/* SMM introductory lesson only. Never alter app chrome or shared lesson tools. */
.sai-intro{--sai-line:var(--mc-line,#e6e7e8);--sai-paper:var(--mc-paper,#fff);--sai-soft:var(--mc-soft,#f4f4f3);--sai-blue:#F2F8FA}
.sai-intro .sai-content{display:grid;gap:16px}
.sai-intro .sai-content>p{margin:0}
.sai-intro .sai-heading h1{margin:12px 0 20px;font-weight:600}
.sai-intro .sai-card{background:var(--sai-paper);border:1px solid var(--sai-line);border-radius:20px;padding:18px;display:grid;gap:14px;min-width:0}
.sai-intro .sai-card h3{margin:0}
.sai-intro .sai-card p{margin:0}
.sai-intro .sai-inner{background:var(--sai-soft);border:0;padding:14px}
.sai-intro .sai-note{background:var(--sai-blue);border-color:#e8eff2}
.sai-intro .sai-photo-wrap{width:100%;aspect-ratio:16/9;border-radius:15px;overflow:hidden;background:var(--sai-soft)}
.sai-intro .sai-photo{display:block;width:100%;height:100%;object-fit:cover}
.sai-intro .sai-photo-unavailable{display:none}
.sai-intro .sai-tabs{display:flex;gap:6px;flex-wrap:wrap}
.sai-intro .sai-tabs button{flex:1 1 auto;min-width:0;border:1px solid var(--sai-line);border-radius:100px;padding:10px 12px;background:transparent;color:inherit;font:inherit;cursor:pointer}
.sai-intro .sai-tabs button.active{background:var(--mc-ink,#222);color:var(--sai-paper);border-color:transparent}
.sai-intro [hidden]{display:none!important}
.sai-intro .sai-option{display:grid;gap:12px}
.sai-intro .sai-details{border:1px solid var(--sai-line);border-radius:16px;padding:14px}
.sai-intro .sai-details summary{cursor:pointer}
.sai-intro .sai-answer{display:flex;align-items:flex-start;gap:12px;text-align:left;width:100%;border:1px solid var(--sai-line);border-radius:14px;background:var(--sai-soft);color:inherit;padding:15px;font:inherit;cursor:pointer}
.sai-intro .sai-answer.selected{border-color:#bcd2dd;background:var(--sai-blue)}
.sai-intro .sai-dot{width:16px;height:16px;border:1px solid currentColor;border-radius:50%;flex:none;margin-top:2px}
.sai-intro .sai-practice-feedback{background:var(--sai-blue);border-radius:14px;padding:16px}
.sai-intro .sai-practice-feedback p{margin:8px 0 0}
.sai-intro .sai-copy-box{background:var(--sai-soft);padding:16px;border-radius:14px;display:grid;gap:12px}
.sai-intro .sai-copy-text{white-space:normal}
.sai-intro .sai-small-btn{justify-self:end;border:1px solid var(--sai-line);border-radius:100px;background:var(--sai-paper);padding:10px 16px;color:inherit;font:inherit}
.sai-intro .sai-links{display:flex;gap:10px;flex-wrap:wrap}
.sai-intro .sai-links a{padding:12px;border:1px solid var(--sai-line);border-radius:14px;color:inherit}
.sai-intro .sai-check{display:flex;gap:12px;align-items:flex-start}
.sai-intro .sai-check input{accent-color:#34383b}
[data-color-mode=night] .sai-intro{--sai-blue:#30383d}
@media(max-width:360px){.sai-intro .sai-card{padding:14px}.sai-intro .sai-tabs button{padding:9px 8px}}



.mc-course.sai-intro:has(.mc-lesson-tools) .mc-navigation{margin-bottom:220px;scroll-margin-bottom:220px}
[data-color-mode=night] .sai-intro .sai-note{border-color:var(--sai-line)}
/* Reconstructed from the approved screen references. Typography remains inherited. */
.mc-course.sai-intro .sai-card{border:0;border-radius:20px;padding:14px;gap:14px;box-shadow:none}
.mc-course.sai-intro .sai-inner{background:var(--sai-soft)}
.mc-course.sai-intro .sai-note{background:var(--sai-blue)}
.mc-course.sai-intro .sai-tabs{gap:8px;align-items:center}
.mc-course.sai-intro .sai-tabs button{flex:0 1 auto;padding:4px 13px;line-height:1.35;min-height:32px}
.mc-course.sai-intro .sai-tabs:has([data-sai-tab^="posts"]),.mc-course.sai-intro .sai-segmented>.sai-tabs,.mc-course.sai-intro .sai-tabs:has([data-sai-tab^="approach"]){display:flex;flex-wrap:nowrap;gap:4px}
.mc-course.sai-intro .sai-tabs:has([data-sai-tab^="posts"]) button,.mc-course.sai-intro .sai-segmented>.sai-tabs button,.mc-course.sai-intro .sai-tabs:has([data-sai-tab^="approach"]) button{flex:1;border:0;padding:4px 6px;background:transparent;color:var(--mc-muted,#777)}
.mc-course.sai-intro .sai-tabs:has([data-sai-tab^="posts"]) button.active,.mc-course.sai-intro .sai-segmented>.sai-tabs button.active,.mc-course.sai-intro .sai-tabs:has([data-sai-tab^="approach"]) button.active{background:var(--sai-soft);color:var(--mc-ink,#222)}
.sai-intro .sai-caption{display:block;text-transform:uppercase;color:var(--mc-muted,#777);font-size:.75em;line-height:1.4;margin-bottom:8px}
.sai-intro .sai-section-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.sai-intro .sai-section-head>span{white-space:nowrap;color:var(--mc-muted,#777)}
.sai-intro .sai-profile{display:flex;gap:12px;align-items:center}
.sai-intro .sai-profile h3{font-weight:500}
.sai-intro .sai-avatar{width:44px;height:44px;flex:none;display:grid;place-items:center;border-radius:50%;background:var(--sai-line)}
.sai-intro .sai-avatar svg{width:22px;height:22px}
.sai-intro .sai-profile p{color:var(--mc-muted,#777)}
.mc-course.sai-intro .sai-disclosure{border:0;padding:0;background:transparent}
.sai-intro .sai-disclosure>summary{list-style:none;display:flex;align-items:center;justify-content:center;gap:12px;border:1px solid var(--sai-line);border-radius:100px;padding:6px 12px;cursor:pointer;color:var(--mc-muted,#666)}
.sai-intro .sai-disclosure>summary::-webkit-details-marker{display:none}
.sai-intro .sai-disclosure[open]>summary span{transform:rotate(180deg)}
.sai-intro .sai-disclosure>div{margin-top:14px;display:grid;gap:12px}
.sai-intro .sai-details>.sai-swap{padding:14px;background:var(--sai-blue);border-radius:14px}
.sai-intro .sai-separated{border-top:1px solid var(--sai-line);padding-top:18px;margin-top:8px}
.sai-intro .sai-client{border-top:0;border-bottom:1px solid var(--sai-line);padding:0 0 18px;margin:0}
.sai-intro .sai-rows{list-style:none;margin:0;padding:0;display:grid}
.sai-intro .sai-rows li{display:flex;align-items:center;gap:14px;padding:18px 0}
.sai-intro .sai-rows li+li{border-top:1px solid var(--sai-line)}
.sai-intro .sai-number{display:grid;place-items:center;min-width:40px;min-height:40px;border-radius:14px;background:var(--sai-soft);color:var(--mc-muted,#666)}
.sai-intro .sai-stage-track{display:flex;gap:4px;height:5px}
.sai-intro .sai-stage-track i{flex:1;border-radius:9px;background:var(--sai-line)}
.sai-intro .sai-stage-track i.filled{background:#c8dde5}
.sai-intro .sai-app-choices{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sai-intro .sai-app-choices button{font:inherit;color:inherit;padding:12px;background:var(--sai-soft);border:1px solid var(--sai-line);border-radius:14px;cursor:pointer}
.sai-intro .sai-app-choices button[aria-pressed=true]{background:var(--sai-blue);border-color:#c8dde5}
.sai-intro .sai-download{display:flex;gap:12px;align-items:center;justify-content:center;border:1px solid var(--sai-line);border-radius:99px;padding:6px 10px;text-decoration:none;color:inherit}
.sai-intro .sai-stage-nav{display:flex;align-items:center;gap:10px}
.sai-intro .sai-stage-next{flex:1;display:flex;gap:20px;align-items:center;justify-content:center;border:0;border-radius:99px;padding:10px;background:var(--mc-ink,#222);color:var(--sai-paper);font:inherit;cursor:pointer}
.sai-intro .sai-stage-nav button:disabled{opacity:.4;cursor:default}
.sai-intro .sai-check{position:relative;align-items:center;gap:12px;cursor:pointer}
.sai-intro .sai-check input{position:absolute;opacity:0;width:22px;height:22px;margin:0}
.sai-intro .sai-check-symbol{flex:none;width:22px;height:22px;border:1px solid var(--sai-line);border-radius:50%;display:grid;place-items:center}
.sai-intro .sai-check-symbol svg{width:17px;height:17px;visibility:hidden}
.sai-intro .sai-check input:checked+.sai-check-symbol{background:var(--mc-ink,#222);border-color:transparent;color:var(--sai-paper)}
.sai-intro .sai-check input:checked+.sai-check-symbol svg{visibility:visible}
.sai-intro .sai-check input:focus-visible+.sai-check-symbol{outline:2px solid currentColor;outline-offset:3px}
.sai-intro .sai-preparation .sai-check{padding:14px 0}
.sai-intro .sai-preparation .sai-check+.sai-check{border-top:1px solid var(--sai-line)}
.sai-intro .sai-counter{background:var(--sai-soft);padding:8px 10px;border-radius:14px}
.sai-intro .sai-completion-track{height:5px;background:var(--sai-line);border-radius:99px;overflow:hidden}
.sai-intro .sai-completion-track i{display:block;width:0;height:100%;background:#bdd6df;transition:width .2s}
.sai-intro .sai-ready{background:var(--sai-soft);border-radius:14px;padding:14px;display:grid;gap:8px}
.sai-intro .sai-recap{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sai-intro .sai-recap>div{padding:14px;border-radius:14px;background:var(--sai-soft)}
.mc-course.sai-intro .sai-navigation{display:flex;flex-direction:row-reverse;align-items:center;gap:10px}
.mc-course.sai-intro .sai-navigation>.mc-primary{flex:1;margin:0}
.mc-course.sai-intro .sai-navigation>.mc-back{margin:0;flex:none}
.mc-course.sai-intro .sai-quiz{display:grid;gap:16px}
.mc-course.sai-intro .sai-quiz .mc-question{border:0;background:transparent;box-shadow:none;padding:0;margin:0;min-width:0}
.mc-course.sai-intro .sai-quiz legend{padding:0;margin-bottom:16px;width:100%}
.mc-course.sai-intro .sai-quiz .mc-options button{display:flex;align-items:flex-start;gap:12px;border:1px solid var(--sai-line);border-radius:14px;background:var(--sai-soft);padding:14px;box-shadow:none}
.mc-course.sai-intro .sai-quiz .mc-options button[aria-pressed=true]{border-color:#c8dde5;background:var(--sai-blue)}
.mc-course.sai-intro .sai-quiz .mc-options button:disabled{opacity:.6}
.mc-course.sai-intro .sai-quiz .mc-options button>svg{width:18px;height:18px;flex:none}
.mc-course.sai-intro .sai-quiz .mc-letter{border:0;background:var(--sai-paper);border-radius:10px;min-width:28px;min-height:36px}
.mc-course.sai-intro .sai-quiz .mc-feedback{margin:16px 0;padding:16px;background:var(--sai-soft);border:0;border-radius:16px}
.mc-course.sai-intro .sai-quiz .sai-stage-nav{margin-top:16px}
.mc-course.sai-intro .sai-quiz .sai-stage-nav>.mc-primary{flex:1;margin:0}
.sai-intro .sai-question-progress{display:flex;gap:4px;height:5px}
.sai-intro .sai-question-progress i{flex:1;background:var(--sai-line);border-radius:9px}
.sai-intro .sai-question-progress i.answered{background:#b9ccc3}
.sai-intro .sai-app-choices button>svg{display:block;width:22px;height:22px;margin:0 auto 10px}
/* Keep the native glass controls, in the lesson footer as in the reference. */
.mc-course.sai-intro .mc-lesson-tools{position:static;inset:auto;display:flex;flex-direction:row;justify-content:flex-start;gap:8px;width:100%;margin:22px 0 0;padding:18px 0 0;border-top:1px solid var(--sai-line);z-index:auto}
.mc-course.sai-intro .mc-lesson-tools .mc-help-widget{width:auto;flex:1;min-width:0;justify-content:center;padding:10px 8px;white-space:normal;line-height:1.35}
.mc-course.sai-intro:has(.mc-lesson-tools) .mc-navigation{margin-bottom:0;scroll-margin-bottom:110px}
.mc-course.sai-intro{padding-bottom:130px}
.mc-course.sai-intro .mc-progress .filled{background:#c8dde5}
.mc-course.sai-intro .mc-primary{background:var(--mc-ink,#202020);background-image:none;color:var(--sai-paper,#fff);border:0;box-shadow:none}
.sai-intro .sai-disclosure[open]>summary .sai-disclosure-label{transform:none}
.sai-intro .sai-disclosure>summary .sai-disclosure-label{flex:initial}
.sai-intro .sai-copy-box textarea{width:100%;box-sizing:border-box;min-height:160px;background:var(--sai-paper);color:inherit;border:1px solid var(--sai-line);border-radius:10px;padding:10px}
.sai-intro button:focus-visible,.sai-intro summary:focus-visible,.sai-intro a:focus-visible{outline:2px solid #809fac;outline-offset:3px}
@media(prefers-reduced-motion:reduce){.sai-intro *{transition:none!important}}

.sai-intro .sai-answer.selected .sai-dot{display:grid;place-items:center;border-color:#94b1bf;color:#7396a6}.sai-intro .sai-answer.selected .sai-dot:after{content:"✓";font-size:12px;line-height:1}.sai-intro .sai-details[open]>summary>[data-sai-analysis-label]{transform:none}

/* Neutral palette exclusively for the new introductory lesson. */
html:has(.sai-intro),body:has(.sai-intro){background:#f7f7f7!important}
.mc-course.sai-intro{--mc-ink:#292929;--mc-copy:#555;--mc-muted:#777;--mc-line:#e1e1e1;--mc-paper:#fff;--mc-soft:#f2f2f2;--mc-accent:#444;--sai-line:#e1e1e1;--sai-paper:#fff;--sai-soft:#f2f2f2;--sai-blue:#f2f8fa}
html[data-color-mode=night]:has(.sai-intro),html[data-color-mode=night] body:has(.sai-intro){background:#232323!important}
html[data-color-mode=night] .mc-course.sai-intro{--mc-ink:#efefef;--mc-copy:#d2d2d2;--mc-muted:#aaa;--mc-line:#484848;--mc-paper:#2b2b2b;--mc-soft:#333;--mc-accent:#ddd;--sai-line:#484848;--sai-paper:#2b2b2b;--sai-soft:#333;--sai-blue:#2c3539}
.mc-course.sai-intro .sai-heading{padding:0 14px;margin-top:32px}
.mc-course.sai-intro .sai-heading h1{margin:0 0 22px}
.mc-course.sai-intro .sai-content>p,.mc-course.sai-intro .sai-content>h3{margin-left:14px;margin-right:14px}
.mc-course.sai-intro .mc-letter{color:var(--mc-ink)}
.mc-course.sai-intro .mc-primary,.mc-course.sai-intro .mc-primary:hover{background:var(--mc-ink);box-shadow:none;border:0}
.mc-course.sai-intro .mc-primary svg{color:inherit}
.mc-course.sai-intro .mc-primary:before,.mc-course.sai-intro .mc-primary:after{display:none}
.mc-course.sai-intro .mc-help-widget{background:var(--sai-paper);border-color:var(--sai-line);box-shadow:0 8px 22px #00000008;color:var(--mc-copy)}
.mc-course.sai-intro .mc-help-widget:before,.mc-course.sai-intro .mc-help-widget:after{display:none}
html body.sg-home-active:has(.sai-intro){background:#f7f7f7!important;color:#292929!important}
html body:has(.sai-intro)::before,html body:has(.sai-intro)::after{background:none!important;box-shadow:none!important}
html[data-color-mode=night] body.sg-home-active:has(.sai-intro){background:#232323!important;color:#efefef!important}
/* Review refinements: disclosure icons and compact navigation. */
.mc-course.sai-intro .sai-disclosure[open]>summary span{transform:none}
.sai-intro .sai-chevron{width:18px;height:18px;flex:none;transition:transform .18s}
.sai-intro .sai-disclosure[open]>summary .sai-chevron{transform:rotate(180deg)}
.mc-course.sai-intro .sai-navigation{justify-content:flex-start;gap:14px;padding-inline:14px}
.mc-course.sai-intro .sai-navigation>.mc-primary{flex:0 1 auto;width:auto;min-width:0;max-width:70%;padding:10px 22px;min-height:44px}
.mc-course.sai-intro .sai-navigation>.mc-back{gap:7px}
.mc-course.sai-intro .sai-stage-nav{justify-content:space-between;gap:16px}
.mc-course.sai-intro .sai-stage-next{flex:0 1 auto;padding:8px 16px;min-height:40px;gap:12px}
.mc-course.sai-intro .mc-lesson-tools{position:fixed;right:max(18px,calc((100vw - 584px)/2));bottom:calc(94px + env(safe-area-inset-bottom));left:auto;top:auto;z-index:90;display:flex;flex-direction:column;align-items:stretch;gap:8px;width:auto;max-width:calc(100vw - 36px);margin:0;padding:0;border:0}
.mc-course.sai-intro .mc-lesson-tools .mc-help-widget{flex:none;justify-content:flex-start;min-height:46px;padding:12px 16px;white-space:nowrap;background:linear-gradient(135deg,#ffffffb0,#ffffff60);border:1px solid #ffffffb0;box-shadow:inset 0 1px 0 #ffffffcc,0 8px 24px -14px #0003;-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px)}
html[data-color-mode=night] .mc-course.sai-intro .mc-lesson-tools .mc-help-widget{background:linear-gradient(135deg,#555555aa,#30303080);border-color:#ffffff38;box-shadow:inset 0 1px 0 #ffffff38,0 8px 24px -14px #0009}
.mc-course.sai-intro:has(.mc-lesson-tools){padding-bottom:260px}
.sai-intro .sai-topics{list-style:none;margin:4px 0;padding:0 0 0 18px;color:var(--mc-copy)}
.sai-intro .sai-topics li{position:relative;padding:0 0 20px 18px;border-left:1px solid #bdd3dc}
.sai-intro .sai-topics li:last-child{padding-bottom:0;border-left-color:transparent}
.sai-intro .sai-topics li:before{content:'';position:absolute;width:7px;height:7px;border-radius:50%;background:#9dbac7;left:-4px;top:7px}
.sai-intro .sai-photo-wrap{position:relative}
.sai-intro .sai-photo-wrap>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center}
.sai-intro .sai-photo-edit{position:absolute;right:9px;bottom:9px;display:flex;align-items:center;gap:6px;background:#fffffff0;color:#292929;border:1px solid #ddd;border-radius:99px;padding:6px 10px;box-shadow:0 2px 10px #0002;font:inherit;cursor:pointer;z-index:2}
.sai-intro .sai-photo-edit svg{width:16px;height:16px}

/* Keep icon-only previous controls optically centered. */
.mc-course.sai-intro .sai-stage-nav>.sai-small-btn{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;min-width:44px;padding:0;line-height:1;flex:none}
.mc-course.sai-intro .sai-stage-nav>.sai-small-btn svg{display:block;width:20px;height:20px;margin:0;flex:none;vertical-align:middle}

/* Disclosure copy occupies the full card width, without the inherited icon column. */
.mc-course.sai-intro .sai-disclosure>div{grid-template-columns:minmax(0,1fr);margin:18px 0 2px;padding:0;width:100%;box-sizing:border-box;text-align:left}
.mc-course.sai-intro .sai-disclosure>div>p{grid-column:1 / -1;justify-self:stretch;width:auto;max-width:none;margin:0;padding:0;text-align:left}

/* Keep compact lesson navigation labels on one line. */
.mc-course.sai-intro .sai-navigation>.mc-primary{white-space:nowrap;flex-shrink:0;max-width:none}