@import url('./stickers.css');
.star-note{--heading-indent:44px;--prose-indent:24px;max-width:1180px;padding-top:26px;padding-bottom:32px}.star-heading .chapter-eyebrow{font-size:12px;letter-spacing:.04em;color:#7b8769;margin:0 0 13px 44px}.star-heading h1{font-size:clamp(28px,3.2vw,38px);line-height:1.4;letter-spacing:-.045em;margin:0 0 16px;font-weight:760}.sticker-heading{position:relative;padding-left:var(--heading-indent);margin-left:0}.sticker-heading:before{content:'';position:absolute;left:0;top:.15em;width:34px;height:34px;background:var(--sticker-sun) center/contain no-repeat}.algae-heading:before{width:28px;height:28px;background-image:var(--sticker-algae)}.oxygen-heading:before{width:24px;height:24px;background-image:var(--sticker-oxygen)}.note-prose{position:relative;margin:0 0 16px var(--heading-indent);padding-left:var(--prose-indent);text-indent:0;font-size:16px;line-height:1.9;color:#53634f;word-break:keep-all;overflow-wrap:anywhere}.note-prose:before{content:'-';position:absolute;left:0;color:#7d896e}.note-footnote{font-size:13px;color:#77826a}.note-footnote:before{content:'※'}.intro-line{margin-bottom:25px}.note-help{display:inline-grid;place-items:center;vertical-align:middle;width:25px;height:25px;padding:0;margin-left:4px;border:1px solid #9eae8c;border-radius:50%;font:650 13px var(--ad-font);color:#597044;background:#eef1e3;cursor:pointer;position:relative;flex-shrink:0}.note-help:after{content:'';position:absolute;inset:-7px}.note-help:hover{background:#dce6cd;border-color:#698651}.first-experiment{margin:0 0 33px var(--heading-indent);border:1px solid #c3ccb6;border-radius:7px;background:#f7f7eb;overflow:hidden;box-shadow:0 4px 0 #e6e5d5}.experiment-bar{display:flex;gap:16px;justify-content:space-between;align-items:center;padding:13px 18px;border-bottom:1px solid #d8dec9;background:#eef1e2}.experiment-bar p{margin:0;font-size:12px;color:#7b866c}.experiment-bar b{font-size:13px;color:#4e6745;margin-right:10px}.zoom-tools{display:flex;align-items:center;gap:5px;flex-shrink:0}.zoom-tools button{display:grid;place-items:center;min-width:32px;height:32px;background:#fffef5;border:1px solid #c5cdb7;border-radius:4px;font-size:18px;color:#4f6847}.zoom-tools #zoom-reset{font-size:11px;padding:0 9px}.zoom-tools output{font-size:11px;width:42px;text-align:center;color:#657853}.zoom-tools button:disabled{opacity:.35;cursor:default}.star-stage{height:310px;position:relative;overflow:hidden;touch-action:pan-y;user-select:none;background:radial-gradient(ellipse at 50% 50%,#fffdf3,transparent 80%)}.star-stage>.solar-illustration{display:block;width:100%;height:100%;cursor:grab;touch-action:pan-y}.star-stage>.solar-illustration:active{cursor:grabbing}.star-stage #vector-seoul,.star-stage #vector-seoul-note,.star-stage #vector-state,.star-stage #vector-season,.star-stage #vector-land-note,.star-stage #vector-north,.star-stage #vector-axis{display:none}.star-stage .scene-scale{position:absolute;bottom:8px;left:12px;right:12px;font-size:10px;color:#8c947f;text-align:center;pointer-events:none}.star-stage #vector-sun,.star-stage #hit-earth{cursor:pointer}.star-stage text{font-family:var(--ad-font)}.star-stage .sun-ray{stroke-dasharray:8 5;animation:star-ray 1.4s linear infinite}.star-stage.illustration-paused .sun-ray{animation-play-state:paused}@keyframes star-ray{to{stroke-dashoffset:-26}}.body-picks{display:flex;justify-content:center;gap:12px;margin-top:-10px;position:relative;z-index:2}.body-picks button{display:flex;align-items:center;gap:8px;min-height:40px;padding:8px 24px;border:1px solid #c6cdb6;border-radius:4px;background:#fffdf4;color:#4f6345;font-size:14px;font-weight:650}.body-picks button[aria-pressed=true]{background:#e8edd8;border-color:#809265;box-shadow:inset 0 -2px #abbf91}.body-picks small{font-size:10px;font-weight:400;color:#8b947b}.body-dot{display:inline-block;width:12px;height:12px;border-radius:50%}.sun-dot{background:#e1b64f}.earth-dot{background:#6c9e98}.observation{text-align:center;margin:12px 18px;font-size:14px;line-height:1.8;color:#647357;min-height:25px}.observation b{color:#426039}.sim-controls{display:grid;grid-template-columns:1fr 1fr;gap:25px;padding:14px 20px 17px;border-top:1px dashed #ccd4bc}.sim-controls>label{font-size:12px;color:#6e7f5b;display:flex;align-items:center;flex-wrap:wrap;gap:5px}.sim-controls output{margin-left:auto;font-size:11px}.sim-controls input[type=range]{width:100%;accent-color:#68864f;height:20px;cursor:pointer}.flow-options{display:flex;justify-content:flex-end;align-items:center;gap:15px;flex-wrap:wrap;font-size:12px;color:#617453}.flow-options label{display:flex;gap:6px;align-items:center}.flow-options input{accent-color:#68864f}.summary-section>h2,.light-section>h2{font-size:23px;line-height:1.5;font-weight:700;letter-spacing:-.035em;margin:0 0 20px}.summary-columns{display:grid;grid-template-columns:1fr;gap:0}.summary-columns h3{font-size:17px;font-weight:650;line-height:1.7;letter-spacing:-.025em;margin:0 0 8px}.summary-columns section{padding:0 0 13px}.summary-columns p{font-size:15px;margin-bottom:10px}.light-section{padding-top:21px;border-top:1px dashed #bbc6ad;margin-top:3px}.light-study{margin:22px 0 18px var(--heading-indent);border:1px solid #c5cdb8;background:#fffdf5;border-radius:5px;overflow:hidden}.light-tabs{display:flex;background:#eff0df;border-bottom:1px solid #d2d8c1}.light-tabs button{flex:1;font:600 13px/1.6 var(--ad-font);padding:12px 8px;border:0;background:none;color:#7b846c;border-bottom:2px solid transparent}.light-tabs button[aria-pressed=true]{background:#fffdf5;color:#3d6043;border-bottom-color:#688650}.light-diagram{display:block;width:100%;height:auto;min-height:140px}.light-diagram text{font:13px var(--ad-font);fill:#6a7a5e}.light-caption{margin:0;padding:13px 20px 18px;font-size:14px;line-height:1.8;color:#6b765e;border-top:1px dashed #d7ddc9}.light-caption b{color:#496343}.one-line-note{margin:29px 0 29px var(--heading-indent);border-left:3px solid #a7b78a;background:#eff1e3;padding:17px 22px;position:relative}.one-line-note>span{font-size:11px;color:#7c8868}.one-line-note p{margin:6px 0 0;font-size:18px;line-height:1.8;font-weight:550;color:#43603e}.next-note{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:25px 0 0 var(--heading-indent);padding-top:25px;border-top:1px solid #bac4ac}.next-note>a{text-decoration:none}.next-question{position:relative;padding-right:42px}.next-question small{display:block;font-size:11px;color:#899274}.next-question strong{font-size:17px;font-weight:600;line-height:1.7}.next-question>span{position:absolute;right:0;top:35%;font-size:25px}.back-index{font-size:12px;white-space:nowrap}.sources-line{display:flex;gap:14px;align-items:center;flex-wrap:wrap;font-size:11px;margin:30px 0 0 var(--heading-indent);color:#8b947c}.sources-line>a{font-size:11px}.source-help{border:0;background:none;color:#617553;padding:5px 0;font-size:11px}.source-help span{display:inline-grid;place-items:center;border:1px solid #aabb92;border-radius:50%;width:18px;height:18px;margin-left:3px}
.explanation-notebook{--heading-indent:32px;--prose-indent:24px;color:#29382f;background:#fffdf5;border:1px solid #bcc5b5;border-radius:8px;width:calc(100% - 36px);max-width:680px;max-height:85dvh;padding:0;box-shadow:0 24px 80px #21382d55;overflow:auto}.explanation-notebook::backdrop{background:#23352d80;backdrop-filter:blur(4px)}.binding-holes{display:flex;justify-content:space-around;height:35px;align-items:center;border-bottom:1px solid #c4b6a4;background:#fffdf5;position:sticky;top:0;z-index:2}.binding-holes i{width:8px;height:8px;border-radius:50%;background:#899184;box-shadow:inset 1px 2px 2px #45513f66}.explanation-top{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:10px 25px;border-bottom:1px solid #c4cbb8;position:sticky;top:35px;background:#fffdf5;z-index:2}.explanation-top>span{font-size:12px;color:#879078}.explanation-top button{display:grid;place-items:center;width:40px;height:40px;font-size:25px;border:1px solid #b4c1a7;border-radius:6px;color:#57704c;background:#fffef7}.explanation-paper{padding:26px 30px 32px;background-image:repeating-linear-gradient(transparent 0,transparent 31px,#97ae7b10 31px,#97ae7b10 32px)}.explanation-kicker{font-size:11px;color:#81906b;margin:0 0 10px 32px}.explanation-paper h2{font-size:25px;line-height:1.6;letter-spacing:-.04em;margin:0 0 22px}.explanation-paper .sun-heading:before{width:26px;height:26px;top:.3em}.explanation-paper h3{font-size:17px;line-height:1.7;margin:22px 0 11px}.explanation-paper .note-prose{font-size:15px;line-height:1.95;margin-bottom:15px}.explanation-paper>a{display:inline-block;font-size:12px;margin:16px 0 0 32px}body:has(.explanation-notebook[open]){overflow:hidden}.model-fraction{padding:15px;background:#edf0df;font-size:14px;margin:16px 0 16px 32px}
@media(max-width:767px){.star-note{--heading-indent:32px;--prose-indent:20px}.star-heading .chapter-eyebrow{margin-left:32px}.sticker-heading:before{width:26px;height:26px}.algae-heading:before,.oxygen-heading:before{width:24px;height:24px}.star-heading h1{font-size:29px}.star-heading .intro-line{font-size:15px}.experiment-bar{padding:11px;flex-wrap:wrap;gap:10px}.experiment-bar p span{font-size:11px}.zoom-tools{margin-left:auto}.star-stage{height:275px}.body-picks button{padding:8px 17px}.sim-controls{grid-template-columns:1fr;gap:9px;padding:14px}.flow-options{justify-content:flex-start;gap:20px}.summary-section>h2,.light-section>h2{font-size:21px}.note-prose{font-size:15px}.note-help{width:25px;height:25px}.next-note{gap:18px;align-items:flex-start;flex-direction:column}.next-question{width:100%}.one-line-note p{font-size:16px}.explanation-paper{padding:23px 20px 25px}.explanation-paper h2{font-size:23px}}
@media(max-width:450px){.star-note{padding-left:31px;padding-right:16px}.first-experiment,.light-study{margin-left:0}.star-stage{height:245px}.experiment-bar p{width:100%}.zoom-tools{margin-left:0;gap:7px}.zoom-tools button{height:36px;min-width:36px}.body-picks button{font-size:13px}.body-picks small{font-size:10px}.observation{font-size:13px;margin:11px 12px;min-height:44px}.summary-columns p{font-size:14px}.star-heading h1{font-size:26px}.note-prose{margin-left:32px;padding-left:18px}.note-footnote{font-size:12px}.one-line-note{margin-left:0}.sources-line{margin-left:0}.explanation-paper .note-prose{margin-left:20px;padding-left:18px;font-size:14px}.light-diagram{min-height:120px}.light-caption{font-size:13px;padding:12px 14px}.scene-scale{font-size:8px!important}.flow-options{font-size:11px;gap:10px}.light-tabs button{font-size:12px}}
@media(prefers-reduced-motion:reduce){.star-stage .sun-ray{animation:none}}
@media print{.star-note{--heading-indent:0px;--prose-indent:0px}.sticker-heading:before,.note-prose:before,.note-help,.zoom-tools,.sources-line button{display:none}.note-prose{margin-left:0;padding-left:0}.first-experiment,.light-study,.one-line-note{margin-left:0}.explanation-notebook{display:none}}

.star-stage #star-infrared{display:none}.star-stage.show-infrared #star-infrared{display:inline}.star-stage.hide-sunlight #vector-rays,.star-stage.hide-sunlight #vector-sun-status{display:none}.star-stage [data-body]{cursor:pointer}.note-modal-open{overflow:hidden}

.note-question-tooltip{position:fixed;inset:auto;z-index:10000;box-sizing:border-box;width:max-content;max-width:min(300px,calc(100vw - 16px));margin:0;padding:10px 13px;border:1px solid #b8c5a8;border-radius:7px;background:#fffdf2;color:#4d6643;box-shadow:0 5px 18px #34482b24;font:500 13px/1.65 var(--ad-font);text-align:left;white-space:normal;word-break:keep-all;overflow-wrap:anywhere;pointer-events:auto}.note-question-tooltip[hidden]{display:none}.note-help:focus-visible,.source-help:focus-visible{outline:2px solid #68834e;outline-offset:4px}@media print{.note-question-tooltip{display:none!important}}

/* Inside a notebook, only the main title carries a sticker. */
.explanation-paper .notebook-subheading{position:relative;margin:18px 0 8px var(--heading-indent);padding-left:var(--prose-indent);font-size:16px;font-weight:600}
.explanation-paper .notebook-subheading::before{content:'-';position:absolute;left:0;color:#7d896e}
.notebook-concept-figure{margin:8px 0 22px var(--heading-indent);padding:10px 0 16px;border-bottom:1px dashed #ccd5be}
.notebook-concept-figure>svg,.notebook-concept-figure>img{display:block;width:100%;height:auto;max-height:290px;object-fit:contain}
.notebook-concept-figure svg{font-family:var(--ad-font);overflow:visible}
.notebook-concept-figure figcaption{margin-top:8px;font:400 14px/1.85 var(--ad-font);color:#5c7152;word-break:keep-all}
.notebook-science-art>a{display:block}
.notebook-science-art>a>img{display:block;width:100%;height:auto;max-height:260px;object-fit:contain}
.notebook-science-art{padding-top:5px;border-bottom:0}
.notebook-graph-detail{margin:12px 0 22px var(--heading-indent);font-size:14px;color:#536b47}
.notebook-graph-detail>summary{cursor:pointer;padding:8px 0}
.notebook-graph-detail .notebook-concept-figure{margin-left:0}
@media(max-width:450px){.notebook-concept-figure{margin-left:0}.explanation-paper .notebook-subheading{margin-left:20px;padding-left:18px}}

/* Sun titles stay on one line; long titles remain reachable on narrow screens. */
.star-heading .sun-heading,.explanation-paper>.sun-heading{white-space:nowrap;overflow-wrap:normal;word-break:normal;max-width:100%;overflow-x:auto;scrollbar-width:thin;scrollbar-color:#bdc7ae transparent}
.star-heading .sun-heading br,.explanation-paper>.sun-heading br{display:none}
.explanation-paper>h2.sun-heading{font-size:22px}
@media(max-width:450px){.star-heading h1.sun-heading{font-size:20px}.explanation-paper>h2.sun-heading{font-size:19px}}