/* Confirmed stem and tool landings. Scoped below the existing tool workspace. */
#seo-landing {width:min(1180px,100%);max-width:100%;min-width:0;margin:34px auto 0;text-align:left;color:#f8fafc}
#seo-landing .stem-story {--stem-ink:#f8fafc;--stem-soft:#c4cddb;--stem-surface:#1a2637;--stem-edge:#354458;--stem-accent:#ffad6e}
.stem-story *{box-sizing:border-box;min-width:0}
.stem-story img{display:block;max-width:100%}
.stem-story :is(h2,h3,p,a){overflow-wrap:anywhere}
.stem-story h2,.stem-story h3,.stem-story p{margin:0}
.stem-story h2{font-size:clamp(30px,3.35vw,46px);font-weight:750;line-height:1.13;letter-spacing:-.03em;text-wrap:balance}
.stem-story h3{font-size:clamp(25px,2.6vw,34px);line-height:1.18;letter-spacing:-.025em;text-wrap:balance}
.stem-story p{color:var(--stem-soft);font-size:16px;line-height:1.78;text-wrap:pretty;max-width:70ch}
.stem-story a{color:inherit;text-decoration:none}
.stem-story button,.stem-story a,.stem-story summary{touch-action:manipulation}
.stem-story button{font:inherit;cursor:pointer}
.stem-story :is(a,button,input,summary):focus-visible{outline:3px solid #ffad6e;outline-offset:4px}
.stem-story section{scroll-margin-top:30px}
.stem-jump{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 32px;padding:8px 0 32px;margin-bottom:60px;border-bottom:1px solid var(--stem-edge)}
.stem-jump a{display:flex;align-items:center;min-height:44px;font-size:14px;color:var(--stem-soft)}
.stem-jump a:hover{color:var(--stem-accent)}
.stem-section-head{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:end;gap:64px;margin-bottom:36px}
.stem-intro-label{display:block;color:var(--stem-accent);font-size:14px;font-weight:650;margin-bottom:16px}
.stem-listen{margin-bottom:108px}
.stem-listening-room{display:grid;grid-template-columns:38% 62%;background:var(--stem-surface);border-radius:12px;overflow:hidden}
.stem-record{position:relative;min-height:450px;isolation:isolate;background:#25313c}
.stem-record>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.stem-record:after{content:"";position:absolute;inset:35% 0 0;background:linear-gradient(transparent,rgba(9,16,25,.96));z-index:0}
.stem-record-caption{position:absolute;bottom:30px;left:30px;right:26px;z-index:1}
.stem-record-caption h3{font-size:29px;margin:8px 0}
.stem-record-caption span{font-size:13px;color:#e2e8f0}
.stem-deck{display:flex;flex-direction:column;padding:34px 36px 24px;min-width:0}
.stem-track-list{display:flex;flex-direction:column;gap:4px}
.stem-track-list button{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;min-height:54px;padding:6px 12px;border:0;border-radius:6px;background:transparent;color:#e2e8f0;text-align:left;font-size:16px;font-weight:600}
.stem-track-list button:hover{background:#2c3b4f}
.stem-track-list button[data-current="true"]{background:#304055;color:#fff}
.stem-row-play{flex:0 0 38px;height:38px;border-radius:50%;display:grid;place-items:center;background:#35475e;color:#e2e8f0;pointer-events:none}
.stem-row-play svg{width:20px;height:20px;fill:currentColor}
.stem-track-list button[aria-pressed="true"] .stem-row-play{background:#ffad6e;color:#172334}
.stem-track-list button[aria-busy="true"] .stem-row-play{opacity:.65}
.stem-deck .stem-now{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:5px 16px;margin:24px 0 6px}
.stem-now>span{color:var(--stem-soft);font-size:12px}
.stem-now strong{font-size:14px;font-weight:650;color:var(--stem-accent)}
.stem-transport{display:flex;align-items:center}
.stem-timeline{min-width:0;flex:1}
.stem-timeline input{appearance:none;-webkit-appearance:none;width:100%;height:28px;margin:0;padding:0;border:0;background:transparent;cursor:pointer}
.stem-timeline input::-webkit-slider-runnable-track{height:5px;border-radius:6px;background:linear-gradient(to right,#ffad6e var(--seek-progress,0%),#526175 var(--seek-progress,0%))}
.stem-timeline input::-moz-range-track{height:5px;border-radius:6px;background:linear-gradient(to right,#ffad6e var(--seek-progress,0%),#526175 var(--seek-progress,0%))}
.stem-timeline input::-webkit-slider-thumb{appearance:none;width:13px;height:13px;border:0;border-radius:50%;background:#ffad6e;margin-top:-4px}
.stem-timeline input::-moz-range-thumb{width:13px;height:13px;border:0;border-radius:50%;background:#ffad6e}
.stem-timeline>div{display:flex;justify-content:space-between;color:#c4cddb;font-size:12px;font-variant-numeric:tabular-nums}
.stem-story .stem-switch-note{font-size:13px;margin:16px 0 28px}
.stem-demo-bottom{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-top:auto;border-top:1px solid #405065;padding-top:20px;font-size:12px;color:#c4cddb}
.stem-demo-bottom a{font-size:13px;font-weight:650;color:#ffad6e;white-space:nowrap;min-height:44px;display:flex;align-items:center;gap:10px}
.stem-story .stem-audio-error{color:#fecaca;font-size:13px;margin:0 0 12px}
.stem-story .stem-caption{font-size:13px;margin-top:17px;max-width:90ch;line-height:1.65}
.stem-features{margin-bottom:110px}
.stem-feature-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:76px;align-items:center;margin-top:60px}
.stem-feature-reverse .stem-feature-copy{grid-column:2;grid-row:1}
.stem-feature-reverse .stem-guitar-visual{grid-column:1;grid-row:1}
.stem-feature-copy p{margin-top:18px;font-size:15px;line-height:1.8}
.stem-text-link{display:inline-flex;align-items:center;gap:16px;font-size:14px;font-weight:650;color:var(--stem-accent)!important;min-height:48px;margin-top:12px}
.stem-text-link:hover{text-decoration:underline}
.stem-pair-visual{height:350px;position:relative;overflow:hidden;border-radius:10px;background:#080d14}
.stem-pair-visual>img{width:100%;height:100%;object-fit:cover;object-position:50% 38%}
.stem-output-pair{position:absolute;bottom:18px;left:18px;right:18px;display:grid;grid-template-columns:1fr 1fr;gap:1px;background:#526175;border-radius:7px;overflow:hidden}
.stem-output-pair>div{padding:17px;background:#182334}
.stem-output-pair span{font-size:12px;color:#ffad6e;float:right;font-variant-numeric:tabular-nums}
.stem-output-pair strong{font-size:18px;display:block;font-weight:650}
.stem-output-pair small{display:block;color:#c4cddb;font-size:12px;margin-top:5px}
.stem-guitar-visual{position:relative;isolation:isolate;height:350px;border-radius:10px;overflow:hidden;background:#233040}
.stem-guitar-visual img{width:100%;height:100%;object-fit:cover;object-position:50% 45%}
.stem-guitar-visual:after{content:"";position:absolute;inset:25% 0 0;background:linear-gradient(transparent,rgba(7,13,22,.92))}
.stem-guitar-visual>div{position:absolute;bottom:25px;left:28px;z-index:1}
.stem-guitar-visual strong{display:block;font-size:27px;line-height:1.18;margin-top:8px;font-weight:700}
.stem-guitar-visual span{font-size:12px;color:#ffcca5}
.stem-result-sample{padding:26px;background:#f1f5f9;color:#182334;border-radius:10px}
.stem-result-source{display:flex;align-items:center;gap:12px;padding-bottom:20px}
.stem-result-source img{width:56px;height:56px;border-radius:5px;object-fit:cover}
.stem-result-source>div{min-width:0;flex:1}
.stem-result-source strong{font-size:15px;display:block}
.stem-result-source>div span{font-size:12px;color:#526175;display:block;margin-top:4px}
.stem-completed{font-size:11px;color:#1d604f}
.stem-result-list{border-top:1px solid #cbd5e1}
.stem-result-list button{border:0;border-bottom:1px solid #cbd5e1;background:transparent;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:15px 0;width:100%;text-align:left;min-height:49px;color:#182334}
.stem-result-list button span:first-child{font-size:14px;font-weight:650}
.stem-result-list button span:last-child{font-size:12px;color:#a63b0b}
.stem-result-list button:hover{color:#a63b0b;background:#e7edf3}
.stem-story .stem-result-sample>p{font-size:12px;color:#526175;margin-top:15px}
.stem-uses{margin-bottom:108px}
.stem-use-spread{display:grid;grid-template-columns:1.15fr 1fr;gap:48px}
.stem-use-main{position:relative;isolation:isolate;min-height:530px;border-radius:10px;overflow:hidden;background:#26323d}
.stem-use-main>img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.stem-use-main:after{content:"";position:absolute;inset:15% 0 0;background:linear-gradient(transparent,rgba(7,13,22,.96));z-index:0}
.stem-use-main>div{position:absolute;bottom:30px;left:30px;right:30px;z-index:1}
.stem-use-main h3{font-size:31px}
.stem-story .stem-use-main p{color:#e2e8f0;font-size:15px;line-height:1.7;margin-top:15px}
.stem-use-main>div>span{display:block;color:#ffbd8b;font-size:12px;margin-top:18px}
.stem-use-notes{display:flex;flex-direction:column;justify-content:center}
.stem-use-notes article{padding:28px 0}
.stem-use-notes article+article{border-top:1px solid var(--stem-edge)}
.stem-use-category{font-size:13px;color:#ffad6e;display:block;margin-bottom:13px}
.stem-use-notes h3{font-size:27px}
.stem-story .stem-use-notes p{font-size:15px;margin-top:15px}
.stem-use-mode{display:block;font-size:12px;color:#e2e8f0;margin-top:16px}
.stem-how{margin-bottom:90px}
.stem-steps{display:grid;grid-template-columns:repeat(3,1fr);list-style:none;padding:0;margin:40px 0 0;gap:40px}
.stem-steps li{border-top:1px solid #526175;padding-top:22px}
.stem-step-number{display:block;color:#ffad6e;font-size:18px;margin-bottom:22px}
.stem-steps h3{font-size:22px}
.stem-story .stem-steps p{font-size:14px;line-height:1.8;margin-top:15px}
.stem-step-source{display:flex;gap:10px;align-items:center;margin-top:24px;padding:14px;background:#1a2637;border-radius:6px;font-size:12px}
.stem-step-source img{width:42px;height:42px;border-radius:4px;object-fit:cover}
.stem-step-source small{display:block;margin-top:5px;color:#c4cddb;font-size:11px}
.stem-step-options{display:flex;flex-wrap:wrap;gap:6px;margin-top:24px}
.stem-step-options span{border:1px solid #526175;border-radius:5px;font-size:11px;padding:6px 8px}
.stem-step-options span:first-child{color:#ffbd8b;border-color:#aa5d2b;background:#35271f}
.stem-step-results{display:flex;justify-content:space-between;align-items:center;min-height:48px;padding:12px 16px;background:#1a2637;border-radius:6px;margin-top:24px;font-size:13px}
.stem-plans{display:grid;grid-template-columns:.9fr 1.1fr;gap:55px;background:#1a2637;padding:36px;border-radius:10px;margin-bottom:100px;align-items:center}
.stem-plans h2{font-size:31px}
.stem-story .stem-plans p{font-size:14px;margin-top:15px}
.stem-plan-table>div{display:grid;grid-template-columns:1fr 62px 52px;align-items:center;gap:15px;min-height:58px;border-bottom:1px solid #405065;font-size:13px}
.stem-plan-table>div:first-child{font-size:11px;color:#c4cddb;min-height:32px}
.stem-plan-table>div:last-child{border-bottom:0}
.stem-plan-table strong{font-weight:600}
.stem-plan-table b,.stem-plan-table [role="columnheader"]:last-child{text-align:right}
.stem-plan-table b{color:#ffad6e;font-size:18px;font-weight:600}
.stem-faq-section{display:grid;grid-template-columns:.8fr 1.2fr;gap:80px;margin-bottom:100px}
.stem-faq-intro>p{margin-top:20px;font-size:15px}
.stem-quality-note{margin-top:38px}
.stem-quality-note h3{font-size:19px}
.stem-story .stem-quality-note p{font-size:14px;margin-top:12px}
.stem-questions details{border-top:1px solid #405065}
.stem-questions details:last-child{border-bottom:1px solid #405065}
.stem-questions summary{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:68px;list-style:none;cursor:pointer;font-size:15px;font-weight:600;padding:16px 0}
.stem-questions summary::-webkit-details-marker{display:none}
.stem-questions summary:after{content:"+";color:#ffad6e;font-size:23px;flex:0 0 16px;font-weight:400}
.stem-questions details[open] summary:after{content:"−"}
.stem-story .stem-questions p{font-size:14px;padding:0 26px 24px 0;line-height:1.8}
.stem-last-call{padding:48px;background:#f3f4f6;color:#172334;display:flex;align-items:center;justify-content:space-between;gap:48px;border-radius:10px}
.stem-last-call h2{font-size:38px}
.stem-story .stem-last-call p{color:#4b5563;font-size:15px;margin-top:18px;max-width:52ch}
.stem-primary-link{display:inline-flex;align-items:center;gap:24px;justify-content:center;min-height:52px;padding:14px 22px;background:#c2410c;border-radius:7px;color:#fff!important;white-space:nowrap;font-size:15px;font-weight:650}
.stem-primary-link:hover{background:#9a3412}
.stem-related{display:flex;flex-wrap:wrap;align-items:center;gap:20px 34px;margin:28px 0 0;padding:20px 0}
.stem-related>span{font-size:12px;color:#c4cddb}
.stem-related a{font-size:14px;min-height:44px;display:flex;gap:16px;align-items:center}
.stem-related a:hover{color:#ffad6e}
@media(max-width:1000px){.stem-section-head{gap:36px}.stem-deck{padding:25px}.stem-track-buttons{gap:0}.stem-track-buttons button{padding:10px}.stem-feature-row{gap:38px}.stem-feature-copy h3{font-size:29px}.stem-use-spread{gap:30px}.stem-faq-section{gap:38px}.stem-plans{gap:30px;padding:28px}.stem-last-call{padding:32px;gap:30px}.stem-last-call h2{font-size:32px}}
@media(max-width:760px){#seo-landing{margin-top:26px}.stem-jump{justify-content:flex-start;gap:0 24px;margin-bottom:36px;padding-bottom:20px}.stem-jump a{font-size:12px}.stem-section-head{grid-template-columns:1fr;gap:20px;margin-bottom:26px}.stem-story h2{font-size:34px}.stem-section-head p{font-size:15px}.stem-listening-room{grid-template-columns:1fr}.stem-record{min-height:230px}.stem-record>img{object-position:center 42%}.stem-record-caption{bottom:24px;left:24px}.stem-record-caption h3{font-size:27px}.stem-deck{padding:22px}.stem-now{margin:26px 0 18px}.stem-now h3{font-size:31px}.stem-now p{min-height:0}.stem-demo-bottom{padding-top:12px;gap:12px}.stem-demo-bottom>span{max-width:18ch;line-height:1.6}.stem-demo-bottom a{white-space:normal}.stem-listen,.stem-features,.stem-uses,.stem-how,.stem-plans,.stem-faq-section{margin-bottom:64px}.stem-feature-row{grid-template-columns:1fr;gap:25px;margin-top:42px}.stem-feature-reverse .stem-feature-copy,.stem-feature-reverse .stem-guitar-visual{grid-column:auto;grid-row:auto}.stem-feature-copy h3{font-size:29px}.stem-feature-copy p{font-size:15px}.stem-pair-visual,.stem-guitar-visual{height:310px}.stem-use-spread{grid-template-columns:1fr;gap:8px}.stem-use-main{min-height:430px}.stem-use-notes{display:grid;grid-template-columns:1fr 1fr;gap:24px}.stem-use-notes article+article{border-top:0}.stem-use-notes h3{font-size:24px}.stem-steps{grid-template-columns:1fr;gap:26px;margin-top:28px}.stem-steps li{position:relative;padding:22px 0 0 38px}.stem-step-number{position:absolute;left:0;top:20px}.stem-steps h3{font-size:23px}.stem-step-source,.stem-step-options,.stem-step-results{max-width:360px;margin-top:16px}.stem-plans{grid-template-columns:1fr;padding:25px;gap:24px}.stem-plans h2{font-size:29px}.stem-faq-section{grid-template-columns:1fr;gap:30px}.stem-quality-note{margin-top:25px}.stem-faq-intro h2 br{display:none}.stem-last-call{display:block;padding:28px}.stem-last-call h2{font-size:32px}.stem-last-call .stem-primary-link{margin-top:26px}.stem-related{gap:8px 24px}.stem-related>span{flex-basis:100%}}
@media(max-width:440px){.stem-record{min-height:210px}.stem-track-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:5px}.stem-track-buttons button{font-size:13px}.stem-deck{padding:20px 18px}.stem-transport{gap:16px}.stem-play{width:50px;height:50px;flex-basis:50px}.stem-story h2{font-size:31px}.stem-pair-visual,.stem-guitar-visual{height:270px}.stem-output-pair{left:12px;right:12px;bottom:12px}.stem-output-pair>div{padding:13px 11px}.stem-output-pair strong{font-size:15px}.stem-output-pair small{font-size:10px}.stem-result-sample{padding:20px}.stem-completed{display:none}.stem-use-main{min-height:430px}.stem-use-main>div{left:24px;right:24px;bottom:26px}.stem-use-main h3{font-size:28px}.stem-use-notes{display:block}.stem-use-notes article+article{border-top:1px solid #405065}.stem-plans{padding:22px 18px}.stem-plan-table>div{grid-template-columns:1fr 52px 38px;gap:8px;font-size:12px}.stem-faq-section{gap:24px}.stem-last-call{padding:26px 22px}.stem-last-call h2{font-size:29px}.stem-primary-link{width:100%}}
@media(max-width:440px){.stem-record{min-height:145px}.stem-record-caption{bottom:18px;left:20px}.stem-record-caption h3{font-size:25px;margin:5px 0}.stem-record-caption span{font-size:11px}.stem-deck{padding:16px 18px}.stem-now{margin:18px 0}.stem-now h3{font-size:27px;margin:5px 0 10px}.stem-now p{font-size:14px;line-height:1.6}.stem-story .stem-switch-note{margin:13px 0 18px;font-size:12px}.stem-section-head p{font-size:14px;line-height:1.75}}
@media(prefers-reduced-motion:reduce){.stem-story *{scroll-behavior:auto!important;transition:none!important}}
@media(max-width:760px){
  /* Keep real content inside the phone gutters; do not mask clipped text. */
  #seo-landing{width:calc(100% - 8px)}
  .stem-track-list button{min-height:50px;padding:5px 10px}
  .stem-row-play{flex-basis:36px;height:36px}
  .stem-deck .stem-now{margin-top:20px}
}
/* 步骤 10 工具页落地区块（_tool_landing.html）：复用上面的 stem-* 版式，视觉格只用文字卡，不加图片。 */
.stem-use-notes.tool-use-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px}
.stem-use-notes.tool-use-grid article{padding:24px 0 0;border-top:1px solid var(--stem-edge)}
.tool-text-card{padding:26px;background:#f1f5f9;border-radius:10px}
.tool-text-card .stem-output-pair{position:static}
.tool-card-title{display:block;font-size:15px;padding-bottom:14px}
.tool-card-list{list-style:none;margin:0;padding:0;border-top:1px solid #cbd5e1}
.tool-card-list li{display:flex;justify-content:space-between;align-items:baseline;gap:20px;min-height:49px;padding:14px 0;border-bottom:1px solid #cbd5e1;font-size:14px}
.tool-card-list span{font-weight:650}
.tool-card-list strong{font-weight:500;color:#526175;text-align:right}
.tool-compare{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:#526175;border-radius:10px;overflow:hidden}
.tool-compare>div{padding:24px;background:#182334}
.tool-compare strong,.tool-example strong{display:block;font-size:13px;font-weight:650;color:var(--stem-accent);margin-bottom:12px}
.stem-story .tool-compare p,.stem-story .tool-example p{font-size:15px;line-height:1.8;color:#e2e8f0}
.tool-cue{align-self:flex-start;min-height:44px;margin-top:10px;padding:0 4px;border:0;background:transparent;color:var(--stem-accent);font-size:14px;font-weight:650}
.tool-cue:hover{text-decoration:underline}
.tool-example{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.tool-example>div{padding:28px;background:var(--stem-surface);border-radius:10px}
@media(max-width:760px){.stem-use-notes.tool-use-grid{grid-template-columns:1fr;gap:0}.stem-use-notes.tool-use-grid article{padding:24px 0}.tool-compare,.tool-example{grid-template-columns:1fr}.tool-text-card,.tool-compare>div,.tool-example>div{padding:18px}}