/* zima-design: AHALab illustrated learning handbook.
   Existing brand palette and serif headings retained. Motion: feedback only.
   Photography: generated still-life scenes. Logo: supplied original, not redrawn. */
:root{--paper:#f7f5ef;--paper-solid:#fffefa;--brand-ink:#183c32;--brand-green:#24584c;--brand-dark:#173c33;--brand-quiet:#536457;--brand-line:#d4dcd1;--brand-gold:#936320;--cover-veil:rgba(250,248,241,.96);--cover-fade:rgba(250,248,241,.30);--shadow-quiet:0 12px 38px rgba(31,54,44,.07);--font-display:'Noto Serif SC','SimSun',serif;--font-body:'Microsoft YaHei','PingFang SC',sans-serif;--feedback:150ms ease-out}
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/* Meeting presentation keeps stable controls and a visual chapter header. */
.meeting-logo{width:66px;height:66px;object-fit:contain;mix-blend-mode:multiply}.class-head{gap:14px;justify-content:flex-start;margin-bottom:15px}.class-head p{flex:1;min-width:180px}.class-head label{margin-left:auto}.classroom-page main{max-width:1380px;padding-top:8px}.classroom-page .slide-heading{padding:18px 26px;min-height:180px;background-image:linear-gradient(90deg,var(--cover-veil) 0%,var(--cover-veil) 45%,rgba(250,248,241,.7) 78%,rgba(250,248,241,.12)),var(--chapter-art);background-size:cover;background-position:center 65%;border-bottom:1px solid var(--brand-line)}.classroom-page .slide-heading h2{font-size:clamp(29px,3.1vw,44px);max-width:27em;font-weight:500;margin:8px 0 14px}.classroom-page .slide-heading .lead{font-size:21px;margin-bottom:4px}.classroom-page .slide-heading .eyebrow{font-size:12px;color:var(--brand-gold)}.slide-brand{display:none}.classroom-page .slide-diagram{margin-top:16px}.classroom-page .slide-diagram img{max-height:325px}.classroom-page .presenter{background:var(--paper);gap:8px}.classroom-page .slide .notes{background:var(--paper-solid)}.classroom-page .imprint{display:none}
/* Self-paced edition: every task has enough context to work without a lecturer. */
.study-hero{min-height:460px}.study-hero h1{font-size:clamp(36px,4vw,56px);font-weight:500;line-height:1.35}.study-hero .cover-copy>p:not(.cover-label){font-size:19px;margin-bottom:26px}.study-intro p{max-width:65ch;font-size:17px}.chapter-nav{display:grid;grid-template-columns:1fr;gap:0;margin:26px 0}.chapter-nav a{display:flex;align-items:center;gap:18px;padding:14px 0;border-top:1px solid var(--brand-line);text-decoration:none;font-size:18px}.chapter-nav a span{font-family:Georgia,serif;font-size:24px;color:var(--brand-gold)}.chapter-nav a small{margin-left:auto;font-size:13px;color:var(--brand-quiet)}.study-progress{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px 18px;padding:20px;border:1px solid var(--brand-line);background:var(--paper-solid);margin:30px 0}.study-progress label{grid-column:1/-1;display:flex;justify-content:space-between;font-size:14px}.study-progress progress{width:100%;height:13px;accent-color:var(--brand-green);align-self:center}.study-progress p{grid-column:1/-1;font-size:12px;color:var(--brand-quiet);margin:0}.study-progress button{grid-column:2;grid-row:2;font-size:12px;min-height:36px;padding:4px 10px}.study-chapter{padding-bottom:0}.chapter-cover{min-height:230px;display:flex;align-items:center;padding:30px 28px;background-image:linear-gradient(90deg,var(--cover-veil) 0%,rgba(250,248,241,.92) 40%,rgba(250,248,241,.10)),var(--chapter-art);background-size:cover;background-position:center;margin:34px -20px 18px;border-bottom:1px solid var(--brand-line)}.chapter-cover h2{font-size:36px;line-height:1.4;margin:8px 0 15px;font-weight:500}.chapter-cover p{font-size:15px;max-width:36em;margin:0}.chapter-cover .cover-copy>p:first-child{font-size:12px;color:var(--brand-gold)}.study-step{padding:28px 0 36px;border-bottom:1px solid var(--brand-line);scroll-margin-top:24px}.study-step .step-meta{font-size:12px;color:var(--brand-quiet);margin:0 0 12px}.study-step h3{font-size:27px;margin:0 0 20px;font-weight:500}.study-explanation{font-size:18px;line-height:2;max-width:70ch}.study-step figure{margin:20px 0 26px}.study-step figure img{display:block;width:100%;height:auto}.study-step figcaption{font-size:12px;color:var(--brand-quiet);text-align:right}.study-task{background:var(--paper-solid);border-left:3px solid var(--brand-gold);padding:20px 22px}.study-task strong{font-weight:600;color:var(--brand-ink);font-size:17px}.study-task p{font-size:16px;margin:8px 0 12px}.study-task a{font-size:14px}.self-check{margin:18px 0}.self-check summary{font-size:15px;color:var(--brand-green);cursor:pointer;min-height:40px}.self-check p{font-size:16px;padding:14px 18px;background:var(--paper-solid);margin:0 0 16px}.read-mark{display:flex;gap:10px;align-items:center;font-size:14px;color:var(--brand-quiet);margin:20px 0;cursor:pointer}.read-mark input{width:18px;height:18px;flex-shrink:0;accent-color:var(--brand-green)}.step-next{font-size:14px;display:inline-block;padding:8px 0}.study-ending{margin-top:44px}.study-ending p{max-width:32em}
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@media(prefers-reduced-motion:reduce){button,a,summary{transition:none}html{scroll-behavior:auto}}
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.speaker-head img{width:50px;height:50px;object-fit:contain;mix-blend-mode:multiply}
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