/* ELRIC STUDIOS / V4.0
   Editorial precision over decoration. Semantic contrast and stable surfaces,
   a restrained glass control layer, performance-safe transform/opacity motion.
   Layered separately to keep the original V3 visual architecture intact. */
:root{
 --v4-ink:#191b21;--v4-ink-soft:#333641;--v4-subtle:#70747e;
 --v4-line:rgba(28,32,46,.085);--v4-elevation:0 16px 44px rgba(32,35,48,.044),0 2px 8px rgba(26,28,35,.022);
 --v4-accent:#2d559f;--v4-focus:rgba(71,115,189,.46);
 --v4-ease:cubic-bezier(.18,.78,.24,1);--v4-ease-quick:cubic-bezier(.22,.72,.25,1);
 --v4-hairline:1px solid var(--v4-line);
}
[data-theme="dark"]{
 --v4-ink:#f3f4f7;--v4-ink-soft:#d6d8df;--v4-subtle:#a7abb7;
 --v4-line:rgba(237,239,248,.082);--v4-elevation:0 16px 45px rgba(0,0,0,.16),0 2px 7px rgba(0,0,0,.075);
 --v4-accent:#afc5f7;--v4-focus:rgba(164,190,240,.68);
}
html{scroll-padding-top:90px;scroll-behavior:smooth}
body{font-kerning:normal;text-rendering:optimizeLegibility;letter-spacing:-.006em}
button,input,select,textarea{-webkit-tap-highlight-color:transparent}
button:not(:disabled){transition:background-color .18s var(--v4-ease-quick),color .18s var(--v4-ease-quick),border-color .18s var(--v4-ease-quick),box-shadow .2s var(--v4-ease-quick),transform .18s var(--v4-ease-quick)}
button:focus-visible,[role="button"]:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--v4-focus)!important;outline-offset:3px}
button:active:not(:disabled){transform:translateY(1px) scale(.993)}
.glass{-webkit-backdrop-filter:blur(20px) saturate(1.22);backdrop-filter:blur(20px) saturate(1.22)}
/* Sidebar is always dark; its control tokens must never inherit light glass colors. */
.sidebar.glass{background:linear-gradient(158deg,#25272e 0%,#1d1e24 52%,#17181d 100%);color:#f4f5f8;border-color:rgba(255,255,255,.11);box-shadow:inset -1px 0 rgba(255,255,255,.045);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.sidebar .brand{padding-bottom:24px}.sidebar .brand-icon{background:linear-gradient(150deg,#353740,#25262c);box-shadow:inset 0 1px rgba(255,255,255,.14),0 8px 20px rgba(0,0,0,.1)}
.sidebar .brand-type b{font-size:14px;letter-spacing:.25em;color:#f7f7fa}.sidebar .brand-type span{font-size:10px;letter-spacing:.38em;color:#d0d2dd}
.sidebar .sidebar-section-label{color:#aeb1bf;letter-spacing:.22em;font-size:10px}
.sidebar .side-link{min-height:48px;color:#c9cbd6;border-radius:12px;gap:13px}
.sidebar .side-link span:nth-child(2){font-weight:570;font-size:13px}.sidebar .side-link small{font-size:10.5px;color:#abb0bf}
.sidebar .side-link.active{background:rgba(245,246,255,.13);border-color:rgba(250,251,255,.13);box-shadow:inset 2px 0 0 #f1f4ff,0 4px 14px rgba(0,0,0,.05);color:#fff}
.sidebar .side-link.active small{color:#f0f1f5}.sidebar .side-link:hover{background:rgba(255,255,255,.105);color:#fff}
.sidebar .sidebar-tip{font-size:12px;color:#d5d7e0}.sidebar .side-settings{font-size:12px;color:#d4d7df}.sidebar .sidebar-foot{color:#a4a7b3;font-size:10px}
.topbar{background:var(--glass);border-bottom:1px solid var(--v4-line);box-shadow:0 1px 0 rgba(255,255,255,.23),0 7px 24px rgba(38,42,55,.02)}
.topbar .breadcrumbs{font-size:12px}.topbar .breadcrumbs strong{font-weight:660;letter-spacing:-.012em}
.top-status{font-size:12px}.status-dot{background:#5f9e7e}
#main{padding-top:clamp(38px,4.1vw,64px)}.workspace-foot{font-size:10px;letter-spacing:.18em}
.page-title{font-size:clamp(32px,3.3vw,46px);letter-spacing:-.062em;font-weight:640;line-height:1.12}
.hero-title{font-weight:620;letter-spacing:-.074em}.hero-description{font-size:15px;line-height:1.85}
.page-subtitle{font-size:14px;max-width:790px;line-height:1.88}
.eyebrow{font-size:11px;letter-spacing:.19em}.section-row h2{letter-spacing:-.04em;font-weight:660}
.section-label{font-size:11px;letter-spacing:.19em}.small{font-size:12.5px}.tiny{font-size:11.5px}
.panel{box-shadow:var(--v4-elevation);border-color:var(--v4-line);border-radius:21px}
.btn,.field,.text-area,.select{border-radius:12px}.btn{min-height:44px;font-weight:620;font-size:13px}
.btn-dark{background:#20232b;color:#f8f9fc;border-color:#20232b}
[data-theme="dark"] .btn-dark{background:#f0f2f8;color:#16181f;border-color:#f0f2f8}
[data-theme="dark"] .btn-dark:hover{background:#d9e1f1;color:#16181f}
.field,.text-area,.select{font-size:14px;line-height:1.6;min-height:47px}
.text-area{font-size:14px;line-height:1.76}.field::placeholder,.text-area::placeholder{color:var(--muted);opacity:.82}
.label{font-size:12.5px;color:var(--text);font-weight:610}
/* Preserve the V3 dark session banner; tighten its internal rhythm. */
.session-panel{position:relative;overflow:hidden;box-shadow:0 22px 56px rgba(17,18,26,.12),inset 0 1px rgba(255,255,255,.11)}
.session-panel::after{content:"";pointer-events:none;position:absolute;inset:0;border-radius:inherit;border:1px solid rgba(255,255,255,.095)}
.session-eyebrow{letter-spacing:.20em}.session-title{letter-spacing:-.048em}
.hero-deck-link{display:flex;align-items:center;gap:8px;margin:20px 0 0;padding:10px 12px;border:1px solid rgba(218,230,255,.22);border-radius:10px;background:rgba(217,228,252,.085);color:#f5f8ff;font-size:12px;font-weight:600;max-width:fit-content;line-height:1.4;text-align:left}
.hero-deck-link:hover{background:rgba(222,231,255,.15);border-color:rgba(243,247,255,.30)}.hero-deck-link svg:last-child{margin-left:3px}
.quick-card{border-color:var(--v4-line)}.quick-card strong{font-size:16px;font-weight:660;letter-spacing:-.033em}
.quick-card small{color:var(--muted);font-size:12px;line-height:1.75}.quick-card:hover{border-color:rgba(90,116,165,.21);box-shadow:0 19px 48px rgba(38,44,57,.07)}
/* A durable, exact Daily Deck: highlight the selected batch but not the whole screen. */
.import-preview{min-height:26px;display:flex;gap:6px;align-items:center;flex-wrap:wrap;padding:9px 2px 1px;font-size:12px;color:var(--muted);line-height:1.5}
.import-preview .preview-count b{font-size:14px;color:var(--text);font-variant-numeric:tabular-nums}.preview-warning{color:var(--negative)}
.imported-deck{margin-top:21px;padding:17px 17px 16px;border:1px solid var(--edge);background:linear-gradient(142deg,var(--panel-tint),var(--panel));border-radius:15px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.imported-deck>div{display:flex;flex-direction:column;gap:5px;min-width:0}.imported-deck strong{font-size:17px;font-weight:660;letter-spacing:-.04em}.imported-deck small{font-size:12px;color:var(--muted);line-height:1.55}
.deck-overline{font-weight:690;letter-spacing:.17em;font-size:10px;color:var(--muted);display:block;text-transform:uppercase}
.studio-deck{border:1px solid var(--v4-line);border-radius:17px;background:linear-gradient(130deg,var(--panel-tint),var(--panel));padding:22px 23px 21px;margin:21px 0 22px}
.studio-deck-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:17px}
.studio-deck-head h3{margin:7px 0 5px;font-size:20px;line-height:1.23;letter-spacing:-.045em;font-weight:660}.studio-deck-head p{font-size:12px;color:var(--muted);margin:0;line-height:1.75}
.studio-deck .btn{white-space:nowrap;min-height:40px;padding:0 13px;font-size:12px}
.deck-preview{display:flex;align-items:center;gap:7px;flex-wrap:wrap;max-height:158px;overflow:auto;overscroll-behavior:contain;padding:1px 0 3px}
.deck-word{display:inline-flex;align-items:center;gap:7px;min-height:30px;border:1px solid var(--v4-line);background:var(--panel);border-radius:9px;padding:5px 9px;color:var(--text);font-size:12px;font-weight:600}
.deck-word-meaning{font-weight:400;color:var(--muted);font-size:11px;max-width:155px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.deck-empty{padding:15px 16px;background:var(--panel);border:1px dashed var(--edge);border-radius:12px;color:var(--muted);font-size:12px;line-height:1.7}
.ai-card{border-radius:21px}.ai-heading strong{font-size:18px;letter-spacing:-.03em}.ai-heading small{font-size:12.5px;line-height:1.65}.ai-word-count{border-bottom:0}
.ai-provider{border-radius:16px}.ai-provider strong{font-size:14px}.ai-provider small{font-size:11.5px;line-height:1.6}
.ai-provider.selected{outline:1px solid rgba(84,119,193,.22);outline-offset:-1px}
.ai-connection{border-radius:16px}.ai-connection-head p{font-size:12.5px}.ai-disclaimer{line-height:1.75}
/* Reading is a text-first workspace. The glass layer never goes behind long paragraphs. */
.reading-article,.reading-test{background:var(--panel);box-shadow:var(--v4-elevation)}
.reading-article h2{letter-spacing:-.048em;line-height:1.25}
.reading-text{font-size:clamp(17.5px,1.55vw,19px);line-height:2.05;letter-spacing:.002em;word-spacing:.016em;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text",Georgia,serif}
.reading-text .word-token{border-bottom:1px solid transparent;border-radius:3px}
.reading-text .word-token:hover{border-bottom-color:var(--accent)}
.word-token.word-from-deck{color:var(--v4-accent);border-bottom:1px dotted currentColor;background:rgba(89,125,187,.065);font-weight:625;padding:0 2px}
.word-token.word-from-deck:hover,.word-token.word-from-deck:focus-visible{background:var(--accent-soft)}
.reading-trace{margin:27px 0 7px;padding:18px 19px;border:1px solid var(--v4-line);border-radius:15px;background:linear-gradient(125deg,var(--panel-tint),var(--panel))}
.reading-trace-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.reading-trace h3{font-size:15px;letter-spacing:-.035em;font-weight:650;margin:7px 0 6px}.reading-trace p{font-size:12px;color:var(--muted);line-height:1.75;margin:0}.reading-trace .btn{flex-shrink:0;font-size:12px;padding:0 8px}
.trace-words{display:flex;gap:7px;flex-wrap:wrap;border-top:1px solid var(--v4-line);padding-top:14px;margin-top:15px}
.trace-chip{border:1px solid var(--edge);border-radius:8px;background:var(--panel);color:var(--text);padding:8px 11px;min-height:36px;font-size:12px;font-weight:585}
.trace-chip:hover{border-color:var(--accent)}.trace-chip.is-uncertain{background:var(--accent-soft);color:var(--accent)}
.trace-summary{font-size:11px;color:var(--muted);margin-top:11px}
.reading-question{scroll-margin-top:105px}.reading-choice{min-height:44px;align-items:center}.reading-choice:has(input:checked){border-color:rgba(81,111,186,.35);background:var(--accent-soft)}
.reading-results{display:flex;flex-direction:column;gap:6px;padding:17px 19px!important;line-height:1.55;border-radius:13px!important}
.reading-results strong{font-size:15px}.reading-results span{font-size:12px;opacity:.91}
.reading-evidence{display:flex;flex-direction:column;gap:6px;border-left:2px solid var(--accent);padding:8px 0 8px 12px;margin-top:14px;background:var(--panel-tint);border-radius:0 8px 8px 0}
.reading-evidence span{font-size:10px;font-weight:700;color:var(--muted);letter-spacing:.1em}.reading-evidence em{font-size:13px;line-height:1.7;font-style:normal;color:var(--text)}
.lookup-layer .modal{box-shadow:0 24px 64px rgba(20,23,37,.2),0 3px 14px rgba(20,23,37,.05)}
.lookup-signal{display:flex;gap:8px;margin-top:15px;flex-wrap:wrap}
.signal-button{min-height:40px;border:1px solid var(--edge);border-radius:11px;padding:8px 12px;background:var(--panel-tint);color:var(--text);display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:12px;font-weight:620;line-height:1.35}
.signal-button:first-child{background:var(--accent-soft);color:var(--accent);border-color:transparent}
.signal-button:hover{box-shadow:0 4px 12px rgba(32,42,64,.06)}
.review-word-signal{margin:22px 0;padding:22px 23px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.review-word-signal>div:first-child{flex:1 1 230px}.review-word-signal h2{font-size:17px;letter-spacing:-.038em;margin:6px 0 5px}.review-word-signal p{font-size:12px;color:var(--muted);line-height:1.7;margin:0}
.review-mini-words{flex:1 1 190px;display:flex;flex-wrap:wrap;gap:6px}.review-mini-words span{border:1px solid var(--v4-line);background:var(--panel-tint);border-radius:7px;padding:6px 9px;font-size:12px}.review-mini-words .empty-note{background:transparent;color:var(--muted)}
#main.page-enter{animation:v4-enter .28s var(--v4-ease) both}@keyframes v4-enter{from{opacity:.7;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}
@media(hover:hover) and (pointer:fine){.deck-word:hover{border-color:rgba(72,116,191,.23)}.quick-card:hover{transform:translateY(-2px)}.sidebar .side-link:hover{transform:translateX(2px)}}
@media(max-width:1120px){.studio-deck-head{align-items:flex-start}.studio-deck-head .btn-row{justify-content:flex-end}}
@media(max-width:900px){.studio-deck{padding:18px}.studio-deck-head{flex-wrap:wrap}.studio-deck-head .btn-row{justify-content:start}.reading-text{font-size:18px}.imported-deck{flex-wrap:wrap}}
@media(max-width:620px){
 .topbar{padding:0 19px}.top-actions{gap:5px}.breadcrumbs{font-size:11.5px}
 #main{padding-top:31px}.page-title{font-size:33px}.hero-title{font-size:45px}
 .sidebar{display:none}.mobile-link{min-height:49px;font-size:10.5px;gap:5px}.mobile-link svg{width:21px;height:21px}
 .mobile-nav{background:var(--glass);-webkit-backdrop-filter:blur(16px) saturate(1.2);backdrop-filter:blur(16px) saturate(1.2)}
 .session-panel{padding:27px}.hero-deck-link{max-width:100%;font-size:11.5px;flex-wrap:wrap}
 .quick-card strong{font-size:14px}.quick-card small{font-size:11.5px}
 .studio-deck{padding:16px;margin:17px 0}.studio-deck-head h3{font-size:18px}.studio-deck-head .btn-row{width:100%}.studio-deck-head .btn{flex:1}
 .deck-preview{max-height:166px}.deck-word{min-height:33px}.deck-word-meaning{max-width:102px}
 .imported-deck{padding:15px}.imported-deck>.btn{width:100%}
 .reading-trace{padding:14px}.reading-trace-top{flex-wrap:wrap}.reading-trace .btn{min-height:37px}
 .reading-text{font-size:17.5px;line-height:1.95}.reading-results{padding:14px!important}
 .lookup-signal{flex-direction:column}.signal-button{min-height:44px;width:100%}
 .review-word-signal{padding:17px}
}
@media(max-width:380px){.deck-word-meaning{max-width:85px}.reading-text{font-size:17px}.mobile-link{font-size:10px}.page-title{font-size:30px}}
@media(prefers-reduced-motion:reduce){#main.page-enter{animation:none!important}button:not(:disabled),.quick-card,.word-token{transition:none!important}}
@supports not ((-webkit-backdrop-filter:blur(1px)) or (backdrop-filter:blur(1px))){.topbar,.mobile-nav{background:var(--panel)}.lookup-layer .modal{background:var(--panel)}}
/* V4 Reading Focus Mode. A calm editorial canvas, not a separate application. */
.focus-reader-button{border-color:var(--v4-line);font-weight:645}
.reading-immersive .sidebar,.reading-immersive .topbar,.reading-immersive .workspace-foot,
.reading-immersive .mobile-nav,.reading-immersive .reading-library,.reading-immersive .reading-test,
.reading-immersive .reading-ai-cta,.reading-immersive #main > .top-intro,
.reading-immersive #main > .section-label{display:none!important}
.reading-immersive .app-shell{max-width:none}
.reading-immersive .workspace{width:100%;min-width:0}
.reading-immersive #main{max-width:930px;padding:clamp(22px,3vw,46px) clamp(16px,3vw,40px) 80px}
.reading-immersive .reading-layout{display:block;max-width:none;margin:0}
.reading-immersive .reading-article{padding:clamp(24px,5vw,62px);border-radius:24px;box-shadow:0 25px 90px rgba(28,33,48,.09),0 4px 16px rgba(27,29,37,.04)}
.reading-immersive .reading-article > .btn-row{justify-content:center;margin-bottom:26px}
.reading-immersive .reading-article h2{text-align:center;font-size:clamp(29px,4vw,48px);line-height:1.17;max-width:690px;margin:0 auto 37px;letter-spacing:-.065em}
.reading-immersive .reading-text{font-size:clamp(19px,2.25vw,22px);line-height:2.25;letter-spacing:.002em;max-width:68ch;margin:0 auto;word-spacing:.026em}
.reading-immersive .reading-trace{max-width:68ch;margin:38px auto 22px}
.reading-immersive .reading-controls{max-width:68ch;margin:26px auto 0;justify-content:center;gap:10px;flex-wrap:wrap}
.reading-immersive .reading-translation{max-width:68ch;margin:26px auto 0;line-height:2.1}
.reading-immersive .reading-article::before{content:"READING / ELRIC STUDIOS";display:block;text-align:center;letter-spacing:.28em;font-weight:680;font-size:10px;color:var(--muted);margin-bottom:26px}
@media(max-width:620px){.reading-immersive #main{padding:12px 0 40px}.reading-immersive .reading-article{padding:24px 21px;border-radius:0;border-left:0;border-right:0}.reading-immersive .reading-article h2{font-size:31px;margin-bottom:23px}.reading-immersive .reading-text{font-size:18.5px;line-height:2.1}.reading-immersive .reading-controls .btn{flex:1 1 130px}}
.reading-article>.btn-row{align-items:center}.reading-article>.btn-row .focus-reader-button{margin-left:auto;min-height:36px;padding:0 11px;font-size:12px;white-space:nowrap}
.reading-immersive .reading-article>.btn-row{justify-content:center;gap:10px;margin-bottom:26px}
.reading-immersive .reading-article>.btn-row .focus-reader-button{margin-left:0}
@media(max-width:620px){.reading-article>.btn-row{gap:7px}.reading-article>.btn-row .pill{padding:5px 8px}.reading-article>.btn-row .focus-reader-button{min-height:34px;padding:0 8px;font-size:11.5px}}
.recovery-panel{max-width:720px;margin:14vh auto 10vh;padding:clamp(25px,4vw,50px)}
.recovery-panel h2{font-size:clamp(26px,3vw,38px);letter-spacing:-.055em;margin:14px 0}
.recovery-panel p{font-size:14px;color:var(--muted);line-height:1.9;margin:0 0 26px}
.preview-warning{margin:22px 0;border:1px solid rgba(178,133,69,.25);background:rgba(194,149,73,.075);color:var(--text)}