:root{color-scheme:light;--bg:#f7f5fe;--paper:#fff;--panel:#fff;--panel-soft:#f8f6ff;--ink:#161124;--soft-ink:#463b61;--muted:#615676;--line:#e9e2fa;--accent:#6749cf;--accent-hover:#5136b5;--accent-soft:#f0eaff;--peach:#f988a3;--shadow:0 17px 39px rgba(77,51,147,.145),0 4px 12px rgba(70,49,137,.065);--shadow-soft:0 7px 19px rgba(80,55,147,.11),0 2px 6px rgba(70,45,120,.045);--shadow-modal:0 28px 80px rgba(60,39,110,.24);--hero:linear-gradient(120deg,#5740b9 0%,#7656d8 55%,#a16adb 100%);--sidebar:rgba(255,255,255,.95);--radius:22px}
:root[data-theme="dark"]{color-scheme:dark;--bg:#130e24;--paper:#211935;--panel:#261d3e;--panel-soft:#2d2448;--ink:#fff;--soft-ink:#e5dcff;--muted:#c1b5dc;--line:#493a68;--accent:#b59bff;--accent-hover:#cabaff;--accent-soft:#3a2a63;--peach:#ff9db8;--shadow:0 19px 45px rgba(3,0,14,.62),0 4px 12px rgba(5,0,17,.32);--shadow-soft:0 9px 24px rgba(4,0,16,.35),0 2px 8px rgba(5,0,20,.22);--shadow-modal:0 35px 100px rgba(0,0,0,.74);--hero:linear-gradient(125deg,#352069,#4f2b9a 50%,#7945a5);--sidebar:#1d1730}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:system-ui,-apple-system,'Segoe UI',Arial,sans-serif;color:var(--ink);background:radial-gradient(ellipse 850px 530px at 95% -15%,rgba(154,122,233,.15),transparent),radial-gradient(ellipse 650px 480px at -10% 110%,rgba(249,136,163,.11),transparent),var(--bg);margin:0;line-height:1.55}button,a{font:inherit}button{cursor:pointer}a{text-decoration:none;color:inherit}button:focus-visible,a:focus-visible{outline:3px solid #f5a840;outline-offset:3px}button:disabled{cursor:default}.app-shell{display:flex;min-height:100vh}.sidebar{width:286px;flex:0 0 286px;min-height:100vh;position:sticky;top:0;height:100vh;overflow:auto;background:var(--sidebar);border-right:1px solid var(--line);padding:27px 16px 19px;display:flex;flex-direction:column;box-shadow:7px 0 35px rgba(63,45,127,.035);z-index:35}.brand{display:flex;align-items:center;gap:12px;padding:0 12px 26px}.brand-symbol{width:49px;height:49px;flex:none;display:grid;place-items:center;color:#fff;border-radius:15px;background:linear-gradient(140deg,#5740b9,#a16adb);box-shadow:0 8px 17px #6749cf3b}.brand-symbol svg{width:33px;height:33px}.brand-copy{display:flex;flex-direction:column;gap:1px}.brand-copy strong{font-size:17px;letter-spacing:.1em;font-weight:860}.brand-copy small{color:var(--muted);font-size:11px;font-weight:700}.sidebar-kicker{font-size:10px;color:var(--muted);font-weight:850;letter-spacing:.16em;padding:10px 14px 9px}.side-nav{display:grid;gap:5px}.nav-main{width:100%;display:flex;align-items:center;text-align:left;gap:11px;padding:14px 12px;border:none;background:transparent;color:var(--soft-ink);border-radius:14px;font-size:14px;font-weight:750;transition:background .16s,transform .16s,color .16s}.nav-main:hover{background:var(--accent-soft);color:var(--accent)}.nav-main.current{background:var(--accent-soft);color:var(--accent)}.nav-main span{flex:1}.nav-icon,.chevron{width:21px;height:21px;flex:none;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}.chevron{width:15px;transition:transform .2s}.nav-main[aria-expanded="true"] .chevron{transform:rotate(180deg)}.submenu{display:grid;gap:3px;padding:6px 0 9px 41px}.submenu[hidden]{display:none}.submenu a{position:relative;display:flex;align-items:center;min-height:38px;border-radius:10px;padding:7px 12px;color:var(--muted);font-size:13px;font-weight:750;transition:background .15s,color .15s}.submenu a:hover{color:var(--accent);background:var(--accent-soft)}.submenu a.selected{color:var(--accent);background:var(--accent-soft)}.submenu a.selected:before{content:'';height:6px;width:6px;background:var(--accent);border-radius:100%;position:absolute;left:2px}.sidebar-bottom{margin-top:auto;padding:16px 9px 3px}.side-note{display:flex;gap:9px;align-items:flex-start;border-radius:14px;background:var(--panel-soft);border:1px solid var(--line);padding:13px;color:var(--muted);font-size:12px;font-weight:650}.note-dot{width:8px;height:8px;border-radius:50%;background:var(--peach);margin-top:5px;flex:none}.side-controls{margin-top:15px;display:flex;flex-direction:column;gap:7px}.control-label{font-size:11px;color:var(--muted);font-weight:760}.theme-button{width:100%;display:flex;align-items:center;gap:10px;justify-content:center;min-height:43px;border:1px solid var(--line);border-radius:13px;background:var(--paper);color:var(--soft-ink);font-size:13px;font-weight:780}.theme-button svg,.theme-mobile svg{width:18px;height:18px;stroke:currentColor;stroke-width:1.8;stroke-linejoin:round;stroke-linecap:round}.theme-button:hover{background:var(--accent-soft)}.main-area{min-width:0;flex:1;display:flex;flex-direction:column}.topbar{height:77px;display:flex;align-items:center;justify-content:space-between;gap:15px;padding:0 clamp(18px,3vw,46px);border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:0;z-index:22}.topbar-left,.topbar-right{display:flex;align-items:center;gap:13px;min-width:0}.breadcrumb{font-size:13px;font-weight:730;display:flex;gap:9px;align-items:center;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.breadcrumb span:first-child{color:var(--muted)}.crumb-sep{color:#b39ccf}.edition{font-size:11px;color:var(--muted);font-weight:700;white-space:nowrap}.language-switch{display:flex;gap:3px;border:1px solid var(--line);border-radius:12px;padding:4px;background:var(--panel-soft)}.language-switch button{border:0;background:none;color:var(--muted);font-size:12px;font-weight:850;padding:7px 9px;border-radius:8px;min-height:34px}.language-switch button.selected{background:var(--accent);color:var(--paper);color:#fff;box-shadow:0 3px 12px #6749cf2b}.theme-mobile,.menu-button{border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:12px;display:none;place-items:center;min-width:43px;min-height:43px}.theme-mobile svg,.menu-button svg{width:22px;height:22px;stroke:currentColor;stroke-width:2;fill:none;stroke-linecap:round}.page-content{width:100%;max-width:1450px;padding:30px clamp(18px,3vw,46px) 56px;flex:1;margin:0 auto;outline:0}.hero{background:var(--hero);color:#fff;border-radius:27px;min-height:226px;position:relative;overflow:hidden;box-shadow:0 20px 45px #55409b35;display:flex;align-items:center;justify-content:space-between;padding:clamp(25px,4vw,43px);gap:25px}.hero-content{position:relative;z-index:2;max-width:670px}.hero-kicker{text-transform:uppercase;font-size:11px;font-weight:850;letter-spacing:.15em;color:#fff;opacity:.94}.hero h1{font-size:clamp(27px,3.2vw,44px);letter-spacing:-.055em;line-height:1.13;font-weight:880;margin:11px 0 11px}.hero p{font-size:clamp(14px,1.3vw,16px);margin:0;color:#fff;max-width:620px;opacity:.94;font-weight:550}.hero-art{position:absolute;width:300px;height:300px;right:25px;top:-35px;opacity:.26;transform:rotate(-11deg)}.hero-art svg{width:100%;height:100%;stroke:#fff;stroke-width:1.4;fill:none}.hero-chip{margin-top:18px;display:inline-flex;padding:7px 11px;background:#ffffff26;border:1px solid #ffffff50;border-radius:11px;font-size:12px;font-weight:760}.section-title-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:30px 0 16px}.section-title-row h2{margin:0;font-size:22px;letter-spacing:-.035em}.section-desc{color:var(--muted);font-size:13px;font-weight:650}.tiles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.tile{position:relative;min-height:257px;display:flex;flex-direction:column;align-items:stretch;text-align:left;padding:24px;background:var(--paper);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow-soft);overflow:hidden;color:var(--ink);transition:transform .18s,box-shadow .18s,border-color .18s}.tile:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#bfaaf1}.tile:focus-visible{outline-offset:4px}.tile::after{content:attr(data-number);position:absolute;right:12px;top:-19px;color:var(--accent);opacity:.055;font-weight:900;font-size:133px;letter-spacing:-.08em;line-height:1;pointer-events:none}.tile.active-tile{border-color:#bba4f8;background:linear-gradient(150deg,var(--paper) 66%,var(--accent-soft));box-shadow:var(--shadow)}.tile-top{display:flex;justify-content:space-between;align-items:center;position:relative;z-index:2}.tile-icon{width:54px;height:54px;display:grid;place-items:center;border-radius:16px;background:var(--panel-soft);color:var(--accent)}.tile-icon svg{width:30px;height:30px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.tile.active-tile .tile-icon{background:linear-gradient(140deg,#f8b2c8,#f9e1c9);color:#6a3082}.tile-status{font-size:11px;color:var(--muted);font-weight:750}.tile-status.ready{color:#2d7654;background:#e7f7e9;padding:6px 9px;border-radius:9px}html[data-theme="dark"] .tile-status.ready{color:#b7ffd9;background:#204a40}.tile h3{position:relative;z-index:2;margin:22px 0 7px;font-size:18px;letter-spacing:-.035em;line-height:1.33;font-weight:840}.tile p{position:relative;z-index:2;font-size:13px;color:var(--muted);margin:0 0 auto;min-height:43px;line-height:1.45}.tile-bottom{z-index:2;display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:20px;color:var(--accent);font-size:12px;font-weight:830}.tile-bottom svg{width:18px;height:18px;stroke:currentColor;stroke-width:2;fill:none}.section-callout{display:flex;align-items:start;gap:15px;padding:18px 20px;background:var(--panel);border-radius:17px;border:1px solid var(--line);box-shadow:var(--shadow-soft);margin-top:25px}.callout-icon{background:var(--accent-soft);border-radius:11px;flex:none;display:grid;place-items:center;font-size:20px;width:40px;height:40px}.section-callout h3{font-size:14px;margin:0 0 4px}.section-callout p{font-size:13px;color:var(--muted);margin:0}.info-layout{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(220px,1fr);gap:20px;margin-top:26px}.info-panel{background:var(--paper);border-radius:22px;border:1px solid var(--line);padding:28px;box-shadow:var(--shadow-soft)}.info-panel h2{margin:0 0 13px;font-size:20px;letter-spacing:-.04em}.info-panel p{color:var(--muted);margin:0 0 12px;font-size:15px}.info-panel ul{color:var(--muted);padding-left:22px}.about-emblem{min-height:250px;background:radial-gradient(ellipse at 50% 42%,#e9dffc,var(--accent-soft));border:1px solid var(--line);border-radius:22px;display:grid;place-items:center;color:#8069be;box-shadow:var(--shadow-soft)}html[data-theme="dark"] .about-emblem{background:radial-gradient(ellipse at 50% 42%,#514279,#352951)}.about-emblem svg{width:min(72%,260px);stroke:currentColor;fill:none;stroke-width:1.2}.placeholder-note{font-size:12px;font-weight:800;letter-spacing:.035em;color:var(--accent)}.class-strip{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;margin:25px 0 10px}.class-link{display:grid;place-items:center;min-height:61px;border-radius:14px;border:1px solid var(--line);background:var(--paper);box-shadow:var(--shadow-soft);font-weight:840;color:var(--soft-ink);font-size:13px}.class-link:hover,.class-link.selected{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}.footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:18px clamp(18px,3vw,46px) 22px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;font-weight:650}.info-dialog{border:0;border-radius:22px;background:var(--paper);color:var(--ink);width:min(430px,calc(100vw - 28px));padding:0;box-shadow:var(--shadow-modal)}.info-dialog::backdrop{background:rgba(17,11,38,.65);backdrop-filter:blur(5px)}.dialog-body{padding:32px;text-align:center}.dialog-symbol{font-size:41px;color:var(--accent)}.dialog-body h2{margin:8px 0 12px;font-size:23px;letter-spacing:-.04em}.dialog-body p{margin:0 0 24px;color:var(--muted);font-size:15px}.primary-button{min-height:45px;border:0;border-radius:12px;background:linear-gradient(115deg,#6146c7,#9571e0);color:#fff;font-size:14px;font-weight:780;padding:12px 21px}.overlay[hidden]{display:none}.overlay{position:fixed;inset:0;background:rgba(12,8,30,.65);z-index:29}.mobile-note{display:none}html[data-theme="dark"] .tile{border-color:#4a3b6b}html[data-theme="dark"] .tile:hover{border-color:#9d86d7}html[data-theme="dark"] .topbar{background:#211935}
@media(max-width:1320px){.sidebar{width:260px;flex-basis:260px}.tiles{gap:15px}.tile{padding:20px}}
@media(max-width:1040px){.tiles{grid-template-columns:repeat(2,minmax(0,1fr))}.edition{display:none}.hero-art{right:-55px}.class-strip{grid-template-columns:repeat(3,1fr)}}
@media(max-width:780px){.sidebar{position:fixed;left:0;top:0;height:100dvh;width:min(310px,90vw);transform:translateX(-110%);transition:transform .23s;box-shadow:var(--shadow-modal)}.sidebar.is-open{transform:translateX(0)}.menu-button,.theme-mobile{display:grid}.topbar{height:66px;padding:0 14px}.breadcrumb{font-size:12px}.language-switch button{min-width:33px;padding:6px 7px}.topbar-right{gap:7px}.page-content{padding:17px 12px 36px}.hero{border-radius:21px;min-height:195px;padding:27px 22px}.hero-art{width:230px;height:230px;right:-85px;top:-20px}.hero h1{font-size:clamp(25px,5.4vw,33px)}.tiles{gap:13px}.tile{min-height:236px}.info-layout{grid-template-columns:1fr}.section-title-row{margin-top:25px}.footer{padding:17px}.mobile-note{display:inline}.hero-chip{font-size:11px}}
@media(max-width:560px){.tiles{grid-template-columns:1fr}.tile{min-height:206px}.tile h3{margin-top:16px}.tile p{min-height:0}.class-strip{grid-template-columns:repeat(3,minmax(0,1fr))}.hero{min-height:198px}.topbar-left{gap:8px}.breadcrumb span:first-child{display:none}.crumb-sep{display:none}.breadcrumb{max-width:120px}.info-panel{padding:20px}.section-callout{padding:15px}.section-title-row h2{font-size:20px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
/* Navigation contrast in the dark theme: preserve readable active and hover states. */
html[data-theme="dark"] .nav-main.current,
html[data-theme="dark"] .nav-main:hover{background:#43316f;color:#f9f6ff}
html[data-theme="dark"] .nav-main.current .nav-icon,
html[data-theme="dark"] .nav-main.current .chevron{stroke:#e0d0ff}
html[data-theme="dark"] .submenu a.selected,
html[data-theme="dark"] .submenu a:hover{background:#43316f;color:#fff}
html[data-theme="dark"] .submenu a.selected:before{background:#ffbbd3}
html[data-theme="dark"] .class-link.selected,
html[data-theme="dark"] .class-link:hover{background:#453477;color:#fff}
@media(max-width:350px){.topbar .breadcrumb{display:none}.topbar{gap:6px}.topbar-right{gap:4px}.language-switch button{min-width:30px;padding:6px 5px}}

/* PWA extras — shared design tokens: light/dark, typography, shadows */
.offline-panel{display:flex;align-items:center;gap:16px;padding:20px 22px;margin-top:25px;background:var(--paper);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow-soft)}
.offline-icon{width:48px;height:48px;flex:0 0 48px;display:grid;place-items:center;border-radius:15px;background:var(--accent-soft);color:var(--accent);font-size:29px;font-weight:800}
.offline-copy{flex:1;min-width:0}.offline-copy h3{margin:0 0 5px;font-size:17px;letter-spacing:-.02em}.offline-copy p{margin:0 0 5px;color:var(--muted);font-size:13px}.offline-status{font-size:12px;font-weight:800;color:var(--accent)}
.offline-controls{display:flex;flex-direction:column;align-items:stretch;gap:8px}.offline-controls button{min-height:44px;max-width:230px}.secondary-button{border-radius:12px;padding:10px 15px;color:var(--ink);background:var(--panel-soft);border:1px solid var(--line);font-weight:760}.secondary-button:hover{background:var(--accent-soft)}
.install-top-button{border-radius:11px;border:1px solid var(--line);background:var(--accent-soft);color:var(--accent);padding:9px 12px;font-weight:800;font-size:12px;min-height:40px}
.update-banner{position:fixed;z-index:100;bottom:18px;right:18px;max-width:min(470px,calc(100vw - 32px));display:flex;align-items:center;gap:10px;flex-wrap:wrap;background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:13px 15px;box-shadow:var(--shadow);color:var(--ink);font-size:13px;font-weight:750}
.update-banner[hidden]{display:none}.update-banner button{background:var(--accent-soft);color:var(--accent);border:1px solid var(--line);border-radius:9px;padding:7px 10px;font-weight:800}.update-banner #dismissUpdate{font-size:20px;line-height:1;background:transparent}
@media(max-width:950px){.offline-panel{align-items:flex-start;flex-wrap:wrap}.offline-controls{width:100%;flex-direction:row;flex-wrap:wrap}.install-top-button{font-size:11px}}
@media(max-width:560px){.offline-panel{padding:17px 15px;gap:12px}.offline-icon{width:42px;height:42px;flex-basis:42px}.offline-controls{flex-direction:column}.offline-controls button{width:100%;max-width:none}.topbar .install-top-button{max-width:100px;padding:7px 8px;font-size:10px}}