px;align-items:start}
.step-copy{display:grid;gap:24px;max-width:540px}
.step-copy .num{font-size:22px}
.step-copy h2{font-size:32px}
.step-copy p{margin:0}
.product-step>img,.product-step>.step-evidence{grid-column:auto;margin:0 auto;width:100%;max-width:360px}
.product-step>img,.step-evidence img{max-height:620px;object-fit:contain}
.step-evidence figcaption{margin-top:16px}
.legal-contents{padding:24px 0;border-block:1px solid var(--line);margin:28px 0 36px}
.legal-contents>p{font-weight:600;margin-bottom:12px}
.legal-contents ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 24px;list-style:none;padding:0;margin:0}
.legal-contents a{display:block;padding:6px 0;text-underline-offset:4px}
.legal-approved h2[id],.legal-contents{scroll-margin-top:24px}
.legal-back{margin-top:32px}
@media(max-width:800px){
  .product-step{grid-template-columns:minmax(0,1fr);gap:28px}
  .product-step>.step-copy,.product-step>img,.product-step>.step-evidence{grid-column:1}
  .step-copy{gap:16px}.step-copy h2{font-size:28px}
  .legal-contents ol{grid-template-columns:1fr}
}