:root{color-scheme:light;--ink:#243b4a;--muted:#61727e;--accent:#08769c;--soft:#eef8fc;--line:#dce5e9;--paper:#fff;--green:#247451;--rust:#a33c2d;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:#fff;color:var(--ink);font-size:15px;line-height:1.75}body[data-subject=ja]{--accent:#936220;--soft:#fcf7eb}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer;touch-action:manipulation}button:disabled{cursor:default;opacity:.65}a{color:var(--accent);text-underline-offset:4px}p,h1,h2,h3,figure,dl,dd{margin:0}button svg,a svg{width:19px;height:19px;flex-shrink:0}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #db9a28;outline-offset:4px}[hidden]{display:none!important}.skip{position:fixed;z-index:100;top:-90px;left:12px;background:var(--ink);color:#fff;padding:10px 18px}.skip:focus{top:8px}
.masthead{border-top:4px solid #08769c;background:#fff}.masthead-inner{max-width:1184px;margin:auto;padding:23px 32px 20px;display:flex;justify-content:space-between;align-items:center;gap:25px}.brand{display:flex;align-items:center;gap:22px;color:#125c80;text-decoration:none;white-space:nowrap}.brand-name{font-size:36px;letter-spacing:-1.2px;line-height:1;font-weight:850}.brand-name b{font-size:24px;letter-spacing:1px;font-weight:750}.brand-description{font-size:13px;color:var(--ink);letter-spacing:.06em;padding-left:22px;border-left:1px solid var(--line)}.header-info{display:flex;align-items:center;gap:16px;font-size:12px;color:var(--muted)}.sample-label{border:1px solid #c4d1d7;padding:2px 10px;border-radius:3px;white-space:nowrap}.subject-navigation{border-block:1px solid var(--line)}.subject-navigation>div{max-width:1120px;margin:auto;display:grid;grid-template-columns:repeat(3,1fr)}.subject-navigation button,.subject-navigation a{display:flex;align-items:center;justify-content:center;gap:16px;border:0;border-right:1px solid var(--line);border-bottom:3px solid transparent;background:white;min-height:66px;text-decoration:none;color:var(--ink);padding:10px 16px}.subject-navigation button:first-child{border-left:1px solid var(--line)}.subject-navigation strong{font-size:17px}.subject-navigation span{font-size:12px}.subject-navigation .nav-english strong{color:#08769c}.subject-navigation .nav-japanese strong{color:#936220}.subject-navigation .nav-math strong{color:#247451}.subject-navigation .nav-english[aria-current]{background:#edf8fc;border-bottom-color:#08769c}.subject-navigation .nav-japanese[aria-current]{background:#fcf7eb;border-bottom-color:#ac792b}.subject-navigation button:hover,.subject-navigation a:hover{background:#f6f8f9}.page{max-width:1184px;margin:auto;padding:0 32px}.page:focus{outline:none}
.page-heading{padding:33px 0 29px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1.1fr;column-gap:48px;align-items:center}.section-label{font-size:12px;font-weight:700;color:var(--accent);margin-bottom:4px}.page-heading h1{font-size:32px;line-height:1.45;letter-spacing:.04em;font-weight:750;grid-column:1}.page-heading>p:last-child{font-size:14px;line-height:1.95;color:#506674;grid-column:2;grid-row:1/3}.news-columns{display:grid;grid-template-columns:minmax(0,1fr) 246px;gap:48px;padding-top:32px}.list-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.list-heading h2{font-size:22px;line-height:1.6;letter-spacing:.04em}.list-count{font-size:12px;color:var(--muted)}.filter-row{display:flex;align-items:center;gap:21px;border-bottom:2px solid #d8e9ef;margin-top:16px}.filter-row>span{font-size:12px;font-weight:600;white-space:nowrap}.region-filter{display:flex;gap:4px}.region-filter button{font-size:13px;min-height:46px;padding:10px 17px;background:none;border:0;border-bottom:3px solid transparent;position:relative;top:2px;color:var(--muted)}.region-filter [aria-pressed=true]{color:var(--accent);border-bottom-color:var(--accent);font-weight:700}.region-filter button:hover{background:var(--soft)}.archive-note{font-size:12px;line-height:1.8;color:var(--muted);margin-top:16px}.story-row{display:grid;grid-template-columns:192px minmax(0,1fr);gap:24px;padding:25px 0;border-bottom:1px solid var(--line)}.story-photo{text-decoration:none;display:block;position:relative;align-self:start;background:#edf1f3;overflow:hidden;border-radius:3px}.story-photo img{width:100%;height:153px;display:block;object-fit:cover}.story-photo.ichiro img{object-position:50% 0%}.story-photo.kids img{object-position:50% 67%}.story-photo>span{display:block;background:#f1f5f7;font-size:10px;color:#5b6d78;text-align:right;padding:3px 7px}.story-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:11px;line-height:1.5;color:var(--muted);margin-bottom:9px}.region-tag{padding:3px 7px;font-size:10px;font-weight:650;border-radius:2px;line-height:1.5;white-space:nowrap}.region-tag.usa{background:#eaf5fb;color:#186c98}.region-tag.japan{background:#f9f0da;color:#825c14}.story-meta time{font-size:11px;white-space:nowrap}.story-row h3{font-weight:650}.story-row h3 a{display:block;text-decoration:none;color:var(--ink)}.story-title{display:block;font-size:20px;line-height:1.45;font-weight:700;letter-spacing:.005em}.story-title[lang=en]{font-family:Arial,"Helvetica Neue",sans-serif}.story-subtitle{display:block;font-size:13px;line-height:1.85;font-weight:500;margin-top:6px}.story-subtitle[lang=en]{font-family:Arial,"Helvetica Neue",sans-serif;font-size:14px}.story-row h3 a:hover .story-title{text-decoration:underline;text-underline-offset:4px;color:var(--accent)}.story-tools{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;color:var(--muted);font-size:11px;margin-top:10px}.story-tools>span+span{border-left:1px solid var(--line);padding-left:12px}.story-tools .read-stamp{color:#247451}.story-actions{display:flex;align-items:center;gap:24px;margin-top:5px}.story-actions a{display:inline-flex;align-items:center;gap:6px;min-height:44px;font-size:12px;text-decoration:none}.story-actions a:hover{text-decoration:underline}.story-actions .read-link{font-weight:700;color:var(--accent)}.story-actions a:last-child{color:var(--muted)}.story-actions svg{width:16px;height:16px}.archive-end{text-align:center;color:var(--muted);font-size:12px;padding:23px 0 18px}.photo-credits{font-size:11px;color:var(--muted);margin-top:2px}.photo-credits summary{cursor:pointer;width:max-content;min-height:44px;padding-block:10px}.photo-credits p{margin-bottom:12px}.photo-credits a{color:inherit}
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.breadcrumb{display:flex;gap:12px;align-items:center;min-height:69px;font-size:12px;color:var(--muted)}.text-button{background:none;border:0;padding:8px 0;min-height:44px;font-size:12px;color:var(--accent);display:inline-flex;align-items:center;gap:7px}.text-button:hover{text-decoration:underline}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 246px;gap:48px;align-items:start}.article-header{padding-bottom:26px}.article-header h1{font-size:30px;line-height:1.45;font-weight:700;margin-top:14px;letter-spacing:.01em}.article-header h1[lang=en]{font-family:Arial,"Helvetica Neue",sans-serif;font-size:32px;line-height:1.3}.article-subtitle{font-size:17px;line-height:1.7;margin-top:13px}.article-subtitle[lang=en]{font-size:18px}.article-date{display:flex;gap:10px 18px;flex-wrap:wrap;font-size:11px;color:var(--muted);margin-top:17px}.subject-tabs{display:flex;border-bottom:2px solid var(--line);gap:4px}.subject-tabs button{padding:12px 28px;min-height:49px;border:0;border-bottom:3px solid transparent;position:relative;top:2px;background:none;font-size:14px;color:var(--muted)}.subject-tabs [aria-pressed=true]{border-bottom-color:var(--accent);background:var(--soft);font-weight:700;color:var(--accent)}.article-reading{padding-top:27px;scroll-margin-top:24px}.reading-controls{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:19px}.reading-controls h2{font-size:19px;white-space:nowrap}.level-picker{display:flex;align-items:center;gap:10px}.level-picker label{font-size:12px;white-space:nowrap;color:var(--muted)}.level-picker select{min-height:44px;border:1px solid #bacbd3;border-radius:4px;padding:7px 27px 7px 10px;background:#fff;font-size:12px;max-width:100%}.reading-goal{font-size:12px;color:var(--muted)}.audio-toolbar{display:flex;align-items:center;gap:15px;background:#f4f7f8;border:1px solid #e4ecef;border-radius:4px;padding:10px 14px}.listen-button{display:flex;align-items:center;justify-content:center;gap:8px;padding:9px 15px;min-height:44px;border:1px solid #b6cbd4;border-radius:4px;background:#fff;color:var(--accent);font-size:12px;font-weight:650;white-space:nowrap}.listen-button[aria-pressed=true]{background:var(--accent);color:white;border-color:var(--accent)}.speech-status{font-size:11px;line-height:1.8;color:var(--muted)}.reading-toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:58px;padding:9px 0;color:var(--muted);font-size:11px}.translation-toggle{display:flex;align-items:center;gap:8px;min-height:44px;cursor:pointer;font-size:12px;color:var(--ink)}.translation-toggle input{accent-color:var(--accent);width:17px;height:17px;margin:0}.reading-body.english{font-family:Arial,"Helvetica Neue",sans-serif;font-size:22px;line-height:1.9;color:#213b4b}.sentence+.sentence{margin-top:22px}.sentence .translation{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku 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.source-check{font-size:11px}.article-bottom{margin-top:30px;padding-top:15px;border-top:1px solid var(--line)}.article-side{min-width:0}.article-photo img{display:block;width:100%;height:186px;object-fit:cover;border-radius:3px}.article-photo.ichiro img{object-position:50% 0%}.article-photo.kids img{object-position:50% 65%}.article-photo figcaption{font-size:11px;color:var(--muted);line-height:1.8;margin-top:9px}.article-photo small{display:block;font-size:10px;margin-top:3px}.article-photo a{color:inherit}.article-contents{margin-top:25px;padding-top:21px;border-top:1px solid var(--line)}.article-contents h2{font-size:14px;font-weight:650;margin-bottom:9px}.article-contents button{display:block;width:100%;text-align:left;padding:10px 0;border:0;border-bottom:1px solid #e9eef1;background:none;min-height:44px;color:var(--accent);font-size:12px}.article-contents button::after{content:'↓';float:right;color:#7d949f}.article-contents button:hover{text-decoration:underline}.lesson-note{margin-top:26px;background:#f1f7f9;padding:20px}.lesson-note h2{display:flex;align-items:center;gap:8px;font-size:15px;line-height:1.7;margin-bottom:12px}.lesson-note h2 svg{width:19px;height:19px;color:var(--accent)}.lesson-note>p{font-size:12px;line-height:1.95;color:var(--muted)}.lesson-note .audio-pending{font-size:11px;color:#61727e;border-block:1px solid #d6e3e9;padding:10px 0;margin-top:15px}.teacher-details{font-size:11px;margin-top:4px}.teacher-details summary{cursor:pointer;color:var(--accent);min-height:44px;padding:10px 0}.teacher-details p{color:var(--muted);line-height:1.9;margin:5px 0 12px}.teacher-details .button{font-size:12px;padding-inline:13px;background:#fff}.teacher-details small{display:block;font-size:10px;color:var(--muted);margin-top:10px}
.footer{max-width:1120px;margin:52px auto 0;padding:28px 0 34px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted)}.footer>div{display:flex;align-items:center;gap:14px}.footer-brand{font-size:19px;font-weight:750;color:#125c80;text-decoration:none;letter-spacing:-.2px}.footer>div>span{font-size:11px}.footer>a{font-size:11px;color:#247451;text-decoration:none}.footer a:hover{text-decoration:underline}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:200;width:max-content;max-width:calc(100% - 32px);padding:13px 20px;background:#253e4a;color:#fff;border-radius:5px;font-size:13px;box-shadow:0 3px 15px #0002}dialog{width:min(740px,calc(100% - 32px));max-height:87dvh;border:1px solid var(--line);border-radius:6px;padding:28px;color:var(--ink);background:white;box-shadow:0 15px 65px #0003;overflow:auto}dialog::backdrop{background:#17344188}.dialog-heading{display:flex;justify-content:space-between;align-items:center;gap:15px}.dialog-heading h2{font-size:21px;line-height:1.6}.close-button{min-height:44px;min-width:44px;border:1px solid var(--line);border-radius:4px;background:#fff;font-size:24px}.script-note{font-size:12px;color:var(--muted);line-height:1.9;margin-top:15px}#lesson-script{font-family:inherit;white-space:pre-wrap;overflow-wrap:anywhere;font-size:13px;line-height:2;background:#f5f8fa;padding:20px;margin:20px 0;border:1px solid var(--line)}.dialog-actions{display:flex;align-items:center;flex-wrap:wrap;gap:20px}.dialog-actions a{font-size:12px}
@media(max-width:1000px){.brand-description{font-size:11px}.header-info>span:first-child{display:none}.news-columns,.article-layout{grid-template-columns:minmax(0,1fr) 218px;gap:30px}.story-row{grid-template-columns:148px minmax(0,1fr);gap:20px}.story-photo img{height:140px}.story-title{font-size:18px}.story-meta time{display:block;width:100%}.guide{padding:18px 17px 5px}.footer{margin-inline:32px;flex-wrap:wrap}.article-header h1[lang=en]{font-size:29px}.reading-controls{flex-wrap:wrap}.level-picker{gap:7px}.level-picker select{font-size:11px}.audio-toolbar{align-items:flex-start;flex-direction:column;gap:7px}.word-row{grid-template-columns:125px minmax(0,1fr);gap:17px}.page-heading{column-gap:32px}.page-heading>p:last-child{font-size:12px}.finish-reading{flex-wrap:wrap}}
@media(max-width:760px){.masthead-inner{padding:17px 20px;gap:15px}.brand{display:block}.brand-name{font-size:30px}.brand-name b{font-size:21px}.brand-description{display:block;font-size:10px;line-height:1.5;border:0;padding:0;margin-top:7px;letter-spacing:.02em}.header-info{font-size:10px}.sample-label{padding:2px 8px}.subject-navigation button,.subject-navigation a{flex-direction:column;gap:2px;min-height:66px;padding:10px 4px}.subject-navigation strong{font-size:14px}.subject-navigation span{font-size:10px}.subject-navigation button:first-child{border-left:0}.subject-navigation a{border-right:0}.page{padding:0 20px}.page-heading{display:block;padding:26px 0 25px}.section-label{font-size:11px;margin-bottom:6px}.page-heading h1{font-size:28px;line-height:1.4}.page-heading>p:last-child{font-size:12px;line-height:1.95;margin-top:14px}.news-columns{grid-template-columns:1fr;gap:30px;padding-top:24px}.list-heading h2{font-size:20px}.list-count{font-size:11px}.filter-row{margin-top:11px;gap:14px}.filter-row>span{font-size:11px}.region-filter{gap:0}.region-filter button{font-size:12px;padding:9px 13px}.archive-note{font-size:11px;margin-top:13px}.story-row{grid-template-columns:106px minmax(0,1fr);gap:15px;padding:21px 0}.story-photo img{height:112px}.story-photo>span{font-size:9px;line-height:1.6;padding:3px 4px;text-align:center}.story-photo.ichiro img{object-position:50% 0%}.story-meta{gap:6px;font-size:10px;margin-bottom:8px}.story-meta time{font-size:10px}.region-tag{font-size:9px;padding:2px 6px}.story-title{font-size:17px;line-height:1.4}.story-subtitle{font-size:12px;line-height:1.75;margin-top:7px}.story-subtitle[lang=en]{font-size:13px}.story-tools{gap:4px 9px;font-size:10px;margin-top:9px}.story-tools>span+span{padding-left:9px}.story-actions{gap:19px;margin-top:6px;flex-wrap:wrap}.story-actions a{font-size:11px;min-height:44px}.story-actions svg{width:14px;height:14px}.archive-end{font-size:11px;padding:20px 0 12px}.photo-credits{font-size:10px}.home-sidebar{display:grid;grid-template-columns:1fr;gap:23px;border-top:1px solid var(--line);padding-top:25px}.guide{padding:20px 22px 4px}.guide li{padding-bottom:18px}.guide li p{font-size:12px}.level-guide{margin:0;padding-bottom:21px}.level-guide dl{display:grid;grid-template-columns:1fr 1fr;gap:20px}.level-guide dl>div+div{margin:0}.level-guide dd{font-size:11px}.reading-record{padding:0 0 21px;align-items:center}.reading-record>div{display:flex;align-items:baseline;gap:13px;flex-wrap:wrap}.reading-record strong{font-size:22px}.reading-record p{flex-basis:100%;font-size:10px;margin-top:-8px}.home-sidebar .math-link{margin:0}.math-link strong{font-size:13px}.breadcrumb{min-height:62px;font-size:11px;gap:11px}.breadcrumb .text-button{font-size:11px}.article-layout{grid-template-columns:1fr;gap:30px}.article-header{padding-bottom:22px}.article-header .story-meta{font-size:11px}.article-header .region-tag{font-size:10px;padding:3px 7px}.article-header h1,.article-header h1[lang=en]{font-size:27px;line-height:1.35;margin-top:13px;letter-spacing:0}.article-subtitle{font-size:15px;line-height:1.85;margin-top:12px}.article-subtitle[lang=en]{font-size:16px;line-height:1.5}.article-date{font-size:10px;gap:6px 12px;margin-top:15px}.subject-tabs button{flex:1;font-size:13px;min-height:49px;padding:11px 13px}.article-reading{padding-top:24px}.reading-controls{gap:13px;margin-bottom:16px}.reading-controls h2{font-size:18px}.level-picker{width:100%;gap:10px}.level-picker label{font-size:11px}.level-picker select{flex:1;min-width:0;font-size:11px}.audio-toolbar{padding:11px 13px;gap:7px;flex-direction:row;align-items:center;flex-wrap:wrap}.listen-button{font-size:12px;min-height:44px;padding:8px 13px}.speech-status{font-size:10px}.reading-toolbar{font-size:11px;padding-block:8px}.translation-toggle{font-size:12px}.reading-body.english{font-size:21px;line-height:1.85}.sentence+.sentence{margin-top:23px}.sentence .translation{font-size:13px;line-height:1.95;padding-left:12px;margin-top:9px}.reading-body.japanese{font-size:17px;line-height:2.1;letter-spacing:0}.lesson-section{padding-top:24px;margin-top:29px}.lesson-section h2{font-size:19px;margin-bottom:19px}.word-row{grid-template-columns:100px minmax(0,1fr);gap:15px;padding:15px 12px}.word-row dt{font-size:17px}.word-row dd strong{font-size:12px}.word-row dd p{font-size:11px}.quiz-question legend{font-size:13px}.quiz-option{font-size:13px;padding:12px;min-height:50px}.quiz-feedback{padding:13px}.quiz-feedback p{font-size:12px}.quiz-summary{font-size:15px;gap:10px}.button{font-size:13px;min-height:48px}.reflection-prompt{font-size:13px}.note-label{font-size:11px}.note-caption{font-size:10px}.finish-reading{flex-direction:column;align-items:flex-start;gap:16px;padding-block:22px}.finish-reading .button{width:100%}.sources p{font-size:11px}.sources ul{font-size:11px}.sources .source-check{font-size:10px}.article-bottom{margin-top:22px}.article-side{display:grid;grid-template-columns:1fr;gap:24px}.article-photo{max-width:420px}.article-photo img{height:205px}.article-photo.ichiro img{height:250px;object-position:50% 0%}.article-contents{display:none}.lesson-note{margin:0;padding:23px}.lesson-note h2{font-size:16px}.lesson-note>p{font-size:13px}.teacher-details{font-size:12px}.teacher-details small{font-size:11px}.lesson-note .audio-pending{font-size:12px}.article-side .math-link{margin:0;padding-top:21px}.footer{display:flex;flex-direction:column;align-items:flex-start;margin:35px 20px 0;padding:25px 0 30px;gap:12px}.footer>div{gap:13px}.footer-brand{font-size:20px}.footer p{font-size:10px}.footer>a{font-size:11px;min-height:44px;padding-top:7px}.toast{font-size:12px;bottom:16px}dialog{padding:22px 19px}.dialog-heading h2{font-size:18px}.script-note{font-size:11px}#lesson-script{font-size:12px;padding:15px}.dialog-actions{gap:10px}.dialog-actions a{font-size:11px;min-height:44px;padding-top:8px}}
@media(max-width:359px){.masthead-inner{padding-inline:16px}.page{padding-inline:16px}.subject-navigation strong{font-size:13px}.subject-navigation span{font-size:9px}.page-heading h1{font-size:26px}.page-heading>p:last-child{font-size:11px}.filter-row{gap:9px}.region-filter button{padding-inline:10px}.story-row{grid-template-columns:86px minmax(0,1fr);gap:12px}.story-photo img{height:102px}.story-photo>span{font-size:8px}.story-title{font-size:16px}.story-subtitle{font-size:11px}.story-tools{font-size:9px;gap:4px 6px}.story-tools>span+span{padding-left:6px}.story-actions{gap:14px}.story-actions a{font-size:10px}.article-header h1,.article-header h1[lang=en]{font-size:25px}.reading-body.english{font-size:20px}.word-row{grid-template-columns:88px minmax(0,1fr);gap:12px;padding:13px 10px}.word-row dt{font-size:16px}.level-picker{gap:8px}.level-picker label{font-size:10px}.level-picker select{font-size:10px;padding-right:20px}.note-caption{font-size:9px}.quiz-summary{font-size:14px}.quiz-summary .text-button{font-size:11px}.footer{margin-inline:16px}.footer>div>span{font-size:10px}}
@media(prefers-reduced-motion:no-preference){button,a{transition:background-color .16s,color .16s}}
.about-page{max-width:850px;padding-top:32px}.about-page h1{margin-top:24px;font-size:28px}.about-page .lesson-section p+p{margin-top:16px}.about-page .lesson-section p{line-height:2}.source-check a{white-space:normal}

.analytics-banner{position:fixed;z-index:60;inset:auto 20px 20px;background:#fff;border:1px solid #b9cdd5;border-top:3px solid #087aa2;box-shadow:0 4px 24px #17334022;padding:18px 22px;display:flex;align-items:center;gap:28px;max-width:1040px;margin:auto;color:#263b44;font-size:13px;line-height:1.75}.analytics-banner[hidden]{display:none}.analytics-banner strong{font-size:15px}.analytics-banner p{margin:4px 0 0}.analytics-banner a{color:#086d88;text-decoration:underline;margin-left:8px}.analytics-message:empty{display:none}.analytics-buttons{display:flex;gap:10px;flex-shrink:0}.analytics-buttons button{padding:10px 18px;min-height:44px;border:1px solid #6c8c98;background:#fff;color:#255665;border-radius:3px;font:inherit;font-weight:700;cursor:pointer}.analytics-buttons button:hover{background:#edf7fa}.analytics-buttons button:focus-visible{outline:3px solid #087aa2;outline-offset:3px}.analytics-buttons button:disabled{opacity:.5;cursor:default}.footer [data-analytics-settings]{font-size:12px;margin-top:8px}@media(max-width:640px){.analytics-banner{inset:auto 12px 12px;display:block;padding:14px 16px;max-height:70vh;overflow-y:auto;font-size:12px}.analytics-buttons{margin-top:12px}.analytics-buttons button{flex:1;padding:9px 10px}}