/* Edited features: a clock gallery, a drawing room, and a print workshop. */
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.ff-time{--ff-accent:#28666c;--ff-soft:#e6eeea;--ff-rule:#a8c2be;--ff-highlight:#d8a34c}
.ff-measure{--ff-accent:#406a44;--ff-soft:#e7eddd;--ff-rule:#b3c2a1;--ff-highlight:#c4a24f}
.ff-reading{--ff-accent:#934b37;--ff-soft:#f0e7da;--ff-rule:#cdb6a5;--ff-highlight:#bc7151}
:is(.ff-front,.ff-index,.ff-page,.ff-article-context) :is(h1,h2,h3){font-family:var(--serif);color:var(--ff-ink);overflow-wrap:anywhere}
:is(.ff-front,.ff-index,.ff-page,.ff-article-context) :is(p,li,a,strong,span,output){overflow-wrap:anywhere}
:is(.ff-front,.ff-index,.ff-page,.ff-article-context) :is(a,button,input,select,summary):focus-visible{outline:3px solid #a34d29;outline-offset:4px}
.ff-eyebrow{font:700 12px/1.8 var(--sans);letter-spacing:.1em;color:var(--ff-accent)}
.ff-front{max-width:1280px;margin:56px auto 0;padding:0 30px 55px;border-bottom:1px solid #c6cfb8}
.ff-front-heading{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px 35px;align-items:end;margin-bottom:27px}
.ff-front-heading h2{font-size:36px;line-height:1.6;margin-top:8px}
.ff-front-heading>p{font-size:15px;line-height:1.9;color:#52634e}
.ff-front-heading>a{grid-column:1/-1;justify-self:start;display:inline-flex;align-items:center;gap:18px;min-height:44px;font-size:14px;font-weight:700;text-decoration:underline;text-underline-offset:5px}
.ff-front-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;border:1px solid #bcc7b2}
.ff-feature-card{min-width:0;background:#fffdf5;display:flex;flex-direction:column}
.ff-feature-card+.ff-feature-card{border-left:1px solid #bcc7b2}
.ff-card-art{display:block;text-decoration:none;border-bottom:1px solid var(--ff-rule);background:var(--ff-soft)}
.ff-card-art:hover{text-decoration:none}
.ff-motif{padding:20px 20px 17px;min-width:0;color:var(--ff-accent)}
.ff-motif>svg{display:block;max-width:360px;width:100%;height:auto;margin:0 auto}
.ff-motif>p{text-align:center;font:700 20px/1.8 var(--serif);letter-spacing:.04em;color:var(--ff-accent)}
.ff-motif-time{background:radial-gradient(ellipse at 80% 5%,#f7e9bd66,transparent 70%)}
.ff-motif-measure{background:linear-gradient(#e0e7d799 1px,transparent 1px),linear-gradient(90deg,#e0e7d799 1px,transparent 1px);background-size:24px 24px}
.ff-motif-reading{background:linear-gradient(130deg,#f8ede1,#eee1cf)}
.ff-motif-orbit{fill:none;stroke:#8ca9a5;stroke-width:1.5;stroke-dasharray:4 7}
.ff-motif-face{fill:#fffcf2;stroke:#28666c;stroke-width:2}
.ff-motif-inner{fill:none;stroke:#bdcbc0;stroke-width:1}
.ff-motif-hand{fill:none;stroke:#28666c;stroke-width:5;stroke-linecap:round;stroke-linejoin:round}
.ff-motif-hub{fill:#28666c}.ff-motif-sun{fill:#d8a34c}
.ff-motif-tick{fill:none;stroke:#28666c;stroke-width:2}
.ff-motif-grid{fill:none;stroke:#c0cdb5;stroke-width:1}
.ff-motif-large-paper{fill:#a9bc8770;stroke:#416a43;stroke-width:2}
.ff-motif-small-paper{fill:#fffdf1;stroke:#416a43;stroke-width:2;stroke-dasharray:5 3}
.ff-motif-rule{fill:none;stroke:#456346;stroke-width:1.5}
.ff-motif-print-rule{fill:none;stroke:#b48a74;stroke-width:1}
.ff-motif-type{fill:#8c4d3a;stroke:#733d30;stroke-width:1}
.ff-motif-type-light{fill:#f8eddb;stroke:#b18e76;stroke-dasharray:4 4}
.ff-motif-mark{fill:#fff8e8}
.ff-motif-gap{fill:none;stroke:#9a674c;stroke-width:2}
.ff-card-copy{padding:25px 26px 22px;display:flex;flex-direction:column;flex:1}
.ff-card-copy h2,.ff-card-copy h3{font-size:29px;line-height:1.6;margin:9px 0 13px}
.ff-card-copy h2>a,.ff-card-copy h3>a{display:inline-block;min-height:44px;text-decoration:none}
.ff-card-copy h2>a:hover,.ff-card-copy h3>a:hover{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:6px}
.ff-card-copy>p:not(.ff-eyebrow){font-size:15px;line-height:1.95;color:#4e6054}
.ff-card-foot{margin-top:auto;padding-top:24px;display:flex;flex-wrap:wrap;gap:5px 17px;align-items:center;justify-content:space-between}
.ff-card-foot>span{font-size:12px;color:#5c6c5a}
.ff-card-foot>a{display:inline-flex;align-items:center;gap:13px;min-height:44px;font-size:14px;font-weight:800;color:var(--ff-accent)}
.ff-index{margin-top:30px}
.ff-index-heading{max-width:880px;padding:13px 0 45px}
.ff-index-heading h1{font-size:clamp(35px,4.6vw,57px);line-height:1.55;margin:18px 0 22px;letter-spacing:.04em}
.ff-index-heading>p:last-child{font-size:18px;line-height:2;color:#4c6556}
.ff-index-grid{display:grid;gap:30px}
.ff-index-grid .ff-feature-card{display:grid;grid-template-columns:minmax(260px,.8fr) minmax(0,1.4fr);border:1px solid var(--ff-rule);border-left:6px solid var(--ff-accent)}
.ff-index-grid .ff-card-art{border:0;border-right:1px solid var(--ff-rule)}
.ff-index-grid .ff-card-copy{padding:30px 35px}
.ff-index-grid .ff-card-copy h2{font-size:36px}
.ff-index-grid .ff-card-copy>p:not(.ff-eyebrow){font-size:17px}
.ff-index-note{margin-top:50px;padding-top:30px;border-top:2px solid #93aa86;max-width:880px}
.ff-index-note h2{font-size:28px;margin-bottom:16px}
.ff-index-note>p{font-size:17px;line-height:2}
.ff-index-note nav{display:flex;flex-wrap:wrap;gap:4px 27px;margin-top:17px}
.ff-index-note a{display:inline-flex;align-items:center;min-height:44px;font-weight:700;text-decoration:underline;text-underline-offset:5px}

/* An actual feature page has one title, one hands-on exhibit, and a reading path. */
.ff-page{background:#fffdf7;padding-bottom:15px;margin-top:20px}
.ff-breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:2px 15px;max-width:1320px;margin:auto;padding:10px 35px;font-size:14px;color:#4b6356}
.ff-breadcrumb>a{display:inline-flex;align-items:center;min-height:44px;text-decoration:underline;text-underline-offset:4px}
.ff-feature-hero{max-width:1340px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.85fr);gap:25px;align-items:center;padding:51px 55px;border-block:1px solid var(--ff-rule);border-top:7px solid var(--ff-accent);background:var(--ff-soft)}
.ff-feature-hero>.ff-motif{padding:15px 10px;background:transparent}
.ff-feature-hero>.ff-motif>svg{max-width:400px}
.ff-feature-hero>.ff-motif>p{font-size:25px}
.ff-hero-copy{min-width:0}
.ff-hero-copy h1{font-size:clamp(40px,5vw,68px);line-height:1.5;letter-spacing:.04em;margin:16px 0 18px}
.ff-feature-question{font:700 23px/1.8 var(--serif);color:var(--ff-accent);max-width:28em}
.ff-feature-dek{font-size:17px;line-height:2;margin-top:15px;max-width:36em}
.ff-primary-link{display:inline-flex;align-items:center;justify-content:space-between;gap:34px;border-bottom:2px solid var(--ff-accent);font-size:16px;font-weight:800;min-height:52px;margin-top:26px;color:var(--ff-accent);text-decoration:none}
.ff-primary-link:hover{text-decoration:underline;text-underline-offset:5px}
.ff-feature-body{max-width:1192px;padding:0 32px;margin:0 auto}
.ff-feature-introduction{max-width:48em;font:500 21px/2 var(--serif);margin:42px auto 32px;color:#3f584a}
.ff-chapter-rail{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:0;margin:0 0 50px;border-block:1px solid var(--ff-rule)}
.ff-chapter-rail>a{display:flex;flex-direction:column;justify-content:center;min-width:0;min-height:77px;padding:10px 13px;font-size:13px;font-weight:700;line-height:1.65;border-right:1px solid var(--ff-rule);text-decoration:none}
.ff-chapter-rail>a:first-child{border-left:1px solid var(--ff-rule);background:var(--ff-soft)}
.ff-chapter-rail>a>span{font-size:11px;letter-spacing:.06em;color:var(--ff-accent);margin-bottom:5px}
.ff-chapter-rail>a:hover{background:var(--ff-soft)}
.ff-exhibit{scroll-margin-top:24px;padding:32px;background:#f7f5e9;border:1px solid var(--ff-rule);border-top:5px solid var(--ff-accent);box-shadow:7px 8px 0 #dfdfcb66}
.ff-section-heading{margin-bottom:25px}
.ff-section-heading h2{font-size:clamp(27px,3.1vw,38px);line-height:1.65;margin-top:11px;max-width:27em}
.ff-section-heading>p:last-child:not(.ff-eyebrow){font-size:16px;line-height:1.9;margin-top:13px;color:#4f6557}
.ff-model{min-width:0}
.ff-model-intro{font-size:17px;line-height:1.95;margin-bottom:24px;max-width:50em}
.ff-model-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:30px;align-items:start}
.ff-model-layout>*{min-width:0}
.ff-model figure{margin:0}
.ff-model figcaption{font-size:14px;line-height:1.8;color:#4e6557;margin-top:13px}
.ff-controls{min-width:0;margin:0 0 24px;padding:18px 20px 20px;background:#fffef8;border:1px solid var(--ff-rule);border-bottom:3px solid var(--ff-accent)}
.ff-controls legend{font-size:16px;line-height:1.7;font-weight:800;padding:0 8px;color:var(--ff-accent);max-width:100%}
.ff-controls label{display:block;font-size:16px;line-height:1.8}
.ff-range-label{display:flex!important;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.ff-range-label output{font-weight:800;font-size:20px;font-variant-numeric:tabular-nums}
.ff-controls input[type=range]{display:block;width:100%;height:44px;margin:7px 0 0;accent-color:var(--ff-accent);cursor:pointer;min-width:0}
.ff-control-help{font-size:13px;line-height:1.8;color:#566958;margin-top:3px}
.ff-presets{display:flex;flex-wrap:wrap;gap:9px;margin-top:15px}
.ff-presets>button,.ff-step-buttons>button{border:1px solid var(--ff-accent);border-radius:2px;background:#fffef8;color:var(--ff-accent);font:700 14px/1.65 var(--sans);min-height:44px;padding:9px 12px;text-align:center}
.ff-presets>button[aria-pressed=true]{background:var(--ff-accent);color:#fffdf3}
.ff-presets>button:hover,.ff-step-buttons>button:hover:not(:disabled){box-shadow:inset 0 0 0 1px currentColor}
.ff-model-answer{padding:20px 22px 23px;border-top:4px solid var(--ff-accent);background:var(--ff-soft)}
.ff-model-answer>p:first-child{font-size:14px;font-weight:700;line-height:1.85}
.ff-model-answer>strong{display:block;font:700 clamp(30px,4vw,44px)/1.45 var(--serif);margin:9px 0 3px;color:var(--ff-accent);font-variant-numeric:tabular-nums}
.ff-equation{font-size:16px;line-height:1.85;font-variant-numeric:tabular-nums;margin-top:12px}
.ff-observation-note{font-size:16px;line-height:1.95;margin-top:20px;color:#435b4b}
.ff-model-limit{border-left:3px solid var(--ff-accent);padding:18px 21px;background:#fffdf6;margin-top:26px}
.ff-model-limit h3{font:700 18px/1.8 var(--sans);margin:0 0 10px}
.ff-model-limit>p{font-size:15px;line-height:1.95}
.ff-model-limit>p+p{margin-top:13px}
.ff-model-limit>summary{cursor:pointer;min-height:44px;font-weight:800;font-size:16px;line-height:1.85;padding:8px 0}
.ff-model-limit[open]>summary{margin-bottom:10px}
.ff-model-sources{padding-top:12px;margin-top:22px;border-top:1px solid var(--ff-rule)}
.ff-model-sources>summary{font-weight:700;font-size:15px;line-height:1.8;padding:9px 0;min-height:44px;cursor:pointer}
.ff-model-sources ul{margin:8px 0 0;padding-left:1.3em}
.ff-model-sources li{font-size:14px;line-height:1.85;margin:8px 0 15px}
.ff-model-sources a{display:inline-flex;align-items:center;min-height:44px;font-weight:700;overflow-wrap:anywhere;text-decoration:underline;text-underline-offset:4px;color:var(--ff-accent)}
.ff-model-sources li>p{font-size:14px;color:#4b6252}
.ff-live{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}

/* Time: two clocks share one chosen instant, then diverge by longitude. */
.ff-clock-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.ff-clock-card{min-width:0;padding:19px 12px 20px;text-align:center;background:#fffef9;border:1px solid #aabfba}
.ff-local-clock{background:#e7efeb;border-color:#619292}
.ff-clock-card>p{font-size:14px;line-height:1.8;font-weight:700;min-height:3.6em}
.ff-clock-face{display:block;width:120px;height:auto;margin:10px auto 8px}
.ff-clock-rim{fill:#fffdf2;stroke:#568480;stroke-width:1.5}
.ff-clock-tick{fill:none;stroke:#6b8b80;stroke-width:1.5}
.ff-clock-hour,.ff-clock-minute{fill:none;stroke:#235f64;stroke-linecap:round}
.ff-clock-hour{stroke-width:4}.ff-clock-minute{stroke-width:2.5}
.ff-clock-hub{fill:#235f64}
.ff-clock-card>strong{display:block;font:700 clamp(32px,4vw,47px)/1.45 var(--serif);font-variant-numeric:tabular-nums;letter-spacing:.015em}
.ff-clock-card>span{font-size:13px;line-height:1.7;display:block;margin-top:3px}
.ff-longitude-figure{margin-top:21px!important}
.ff-longitude-figure>svg{width:100%;height:auto;display:block}
.ff-longitude-axis,.ff-longitude-tick{fill:none;stroke:#789c94;stroke-width:2}
.ff-longitude-label{font:700 22px var(--sans);fill:#385e54}
.ff-standard-meridian{fill:none;stroke:#b17b2d;stroke-width:3}
.ff-longitude-marker{fill:#28666c;stroke:#fffdf5;stroke-width:3}
.ff-longitude-pointer{fill:none;stroke:#28666c;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}

/* Paper: one coordinate plane; the original and the enlarged sheet never rescale independently. */
.ff-paper-figure{border:1px solid #c5d0b3;background:#f1f3e5;padding:16px 16px 17px}
.ff-paper-drawing{display:block;width:100%;max-width:355px;height:auto;margin:auto}
.ff-paper-envelope{fill:#fafbf3;stroke:#c0ccaf;stroke-width:2}
.ff-paper-grid{fill:none;stroke:#b5c49f;stroke-width:2;stroke-dasharray:7 5}
.ff-paper-enlarged{fill:#85a16daa;stroke:#406a44;stroke-width:3}
.ff-paper-original{fill:#fffdf055;stroke:#375840;stroke-width:3;stroke-dasharray:7 6}
.ff-paper-ticks{fill:none;stroke:#617947;stroke-width:2}
.ff-paper-figure figcaption{display:flex;flex-wrap:wrap;gap:4px 17px;font-size:13px}
.ff-paper-figure figcaption>span{display:inline-flex;align-items:center;gap:7px}
.ff-paper-key-original::before,.ff-paper-key-enlarged::before{content:'';display:inline-block;width:15px;height:15px;border:1px dashed #375840;flex:0 0 15px}
.ff-paper-key-enlarged::before{background:#85a16d;border-style:solid}
.ff-paper-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}
.ff-paper-results>div{padding:19px 15px 18px;background:#fffef6;border-top:4px solid #a4b28b;min-width:0}
.ff-paper-results>.ff-model-answer{background:#e0eacd;border-color:#406a44}
.ff-paper-results>div>p{font-size:15px;font-weight:700}
.ff-paper-results strong{display:block;font:700 clamp(30px,3.4vw,44px)/1.55 var(--serif);color:#345e38;white-space:nowrap;font-variant-numeric:tabular-nums;margin-top:9px}
.ff-paper-results strong>small{font-size:17px;margin-left:3px}
.ff-paper-dimensions{margin-top:15px;font-size:14px;line-height:1.9}
.ff-paper-dimensions>strong{display:block;font-size:20px;font-variant-numeric:tabular-nums;margin-top:3px}
.ff-static-comparison{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;border-top:1px solid var(--ff-rule);margin-top:27px;padding-top:23px}
.ff-static-comparison>div{padding:0 15px 0 0;border-right:1px solid var(--ff-rule)}
.ff-static-comparison>div:last-child{border-right:0;padding-right:0}
.ff-static-comparison p{font-size:15px;font-weight:700}
.ff-static-comparison strong{display:block;font:700 22px/1.8 var(--serif);color:var(--ff-accent);margin:5px 0}
.ff-static-comparison span{display:block;font-size:14px;font-variant-numeric:tabular-nums}

/* Morse: equal-width units, a hand-operated cursor, and explicit boundary lengths. */
.ff-morse-comparison{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;padding:22px 20px;background:#fffdf6;border:1px solid #d4bfaa}
.ff-morse-comparison figure{min-width:0}
.ff-morse-comparison figcaption{display:flex;align-items:baseline;gap:13px;margin:0 0 7px}
.ff-morse-comparison figcaption>strong{font:700 27px/1.6 var(--sans);color:#6e3b2c;letter-spacing:.08em;white-space:pre}
.ff-morse-comparison figcaption>span{font-size:13px}
.ff-morse-comparison figure>p{font-size:13px;line-height:1.9;margin-top:7px}
.ff-morse-strip{display:block;width:100%;height:auto}
.ff-morse-ruler{fill:none;stroke:#bba18b;stroke-width:1}
.ff-morse-dot,.ff-morse-dash{fill:#8d4936;stroke:none}
.ff-morse-symbol-gap,.ff-morse-letter-gap,.ff-morse-word-gap{fill:#efe4cf;stroke:none}
.ff-morse-boundaries{fill:none;stroke:#b39c80;stroke-width:1;pointer-events:none}
.ff-morse-cursor{display:none;fill:#193e37}
.ff-morse-event[data-active=true]>.ff-morse-cursor{display:block}
.ff-morse-event[data-active=true]>.ff-morse-symbol-gap{fill:#b8d4b6}
.ff-morse-reading-note{font-size:14px;line-height:1.9;color:#654f3f;margin-top:14px}
.ff-morse-controls{margin-top:29px;display:flex;flex-wrap:wrap;gap:17px 22px;align-items:end}
.ff-morse-controls>label{display:flex;align-items:center;gap:13px;flex-wrap:wrap}
.ff-morse-controls select{min-height:46px;max-width:100%;min-width:130px;padding:9px 15px;border:1px solid #9c6a53;background:#fffdf6;border-radius:2px;color:#573d2f;font:700 16px/1.65 var(--sans)}
.ff-step-buttons{display:flex;flex-wrap:wrap;gap:9px}
.ff-step-buttons>button:disabled{color:#746458;border-color:#bfb1a1;background:#ece7de;cursor:default}
.ff-morse-step-note{background:#ede3d3;border-left:4px solid #934b37;padding:18px 21px;margin-top:24px;min-height:107px}
.ff-morse-step-note>p:last-child{font-size:17px;line-height:1.9;margin-top:5px}
.ff-morse-score-heading{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 24px;margin-top:26px;padding-bottom:12px;border-bottom:1px solid #cbb7a0}
.ff-morse-score-heading>p{font-size:15px}
.ff-morse-score-heading>p:first-child>strong{font:700 24px/1.65 var(--sans);letter-spacing:.09em;margin-left:8px;white-space:pre}
.ff-morse-score-heading>p:last-child>strong{font-size:22px;margin-right:3px;font-variant-numeric:tabular-nums}
.ff-morse-score-heading>p>span{font-size:13px;margin-left:10px}
.ff-morse-score{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;padding-top:17px}
.ff-morse-letter{padding:15px;background:#fffdf7;border:1px solid #d0bda7;min-width:0}
.ff-morse-letter-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:38px;margin-bottom:7px}
.ff-morse-letter-heading>strong{font:700 27px/1.4 var(--sans);color:#6e3b2c}
.ff-morse-letter-heading>span{font:700 19px/1.6 var(--sans);letter-spacing:.04em;color:#754e3c;white-space:nowrap}
.ff-morse-letter-units{font-size:13px;line-height:1.75;color:#6c5847;margin-top:7px}
.ff-morse-following,.ff-morse-end{display:flex;align-items:center;justify-content:space-between;gap:5px 10px;border-top:1px solid #d9caba;font-size:12px;line-height:1.75;margin-top:14px;padding:10px 5px 0;min-height:45px}
.ff-morse-following strong{font-size:15px;white-space:nowrap}
.ff-morse-following[data-active=true]{background:#d9e5cd;outline:2px solid #426047;outline-offset:3px}
.ff-morse-end{color:#796453}
.ff-morse-key{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));margin:27px 0 0;padding:0;border-block:1px solid #bfa78e}
.ff-morse-key>div{padding:14px 13px;border-right:1px solid #d1bea9;min-width:0}
.ff-morse-key>div:last-child{border-right:0}
.ff-morse-key dt{font-size:13px;line-height:1.8;min-height:3.6em}
.ff-morse-key dd{font:700 20px/1.7 var(--serif);margin:8px 0 0;color:#8a4936}

/* The reading path uses editorial transitions, not a grid of interchangeable cards. */
.ff-reading-path{margin-top:66px;scroll-margin-top:24px}
.ff-chapters{list-style:none;padding:0;margin:27px 0 0}
.ff-chapters>li{padding:0;margin:0}
.ff-chapter{display:grid;grid-template-columns:68px minmax(0,1fr) 240px;gap:27px;border-top:1px solid var(--ff-rule);padding:31px 0 28px;scroll-margin-top:26px}
.ff-chapter>*{min-width:0}
.ff-chapter-index{border-top:5px solid var(--ff-accent);padding-top:9px}
.ff-chapter-index>span{font-size:9px;letter-spacing:.12em;font-weight:800;color:var(--ff-accent)}
.ff-chapter-index>strong{display:block;font:500 51px/1.4 var(--serif);color:var(--ff-accent)}
.ff-chapter-copy h3{font-size:28px;line-height:1.65;margin:9px 0 16px}
.ff-chapter-copy h3>a{display:inline-block;min-height:44px;text-decoration:none}
.ff-chapter-copy h3>a:hover{text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:1px}
.ff-chapter-copy>p:not(.ff-eyebrow){font-size:17px;line-height:1.95}
.ff-chapter-meta{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 20px;margin-top:18px}
.ff-chapter-meta>span{font-size:13px;color:#5d6b59}
.ff-chapter-meta>a{display:inline-flex;align-items:center;min-height:44px;gap:20px;font-size:15px;font-weight:800;color:var(--ff-accent);text-decoration:underline;text-underline-offset:5px}
.ff-chapter-finding{align-self:start;background:var(--ff-soft);padding:20px 22px;border-top:3px solid var(--ff-accent)}
.ff-chapter-finding>p{font-size:12px;font-weight:700;color:var(--ff-accent);letter-spacing:.06em;margin-bottom:10px}
.ff-chapter-finding>strong{display:block;font:600 17px/1.95 var(--serif)}
.ff-chapter-finding>a{display:inline-flex;align-items:center;min-height:44px;font-size:12px;text-decoration:underline;text-underline-offset:4px;margin-top:12px}
.ff-chapter-bridge{display:flex;align-items:baseline;gap:18px;margin:0 0 25px 95px;padding:13px 0 0;border-top:1px dashed var(--ff-rule);font-size:14px;line-height:1.9;color:#4d6253;max-width:47em}
.ff-chapter-bridge>span{flex:0 0 auto;color:var(--ff-accent);font-size:12px;font-weight:800;border-left:3px solid var(--ff-accent);padding-left:10px}
.ff-takeaway{margin:30px 0 0;padding:35px 42px 38px;background:var(--ff-soft);border-top:5px solid var(--ff-accent);scroll-margin-top:24px}
.ff-takeaway h2{font-size:clamp(26px,3vw,37px);line-height:1.75;margin:14px 0 26px;max-width:28em}
.ff-takeaway ol{counter-reset:ff-question;list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:25px}
.ff-takeaway li{counter-increment:ff-question;min-width:0;font-size:17px;line-height:1.95;border-top:1px solid var(--ff-rule);padding-top:17px}
.ff-takeaway li::before{content:'0' counter(ff-question);display:block;font:600 25px/1.4 var(--serif);color:var(--ff-accent);margin-bottom:10px}
.ff-takeaway>p:last-child{font-size:15px;line-height:1.95;margin-top:26px}
.ff-next-feature{display:grid;grid-template-columns:minmax(0,1fr) 200px;gap:36px;align-items:center;margin-top:42px;padding:28px 0;border-block:1px solid var(--ff-rule)}
.ff-next-feature h2{font-size:30px;line-height:1.6;margin:12px 0 13px}
.ff-next-feature h2>a{display:inline-flex;align-items:center;gap:18px;min-height:44px;text-decoration:none}
.ff-next-feature h2>a:hover{text-decoration:underline;text-underline-offset:5px}
.ff-next-feature>div>p:last-child{font-size:17px;line-height:1.95;max-width:44em}
.ff-next-motif{display:block;background:#f0f0e5;text-decoration:none;border:1px solid #c7cbb5}
.ff-next-motif>.ff-motif{padding:10px}
.ff-next-motif .ff-motif>p{font-size:15px}
.ff-end-nav{display:flex;flex-wrap:wrap;gap:8px 34px;margin:25px 0 42px}
.ff-end-nav>a{display:inline-flex;align-items:center;min-height:44px;font-size:15px;font-weight:700;text-decoration:underline;text-underline-offset:5px}
.ff-article-context{margin:35px 0;padding:24px 26px;background:#eff2e4;border:1px solid #b9c8ab;border-left:5px solid #4d7753}
.ff-article-context h2{font-size:26px;line-height:1.7;margin:8px 0 12px}
.ff-article-context h2>a{display:inline-block;min-height:44px;text-decoration:none}
.ff-article-context h2>a:hover{text-decoration:underline;text-underline-offset:5px}
.ff-article-context section>p:not(.ff-eyebrow){font-size:16px;line-height:1.95}
.ff-article-context nav{display:grid;gap:8px;margin-top:17px}
.ff-article-context nav>a{display:flex;align-items:center;min-height:44px;font-size:15px;line-height:1.8;text-decoration:underline;text-underline-offset:5px;color:#305e41}

@media(max-width:1050px){
  .ff-front-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .ff-card-copy{padding:21px 20px}.ff-card-copy h2,.ff-card-copy h3{font-size:25px}.ff-motif{padding:15px}.ff-motif>p{font-size:17px}
  .ff-feature-hero{padding:38px 37px;gap:18px;grid-template-columns:minmax(0,1.3fr) minmax(0,.8fr)}
  .ff-hero-copy h1{font-size:45px}.ff-feature-question{font-size:21px}.ff-feature-hero>.ff-motif>p{font-size:21px}
  .ff-feature-body{padding-inline:26px}.ff-chapter-rail{grid-template-columns:repeat(4,minmax(0,1fr))}.ff-chapter-rail>a{border-bottom:1px solid var(--ff-rule);min-height:70px}
  .ff-exhibit{padding:26px}.ff-model-layout{gap:23px}.ff-controls{padding:16px}.ff-clock-card>p{font-size:13px}.ff-clock-card>span{font-size:12px}.ff-clock-face{width:105px}
  .ff-presets{gap:7px}.ff-presets>button{font-size:13px;padding-inline:9px}.ff-model-answer{padding:17px}.ff-model-answer>strong{font-size:34px}.ff-paper-results{gap:11px}.ff-paper-results strong{font-size:31px}.ff-paper-results>div{padding:15px 11px}
  .ff-chapter{grid-template-columns:58px minmax(0,1fr) 205px;gap:21px}.ff-chapter-index>strong{font-size:43px}.ff-chapter-copy h3{font-size:25px}.ff-chapter-finding{padding:17px}.ff-chapter-finding>strong{font-size:16px}.ff-chapter-bridge{margin-left:79px}
  .ff-morse-comparison{gap:14px;padding:18px}.ff-morse-comparison figcaption{display:block}.ff-morse-comparison figcaption>span{display:block}.ff-morse-score{gap:13px}.ff-morse-letter{padding:12px}
}
@media(max-width:760px){
  .ff-front{padding-inline:23px;margin-top:39px}.ff-front-heading{display:block}.ff-front-heading h2{font-size:31px}.ff-front-heading>p{margin-top:13px}.ff-front-heading>a{margin-top:7px}
  .ff-front-grid{display:block}.ff-feature-card+.ff-feature-card{border-left:0;border-top:1px solid #bcc7b2}.ff-front-grid .ff-feature-card{display:grid;grid-template-columns:minmax(150px,.7fr) minmax(0,1.2fr)}.ff-front-grid .ff-card-art{border-bottom:0;border-right:1px solid var(--ff-rule);display:flex;align-items:center}.ff-front-grid .ff-card-copy{padding:24px}.ff-front-grid .ff-card-copy h3{font-size:28px}.ff-front-grid .ff-card-copy>p:not(.ff-eyebrow){font-size:15px}.ff-front-grid .ff-card-foot{padding-top:15px}
  .ff-index-heading h1{font-size:36px}.ff-index-heading>p:last-child{font-size:16px}.ff-index-grid .ff-feature-card{grid-template-columns:minmax(170px,.75fr) minmax(0,1.25fr)}.ff-index-grid .ff-card-copy{padding:24px}.ff-index-grid .ff-card-copy h2{font-size:29px}.ff-index-grid .ff-card-copy>p:not(.ff-eyebrow){font-size:16px}
  .ff-breadcrumb{padding-inline:23px;gap:2px 11px;font-size:13px}.ff-feature-hero{padding:30px 26px;grid-template-columns:minmax(0,1fr) 190px}.ff-hero-copy h1{font-size:38px}.ff-feature-question{font-size:19px}.ff-feature-dek{font-size:16px}.ff-feature-hero>.ff-motif{padding:0}.ff-feature-hero>.ff-motif>p{font-size:16px}.ff-primary-link{margin-top:19px}
  .ff-feature-introduction{font-size:19px;margin:29px 0 25px}.ff-feature-body{padding-inline:23px}.ff-chapter-rail{margin-bottom:33px}.ff-chapter-rail>a{font-size:13px;padding:10px}
  .ff-exhibit{padding:22px;box-shadow:4px 5px 0 #dfdfcb66}.ff-section-heading h2{font-size:29px}.ff-model-intro{font-size:16px}.ff-model-layout{grid-template-columns:minmax(0,1fr);gap:24px}.ff-controls{padding:18px}.ff-model-console{min-width:0}.ff-model-answer>strong{font-size:39px}
  .ff-clock-pair{max-width:470px;margin:auto}.ff-clock-card{padding:17px}.ff-clock-card>p{font-size:14px;min-height:3.5em}.ff-clock-face{width:110px}.ff-clock-card>strong{font-size:41px}.ff-clock-card>span{font-size:13px}.ff-longitude-figure{max-width:520px;margin-inline:auto!important}
  .ff-paper-figure{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.65fr);gap:15px;align-items:center}.ff-paper-drawing{width:auto;max-width:100%;height:270px}.ff-paper-figure figcaption{display:block;margin-top:0}.ff-paper-figure figcaption>span{display:flex;margin-top:15px;font-size:14px}.ff-paper-results strong{font-size:43px}
  .ff-reading-path{margin-top:45px}.ff-chapter{grid-template-columns:50px minmax(0,1fr);gap:18px;padding-top:25px}.ff-chapter-index>span{font-size:8px}.ff-chapter-index>strong{font-size:38px}.ff-chapter-copy h3{font-size:26px}.ff-chapter-finding{grid-column:2;display:block;padding:17px 20px}.ff-chapter-finding>strong{font-size:17px}.ff-chapter-finding>a{margin-top:5px}.ff-chapter-bridge{margin-left:68px;display:block}.ff-chapter-bridge>span{display:block;margin-bottom:7px}
  .ff-takeaway{padding:27px 26px}.ff-takeaway h2{font-size:29px}.ff-takeaway ol{grid-template-columns:minmax(0,1fr);gap:14px}.ff-takeaway li{display:flex;align-items:start;gap:18px;padding-top:13px;font-size:17px}.ff-takeaway li::before{flex:0 0 30px;font-size:23px;margin:0}.ff-next-feature{grid-template-columns:minmax(0,1fr) 160px;gap:23px}.ff-next-feature h2{font-size:28px}.ff-next-feature>div>p:last-child{font-size:16px}
  .ff-morse-comparison{gap:20px;grid-template-columns:minmax(0,1fr)}.ff-morse-comparison figure{display:grid;grid-template-columns:100px minmax(0,1fr);gap:0 17px;align-items:center}.ff-morse-comparison .ff-morse-strip{grid-column:2;grid-row:1}.ff-morse-comparison figure>p{grid-column:2;grid-row:2;margin-top:0}.ff-morse-comparison figcaption{grid-row:1/3}.ff-morse-comparison figcaption>strong{font-size:24px}.ff-morse-comparison figcaption>span{font-size:13px}
  .ff-morse-score{grid-template-columns:repeat(2,minmax(0,1fr))}.ff-morse-key{grid-template-columns:repeat(3,minmax(0,1fr))}.ff-morse-key>div{border-bottom:1px solid #d1bea9}.ff-morse-key dt{min-height:3.5em}.ff-morse-controls>label{width:100%;justify-content:space-between}.ff-morse-controls select{flex:1;max-width:220px}.ff-step-buttons{width:100%;gap:8px}.ff-step-buttons>button{flex:1 1 auto;font-size:14px}.ff-morse-step-note{min-height:129px}
}
@media(max-width:520px){
  .ff-front{padding:0 19px 35px}.ff-front-heading h2{font-size:28px}.ff-front-grid .ff-feature-card{display:block}.ff-front-grid .ff-card-art{display:block;border-right:0;border-bottom:1px solid var(--ff-rule)}.ff-front-grid .ff-motif{display:grid;grid-template-columns:125px minmax(0,1fr);align-items:center;gap:15px;padding:9px 20px}.ff-front-grid .ff-motif>p{text-align:left;font-size:21px;line-height:1.8}.ff-front-grid .ff-card-copy{padding:20px 23px}.ff-front-grid .ff-card-copy h3{font-size:27px}.ff-front-grid .ff-card-copy>p:not(.ff-eyebrow){font-size:16px}
  .ff-index-heading{padding-bottom:28px}.ff-index-heading h1{font-size:31px;margin-top:14px}.ff-index-heading h1 br,.ff-index-heading>p br{display:none}.ff-index-grid{gap:24px}.ff-index-grid .ff-feature-card{display:block}.ff-index-grid .ff-card-art{border:0;border-bottom:1px solid var(--ff-rule)}.ff-index-grid .ff-motif{display:grid;grid-template-columns:125px minmax(0,1fr);gap:17px;align-items:center;padding:10px 15px}.ff-index-grid .ff-motif>p{font-size:20px;text-align:left}.ff-index-grid .ff-card-copy{padding:22px}.ff-index-note h2{font-size:25px}.ff-index-note>p{font-size:16px}
  .ff-page{margin-top:10px}.ff-breadcrumb{font-size:12px;padding:6px 18px;gap:0 9px}.ff-feature-hero{display:block;padding:27px 22px 21px}.ff-hero-copy h1{font-size:36px;letter-spacing:.02em;margin:12px 0 17px}.ff-feature-question{font-size:20px;line-height:1.85}.ff-feature-dek{font-size:16px}.ff-primary-link{font-size:15px;min-height:48px}.ff-feature-hero>.ff-motif{display:grid;grid-template-columns:130px minmax(0,1fr);gap:20px;align-items:center;margin-top:20px;border-top:1px solid var(--ff-rule);padding-top:9px}.ff-feature-hero>.ff-motif>p{font-size:21px;text-align:left}
  .ff-feature-body{padding-inline:16px}.ff-feature-introduction{font-size:18px;line-height:1.95;margin:25px 5px}.ff-chapter-rail{grid-template-columns:repeat(2,minmax(0,1fr));border-top:1px solid var(--ff-rule);margin-bottom:28px}.ff-chapter-rail>a{min-height:65px;padding:9px 14px;font-size:14px}.ff-chapter-rail>a:last-child{grid-column:1/-1;flex-direction:row;justify-content:start;gap:13px;align-items:center;min-height:48px}.ff-chapter-rail>a:last-child>span{margin-bottom:0}
  .ff-exhibit{padding:21px 17px 24px}.ff-section-heading{margin-bottom:20px}.ff-section-heading h2{font-size:26px;line-height:1.7}.ff-eyebrow{font-size:11px;letter-spacing:.06em}.ff-model-intro{font-size:16px;line-height:1.95}.ff-model-layout{gap:20px}.ff-controls{padding:16px 14px}.ff-controls legend{font-size:15px}.ff-range-label{font-size:15px!important}.ff-range-label output{font-size:19px}.ff-control-help{font-size:13px}.ff-presets>button{font-size:13px;flex:1 1 auto}.ff-model-answer{padding:17px}.ff-model-answer>strong{font-size:34px}.ff-equation{font-size:15px}.ff-observation-note{font-size:16px}.ff-model-limit{padding:17px 15px}.ff-model-limit>p{font-size:15px}.ff-model-limit h3{font-size:17px}.ff-model-sources>summary{font-size:14px}.ff-model-sources ul{padding-left:1.15em}
  .ff-clock-pair{gap:10px}.ff-clock-card{padding:12px 8px 14px}.ff-clock-card>p{font-size:12px;min-height:3.6em}.ff-clock-face{width:88px}.ff-clock-card>strong{font-size:31px}.ff-clock-card>span{font-size:12px}.ff-longitude-label{font-size:32px}.ff-longitude-label:not(:nth-of-type(3n + 1)){display:none}.ff-model figcaption{font-size:13px}
  .ff-paper-figure{display:block;padding:13px}.ff-paper-drawing{height:220px;max-width:100%;width:auto;margin:auto}.ff-paper-figure figcaption{display:flex;gap:5px 15px;margin-top:12px}.ff-paper-figure figcaption>span{font-size:12px;margin:0}.ff-paper-results{gap:10px}.ff-paper-results strong{font-size:31px}.ff-paper-results>div{padding:15px 11px}.ff-paper-results strong>small{font-size:15px}.ff-paper-dimensions>strong{font-size:19px}.ff-static-comparison{grid-template-columns:minmax(0,1fr);gap:12px}.ff-static-comparison>div{display:grid;grid-template-columns:90px minmax(0,1fr);gap:2px 13px;align-items:baseline;border-right:0;border-bottom:1px solid var(--ff-rule);padding:0 0 12px}.ff-static-comparison>div:last-child{padding-bottom:0;border-bottom:0}.ff-static-comparison strong{font-size:21px;margin:0}.ff-static-comparison span{grid-column:2;font-size:13px}
  .ff-morse-comparison{padding:17px 13px;gap:22px}.ff-morse-comparison figure{grid-template-columns:68px minmax(0,1fr);gap:0 13px}.ff-morse-comparison figcaption>strong{font-size:22px}.ff-morse-comparison figcaption>span{font-size:11px}.ff-morse-comparison figure>p{font-size:12px;line-height:1.85}.ff-morse-reading-note{font-size:14px}.ff-morse-controls{margin-top:25px}.ff-step-buttons>button{font-size:13px;padding-inline:10px}.ff-morse-step-note{padding:16px;min-height:138px}.ff-morse-step-note>p:last-child{font-size:16px}.ff-morse-score-heading{display:block}.ff-morse-score-heading>p+p{margin-top:9px}.ff-morse-score-heading>p>span{display:block;margin:4px 0 0}.ff-morse-score{grid-template-columns:minmax(0,1fr);gap:14px}.ff-morse-letter{padding:15px 17px}.ff-morse-letter-heading>strong{font-size:26px}.ff-morse-following,.ff-morse-end{font-size:13px}.ff-morse-key{grid-template-columns:repeat(2,minmax(0,1fr))}.ff-morse-key>div{padding:13px 10px}.ff-morse-key dt{font-size:13px;min-height:0}.ff-morse-key dd{font-size:19px;margin-top:5px}.ff-morse-key>div:last-child{grid-column:1/-1}
  .ff-reading-path{margin-top:39px}.ff-chapter{grid-template-columns:40px minmax(0,1fr);gap:16px;padding-top:23px}.ff-chapter-index>span{font-size:7px;letter-spacing:0}.ff-chapter-index>strong{font-size:31px}.ff-chapter-copy h3{font-size:24px;line-height:1.7}.ff-chapter-copy>p:not(.ff-eyebrow){font-size:16px}.ff-chapter-meta{display:block}.ff-chapter-meta>a{display:flex;margin-top:8px;justify-content:space-between}.ff-chapter-finding{grid-column:1/-1;margin-left:56px;padding:16px}.ff-chapter-finding>strong{font-size:16px}.ff-chapter-bridge{margin-left:56px;font-size:14px}.ff-takeaway{padding:25px 21px}.ff-takeaway h2{font-size:25px;line-height:1.8}.ff-takeaway li{font-size:16px;gap:13px}.ff-takeaway li::before{font-size:22px}.ff-next-feature{display:block;padding:25px 0}.ff-next-feature h2{font-size:26px}.ff-next-motif{margin-top:20px;max-width:260px}.ff-next-motif>.ff-motif{display:grid;grid-template-columns:100px minmax(0,1fr);gap:12px}.ff-next-motif .ff-motif>p{font-size:16px;text-align:left}.ff-end-nav{gap:2px 25px;margin-bottom:31px}.ff-end-nav>a{font-size:14px}
  .ff-article-context{padding:20px 18px}.ff-article-context h2{font-size:23px}.ff-article-context section>p:not(.ff-eyebrow){font-size:16px}.ff-article-context nav>a{font-size:14px}
}
@media(max-width:360px){
  .ff-front{padding-inline:15px}.ff-front-grid .ff-motif{grid-template-columns:105px minmax(0,1fr);gap:13px;padding-inline:14px}.ff-front-grid .ff-motif>p{font-size:19px}.ff-front-grid .ff-card-copy{padding-inline:19px}
  .ff-feature-hero{padding-inline:18px}.ff-hero-copy h1{font-size:32px}.ff-feature-hero>.ff-motif{grid-template-columns:110px minmax(0,1fr);gap:16px}.ff-feature-hero>.ff-motif>p{font-size:19px}.ff-feature-body{padding-inline:12px}.ff-exhibit{padding-inline:14px}.ff-section-heading h2{font-size:25px}.ff-clock-card>strong{font-size:29px}.ff-clock-face{width:78px}.ff-paper-results strong{font-size:27px}.ff-paper-results>div{padding-inline:9px}.ff-paper-results strong>small{font-size:14px}.ff-paper-results>div>p{font-size:14px}.ff-morse-comparison figure{grid-template-columns:60px minmax(0,1fr);gap:0 10px}.ff-morse-comparison figure>p{font-size:11px}.ff-morse-letter{padding-inline:13px}.ff-chapter{grid-template-columns:34px minmax(0,1fr);gap:13px}.ff-chapter-copy h3{font-size:23px}.ff-chapter-finding,.ff-chapter-bridge{margin-left:0}.ff-chapter-index>strong{font-size:29px}
}
@media(prefers-reduced-motion:reduce){.ff-page *,.ff-front *,.ff-index *,.ff-article-context *{scroll-behavior:auto;animation:none;transition:none}}
@media(forced-colors:active){
  .ff-exhibit,.ff-feature-hero,.ff-card-art,.ff-card-copy,.ff-feature-card,.ff-model-answer,.ff-model-limit,.ff-controls,.ff-clock-card,.ff-paper-figure,.ff-paper-results>div,.ff-morse-comparison,.ff-morse-step-note,.ff-morse-letter,.ff-chapter-finding,.ff-takeaway,.ff-article-context{background:Canvas;color:CanvasText;border-color:CanvasText;box-shadow:none}
  .ff-page :is(h1,h2,h3,p,strong,span,dt,dd,a,output),.ff-front :is(h2,h3,p,strong,span,a),.ff-index :is(h1,h2,p,strong,span,a){color:CanvasText}
  .ff-presets>button,.ff-step-buttons>button,.ff-presets>button[aria-pressed=true],.ff-morse-controls select{background:ButtonFace;color:ButtonText;border-color:ButtonText}
  .ff-clock-rim,.ff-paper-original,.ff-paper-envelope{fill:Canvas;stroke:CanvasText}.ff-clock-hour,.ff-clock-minute,.ff-longitude-axis,.ff-longitude-pointer,.ff-standard-meridian{stroke:CanvasText}.ff-clock-hub,.ff-longitude-marker,.ff-longitude-label,.ff-morse-dot,.ff-morse-dash{fill:CanvasText}.ff-paper-enlarged{fill:Highlight;fill-opacity:.3;stroke:CanvasText}.ff-morse-symbol-gap,.ff-morse-letter-gap,.ff-morse-word-gap{fill:Canvas;stroke:none}.ff-morse-boundaries{stroke:CanvasText}.ff-morse-cursor{fill:Highlight}.ff-morse-following[data-active=true]{outline-color:Highlight;background:Canvas}
  :is(.ff-front,.ff-index,.ff-page,.ff-article-context) :is(a,button,input,select,summary):focus-visible{outline-color:Highlight}
}
@media print{.ff-controls,.ff-primary-link,.ff-chapter-rail{display:none!important}.ff-page,.ff-feature-hero,.ff-exhibit,.ff-model-answer,.ff-takeaway{background:white;color:black;box-shadow:none}.ff-exhibit,.ff-chapter,.ff-takeaway{break-inside:avoid}.ff-feature-body{max-width:none;padding:0}.ff-chapter{grid-template-columns:45px minmax(0,1fr)}.ff-chapter-finding{grid-column:2}.ff-morse-cursor{display:none!important}}
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