:root{color-scheme:dark;--bg:#0f1115;--surface:#171a21;--card:#1d212b;--gold:#f6cd9b;--gold-hover:#ffd9a8;--text:#fff;--muted:#b8b8b8;--line:#343840;--radius:12px;scroll-behavior:smooth;scroll-padding-top:28px}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased}
::selection{background:var(--gold);color:var(--bg)}
:focus-visible{outline:3px solid var(--gold);outline-offset:5px}
*{scrollbar-color:#787066 var(--surface);scrollbar-width:thin}
a{color:var(--gold);text-underline-offset:5px;text-decoration-thickness:1px}
a:hover{color:var(--gold-hover)}
button{font:inherit;cursor:pointer}
.icon{width:18px;height:18px;flex:none;vertical-align:middle}
button,a{-webkit-tap-highlight-color:rgba(246,205,155,.15)}
img{display:block;height:auto}
figure{margin:28px 0}
figcaption{margin-top:10px;font-size:14px;color:var(--muted);line-height:1.75}
figcaption strong{color:#ddd;font-weight:500}
h1,h2,h3,p{margin:0}
h1,h2,h3{text-wrap:balance;line-height:1.35}
h2{font-size:clamp(25px,2.6vw,32px);font-weight:750;letter-spacing:-.025em}
h3{font-size:19px;line-height:1.5;font-weight:700;margin-bottom:10px}
p{max-width:72ch}
.skip-link{position:fixed;z-index:20;top:10px;left:10px;padding:10px 16px;transform:translateY(-180%);background:var(--gold);color:var(--bg)}
.skip-link:focus{transform:none}
.site-header{max-width:1320px;margin:auto;padding:20px 40px;display:flex;align-items:center;gap:28px;border-bottom:1px solid var(--line)}
.brand{font-size:24px;color:white;text-decoration:none;font-weight:750;letter-spacing:-.025em;white-space:nowrap}
.brand span{color:var(--gold)}
.header-title{color:var(--muted);font-size:14px}
.header-link{margin-left:auto;font-size:14px;text-decoration:none;min-height:44px;display:inline-flex;align-items:center;gap:12px}
.hero{max-width:1320px;margin:auto;padding:72px 40px 58px;display:grid;grid-template-columns:.83fr 1.17fr;gap:44px;align-items:center}
h1{font-size:clamp(34px,3.5vw,48px);letter-spacing:-.035em;font-weight:750;line-height:1.4}
h1 span{display:block;color:var(--gold);font-size:.76em;margin-top:8px;letter-spacing:-.025em}
.intro{margin-top:25px;font-size:17px;color:#d0d0d0}
.song-context{margin:26px 0;color:var(--muted);font-size:13px;line-height:1.8}
.song-context strong{display:block;color:#eee;font-size:16px;font-weight:600;margin-top:3px}
.song-context span{display:block}
.button{min-height:48px;padding:11px 21px;display:inline-flex;justify-content:center;align-items:center;gap:24px;border-radius:7px;text-decoration:none;font-weight:700;line-height:1.5;transition:background-color .2s ease-out}
.primary{background:var(--gold);color:var(--bg)}
.primary:hover{background:var(--gold-hover);color:var(--bg)}
.hero-figure{margin:0;min-width:0}
.shot-link{display:block;color:var(--muted);text-decoration:none;background:#090b0e;border:1px solid #3b3e45;border-radius:var(--radius);overflow:hidden}
.shot-link:hover{border-color:var(--gold);color:var(--gold)}
.shot{display:block;position:relative;overflow:hidden;aspect-ratio:var(--w) / var(--h);background:#111318}
.shot img{position:absolute;max-width:none;width:calc(100% * var(--iw,1920) / var(--w));left:calc(-100% * var(--x) / var(--w));top:calc(-100% * var(--y) / var(--h));height:auto}
.image-action{display:flex;justify-content:space-between;align-items:center;font-size:13px;padding:7px 13px;background:var(--surface);line-height:1.75}
.quick-start{max-width:1240px;margin:0 auto;display:flex;align-items:center;gap:35px;padding:20px 0;border-block:1px solid var(--line)}
.quick-start strong{font-size:15px;white-space:nowrap}
.quick-start ol{display:flex;flex-wrap:wrap;list-style:none;counter-reset:quick;margin:0;padding:0;gap:12px 25px}
.quick-start li{counter-increment:quick;font-size:14px}
.quick-start li:before{content:counter(quick);color:var(--muted);margin-right:8px;font-variant-numeric:tabular-nums}
.quick-start a{text-decoration:none}
.reading-layout{max-width:1240px;margin:0 auto;display:grid;grid-template-columns:210px minmax(0,890px);gap:55px;align-items:start}
.contents{position:sticky;top:30px;padding-top:48px}
.contents nav{display:flex;flex-direction:column;align-items:flex-start;gap:4px}
.contents p{font-size:13px;color:var(--muted);margin:0 0 13px}
.contents a{padding:6px 12px;color:var(--muted);text-decoration:none;border-radius:6px;font-size:14px;line-height:1.8;min-height:38px;border:1px solid transparent;margin-left:-12px}
.contents a:hover{color:var(--gold)}
.contents a[aria-current="location"]{background:var(--surface);color:var(--gold);border-color:var(--line)}
.chapters{min-width:0}
.chapter{padding:56px 0;border-bottom:1px solid var(--line);scroll-margin-top:15px}
.chapter-lead{color:var(--muted);font-size:17px;margin-top:14px}
.feature-list{margin:25px 0 0}
.feature-list>div{display:grid;grid-template-columns:112px minmax(0,1fr);gap:16px;padding:14px 0;border-bottom:1px solid #2a2e36}
.feature-list>div:last-child{border-bottom:0}
dt{font-weight:650;color:#f1f1f1}
dd{margin:0;color:#c8c8c8}
.tip{font-size:15px;padding:18px 21px;margin-top:24px;background:var(--surface);border-radius:8px;color:#d0d0d0;max-width:none}
.tip strong{display:block;color:var(--gold);margin-bottom:3px}
.text-columns{display:grid;grid-template-columns:1fr 1fr;gap:35px;margin-top:27px}
.text-columns p{color:#c8c8c8}
.note{font-size:14px;color:var(--muted);margin-top:21px;line-height:1.85}
.steps{list-style:none;counter-reset:steps;margin:20px 0 0;padding:0}
.steps li{counter-increment:steps;position:relative;padding-left:38px;margin-top:22px}
.steps li:before{content:counter(steps);position:absolute;left:0;top:0;color:var(--gold);font-size:18px;font-variant-numeric:tabular-nums}
.steps strong{font-size:16px;font-weight:650;display:block}
.steps span{color:#bbb;display:block;font-size:15px;margin-top:4px}
.inline-note{margin-top:32px;padding:22px 24px;border:1px solid var(--line);border-radius:var(--radius)}
.inline-note p{color:#c8c8c8;font-size:15px}
.inline-note p+p{margin-top:12px}
.inline-note strong{color:var(--gold);font-weight:600}
.settings-list{margin:23px 0 0;display:grid;grid-template-columns:.9fr 1.4fr 1fr;gap:25px}
.settings-list dt{margin-bottom:8px}
.settings-list dd{font-size:15px}
.figure-and-copy{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:40px;align-items:start;margin-top:32px}
.figure-and-copy figure{margin:0}
.compact{margin:0}
.compact>div{grid-template-columns:64px minmax(0,1fr);padding:10px 0;gap:10px;font-size:15px}
.presets-layout{grid-template-columns:minmax(0,.6fr) minmax(0,1.4fr)}
.figure-and-copy .steps{margin:0}
.figure-and-copy .steps li:first-child{margin-top:0}
.guided-layout{grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:32px}
.guided-followup{margin-top:34px}
.questions h2{margin-bottom:25px}
details{border-top:1px solid var(--line)}
summary{list-style:none;position:relative;cursor:pointer;padding:21px 38px 21px 0;font-weight:600;font-size:16px;line-height:1.75}
summary::-webkit-details-marker{display:none}
summary .icon{position:absolute;right:6px;top:25px;color:var(--gold)}
details[open] summary .vertical{display:none}
details[open] summary{color:var(--gold)}
details p{color:#c8c8c8;font-size:15px;padding:0 28px 24px 0}
.closing{padding:60px 0 75px}
.closing h2{font-size:29px}
.closing p{color:var(--muted);margin:13px 0 24px}
.closing small{display:block;font-size:13px;color:var(--muted);margin-top:14px}
.site-footer{border-top:1px solid var(--line);max-width:1320px;margin:auto;padding:26px 40px;display:flex;flex-wrap:wrap;align-items:center;gap:12px 26px;font-size:12px;color:var(--muted)}
.site-footer strong{font-weight:600;color:#ddd}
.site-footer a{gap:8px;margin-left:auto;min-height:44px;display:inline-flex;align-items:center;text-decoration:none}
.image-dialog{border:1px solid #555047;padding:0;border-radius:var(--radius);background:var(--surface);color:white;max-width:min(1140px,calc(100vw - 40px));max-height:calc(100dvh - 40px);width:100%;overflow:auto;box-shadow:0 20px 80px rgba(0,0,0,.5)}
.image-dialog::backdrop{background:rgba(0,0,0,.84)}
.dialog-toolbar{display:flex;align-items:center;justify-content:space-between;padding:10px 18px;font-size:14px;color:var(--muted);position:sticky;top:0;background:var(--surface);z-index:2;border-bottom:1px solid var(--line)}
.dialog-close{background:transparent;border:1px solid #68615a;color:var(--gold);border-radius:6px;min-height:44px;padding:6px 14px;font-size:14px}
.dialog-close .icon{margin-left:8px}
.dialog-close:hover{background:var(--card)}
.dialog-image{margin:auto;overflow-x:auto;overscroll-behavior:contain}
.dialog-hint{display:none}
.image-dialog #image-caption{padding:16px 22px;font-size:15px;line-height:1.8;max-width:none}
body:has(.image-dialog[open]){overflow:hidden}
@media(min-width:1440px){.hero{padding-top:84px;padding-bottom:72px}.hero-figure{margin-left:-8px}}
@media(max-width:1319px){.quick-start,.reading-layout{margin-inline:40px}.reading-layout{grid-template-columns:175px minmax(0,1fr);gap:40px}.hero{gap:32px}.feature-list>div{grid-template-columns:95px minmax(0,1fr)}}
@media(max-width:1050px){.reading-layout{grid-template-columns:150px minmax(0,1fr);gap:30px}.hero{grid-template-columns:.9fr 1.1fr;padding-top:48px}.quick-start{gap:22px;align-items:flex-start}.quick-start ol{gap:8px 20px}.figure-and-copy{gap:25px}.text-columns{gap:25px}.settings-list{gap:18px}}
@media(max-width:800px){:root{scroll-padding-top:90px}.site-header{padding:12px 24px;gap:20px}.header-title{display:none}.hero{padding:40px 24px;gap:30px;grid-template-columns:1fr}.hero-copy{max-width:600px}h1{font-size:38px}.intro{font-size:16px;margin-top:20px}.song-context{margin:20px 0}.hero-figure{max-width:720px}.quick-start{margin-inline:24px;padding:19px 0;display:block}.quick-start ol{margin-top:10px}.reading-layout{display:block;margin:0 24px}.contents{padding:10px 0;top:0;background:var(--bg);z-index:3;border-bottom:1px solid var(--line);margin-inline:-24px}.contents nav{flex-direction:row;align-items:center;overflow-x:auto;gap:5px;padding:4px 24px;scrollbar-width:thin}.contents p{display:none}.contents a{white-space:nowrap;margin:0;padding:8px 12px;min-height:42px}.chapter{padding:40px 0}.chapter-lead{font-size:16px}.closing{padding:45px 0 55px}.site-footer{padding:24px;gap:8px;flex-direction:column;align-items:flex-start}.site-footer a{margin:0}.image-dialog{max-width:calc(100vw - 24px);max-height:calc(100dvh - 24px)}}
@media(max-width:520px){body{font-size:15px}.brand{font-size:22px}.hero{padding-top:34px}h1{font-size:33px}h2{font-size:25px}.hero h1 span{font-size:26px}.intro br{display:none}.hero figcaption{font-size:12px}.quick-start ol{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px}.feature-list>div{grid-template-columns:78px minmax(0,1fr);gap:12px;padding:13px 0}.feature-list dd{font-size:15px}.text-columns,.settings-list{grid-template-columns:1fr;gap:25px}.settings-list>div{display:grid;grid-template-columns:95px minmax(0,1fr);gap:18px}.settings-list dt{margin:0}.figure-and-copy,.presets-layout,.guided-layout{grid-template-columns:1fr;gap:24px}.figure-and-copy figure{width:100%;max-width:336px;margin-inline:auto}.presets-layout figure{max-width:262px}.compact>div{grid-template-columns:64px minmax(0,1fr)}figure{margin:23px 0}figcaption{font-size:13px}.steps li{padding-left:31px}.steps strong{font-size:15px}.inline-note{padding:18px}.tip{padding:16px}.closing h2{font-size:25px}.closing .button{font-size:15px;padding:12px 15px;gap:10px}.dialog-toolbar{padding:8px 12px}.image-dialog #image-caption{padding:13px 16px;font-size:14px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*{transition:none!important}}
@media(max-width:520px){.dialog-image .shot{min-width:min(calc(var(--w) * 1px),780px)}.dialog-hint{display:block;padding:9px 16px;color:var(--muted);font-size:13px}}
@media print{body{background:white;color:black}.site-header,.contents,.quick-start,.image-dialog,.image-action,.header-link,.skip-link,.button{display:none}.hero,.reading-layout{display:block;margin:0;padding:0}.hero-figure{margin-top:20px}.hero{page-break-after:always}.chapter{break-inside:avoid;padding:25px 0}h1 span,a,dt,.steps li:before,.tip strong{color:#73552c}.chapter-lead,p,dd,figcaption,.note,.steps span,.feature-list dd{color:#333}.shot-link{border:0}.site-footer{color:#333}.closing{padding:24px 0}}
/* Shared feature tutorials: ordinary links preserve independent page URLs. */
:root{scroll-padding-top:84px}
.feature-navigation{position:sticky;top:0;z-index:5;background:var(--bg);border-bottom:1px solid var(--line)}
.feature-tabs{max-width:1240px;margin:auto;display:flex;gap:30px;align-items:center}
.feature-tabs a{display:flex;align-items:center;min-height:58px;padding:12px 0;color:var(--muted);text-decoration:none;border-bottom:2px solid transparent;font-size:15px;white-space:nowrap}
.feature-tabs a:hover{color:var(--gold)}
.feature-tabs a[aria-current="page"]{color:var(--gold);border-bottom-color:var(--gold);font-weight:700}
.feature-menu{display:none;border:0}
.guide-context{font-size:14px;line-height:1.8;color:var(--muted);margin:24px 0}
.hero-portrait{grid-template-columns:1fr 1fr}
.hero-portrait .hero-figure{width:100%;max-width:272px;justify-self:center;margin:0}
.contents{top:65px}
@media(max-width:1319px){.feature-tabs{margin-inline:40px;gap:24px}}
@media(max-width:1080px){
 :root{scroll-padding-top:140px}
 .site-header{gap:12px}
 .header-title{display:block;font-size:12px;white-space:nowrap}
 .feature-tabs{display:none}
 .feature-menu{display:block;position:relative;margin:0 24px}
 .feature-menu summary{display:flex;align-items:center;gap:12px;min-height:58px;padding:12px 28px 12px 0;font-size:14px}
 .feature-menu summary span{color:var(--muted);font-weight:400;white-space:nowrap}
 .feature-menu summary strong{color:var(--gold);font-size:15px;font-weight:600}
 .feature-menu summary .icon{top:20px;right:0}
 .feature-menu[open] summary .icon{transform:rotate(180deg)}
 .feature-menu nav{position:absolute;left:-24px;right:-24px;top:100%;display:flex;flex-direction:column;padding:8px 24px 16px;background:var(--surface);border-bottom:1px solid var(--line)}
 .feature-menu nav a{padding:11px 12px;min-height:48px;color:var(--muted);text-decoration:none;border-radius:6px}
 .feature-menu nav a:hover{color:var(--gold);background:var(--card)}
 .feature-menu nav a[aria-current="page"]{color:var(--gold);background:var(--card);font-weight:650}
 .contents{top:59px}
 .hero-portrait{grid-template-columns:1fr}
 .hero-portrait .hero-figure{max-width:260px;justify-self:start}
}
@media(max-width:360px){.header-title{display:none}}
@media print{.feature-navigation{display:none}}
.detail-pair{display:grid;grid-template-columns:minmax(210px,.72fr) minmax(0,1.2fr);gap:32px;align-items:start;margin:28px 0}
.detail-pair>figure{margin:0;width:100%;max-width:440px;justify-self:center}
.detail-pair .steps{margin-top:0}
.detail-pair .steps li:first-child{margin-top:0}
.detail-block>figure{margin-top:26px}
.portrait-shot{max-width:360px;margin-inline:auto}
.flow-figure{margin:30px 0;padding:22px 0;border-block:1px solid var(--line)}
.flow-figure figcaption{margin:0 0 18px;color:var(--muted);font-size:13px}
.practice-flow{list-style:none;display:flex;padding:0;margin:0;gap:24px;counter-reset:flow}
.practice-flow li{flex:1;position:relative;min-width:0;padding-top:28px;counter-increment:flow}
.practice-flow li:before{content:counter(flow);position:absolute;top:0;left:0;font-size:13px;color:var(--gold);font-variant-numeric:tabular-nums}
.practice-flow li:not(:last-child):after{content:"";position:absolute;top:8px;left:25px;right:0;border-top:1px solid #6e6050}
.practice-flow strong{display:block;color:var(--gold);font-size:16px;line-height:1.65}
.practice-flow span{display:block;margin-top:5px;font-size:14px;line-height:1.8;color:#ccc}
.table-scroll{overflow-x:auto;margin:24px 0}
.table-scroll table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.9}
.table-scroll th,.table-scroll td{text-align:left;vertical-align:top;padding:15px 15px;border-bottom:1px solid var(--line)}
.table-scroll thead th{background:var(--surface);color:var(--gold);font-weight:600}
.table-scroll tbody th{width:29%;font-weight:600;color:#eee}
.table-scroll td{color:#ccc}
.chapter-menu{display:none}
.contents>nav{max-height:calc(100dvh - 110px);overflow-y:auto;scrollbar-width:thin}
.feature-tabs{gap:2px}
.feature-tabs>a{padding-inline:16px;font-size:14px;white-space:nowrap}
@media(max-width:1080px){.feature-tabs{display:none}.feature-menu{display:block}.feature-navigation{padding-inline:24px}.contents{top:86px}.detail-pair{grid-template-columns:minmax(180px,.8fr) minmax(0,1.2fr);gap:24px}}
@media(max-width:800px){
 .contents{top:59px;padding:0 24px;z-index:4}
 .contents>nav{display:none}
 .chapter-menu{display:block;position:relative;border:0}
 .chapter-menu>summary{padding:12px 35px 12px 0;min-height:48px;font-size:14px;line-height:24px;color:var(--muted)}
 .chapter-menu>summary .icon{top:14px;right:2px}
 .chapter-menu>nav{position:absolute;left:-24px;right:-24px;top:100%;display:flex;flex-direction:column;align-items:stretch;gap:0;max-height:60dvh;overflow:auto;padding:8px 24px 18px;background:var(--surface);border-bottom:1px solid #625643}
 .chapter-menu>nav a{white-space:normal;display:block;font-size:14px;min-height:44px;padding:10px 0}
 .detail-pair{grid-template-columns:minmax(200px,.7fr) minmax(0,1fr)}
}
@media(max-width:620px){.detail-pair{grid-template-columns:1fr;gap:24px}.detail-pair>figure{max-width:360px}.practice-flow{display:grid;grid-template-columns:1fr 1fr;gap:22px}.table-scroll th,.table-scroll td{padding:12px 8px}.table-scroll tbody th{width:31%}.flow-figure{padding-block:18px}}
@media print{.feature-navigation,.chapter-menu{display:none}.detail-pair{display:block}.detail-pair>figure{max-width:300px}.table-scroll td,.practice-flow span{color:#222}}