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small{text-align:right;color:#bfd0e6}.history-item{display:flex;justify-content:space-between}.history-item strong{color:var(--gold)}.reset-area{margin-top:30px;padding-top:15px;border-top:1px solid #425574;font-size:11px;color:#b9c8df}.reset-area button{border:0;background:none;color:#ffc4cc;text-decoration:underline;font-size:11px;padding:7px 0}.confirm-dialog{max-width:min(420px,calc(100vw - 28px));border:1px solid #aebfe0;border-radius:15px;background:#1a2a47;color:#fff;padding:0;box-shadow:0 30px 80px #000c}.confirm-dialog::backdrop{background:#050a17bd;backdrop-filter:blur(4px)}.confirm-dialog form{padding:27px}.confirm-symbol{font-size:35px;color:var(--gold)}.confirm-dialog h2{font-size:22px;margin:8px 0}.confirm-dialog p{font-size:13px;color:#cbd6e9;line-height:1.7}.confirm-actions{display:flex;gap:9px;margin-top:20px}.confirm-actions button{flex:1}.toast{position:fixed;bottom:20px;right:20px;z-index:40;background:#274e57;color:white;border:1px solid var(--aqua);border-radius:9px;padding:12px 15px;font-size:12px;box-shadow:0 8px 20px #0009}.noscript-note{position:fixed;bottom:10px;left:10px;right:10px;background:#31293f;color:white;padding:12px;font-size:13px;z-index:50}
@keyframes enemy-hit{25%{transform:translateX(-54%) rotate(-8deg) scale(.9);filter:brightness(2)}65%{transform:translateX(-46%) rotate(7deg)}}@keyframes screen-hurt{25%{transform:translateX(-5px)}60%{transform:translateX(5px)}}
@media(max-width:1160px){.home-layout{grid-template-columns:minmax(0,1fr)}.home-side{position:static;grid-template-columns:repeat(3,minmax(0,1fr))}.stage-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.challenge-panel,.record-panel,.how-panel{min-width:0}}
@media(max-width:850px){.sidebar{width:70px;padding:18px 7px}.brand{padding:0 8px 30px}.brand>span:last-child,.sidebar-label,.sidebar-guide{display:none}.side-nav{gap:8px}.nav-item{padding:8px;display:grid;place-items:center;font-size:0;gap:0}.nav-item>span:first-child{font-size:25px}.nav-count{font-size:10px}.topbar{padding:0 22px}.stage-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.home-side{grid-template-columns:repeat(2,minmax(0,1fr))}.how-panel{grid-column:1/-1}}
@media(max-width:620px){.app-shell{display:block}.sidebar{position:fixed;top:auto;bottom:0;left:0;right:0;width:100%;height:63px;border-right:0;border-top:1px solid #465d7c;background:#0c1629f2;padding:5px 8px;z-index:20}.sidebar>.brand,.sidebar-label,.sidebar-guide{display:none}.side-nav{grid-template-columns:repeat(4,1fr);gap:3px;height:100%}.nav-item{display:flex;flex-direction:column;justify-content:center;gap:2px;min-height:0;padding:3px 2px;font-size:9px;line-height:1.1;text-align:center;border-radius:7px;white-space:nowrap}.nav-item>span:first-child{font-size:20px;width:auto}.nav-count{position:absolute;margin-left:42px;margin-top:-24px}.topbar{height:58px;padding:0 15px}.mobile-brand{display:flex;align-items:center;gap:7px;font-size:18px;letter-spacing:.1em}.mobile-brand .brand-mark{width:30px;height:30px;font-size:18px}.topbar-title{display:none}.topbar-stats{gap:5px}.stat-chip,.level-chip{font-size:11px;min-height:29px;padding:3px 6px}.stat-chip small{display:none}main{padding:13px 13px 90px}.hero{min-height:0}.hero-image{background:linear-gradient(90deg,#0c172de8 0%,#0d1839ba 80%),url('./assets/world-journey.png') center/cover}.hero-content{padding:27px 22px}.hero h1{font-size:clamp(29px,8vw,39px);margin:12px 0}.hero p{font-size:12px}.hero-facts{gap:13px;margin:17px 0}.hero-facts strong{font-size:18px}.hero-facts small{font-size:9px}.hero-actions{gap:7px}.hero-actions .button{min-height:42px;font-size:12px;padding:9px 12px}.hero-stamp{width:55px;height:55px;font-size:6px;right:12px;top:10px;padding:6px}.difficulty-panel{padding:16px;margin:14px 0 25px}.panel-heading{align-items:start}.panel-heading h2,.section-heading h2{font-size:22px}.panel-heading p,.section-heading p{font-size:11px}.difficulty-total strong{font-size:20px}.difficulty-options{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:14px}.difficulty-options button{min-height:83px;padding:10px}.difficulty-options strong{font-size:15px}.difficulty-options small{font-size:10px}.difficulty-caption{font-size:11px}.section-heading{align-items:start}.map-clear-badge{padding:6px 8px;font-size:10px}.map-clear-badge strong{font-size:14px}.stage-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.chapter{padding:17px}.chapter-head h3{font-size:17px}.stage-node{min-height:104px;padding:10px}.stage-node strong{font-size:13px}.home-side{grid-template-columns:1fr}.how-panel{grid-column:auto}.quiz-top{font-size:11px}.arena{height:222px}.enemy-creature{transform:translateX(-50%) scale(.8);transform-origin:bottom}.arena.is-hit .enemy-creature{animation:none}.arena-ground{gap:8px;padding:5px 8px}.arena-callout{font-size:10px}.player-status strong{font-size:13px}.combo-status strong{font-size:15px}.question-panel{padding:18px}.question-panel h1{font-size:19px}.choices{grid-template-columns:1fr;gap:8px}.choice{min-height:57px;font-size:12px}.answer-toolbar{align-items:flex-start;flex-direction:column}.hint-button{align-self:flex-end}.stats-overview{grid-template-columns:repeat(2,1fr)}.review-item{align-items:start;flex-wrap:wrap}.review-item button{margin-left:auto}.review-summary{flex-direction:column;align-items:start}.result-stats{gap:5px}.result-stats strong{font-size:17px}.result-stats small{font-size:9px}}
@media(max-width:360px){.hero h1{font-size:28px}.hero-facts{gap:9px}.hero-actions .button{width:100%}.stage-grid{grid-template-columns:1fr}.stage-node{min-height:90px}.difficulty-total{display:none}.chapter-head>span:last-child{display:none}.topbar-stats .stat-chip:first-child{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
.nav-item{position:relative}
.difficulty-count{align-self:flex-end;color:var(--tone);font-size:11px;font-weight:900;line-height:1}
.stage-period{color:var(--chapter);font-size:10px;line-height:1.35;font-weight:800}
@media(max-width:620px){.difficulty-options button{min-height:100px}}
.enemy-creature{background:radial-gradient(circle at 50% 38%,color-mix(in srgb,var(--enemy-tone,#a68ce6) 70%,#37316e),#282344 58%,#15152e 78%);filter:drop-shadow(0 0 22px var(--enemy-tone,#a68ce6))}.creature-core{color:var(--enemy-tone,#ddcaff)}
.hero-image{background:linear-gradient(90deg,#07152cd6 0%,#0b1b37bb 36%,#0e214955 68%,#0d162d1c 100%),url('./assets/world-journey.png') center right/cover no-repeat}
@media(max-width:620px){.hero-image{background:linear-gradient(90deg,#08162ddd 0%,#0c1b37ba 100%),url('./assets/world-journey.png') 65% center/cover no-repeat}}
.topbar{position:relative;z-index:30}.topbar-tools{display:flex;align-items:center;gap:10px;min-width:0}.audio-settings{flex:none}.audio-settings summary{list-style:none;display:flex;align-items:center;justify-content:center;gap:7px;min-height:34px;padding:5px 11px;border:1px solid #536883;border-radius:9px;background:#1a2c49;color:#f0e5bd;font-size:12px;font-weight:900;cursor:pointer}.audio-settings summary::-webkit-details-marker{display:none}.audio-settings summary:hover,.audio-settings[open] summary{background:#29456d;border-color:#a7bfd5}.audio-settings summary:focus-visible{outline:3px solid var(--aqua);outline-offset:3px}.audio-summary-icon{font-size:18px;line-height:1}.audio-settings.is-muted .audio-summary-icon{opacity:.5}.audio-panel{position:fixed;right:clamp(12px,3vw,48px);top:65px;width:min(310px,calc(100vw - 24px));padding:18px;border:1px solid #7389a8;border-radius:13px;background:#152540;box-shadow:0 18px 40px #030814c9;color:#f4f6fd;z-index:100}.audio-panel>strong{font-size:15px}.audio-panel>p{margin:4px 0 15px;color:#bfcee3;font-size:11px}.audio-setting{border-top:1px solid #405675;padding-top:12px;margin-top:11px}.audio-setting-head,.audio-volume{display:flex;align-items:center;justify-content:space-between;gap:12px}.audio-setting-head>label:first-child{font-size:13px;font-weight:900}.audio-switch{display:flex;align-items:center;gap:5px;font-size:10px;font-weight:900;color:#d3e3ee;cursor:pointer}.audio-switch input{appearance:none;position:relative;width:32px;height:18px;margin:0;border:1px solid #869bb4;border-radius:20px;background:#546173;cursor:pointer}.audio-switch input:before{content:"";position:absolute;top:2px;left:2px;width:12px;height:12px;border-radius:50%;background:#e8edf5;transition:transform .16s}.audio-switch input:checked{background:#28a8b8;border-color:#72e2e6}.audio-switch input:checked:before{transform:translateX(14px);background:#fff}.audio-switch input:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.audio-volume{margin-top:10px}.audio-volume input{width:100%;accent-color:#5dd9de;cursor:pointer}.audio-volume output{width:40px;flex:none;text-align:right;font-size:12px;font-weight:800;color:#d2eaf1}
@media(max-width:620px){.topbar-tools{gap:6px}.audio-settings summary{width:32px;height:32px;min-height:32px;padding:0}.audio-summary-label{display:none}.audio-panel{top:53px;right:10px;width:min(300px,calc(100vw - 36px))}}
@media(max-width:360px){.topbar-tools{gap:4px}}

/* 勉強モード: 章の索引と、一つずつ読み進める史書の紙面。 */
.study-entry{display:flex;align-items:center;justify-content:space-between;gap:22px;margin:24px 0;padding:25px 28px;border:1px solid #b49255;border-radius:16px;background:radial-gradient(circle at 93% 15%,#65512d 0,transparent 26%),linear-gradient(115deg,#162e43,#17213a);box-shadow:0 10px 28px #03091570}
.study-entry h2{margin:5px 0 8px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(22px,2.3vw,30px);line-height:1.35;color:#ffe0a0}
.study-entry p{margin:0;color:#e8ebf3;font-size:14px;line-height:1.75}
.study-entry-discovery{margin-top:15px!important;padding-top:12px;border-top:1px solid #736f66;color:#f6d790!important}
.study-entry-discovery strong{color:#fff;font-weight:700}
.study-entry-discovery button{margin-left:8px;padding:4px 0;border:0;background:none;color:#b9f0f3;font-weight:800;text-decoration:underline;text-underline-offset:3px}
.study-entry-action{min-width:175px;display:flex;flex-direction:column;align-items:flex-end;gap:13px}.study-entry-action>span{color:#d9e6ee;font-size:13px;font-weight:800}.study-entry-action strong{font-size:25px;color:#ffe180}
.study-page-head{display:flex;align-items:end;justify-content:space-between;gap:20px;padding:23px 0 27px;border-bottom:1px solid #5c6b82}.study-page-head h1{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(32px,4vw,49px);line-height:1.25;margin:8px 0}.study-page-head p{max-width:740px;color:#d8e3f0;font-size:15px;line-height:1.8;margin:0}.study-progress-card{min-width:166px;padding:14px 16px;border:1px solid #5a728b;border-radius:11px;background:#1a2b43}.study-progress-card strong{display:block;font-size:26px;color:#f8d77e;text-align:right}.study-progress-card small{font-size:12px;color:#d1dbe8}.study-progress-track{height:8px;overflow:hidden;margin-top:10px;border-radius:9px;background:#34455b}.study-progress-track>span{display:block;height:100%;background:linear-gradient(90deg,#7bdad4,#ffd678)}
.study-toolbar{display:flex;align-items:center;gap:11px;flex-wrap:wrap;padding:19px 0}.study-toolbar label{font-weight:800;font-size:14px}.study-toolbar select{min-height:45px;max-width:min(100%,430px);min-width:250px;padding:9px 12px;border:1px solid #8195ac;border-radius:8px;background:#1a2a45;color:#fff;font:inherit;font-size:14px}.study-toolbar select:focus-visible{outline:3px solid var(--aqua);outline-offset:2px}.study-resume{min-height:44px;padding:8px 12px;margin-left:auto;border:1px solid #71849d;border-radius:8px;background:#182c46;color:#e7f4fa;font-size:13px;font-weight:800}
.study-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:22px;align-items:start}.study-index{position:sticky;top:15px;max-height:calc(100vh - 30px);overflow:auto;border:1px solid #3e5872;border-radius:12px;background:#10213a;padding:13px 8px;scrollbar-color:#6b8099 #10213a}.study-index-group{margin-bottom:14px}.study-index-group h2{display:flex;align-items:center;gap:8px;margin:0 6px 5px;padding:5px 3px;color:#e1dcba;font-size:12px}.study-index-group h2 span{color:#85dce4}.study-index button{display:flex;align-items:center;gap:8px;width:100%;min-height:38px;padding:5px 8px;border:1px solid transparent;border-radius:7px;background:transparent;color:#c8d7e7;text-align:left;font-size:12px}.study-index button:hover,.study-index button.is-current{border-color:#608ba2;background:#24405d;color:#fff}.study-index button>span:first-child{font-size:10px;color:#8fc7d0}.study-index button>span:nth-child(2){flex:1}.study-index button>span:last-child{color:#f5d078;font-weight:900}.study-article{min-width:0;overflow:hidden;border:1px solid #5b6f87;border-radius:15px;background:#13243b;box-shadow:0 14px 38px #03091780}.study-article-banner{position:relative;padding:30px clamp(20px,3vw,39px) 27px;background:radial-gradient(circle at 93% 20%,var(--study-accent) 0,transparent 28%),linear-gradient(115deg,#142a43,#1a2841);border-bottom:1px solid #6a7790}.study-article-overline{color:#a4e8e7;letter-spacing:.13em;font-size:11px;font-weight:900}.study-article-group{display:inline-block;margin:12px 0 0;color:#f8da92;font-size:13px;font-weight:800}.study-article-banner h2{font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(29px,3vw,41px);line-height:1.25;margin:8px 0 8px}.study-article-banner p{margin:0;color:#e1e7f0;font-size:14px;line-height:1.6}.study-read-badge{position:absolute;right:20px;top:20px;padding:5px 10px;border:1px solid #91d3b9;border-radius:20px;background:#1f4d49;color:#ddfff2;font-size:12px;font-weight:900}
.study-flow{padding:25px clamp(20px,3vw,39px) 6px}.study-flow section{position:relative;padding:0 0 25px 27px;border-left:2px solid #536d83}.study-flow section:before{content:"";position:absolute;left:-6px;top:0;width:10px;height:10px;border-radius:50%;background:#edc977;box-shadow:0 0 0 4px #283d55}.study-flow section:last-child{border-left-color:transparent}.study-flow section>span{display:block;color:#a7e1e5;font-size:11px;font-weight:900;letter-spacing:.12em}.study-flow h3{margin:4px 0 9px;font-size:18px;color:#fff}.study-flow p{margin:0;color:#e1e8f1;font-size:16px;line-height:1.85}.study-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:0 clamp(20px,3vw,39px) 23px}.study-detail-grid>section{min-width:0;padding:21px;border:1px solid #607385;border-radius:11px;background:#1b3047}.study-detail-grid h3,.study-check h3,.study-sources h3{margin:5px 0 13px;font-size:18px}.study-terms ul{padding:0;margin:0;list-style:none}.study-terms li{display:flex;flex-direction:column;gap:4px;padding:9px 0;border-top:1px solid #52677a;font-size:14px;line-height:1.6}.study-terms li strong{color:#f8d688}.study-terms li span{color:#e3ebf4}.study-trivia{background:linear-gradient(135deg,#3b3140,#283e4d)!important}.study-trivia p{margin:0;color:#fff1d6;font-size:16px;line-height:1.85}
.study-deep-dive{margin:0 clamp(20px,3vw,39px) 24px;padding:22px 24px;border-left:4px solid #f4cf78;background:linear-gradient(95deg,#26374c,#1a2e42)}.study-deep-dive h3{margin:5px 0 11px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:22px;color:#ffdf99}.study-deep-dive p{margin:0;font-size:16px;line-height:1.9;color:#f0f4f8}
.study-check{margin:0 clamp(20px,3vw,39px) 24px;padding:22px;border:1px solid #b79755;border-radius:11px;background:#302c38}.study-check>p{font-size:16px;line-height:1.8;font-weight:800;color:#fff;margin:0 0 15px}.study-answer{padding:14px 16px;margin:0 0 16px;border-left:3px solid #8cd8d0;background:#193a43}.study-answer strong{font-size:13px;color:#b1f4e9}.study-answer p{margin:5px 0 0;color:#eaf4f3;font-size:16px;line-height:1.75}.study-sources{padding:20px clamp(20px,3vw,39px);border-top:1px solid #53677e;background:#102033}.study-sources h3{font-size:16px}.study-sources p{margin:0 0 10px;color:#c9d5e4;font-size:14px;line-height:1.7}.study-sources ul{padding-left:19px;margin:0}.study-sources li{margin:6px 0;font-size:14px;line-height:1.5}.study-sources a{color:#baf3f4;text-underline-offset:3px}.study-footer{padding:19px clamp(20px,3vw,39px) 25px}.study-neighbors{display:flex;justify-content:space-between;gap:9px;margin-bottom:20px}.study-neighbors button{min-height:44px;padding:8px 11px;border:1px solid #75889c;border-radius:8px;background:#20374f;color:#f0f5fa;font-size:13px;font-weight:800}.study-neighbors span{font-size:13px;color:#f4dc95}.study-footer>.button{display:flex;width:100%}.study-footer>small{display:block;margin-top:9px;color:#c9d5e4;font-size:12px;text-align:center}
@media(max-width:980px){.study-layout{grid-template-columns:1fr}.study-index{display:none}.study-toolbar select{flex:1}}
@media(max-width:620px){.side-nav{grid-template-columns:repeat(5,minmax(0,1fr))}.study-entry{padding:18px;display:block;margin:14px 0}.study-entry p{font-size:14px}.study-entry-action{align-items:flex-start;margin-top:15px;gap:8px}.study-entry-action .button{width:100%}.study-page-head{display:block;padding:12px 0 18px}.study-page-head p{font-size:14px}.study-progress-card{margin-top:17px;max-width:190px}.study-toolbar{display:grid;grid-template-columns:1fr;gap:8px}.study-toolbar select{width:100%;min-width:0}.study-resume{margin-left:0;width:100%}.study-article-banner{padding:25px 19px}.study-read-badge{position:static;display:inline-block;margin-top:12px}.study-flow{padding:22px 19px 5px}.study-deep-dive{margin:0 19px 19px;padding:18px}.study-detail-grid{grid-template-columns:1fr;padding:0 19px 19px}.study-check{margin:0 19px 19px}.study-sources,.study-footer{padding-left:19px;padding-right:19px}.study-neighbors button{font-size:12px;max-width:49%}}
@media(max-width:360px){.side-nav{gap:1px}.nav-item{font-size:9px}.nav-item>span:first-child{font-size:18px}.study-entry-discovery button{margin-left:0;display:inline-block}.study-page-head h1{font-size:31px}}

/* Long-form history reading is the main lesson; the compact timeline below is its recap. */
.study-longread{margin:26px clamp(20px,3vw,39px) 8px;padding:30px clamp(21px,3.2vw,43px);border:1px solid #e4d6bb;border-radius:12px;background:#f3efe6;color:#1b2938;box-shadow:0 12px 30px #08132155}
.study-longread-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:15px;border-bottom:1px solid #c9bda8}
.study-longread-head span{font-size:11px;letter-spacing:.12em;font-weight:900;color:#336b73}
.study-longread-head small{font-size:12px;font-weight:800;color:#5f6870}
.study-longread>h3{margin:23px 0 4px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(24px,2.6vw,31px);line-height:1.45;color:#193849}
.study-longread-intro{margin:0 0 8px!important;color:#64707a!important;font-size:14px!important}
.study-longread-part{max-width:69ch;padding:24px 0 23px;border-bottom:1px solid #d9cebd}
.study-longread-part:last-of-type{border-bottom:0}
.study-longread-part h4{display:flex;align-items:baseline;gap:12px;margin:0 0 13px;color:#204b5b;font-size:20px;line-height:1.5}
.study-longread-part h4 span{color:#a47737;font-size:12px;letter-spacing:.1em}
.study-longread-part p{margin:0 0 12px;color:#243341;font-size:17px;line-height:2;letter-spacing:.015em}
.study-longread-part p:last-child{margin-bottom:0}
.study-longread-source{max-width:69ch;margin:10px 0 0;padding-top:19px;border-top:1px solid #c9bda8}
.study-longread-source strong{display:block;margin-bottom:9px;font-size:13px;color:#415867}
.study-longread-source a{display:inline-block;margin:0 16px 8px 0;color:#205d6d;font-size:13px;line-height:1.6;text-underline-offset:3px}
.study-recap-title{margin:18px clamp(20px,3vw,39px) 0}.study-recap-title h3{margin:5px 0 0;color:#ffe4a7;font-size:20px}
@media(max-width:620px){.study-longread{margin:18px 12px 5px;padding:22px 17px}.study-longread>h3{margin-top:19px}.study-longread-part{padding:21px 0}.study-longread-part h4{font-size:18px}.study-longread-part p{font-size:16px;line-height:1.9}}

/* 発見録: scientific field notes meet a luminous game HUD. */
:root{--ink:#effbf6;--muted:#b8d2d2;--line:#305369;--bg:#081922;--panel:#102c37;--gold:#b8f56c;--aqua:#7debd9;--pink:#ffa780}
body{background:radial-gradient(ellipse at 72% -12%,#165b63 0,transparent 42%),#081922}
.sidebar{background:#081b27;border-color:#28505b}
.brand-mark{border-color:#b8f56c;box-shadow:4px 4px 0 #38625a;background:#153e42;color:#b8f56c;font-family:system-ui,sans-serif;font-size:20px}
.nav-item:hover,.nav-item.is-active{background:#174553;border-color:#3b8081}
.topbar{background:#09212bd9;border-color:#315565}
.level-chip,.button-primary{background:linear-gradient(180deg,#d3ff90,#9ee653);border-color:#e5ffaf;color:#102f36}
.button-primary{box-shadow:0 4px 0 #477b3c}
.button-ghost{background:#123843df;border-color:#679b9c}
.hero{border-color:#579886;background:#0b2832;box-shadow:0 22px 60px #031317b8}
.hero:before{border-color:#9cdec344}
.hero-image{background:linear-gradient(90deg,#081c2de9 0%,#08242fd9 35%,#0a293385 59%,#0d2c3515 100%),url('./assets/science-journey.svg') center right/cover no-repeat}
.hero-kicker{background:#123f46dc;border-color:#7bdaa5;color:#ceff94}
.hero h1{font-family:"Noto Sans JP","Yu Gothic",Meiryo,system-ui,sans-serif;font-weight:950;line-height:1.24;letter-spacing:-.035em}
.hero h1 em{color:#c6fb7a}
.hero-stamp{border-color:#b7f27c99;color:#d8ffb0}
.difficulty-panel{border-color:#4d8b80;background:linear-gradient(145deg,#17414b,#102b39)}
.difficulty-options button{background:#10313f;border-color:#4b7882}
.difficulty-options button[aria-pressed="true"]{background:linear-gradient(145deg,#1c5055,#163944);box-shadow:inset 0 0 0 1px #ffffff2a,0 5px 0 #071e26}
.chapter{background:linear-gradient(145deg,#173543,#0d2735);border-color:#3a6872}
.chapter-head .chapter-crest{font-family:system-ui,sans-serif;font-size:16px;font-weight:900}
.stage-node{background:#102c3a;border-color:#426a73}
.stage-node:hover:not(:disabled){background:#1b4650}
.stage-node.is-cleared{background:linear-gradient(140deg,#284d46,#173b45);border-color:#a7d875}
.challenge-panel{background:radial-gradient(circle at 84% 23%,#b1f27245,transparent 39%),linear-gradient(150deg,#235246,#153a41);border-color:#7aad78}
.record-panel,.how-panel{background:#12323f;border-color:#3c6b72}
.study-entry{border-color:#77b995;background:radial-gradient(circle at 93% 15%,#52845961 0,transparent 30%),linear-gradient(115deg,#143b43,#152f40)}
.study-entry h2,.study-page-head h1,.study-article-banner h2{font-family:"Noto Sans JP","Yu Gothic",Meiryo,system-ui,sans-serif;font-weight:900;letter-spacing:-.025em}
.study-entry h2,.study-entry-action strong{color:#d7ffae}
.study-entry-discovery{border-color:#5d8e83;color:#aaf0ca!important}
.study-page-head{border-color:#447576}.study-progress-card{background:#16404b;border-color:#4d8282}.study-progress-card strong{color:#caff8d}
.study-index{background:#0d2c39;border-color:#49747b}.study-index button:hover,.study-index button.is-current{background:#1b5054;border-color:#78b0a0}
.study-article{background:#112f3a;border-color:#547b80}.study-article-banner{background:radial-gradient(circle at 93% 20%,var(--study-accent) 0,transparent 28%),linear-gradient(115deg,#103c44,#1b3a48);border-color:#5d8985}
.study-longread{background:#f1f5e9;border-color:#d2dfbd}
.study-longread-part{border-color:#d4dfc7}
.study-longread-part h4,.study-longread>h3{color:#1d5756}
.study-people{margin-top:18px;padding-top:24px;border-top:2px solid #c8dcb8}
.study-people h4{margin:0 0 14px;color:#245959;font-size:19px}
.study-people>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.study-person{padding:16px 18px;border:1px solid #c5d9bf;border-radius:9px;background:#fcfff6}
.study-person strong{display:block;color:#234e4d;font-size:15px}
.study-person p{margin:7px 0 0;color:#374f50;font-size:13px;line-height:1.75}
.arena{border-color:#5b9b8f;background:radial-gradient(ellipse at 50% 110%,#3b897063,transparent 53%),radial-gradient(circle at 72% 30%,#438e9b74,transparent 34%),linear-gradient(145deg,#0c303d,#154c54 59%,#092531)}
.arena-sky{background:linear-gradient(#c3f5dd0a 1px,transparent 1px),linear-gradient(90deg,#c3f5dd0a 1px,transparent 1px);background-size:34px 34px}
.enemy-creature{width:124px;height:124px;bottom:3px;border:2px solid color-mix(in srgb,var(--enemy-tone,#a9f081) 75%,white);border-radius:50%;clip-path:none;background:radial-gradient(circle at 34% 28%,#91fff1,#345c6b 34%,#123745 65%,#0b202c 82%);box-shadow:0 0 35px color-mix(in srgb,var(--enemy-tone,#a9f081) 50%,transparent)}
.enemy-creature:before{inset:-15px;border:2px dashed color-mix(in srgb,var(--enemy-tone,#a9f081) 75%,white);border-radius:50%;background:none;transform:rotate(-25deg)}
.enemy-creature:after{content:"";position:absolute;inset:16px;border:1px solid #c0fff2aa;border-radius:50%;transform:rotate(30deg) scaleX(.55)}
.creature-eye{display:none}
.creature-core{top:37px;color:#e9fff6;font-family:system-ui,sans-serif;font-size:34px;font-weight:900}
.arena-ground{background:#0a2a37dc;border-color:#4d8781}
.question-panel{background:linear-gradient(160deg,#173a47,#102e3b);border-color:#4e8384}
.choice{background:#214553;border-color:#598c8e}.choice:hover:not(:disabled){background:#2b5a65;border-color:#9adbd1}
@media(max-width:620px){.sidebar{background:#09222ded;border-color:#38716d}.side-nav{grid-template-columns:repeat(5,minmax(0,1fr))}.hero-image{background:linear-gradient(90deg,#09212eed 0%,#0a2831c5 100%),url('./assets/science-journey.svg') 64% center/cover no-repeat}.study-people>div{grid-template-columns:1fr}.study-person{padding:14px}}