:root{
 --bg:#ffffff;--surface:#ffffff;--surface-2:#f6f8f8;--ink:#17211f;--muted:#65716d;--faint:#909b97;
 --line:#dde3e0;--line-strong:#c9d2ce;--blue:#214f77;--blue-soft:#eef5f9;--blue-night:#94c8eb;
 --green:#517567;--green-soft:#f0f5f2;--amber:#ad7b24;--amber-soft:#fff9eb;--rose:#a8645f;--rose-soft:#fcf3f2;
 --violet:#6e628d;--violet-soft:#f4f1f8;--coral:#ae665f;--coral-soft:#fff2f0;--teal:#3e756c;--teal-soft:#eef6f4;
 --serif:"Noto Serif TC","Noto Serif JP","Yu Mincho","Hiragino Mincho ProN",Georgia,serif;
 --sans:ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC","Noto Sans JP","Hiragino Sans",Arial,sans-serif;
}
html[data-theme="dark"]{
 --bg:#111716;--surface:#171e1c;--surface-2:#1b2321;--ink:#e7eeeb;--muted:#b4c0bb;--faint:#8f9d97;
 --line:#303b38;--line-strong:#46534f;--blue:#94c8eb;--blue-soft:#1b303c;--green:#8bbca8;--green-soft:#1b2a24;
 --amber:#dcc175;--amber-soft:#2c2719;--rose:#dba09a;--rose-soft:#30201f;--violet:#b7abd7;--violet-soft:#272331;
 --coral:#dfa29c;--coral-soft:#30201e;--teal:#8bc8bb;--teal-soft:#192a27;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.82;text-rendering:optimizeLegibility}
a{color:inherit}button{font:inherit}button,a{touch-action:manipulation}ruby{ruby-position:over}rt{font-size:.56em;color:var(--faint);font-weight:400;line-height:1}
.site-skip{position:absolute;left:16px;top:-80px;z-index:1000;background:#111;color:#fff;padding:9px 13px}.site-skip:focus{top:10px}
.site-nav{position:sticky;top:0;z-index:80;background:color-mix(in srgb,var(--surface) 96%,transparent);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.site-nav-inner{width:min(1180px,calc(100% - 64px));min-height:64px;margin:auto;display:flex;align-items:center;gap:18px}
.site-brand{display:flex;align-items:center;gap:11px;text-decoration:none;min-width:0}.site-mark{width:38px;height:38px;display:grid;place-items:center;background:linear-gradient(145deg,#2f73a8,#245d8c);border:1px solid #174b74;color:#fff;font:700 21px/1 var(--serif);box-shadow:4px 4px 0 #d9e8f3;flex:none}.site-brand strong{display:block;font:600 16px/1.2 var(--serif)}.site-brand small{display:block;color:var(--faint);font-size:9px;margin-top:3px;white-space:nowrap}
.site-links{margin-left:auto;display:flex;align-items:center;gap:21px;font-size:13px;font-weight:700;white-space:nowrap}.site-links a{--c:#59635f;position:relative;color:#59635f;text-decoration:none;padding:8px 0}.site-links a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--c);transform:scaleX(0);transform-origin:left;transition:.18s}.site-links .jp{--c:#214f77}.site-links .learn{--c:#2f776c}.site-links .travel{--c:#b27b00}.site-links .tools{--c:#343b3a}.site-links a:hover,.site-links a[aria-current="page"]{color:var(--c)}.site-links a:hover::after,.site-links a[aria-current="page"]::after{transform:scaleX(1)}
html[data-theme="dark"] .site-links a{color:#aeb9b5}html[data-theme="dark"] .site-links .jp{--c:#94c8eb}html[data-theme="dark"] .site-mark{box-shadow:4px 4px 0 #243642}
.theme-wrap{position:relative;display:grid;place-items:center;width:42px;height:42px;margin-left:0}.toggle-checkbox{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}.toggle-7-label{width:32px;height:32px;border:1px solid var(--line-strong);display:flex;align-items:center;justify-content:center;position:relative;cursor:pointer;transition:.35s;background:var(--surface)}.toggle-7-label:focus-visible{outline:3px solid color-mix(in srgb,var(--blue) 28%,transparent);outline-offset:3px}.t7-core{width:14px;height:14px;border:1.4px solid var(--ink);border-radius:50%;position:relative;transition:all .45s cubic-bezier(.4,0,.2,1);box-shadow:inset 0 0 0 0 var(--ink)}.t7-rays{position:absolute;width:100%;height:100%;display:flex;align-items:center;justify-content:center;transition:transform .45s,opacity .45s}.t7-ray{position:absolute;width:1px;height:4px;background:var(--ink);transition:.45s}.t7-r1{transform:translateY(-11px)}.t7-r2{transform:translateY(11px)}.t7-r3{transform:translateX(-11px);height:1px;width:4px}.t7-r4{transform:translateX(11px);height:1px;width:4px}.toggle-checkbox:checked+.toggle-7-label .t7-rays{opacity:0;transform:rotate(45deg) scale(.5)}.toggle-checkbox:checked+.toggle-7-label .t7-core{border-color:transparent;transform:rotate(-25deg);box-shadow:inset 5px -3px 0 0 var(--ink)}
.page{width:min(1120px,calc(100% - 56px));margin:auto;padding:48px 0 76px}.article-head{padding:0 0 30px;border-bottom:1px solid var(--line-strong)}.eyebrow{margin:0 0 12px;color:var(--blue);font-size:11px;font-weight:850;letter-spacing:.16em;text-transform:uppercase}.article-head h1{margin:0;font:700 clamp(38px,6vw,64px)/1.14 var(--serif);letter-spacing:-.04em}.meaning{margin:15px 0 0;font:500 clamp(20px,2.5vw,27px)/1.55 var(--serif);color:#34413e}.meta{margin-top:20px;color:var(--faint);font-size:12px;display:flex;gap:9px 18px;flex-wrap:wrap}.lead{max-width:820px;margin:18px 0 0;color:var(--muted)}
html[data-theme="dark"] .meaning{color:#d0dbd6}
.reading-id{display:none;min-width:0}.reading-id strong{display:block;color:var(--blue);font:700 18px/1.25 var(--serif);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.reading-id small{display:block;color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.reading-links{display:none;margin-left:auto;gap:17px;font-size:12px;font-weight:750;white-space:nowrap}.reading-links a{text-decoration:none;color:var(--muted)}.reading-links a.active,.reading-links a:hover{color:var(--blue)}
@media(min-width:901px){.site-nav.reading-mode .site-brand span:last-child,.site-nav.reading-mode .site-links{display:none}.site-nav.reading-mode .reading-id{display:block}.site-nav.reading-mode .reading-links{display:flex}.site-nav.reading-mode .theme-wrap{margin-left:0}}
.mobile-reading-id{display:none;position:sticky;top:56px;z-index:65;background:color-mix(in srgb,var(--surface) 97%,transparent);border-bottom:1px solid var(--line);padding:7px 16px}.mobile-reading-id strong{display:block;color:var(--blue);font:700 17px/1.25 var(--serif)}.mobile-reading-id small{display:block;color:var(--muted);font-size:12px;line-height:1.35;margin-top:1px}
.section{padding:38px 0;border-bottom:1px solid var(--line)}.section-head{display:grid;grid-template-columns:96px minmax(0,1fr);gap:22px;align-items:start;margin-bottom:16px}.section-kicker{color:var(--blue);font-size:11px;font-weight:850;letter-spacing:.08em}.section h2{margin:0;font:700 clamp(27px,3vw,40px)/1.25 var(--serif);letter-spacing:-.025em}.section p{margin:0 0 14px}.core-line{margin:13px 0 0;padding-left:20px;border-left:3px solid var(--blue);font:500 20px/1.8 var(--serif)}.tone-blue{border-top:3px solid #7fa4bc}.tone-green{border-top:3px solid #79a99a}.tone-amber{border-top:3px solid #c9a35e}.tone-violet{border-top:3px solid #9689b0}.tone-rose{border-top:3px solid #bf8984}
.section-panel{padding:25px 27px;background:var(--surface-2);border:1px solid var(--line)}.section-panel.blue{background:color-mix(in srgb,var(--blue-soft) 72%,var(--surface))}.section-panel.green{background:color-mix(in srgb,var(--teal-soft) 74%,var(--surface))}.section-panel.amber{background:color-mix(in srgb,var(--amber-soft) 78%,var(--surface))}.section-panel.violet{background:color-mix(in srgb,var(--violet-soft) 72%,var(--surface))}
.facts{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line)}.fact{padding:17px 19px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.fact small{display:block;color:var(--faint);font-size:10px;font-weight:800;letter-spacing:.08em;margin-bottom:6px}.fact strong{font-size:16px;color:var(--blue)}
.form-list{border-top:1px solid var(--line)}.form-row{display:grid;grid-template-columns:170px 1fr;gap:22px;padding:15px 0;border-bottom:1px solid var(--line)}.form-label{font-size:12px;color:var(--muted);font-weight:800}.form-value{font-family:"Noto Sans JP",var(--sans);font-size:17px}.jp-example{position:relative;padding:20px 50px 20px 0;border-bottom:1px solid var(--line)}.jp-example:last-child{border-bottom:0}.jp-example .tag{font-size:10px;color:var(--blue);font-weight:850;letter-spacing:.08em}.jp-example .jp-text{margin:5px 0 4px;font-family:"Noto Sans JP",var(--sans);font-size:21px;line-height:2}.jp-example .zh{color:var(--muted);font-size:14px}.audio-btn{position:absolute;right:0;top:22px;width:38px;height:38px;border:1px solid var(--line);background:var(--surface);color:var(--blue);cursor:pointer}.audio-btn:hover{background:var(--blue-soft)}.nuance-underline{background:linear-gradient(transparent 68%,#f6dfa1 68%,#f6dfa1 91%,transparent 91%);padding:0 .08em}html[data-theme="dark"] .nuance-underline{background:linear-gradient(transparent 68%,#66582b 68%,#66582b 91%,transparent 91%)}
.compare-stack{border-top:1px solid var(--line)}.compare-item{padding:18px 0;border-bottom:1px solid var(--line)}.compare-item>strong{display:block;color:var(--blue);font-size:12px;margin-bottom:10px}.compare-pair{display:grid;grid-template-columns:1fr 1fr;gap:22px}.compare-pair div{min-width:0}.compare-pair b{display:block;font-family:"Noto Sans JP",var(--sans);color:var(--ink);margin-bottom:5px}.compare-pair p{margin:0;color:var(--muted)}
.related{padding:44px 0 0}.related h2{margin:0 0 6px;font:700 28px/1.3 var(--serif)}.related>p{margin:0 0 18px;color:var(--muted);font-size:13px}.related ul{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}.related li{border-bottom:1px solid var(--line)}.related a{display:flex;justify-content:space-between;gap:18px;padding:15px 0;text-decoration:none}.related a:hover{color:var(--blue)}
.footer{background:#121817;color:#e5ece8}.footer-inner{width:min(1120px,calc(100% - 56px));margin:auto;padding:34px 0 40px;font-size:12px}.footer-links{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:12px}.footer a{color:#d7dfdb;text-decoration:none}.footer-copy{color:#8d9994}html[data-theme="dark"] .footer{background:#0d1211;border-top:1px solid #29322f}
/* vocab */
.vocab-toolbar{display:flex;gap:9px;flex-wrap:wrap;margin-top:24px}.tool-btn{min-height:40px;padding:7px 11px;border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);cursor:pointer}.tool-btn[aria-pressed="true"]{color:var(--blue);background:var(--blue-soft);border-color:color-mix(in srgb,var(--blue) 45%,var(--line))}.vocab-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:30px}.word-card{--tone:var(--green);--soft:var(--green-soft);position:relative;background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--tone);padding:20px;min-width:0}.word-card[data-type="verb"]{--tone:#477eaa;--soft:#eef5fa}.word-card[data-type="adj"]{--tone:#b67b3b;--soft:#fff6e9}.word-card[data-type="adverb"]{--tone:#75649e;--soft:#f5f1fa}.word-card[data-type="mimetic"]{--tone:#b56a62;--soft:#fff1ef}.word-card[data-type="other"]{--tone:#4e6e70;--soft:#eef4f4}html[data-theme="dark"] .word-card[data-type="verb"]{--tone:#8fc0e5;--soft:#192a35}html[data-theme="dark"] .word-card[data-type="adj"]{--tone:#dfb270;--soft:#2c2418}html[data-theme="dark"] .word-card[data-type="adverb"]{--tone:#b9abe0;--soft:#272333}html[data-theme="dark"] .word-card[data-type="mimetic"]{--tone:#e2a098;--soft:#30201f}html[data-theme="dark"] .word-card[data-type="other"]{--tone:#91b9bc;--soft:#1c2929}
.word-top{display:flex;align-items:flex-start;gap:12px}.word-num{color:var(--faint);font-size:11px;font-weight:800;padding-top:8px}.word-head{min-width:0;flex:1}.word-reading{font-family:"Noto Sans JP",var(--sans);font-size:12px;color:var(--faint);min-height:18px}.word-title{margin:0;font-family:"Noto Sans JP",var(--sans);font-size:29px;line-height:1.2}.word-audio{flex:none;width:37px;height:37px;border:1px solid var(--line);background:var(--surface);color:var(--tone);cursor:pointer}.word-meta{margin:8px 0 13px;font-size:11px;color:var(--tone);font-weight:800}.meaning-box{padding:12px 13px;background:var(--soft);margin:0 0 12px}.meaning-box small,.point small,.sentence-box small{display:block;font-size:9px;font-weight:850;letter-spacing:.08em;color:var(--faint);margin-bottom:4px}.meaning-box strong{font-size:17px}.point{padding:0 0 12px;border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}.sentence-box{position:relative;margin-top:13px;padding:12px 42px 12px 13px;background:color-mix(in srgb,var(--soft) 70%,var(--surface));font-family:"Noto Sans JP",var(--sans)}.sentence-box .zh{font-family:var(--sans);font-size:12px;color:var(--muted);margin-top:6px;border-top:1px solid color-mix(in srgb,var(--tone) 18%,var(--line));padding-top:6px}.sentence-audio{position:absolute;right:8px;top:8px;width:30px;height:30px;border:0;background:var(--surface);color:var(--tone);cursor:pointer}.word-card.is-playing{outline:2px solid color-mix(in srgb,var(--tone) 55%,transparent);outline-offset:2px}.word-card.test-mode .word-reading,.word-card.test-mode .meaning-box,.word-card.test-mode .point,.word-card.test-mode .sentence-box .zh{filter:blur(5px);user-select:none}.word-card.test-mode.revealed .word-reading,.word-card.test-mode.revealed .meaning-box,.word-card.test-mode.revealed .point,.word-card.test-mode.revealed .sentence-box .zh{filter:none}.reveal-card{display:none;margin-top:11px;width:100%;border:1px solid var(--line);background:var(--surface);padding:8px;color:var(--tone);cursor:pointer}.word-card.test-mode .reveal-card{display:block}.hide-reading rt,.hide-reading .word-reading{display:none!important}
.mini-controls{position:fixed;right:20px;bottom:20px;z-index:70;display:flex;border:1px solid var(--line-strong);background:color-mix(in srgb,var(--surface) 96%,transparent);box-shadow:0 8px 24px rgba(0,0,0,.08)}.mini-controls button{min-width:44px;height:42px;border:0;border-right:1px solid var(--line);background:transparent;color:var(--ink);cursor:pointer}.mini-controls button:last-child{border-right:0}.mini-controls button.active{background:var(--blue-soft);color:var(--blue)}
.study-focus{max-width:1000px;margin:50px auto 0;padding-top:30px;border-top:1px solid var(--line)}.study-focus h2{margin:0 0 20px;font:700 30px/1.3 var(--serif)}.focus-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line)}.focus-item{padding:20px 22px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.focus-item:last-child{grid-column:1/-1}.focus-num{display:block;color:var(--green);font-size:11px;font-weight:900;margin-bottom:7px}.focus-item h3{margin:0 0 8px;font-size:17px}.focus-item p{margin:0;color:var(--muted);font-size:14px}
/* quiz */
.quiz-page{background:#f5f7f8}html[data-theme="dark"] .quiz-page{background:var(--bg)}.quiz-intro{margin-top:26px;padding:16px 18px;border-left:3px solid var(--blue);background:var(--blue-soft);color:var(--muted)}.quiz{margin-top:24px}.question{position:relative;padding:34px 4px 38px;border-bottom:1px solid var(--line)}.question-number{color:var(--faint);font:600 18px/1 var(--serif);margin-bottom:14px}.question-audio{position:absolute;right:0;top:26px;width:40px;height:40px;border:1px solid var(--line);background:var(--surface);color:var(--blue);cursor:pointer}.question-text{max-width:940px;margin:0 54px 22px 0;font-family:"Noto Sans JP",var(--sans);font-size:22px;line-height:2}.question-underline{color:var(--blue);font-weight:800;border-bottom:2px solid #83a5bb}.options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.option{min-height:54px;border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);display:flex;align-items:center;gap:12px;padding:11px 14px;text-align:left;cursor:pointer}.option:hover{border-color:#88a5b6;background:var(--blue-soft)}.option-num{width:26px;height:26px;display:grid;place-items:center;border:1px solid var(--line-strong);font-size:11px;color:var(--faint);font-weight:800;flex:none}.option.correct{border-color:#71a18e;background:var(--green-soft);color:color-mix(in srgb,var(--green) 75%,var(--ink))}.option.wrong{border-color:#c78f8a;background:var(--rose-soft);color:color-mix(in srgb,var(--rose) 70%,var(--ink))}.answer-summary{display:none;margin-top:14px;padding:11px 13px;background:var(--blue-soft);border:1px solid color-mix(in srgb,var(--blue) 20%,var(--line));font-size:13px}.question.answered .answer-summary{display:flex;align-items:center;gap:13px;flex-wrap:wrap}.answer-summary strong{color:var(--blue)}.show-options{margin-left:auto;border:0;background:transparent;color:var(--blue);cursor:pointer;font-size:12px}.question.answered .options{display:none}.question.answered.showing-options .options{display:grid;margin-top:12px}.answer{display:none;margin-top:16px;border-left:3px solid #77a28f;padding:18px 0 4px 20px}.question.answered .answer{display:block}.answer-block{padding:14px 0;border-bottom:1px solid var(--line)}.answer-block:last-child{border-bottom:0}.answer-label{display:block;color:var(--faint);font-size:10px;font-weight:900;letter-spacing:.09em;margin-bottom:7px}.answer-block p{margin:0;color:var(--muted)}.answer-block.translation p{font:500 17px/1.75 var(--serif);color:var(--ink)}.answer-block.analysis{background:color-mix(in srgb,var(--blue-soft) 52%,transparent);padding-left:13px;padding-right:13px}.answer-block.wrong-analysis{background:color-mix(in srgb,var(--rose-soft) 55%,transparent);padding-left:13px;padding-right:13px}.vocab-answer{background:color-mix(in srgb,var(--amber-soft) 70%,transparent);padding:13px}.vocab-answer strong{font-family:"Noto Sans JP",var(--sans);font-size:20px}.vocab-answer small{display:block;color:var(--muted);margin-top:3px}.quiz-controls{position:fixed;right:18px;bottom:18px;z-index:75;display:flex;align-items:stretch;border:1px solid var(--line-strong);background:color-mix(in srgb,var(--surface) 97%,transparent);box-shadow:0 8px 22px rgba(0,0,0,.08)}.quiz-progress{display:flex;align-items:center;padding:0 14px;border-right:1px solid var(--line);font:600 14px/1 var(--serif);white-space:nowrap}.quiz-controls button{border:0;border-right:1px solid var(--line);background:transparent;color:var(--ink);height:42px;padding:0 14px;cursor:pointer;font-size:12px;font-weight:750}.quiz-controls button:last-child{border-right:0}.quiz-controls button:hover,.quiz-controls button.active{background:var(--blue-soft);color:var(--blue)}.result{display:none;margin:34px 0 0;padding:22px;border-top:3px solid #7fa4bc;background:var(--blue-soft)}.result.show{display:block}.result strong{font:700 34px/1 var(--serif)}
/* reading */
.reading-paper{margin-top:28px;padding:28px 30px;border-top:3px solid #6ea99d;background:var(--surface);border-left:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.reading-paper .jp-article{font-family:"Noto Sans JP",var(--sans);font-size:18px;line-height:2.15}.reading-paper .jp-article p{text-indent:1em}.grammar-highlight{border:0;border-bottom:2px solid #d8bd68;background:transparent;color:inherit;font:inherit;padding:0;cursor:pointer}.grammar-highlight:hover{background:var(--amber-soft)}.translation-toggle{margin:22px 0 0;border:1px solid var(--line-strong);background:var(--surface);padding:9px 12px;cursor:pointer}.article-translation{display:none;margin-top:18px;padding:20px;border-top:1px solid var(--line);background:var(--surface-2);color:var(--muted)}.article-translation.show{display:block}.grammar-pop{position:fixed;right:18px;bottom:74px;z-index:90;width:min(360px,calc(100% - 32px));display:none;padding:15px 16px;background:var(--surface);border:1px solid var(--line-strong);box-shadow:0 10px 28px rgba(0,0,0,.16)}.grammar-pop.show{display:block}.grammar-pop strong{display:block;color:var(--blue);font-family:"Noto Sans JP",var(--sans);margin-bottom:5px}.grammar-pop p{margin:0;color:var(--muted);font-size:13px}.grammar-pop button{position:absolute;right:8px;top:8px;border:0;background:transparent;color:var(--faint);cursor:pointer}
@media(max-width:900px){.site-nav-inner{width:calc(100% - 28px);min-height:56px;gap:10px}.site-mark{width:34px;height:34px;font-size:19px;box-shadow:3px 3px 0 #d9e8f3}.site-brand strong{font-size:14px}.site-brand small{display:none}.site-links{gap:12px;font-size:11px}.theme-wrap{width:38px;height:38px}.toggle-7-label{width:30px;height:30px}.page{width:calc(100% - 32px);padding:34px 0 62px}.article-head{padding-bottom:24px}.article-head h1{font-size:40px}.meaning{font-size:20px}.section{padding:30px 0}.section-head{display:block;margin-bottom:12px}.section-kicker{display:block;margin-bottom:7px}.section h2{font-size:30px}.form-row{grid-template-columns:1fr;gap:5px}.compare-pair{grid-template-columns:1fr;gap:13px}.mobile-reading-id.active{display:block}.vocab-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mini-controls,.quiz-controls{right:0;left:0;bottom:0;margin:auto;width:100%;justify-content:center;border-left:0;border-right:0;border-bottom:0}.quiz-controls{display:grid;grid-template-columns:auto repeat(4,1fr)}.quiz-progress{justify-content:center;padding:0 9px}.quiz-controls button{padding:0 7px}.footer-inner{width:calc(100% - 32px)}.reading-paper{padding:22px 18px}.reading-paper .jp-article{font-size:17px}.question{padding:30px 0 34px}.question-text{font-size:19px;line-height:2;margin-right:46px}.options{grid-template-columns:1fr}.answer{padding-left:14px}.focus-grid{grid-template-columns:1fr}.focus-item:last-child{grid-column:auto}}
@media(max-width:680px){.site-links{gap:10px}.site-links .learn,.site-links .travel,.site-links .tools{display:none}.article-head h1{font-size:36px}.vocab-grid{grid-template-columns:1fr;gap:14px}.word-card{padding:18px}.focus-grid{display:block;border-left:0}.focus-item{border-left:1px solid var(--line)}.mini-controls button{flex:1}.section-panel{padding:20px 17px}.facts{grid-template-columns:1fr}.core-line{font-size:18px}.jp-example .jp-text{font-size:19px}.question-text{font-size:18px}.reading-links{display:none!important}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}



@media(min-width:768px){.options{grid-template-columns:1fr!important;max-width:900px!important}}


/* v3: 題型解析維持由上往下，不使用左右並排。 */
.question .options{grid-template-columns:1fr!important;max-width:900px!important}
.question .answer{max-width:920px}
.question .answer-block{display:block!important;width:100%!important;margin:0!important;padding:14px 0!important;border-left:0!important;border-right:0!important;border-bottom:1px solid var(--line)}



/* =========================================================
   N2 REVIEW v7 — desktop human-reading system
   - Main section titles centered
   - Long content stays left-aligned inside a centered reading axis
   - Short decision modules may center as a whole
   - Related sections stay left-aligned and visually lighter
   ========================================================= */
@media (min-width:901px){
  :root{
    --v7-read:860px;
    --v7-section:940px;
    --v7-hero:1000px;
    --v7-wide:1180px;
  }

  .page{
    width:min(var(--v7-wide),calc(100% - 64px))!important;
    margin-inline:auto!important;
    padding-top:22px!important;
    padding-bottom:44px!important;
  }

  /* ---------- Page hero ---------- */
  .article-head{
    width:min(100%,var(--v7-hero))!important;
    margin-inline:auto!important;
    padding:20px 0 18px!important;
    text-align:center!important;
  }
  .article-head h1{
    margin:6px 0 7px!important;
    font-size:clamp(36px,3vw,48px)!important;
    line-height:1.18!important;
  }
  .article-head .meaning{
    margin:4px auto 7px!important;
    max-width:860px!important;
  }
  .article-head .lead{
    margin:5px auto 8px!important;
    max-width:860px!important;
    line-height:1.62!important;
  }
  .article-head .meta{
    justify-content:center!important;
    margin-top:10px!important;
  }
  .article-head .toolbar,
  .article-head .article-tools{
    justify-content:center!important;
  }
  .quiz-intro{
    max-width:820px!important;
    margin:14px auto 0!important;
    padding:11px 14px!important;
    text-align:left!important;
  }

  /* ---------- Main section title system ---------- */
  .section{
    width:min(100%,var(--v7-section))!important;
    margin-inline:auto!important;
    padding:18px 0 20px!important;
  }
  .section-head{
    display:block!important;
    position:static!important;
    width:100%!important;
    margin:0 auto 10px!important;
    text-align:center!important;
  }
  .section > .section-kicker,
  .section-head .section-kicker{
    position:static!important;
    inset:auto!important;
    display:block!important;
    width:auto!important;
    max-width:none!important;
    margin:0 0 5px!important;
    padding:0!important;
    text-align:center!important;
    line-height:1.4!important;
    font-size:11px!important;
    letter-spacing:.09em!important;
    white-space:normal!important;
  }
  .section > h2,
  .section-head h2{
    display:block!important;
    width:100%!important;
    margin:0 auto 8px!important;
    padding:0!important;
    text-align:center!important;
    font-size:clamp(29px,2.25vw,37px)!important;
    line-height:1.2!important;
  }
  .section-intro{
    max-width:var(--v7-read)!important;
    margin:0 auto 10px!important;
    line-height:1.62!important;
  }

  /* ---------- Content axis ---------- */
  .section-panel,
  .compact-core,
  .form-list,
  .examples,
  .compare-stack,
  .compare-groups,
  .deep-copy,
  .note,
  .same-event,
  .quick-steps{
    width:min(100%,var(--v7-read))!important;
    margin-left:auto!important;
    margin-right:auto!important;
  }

  /* Core should feel like the successful connection rows */
  .section-core .core-lead,
  .section-core .fact-grid{
    width:min(100%,var(--v7-read))!important;
    margin-left:auto!important;
    margin-right:auto!important;
  }
  .section-core .core-lead,
  .compact-core .core-line{
    padding:7px 0 8px!important;
    margin:0 auto 8px!important;
    line-height:1.62!important;
  }
  .fact-grid,
  .compact-facts{
    display:block!important;
    border:0!important;
    background:transparent!important;
  }
  .fact-grid .fact,
  .compact-fact{
    display:grid!important;
    grid-template-columns:150px minmax(0,1fr)!important;
    align-items:center!important;
    gap:24px!important;
    min-height:0!important;
    padding:9px 0 10px!important;
    border:0!important;
    border-bottom:1px solid var(--line)!important;
    background:transparent!important;
  }
  .fact-grid .fact:first-child,
  .compact-fact:first-child{
    border-top:1px solid var(--line)!important;
  }
  .fact-label,
  .compact-fact > span{
    margin:0!important;
    color:var(--faint)!important;
    font-size:11px!important;
    font-weight:800!important;
  }
  .fact-value,
  .compact-fact > strong{
    margin:0!important;
    line-height:1.55!important;
  }

  /* Connection rows are the reference density */
  .form-row{
    min-height:0!important;
    padding:10px 0 11px!important;
    gap:22px!important;
  }
  .form-label{align-self:center!important}
  .form-value{line-height:1.6!important}

  /* ---------- Comparison: no giant cards ---------- */
  #compare .compare-stack,
  #compare .compare-groups{
    width:min(100%,var(--v7-read))!important;
    margin-inline:auto!important;
    padding:0!important;
    background:transparent!important;
    border:0!important;
  }
  #compare .compare-grammar{
    position:relative!important;
    margin:0!important;
    padding:11px 0 12px 14px!important;
    border:0!important;
    border-bottom:1px solid var(--line)!important;
    background:transparent!important;
    box-shadow:none!important;
  }
  #compare .compare-grammar:first-child{border-top:1px solid var(--line)!important}
  #compare .compare-grammar::before{
    content:"";
    position:absolute;
    left:0;
    top:14px;
    bottom:14px;
    width:3px;
    background:#8d9aa0;
  }
  #compare .compare-a::before{background:#b68a58}
  #compare .compare-b::before{background:#5f8fab}
  #compare .compare-c::before{background:#6f927e}
  #compare .compare-grammar h3{
    margin:0 0 5px!important;
    font-size:22px!important;
    line-height:1.35!important;
  }
  #compare .compare-a h3{color:#9a6734!important}
  #compare .compare-b h3{color:#376f8e!important}
  #compare .compare-c h3{color:#587e69!important}
  #compare .compare-detail{
    display:grid!important;
    grid-template-columns:72px minmax(0,1fr)!important;
    column-gap:18px!important;
    align-items:start!important;
    margin:0!important;
    padding:4px 0!important;
    background:transparent!important;
    border:0!important;
  }
  #compare .compare-detail > span{
    grid-column:1!important;
    margin:1px 0 0!important;
    color:var(--faint)!important;
    font-size:11px!important;
    font-weight:850!important;
    line-height:1.45!important;
  }
  #compare .compare-detail > p{
    grid-column:2!important;
    margin:0 0 3px!important;
    line-height:1.58!important;
  }
  #compare .compare-example{
    font-weight:700!important;
  }
  #compare .compare-translation,
  #compare .compare-zh{
    color:var(--muted)!important;
    font-size:14px!important;
  }

  /* ---------- Study / Reading Focus ---------- */
  .study-focus{
    width:min(100%,var(--v7-read))!important;
    margin:20px auto 0!important;
    padding-top:14px!important;
  }
  .study-focus .eyebrow,
  .study-focus > h2{
    text-align:center!important;
  }
  .study-focus > h2{
    margin:4px 0 7px!important;
    font-size:27px!important;
  }
  .focus-grid,.focus-list{
    display:block!important;
    border:0!important;
    background:transparent!important;
  }
  .focus-item{
    padding:9px 0 10px!important;
    border:0!important;
    border-bottom:1px solid var(--line)!important;
    background:transparent!important;
  }

  /* ---------- Keigo short decision module ---------- */
  .keigo-flow{
    width:min(100%,760px)!important;
    margin-inline:auto!important;
  }
  .keigo-step{
    padding:10px 0 11px!important;
    text-align:center!important;
  }
  .keigo-step h3{margin:3px 0 5px!important}
  .keigo-arrow{
    margin:4px 0 7px!important;
    text-align:center!important;
    font-size:25px!important;
    font-weight:800!important;
    color:var(--blue)!important;
  }
  .keigo-step p{margin:3px 0!important}
  .keigo-key{
    margin:8px auto 0!important;
    text-align:center!important;
  }
  /* Long keigo reference rows stay left aligned on centered axis */
  #keigo .form-list{
    width:min(100%,var(--v7-read))!important;
    margin-inline:auto!important;
  }
  #keigo .form-row{
    grid-template-columns:220px minmax(0,1fr)!important;
    gap:28px!important;
  }

  /* ---------- Quiz / practice ---------- */
  .quiz{
    width:100%!important;
  }
  .question{
    width:min(100%,880px)!important;
    margin-inline:auto!important;
    padding:20px 0 25px!important;
    border-bottom:1px solid var(--line)!important;
  }
  .question + .question{padding-top:25px!important}
  .question-top{
    display:grid!important;
    grid-template-columns:46px minmax(0,1fr) 42px!important;
    gap:13px!important;
    align-items:start!important;
    margin:0 0 11px!important;
  }
  .question-top .question-number{
    grid-column:1!important;
    margin:0!important;
    padding-top:6px!important;
    align-self:start!important;
  }
  .question-top .question-text{
    grid-column:2!important;
    margin:0!important;
    max-width:none!important;
    font-size:21px!important;
    line-height:1.85!important;
  }
  .question-top .question-audio,
  .question-top .speak-question,
  .question-top .icon-button{
    grid-column:3!important;
    position:static!important;
    right:auto!important;
    top:auto!important;
    align-self:start!important;
    margin:0!important;
  }
  .options{
    width:min(100%,820px)!important;
    max-width:none!important;
    margin-inline:auto!important;
    gap:7px!important;
  }
  .option,.option-btn,.practice-option{
    min-height:47px!important;
    padding-top:8px!important;
    padding-bottom:8px!important;
  }

  /* Never let an answered question lose its explanation */
  .question .answer[hidden]{display:none!important}
  .question.is-answered .answer,
  .question.answered .answer{
    display:block!important;
    width:min(100%,820px)!important;
    max-width:820px!important;
    margin:11px auto 0!important;
  }
  .question.is-answered{padding-bottom:24px!important}
  .question.answered{padding-bottom:24px!important}
  .question.is-answered .answer-choice-summary,
  .question.answered .answer-summary{
    width:min(100%,820px)!important;
    margin-left:auto!important;
    margin-right:auto!important;
  }
  .question.is-answered .translation,
  .question.is-answered .explain-row,
  .question.is-answered .vocab-line,
  .question.answered .answer-block{
    margin-left:0!important;
    margin-right:0!important;
  }
  .question.is-answered .options.is-collapsed{display:none!important}

  /* ---------- Reading ---------- */
  .reading-paper{
    width:min(100%,880px)!important;
    margin-inline:auto!important;
    padding:16px 19px!important;
  }
  .reading-paper .jp-article{
    font-size:17px!important;
    line-height:1.9!important;
  }

  /* ---------- Related: deliberately smaller and left-aligned ---------- */
  .related,
  .vocab-related{
    width:min(100%,820px)!important;
    margin:18px auto 0!important;
    padding:13px 0 14px!important;
    text-align:left!important;
  }
  .related .eyebrow,
  .vocab-related .eyebrow{
    margin-bottom:4px!important;
    font-size:11px!important;
    text-align:left!important;
  }
  .related h2,
  .vocab-related h2{
    margin:0 0 4px!important;
    font-size:24px!important;
    line-height:1.3!important;
    text-align:left!important;
  }
  .related p,
  .related-intro,
  .vocab-related p{
    margin:0 0 7px!important;
    font-size:13px!important;
    text-align:left!important;
  }
  .related ul,
  .vocab-related ul{
    margin-top:7px!important;
  }
  .related a,
  .vocab-related a{
    min-height:0!important;
    padding:9px 0!important;
    text-align:left!important;
  }
}

/* Mobile keeps comfortable reading; section titles remain stacked and collision-free. */
@media (max-width:900px){
  .section-head{
    display:block!important;
    position:static!important;
    text-align:center!important;
  }
  .section > .section-kicker,
  .section-head .section-kicker{
    position:static!important;
    inset:auto!important;
    width:auto!important;
    margin:0 0 5px!important;
    text-align:center!important;
  }
  .section > h2,
  .section-head h2{
    margin-top:0!important;
    text-align:center!important;
  }
  .question-top{
    display:grid!important;
    grid-template-columns:minmax(0,1fr) 40px!important;
    gap:7px 10px!important;
  }
  .question-top .question-number{grid-column:1!important;grid-row:1!important;margin:0!important}
  .question-top .question-audio,
  .question-top .speak-question,
  .question-top .icon-button{grid-column:2!important;grid-row:1!important;position:static!important}
  .question-top .question-text{grid-column:1 / -1!important;grid-row:2!important;margin:0!important}
  #compare .compare-detail{grid-template-columns:1fr!important;padding:5px 0!important}
  #compare .compare-detail > span,
  #compare .compare-detail > p{grid-column:1!important}
  #compare .compare-detail > span{margin-bottom:2px!important}
}
html[data-theme="dark"] #compare .compare-a h3{color:#d9ad77!important}
html[data-theme="dark"] #compare .compare-b h3{color:#8ec1df!important}
html[data-theme="dark"] #compare .compare-c h3{color:#8fbea2!important}



.n2-voice-setting{
  display:inline-flex;align-items:center;gap:6px;white-space:nowrap;
  color:var(--muted,#6f7d79);font-size:12px
}
.n2-voice-setting label{font-weight:750;color:inherit}
.n2-voice-select{
  max-width:210px;min-width:112px;height:28px;
  border:1px solid var(--line,#d9e0de);border-radius:0;
  background:transparent;color:var(--text,#17211f);
  padding:2px 24px 2px 7px;font:inherit;cursor:pointer
}
.n2-voice-select:focus-visible{
  outline:2px solid color-mix(in srgb,var(--blue,#2f6f9f) 35%,transparent);
  outline-offset:2px
}
html[data-theme="dark"] .n2-voice-select,
body.dark-mode .n2-voice-select{
  background:#121817;color:#e8efed;border-color:#38413f
}
@media(max-width:700px){
  .n2-voice-setting{gap:4px}
  .n2-voice-select{max-width:142px;min-width:96px}
}



/* =========================================================
   N2 v12 BOOK READING SYSTEM
   全頁書本式閱讀：中央版心、合理行長、穩定段距、同軸分隔
   ========================================================= */
@media (min-width: 901px){
  :root{
    --book-reading: 820px;
    --book-medium: 900px;
    --book-section: 940px;
    --book-wide: 1120px;
  }

  /* Page */
  .page{
    width:min(var(--book-wide),calc(100% - 64px))!important;
    margin-inline:auto!important;
    padding-bottom:48px!important;
  }

  /* Hero / title: visually centered, not oversized */
  .article-head{
    width:min(100%,960px)!important;
    margin-inline:auto!important;
    padding-top:24px!important;
    padding-bottom:18px!important;
  }
  .article-head h1{
    line-height:1.17!important;
    margin-top:6px!important;
    margin-bottom:7px!important;
  }
  .article-head .lead,
  .article-head .meaning{
    max-width:820px!important;
    margin-left:auto!important;
    margin-right:auto!important;
    line-height:1.68!important;
  }

  /* Section shell */
  .section{
    width:min(100%,var(--book-section))!important;
    margin-inline:auto!important;
    padding-top:18px!important;
    padding-bottom:20px!important;
  }
  .section-head{
    width:100%!important;
    margin:0 auto 10px!important;
  }
  .section-intro{
    width:min(100%,var(--book-reading))!important;
    margin-left:auto!important;
    margin-right:auto!important;
    line-height:1.68!important;
  }

  /* Long-form content uses a book reading width */
  .reading-paper,
  .reading-body,
  .article-body,
  .long-copy,
  .deep-copy,
  .section-copy,
  .section-panel,
  .study-focus,
  .related,
  .vocab-related{
    max-width:var(--book-reading)!important;
    margin-left:auto!important;
    margin-right:auto!important;
  }

  /* Natural text measure */
  .reading-paper p,
  .reading-body p,
  .article-body p,
  .long-copy p,
  .section-copy p,
  .section-panel p,
  .focus-item p,
  .related p,
  .vocab-related p{
    line-height:1.82!important;
  }

  /* Book-like paragraph rhythm */
  .reading-paper p + p,
  .reading-body p + p,
  .article-body p + p,
  .long-copy p + p{
    margin-top:15px!important;
  }

  /* Ruby: close to base text, prevent awkward character spreading */
  ruby{
    ruby-position:over;
  }
  rt{
    font-size:.52em!important;
    line-height:1!important;
    color:var(--faint,#82908c)!important;
    letter-spacing:.02em!important;
  }
  ruby, ruby *{
    word-break:keep-all!important;
  }

  /* Inline words / grammar must not break in the middle */
  .grammar-name,
  .grammar-pattern,
  .word,
  .jp-term,
  .compare-column-title,
  [data-grammar]{
    word-break:keep-all!important;
    overflow-wrap:normal!important;
  }

  /* Short information rows: same density as FORM */
  .fact-grid .fact,
  .compact-fact,
  .form-row,
  .focus-item{
    min-height:0!important;
  }
  .fact-grid .fact,
  .compact-fact{
    padding-top:9px!important;
    padding-bottom:9px!important;
  }
  .form-row{
    padding-top:10px!important;
    padding-bottom:10px!important;
  }

  /* All left accent-line content keeps safe distance */
  .core-line,
  .quote,
  .note-line,
  .translation,
  .keigo-summary-line{
    padding-left:24px!important;
    box-sizing:border-box!important;
  }

  /* Tables */
  table{
    line-height:1.58!important;
  }
  .compare-table,
  .keigo-compare-table{
    max-width:860px!important;
    margin-left:auto!important;
    margin-right:auto!important;
  }

  /* Study Focus + Related = one book tail */
  .study-focus,
  .related,
  .vocab-related{
    width:min(100%,var(--book-reading))!important;
  }
  .study-focus{
    padding-top:13px!important;
  }
  .study-focus .focus-item{
    padding:10px 0 11px!important;
  }
  .study-focus .focus-item h3,
  .study-focus .focus-item > strong{
    max-width:700px!important;
    margin-bottom:4px!important;
  }
  .study-focus .focus-item p{
    max-width:700px!important;
  }
  .related,
  .vocab-related{
    margin-top:14px!important;
    padding-top:12px!important;
    border-top:1px solid var(--line)!important;
  }
  .related h2,
  .vocab-related h2{
    font-size:23px!important;
    margin-bottom:4px!important;
  }
  .related a,
  .vocab-related a{
    padding-top:8px!important;
    padding-bottom:8px!important;
  }

  /* Reading article */
  .reading-paper{
    width:min(100%,860px)!important;
    padding:16px 20px!important;
  }
  .reading-paper .jp-article,
  .reading-paper .reading-text,
  .reading-paper p{
    font-size:19px!important;
    line-height:1.95!important;
    font-weight:430!important;
  }

  /* Keep semantic groups together */
  .reading-unit,
  .sentence-unit{
    break-inside:avoid;
  }
}

/* Mobile: keep comfortable but not huge */
@media (max-width:900px){
  .core-line,
  .quote,
  .note-line,
  .translation,
  .keigo-summary-line{
    padding-left:16px!important;
  }
  .reading-paper .jp-article,
  .reading-paper .reading-text,
  .reading-paper p{
    line-height:1.9!important;
  }
  rt{font-size:.5em!important}
}

/* N2 33 Review v6 — confirmed desktop reading axis + data-safe layout */
@media(min-width:901px){
  .page{width:min(1180px,calc(100% - 64px))!important;margin-inline:auto!important}
  .article-head{width:min(100%,1000px)!important;margin-inline:auto!important;text-align:center!important}
  .article-head h1{font-size:clamp(38px,3.35vw,50px)!important;line-height:1.16!important;text-wrap:balance}
  .article-head .lead{max-width:860px!important;margin-inline:auto!important}
  .article-head .meta{justify-content:center!important;flex-wrap:nowrap!important}
  .quiz,.result,.related{width:min(100%,900px)!important;margin-inline:auto!important}
  .question{padding:30px 0 38px!important}
  .question + .question{padding-top:38px!important}
  .question-top{
    display:grid!important;
    grid-template-columns:40px minmax(0,1fr) 44px!important;
    gap:12px!important;
    align-items:start!important;
    width:100%!important;
    margin:0!important
  }
  .question-number{margin:0!important;padding-top:5px!important;text-align:center!important;font-size:16px!important;color:#60798a!important}
  .question-text{
    margin:0!important;
    padding:0!important;
    width:auto!important;
    max-width:none!important;
    font-size:clamp(18px,1.45vw,21px)!important;
    line-height:1.9!important
  }
  .question-audio{justify-self:end!important;margin:0!important}
  .options{
    width:auto!important;
    margin:18px 56px 0 52px!important;
    grid-template-columns:repeat(2,minmax(0,1fr))!important;
    gap:10px!important
  }
  .option{min-height:54px!important;padding:10px 14px!important;font-size:16px!important}
  .answer-summary{margin:16px 56px 0 52px!important;font-size:15.5px!important;line-height:1.75!important;background:transparent!important}
  .answer{margin:18px 56px 0 52px!important}
  .answer-block{background:transparent!important;padding:16px 0!important}
  .answer-block + .answer-block{border-top:1px solid #dfe5e2!important}
  .answer-block.translation p{font-size:17px!important;color:#365f4b!important}
  .answer-block.analysis .answer-label{color:#235b7b!important}
  .answer-block.wrong-analysis .answer-label{color:#954d45!important}
  .answer-label{margin-bottom:7px!important}
}
.question-context{margin:0 0 8px;color:var(--muted);font-size:.9em}
.dialogue-row{display:grid;grid-template-columns:max-content minmax(0,1fr);gap:10px;align-items:start;margin:4px 0}
.speaker-label{font-weight:800;white-space:nowrap}.dialogue-line{margin:0}
@media(max-width:900px){.dialogue-row{grid-template-columns:1fr;gap:2px}}

/* N2 33 Review v7 — preserve original pedagogical emphasis */
.question-underline{
  text-decoration-line:underline!important;
  text-decoration-thickness:2px!important;
  text-underline-offset:.18em!important;
  text-decoration-color:currentColor!important;
  font-weight:750!important;
}
.question-blank{
  display:inline-block;
  min-width:4.2em;
  text-align:center;
  border-bottom:2px solid #6e8795;
  line-height:1.25;
  color:transparent;
  user-select:none;
}
.question-text strong,.question-text b{font-weight:800}
.question-text em{font-style:normal;font-weight:750}
.question-text mark{background:transparent;border-bottom:2px solid currentColor}

/* N2 33 Review v8 — preserve original option focus/emphasis */
.question-focus{
  text-decoration-line:underline!important;
  text-decoration-thickness:2px!important;
  text-decoration-color:#7f8f96!important;
  text-underline-offset:.20em!important;
  font-weight:800!important;
  letter-spacing:.08em;
}
.question-strong{font-weight:800!important}
.question-text .question-focus,
.option-text .question-focus{
  color:inherit;
}
.question-blank{
  display:inline-block;
  min-width:4.2em;
  border-bottom:2px solid #6e8795;
  color:transparent;
  text-align:center;
  user-select:none;
}
/* Single-term vocabulary prompts keep the compact old-reading feel without reverting layout. */
.question-text > ruby:only-child,
.question-text.question-dialogue > ruby:only-child{
  letter-spacing:.08em;
}
/* N2 visible fill-in blank */
.question-blank{display:inline-block!important;min-width:4ch!important;text-align:center!important;border-bottom:0!important;text-decoration:none!important;color:inherit!important;font-weight:750!important;letter-spacing:.06em!important;line-height:1!important;vertical-align:baseline!important;user-select:none!important}
.question-blank::before{content:"____"}

/* Phase 7: mobile fixed quiz controls respect device safe area. */
@media(max-width:900px){
  .page{padding-bottom:calc(62px + env(safe-area-inset-bottom))!important}
  .quiz-controls{padding-bottom:env(safe-area-inset-bottom)!important}
}