:root{--ink:#171714;--paper:#f4f1e9;--white:#fffdf8;--muted:#706d64;--line:#d7d2c7;--yellow:#f2c84b;--green:#73977a;--red:#d77967;--shadow:0 18px 50px rgba(28,27,22,.08);--radius:22px}*{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(circle at 10% 0%,rgba(242,200,75,.12),transparent 32rem),var(--paper);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans","Yu Gothic UI","Yu Gothic",sans-serif;line-height:1.7}button,textarea,input{font:inherit}button{color:inherit}button:focus-visible,textarea:focus-visible,input:focus-visible,label:has(input:focus-visible){outline:3px solid rgba(23,23,20,.28);outline-offset:3px}.app-shell{width:min(1180px,calc(100% - 32px));margin:0 auto;min-height:100svh}.topbar{display:flex;align-items:center;justify-content:space-between;padding:28px 0 18px;gap:20px}.brand{display:flex;align-items:center;gap:13px}.brand-mark{display:grid;place-items:center;width:50px;height:50px;border-radius:16px;background:var(--ink);color:var(--paper);font-size:22px;font-weight:800;transform:none}.brand h1{margin:0;font-size:clamp(18px,2.3vw,26px);letter-spacing:.11em;line-height:1.15}.brand p{margin:4px 0 0;color:var(--muted);font-size:13px}.tabs{display:flex;gap:5px;padding:5px;background:rgba(255,255,255,.55);border:1px solid var(--line);border-radius:16px;margin-bottom:24px;overflow-x:auto}.tab{border:0;background:transparent;padding:11px 18px;border-radius:11px;white-space:nowrap;cursor:pointer;font-weight:700;color:var(--muted)}.tab.is-active{background:var(--ink);color:var(--white)}.count{display:inline-grid;place-items:center;min-width:20px;height:20px;padding:0 5px;border-radius:20px;background:rgba(255,255,255,.18);font-size:11px}.view{display:none}.view.is-active{display:block;animation:rise .32s ease-out}@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.hero-grid{display:grid;grid-template-columns:minmax(0,1.75fr) minmax(260px,.75fr);gap:22px}.card,.result-card,.kanji-section,.quiz-card{background:rgba(255,253,248,.88);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.input-panel{padding:clamp(20px,4vw,38px)}.section-heading,.result-header,.page-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.section-heading h2,.result-header h2,.page-heading h2{margin:4px 0 0;font-size:clamp(22px,4vw,34px);line-height:1.35;letter-spacing:-.025em}.eyebrow{color:var(--muted);font-size:11px;font-weight:900;letter-spacing:.18em}textarea{display:block;width:100%;min-height:210px;resize:vertical;margin-top:24px;padding:22px;border:1px solid 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span{display:block;width:1px;height:100%;background:var(--ink);position:relative}.bridge-line span::after{content:"";position:absolute;bottom:-1px;left:-4px;width:7px;height:7px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink);transform:rotate(45deg)}.language-pair{display:grid;grid-template-columns:1fr 1fr;gap:9px}.language-pair .language-block{padding:18px}.language-pair .language-block>span{margin-bottom:18px}.language-pair strong{font-size:18px}.status-panel{display:flex;align-items:center;gap:18px;margin-top:20px;padding:20px 24px;background:var(--ink);color:var(--white);border-radius:18px}.status-panel p{margin:1px 0 0;color:#c8c6bd;font-size:13px}.loader{width:28px;height:28px;border:3px solid rgba(255,255,255,.2);border-top-color:var(--yellow);border-radius:50%;animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.result-panel{margin-top:38px}.result-header{align-items:end;margin-bottom:16px}.result-actions,.heading-actions,.card-tools{display:flex;gap:8px;align-items:center}.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.result-card{padding:24px;min-height:240px}.result-card header{display:flex;justify-content:space-between;align-items:center;gap:15px;padding-bottom:17px;border-bottom:1px solid var(--line)}.result-card header>div:first-child{display:flex;align-items:center;gap:10px}.result-card h3{margin:0;font-size:15px}.lang-tag{display:inline-grid;place-items:center;min-width:34px;height:25px;padding:0 8px;border-radius:20px;background:var(--ink);color:var(--white);font-size:10px;font-weight:900}.main-output{margin:22px 0 0;font-size:clamp(18px,2.5vw,25px);line-height:1.85}.japanese-card{background:#fff8dc;grid-column:1/-1}ruby rt{color:var(--muted);font-size:.48em;font-weight:500}.no-furigana rt{visibility:hidden}.reading-box{margin-top:18px;padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.55)}.reading-box span,.expression-step span{color:var(--muted);font-size:10px;font-weight:900;letter-spacing:.12em}.reading-box p{margin:2px 0 0;font-size:13px}.explanation-card{grid-column:1/-1;min-height:0}.expression-step{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:center;margin-top:18px}.expression-step>div{padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--white)}.expression-step p{margin:5px 0 0;font-size:17px;font-weight:750}.step-arrow{font-size:24px!important;color:var(--ink)!important}.teacher-note{margin:14px 2px 0;color:var(--muted);font-size:13px}.kanji-section{margin-top:14px;padding:26px}.small-note{color:var(--muted);font-size:11px}.kanji-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px}.kanji-card{position:relative;min-height:190px;perspective:800px;cursor:pointer;border:0;background:transparent;padding:0;text-align:left}.kanji-card-inner{position:absolute;inset:0;transition:transform .5s;transform-style:preserve-3d}.kanji-card.is-flipped .kanji-card-inner{transform:rotateY(180deg)}.kanji-face{position:absolute;inset:0;backface-visibility:hidden;display:flex;flex-direction:column;justify-content:space-between;padding:18px;border:1px solid var(--line);border-radius:16px;background:var(--white)}.kanji-front strong{font-size:clamp(36px,6vw,56px);line-height:1}.kanji-front small{color:var(--muted)}.kanji-back{transform:rotateY(180deg);background:var(--ink);color:var(--white)}.kanji-back strong{font-size:19px}.kanji-back p{margin:4px 0 0;color:#cfcdc5;font-size:12px;line-height:1.5;white-space:pre-line}.kanji-example{padding-top:10px;border-top:1px solid rgba(255,255,255,.18)}.page-heading{align-items:end;margin:18px 0 22px}.page-heading p{margin:6px 0 0;color:var(--muted)}.file-label{display:inline-block;cursor:pointer}.empty-state{padding:70px 22px;text-align:center;border:1px dashed #b9b4a9;border-radius:var(--radius)}.empty-state>span{display:inline-grid;place-items:center;width:78px;height:78px;border-radius:25px;background:#e6e1d6;font-size:28px;font-weight:800;transform:none}.empty-state h3{margin:18px 0 3px}.empty-state p{margin:0;color:var(--muted)}.library-list{display:grid;gap:12px}.library-item{display:grid;grid-template-columns:54px minmax(0,1fr) auto;gap:16px;align-items:center;padding:17px;border:1px solid var(--line);border-radius:17px;background:rgba(255,253,248,.8)}.library-number{display:grid;place-items:center;width:54px;height:54px;border-radius:15px;background:var(--yellow);font-weight:900}.library-copy h3{margin:0;font-size:17px;line-height:1.45}.library-copy p{margin:5px 0 0;color:var(--muted);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.library-actions{display:flex;gap:7px}.delete-button{background:transparent;color:#9e4636;border:1px solid #dcb8af;border-radius:10px;padding:8px 10px;cursor:pointer}.quiz-card{max-width:760px;margin:0 auto;padding:clamp(24px,6vw,55px)}.quiz-progress{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;font-weight:800}.quiz-prompt{margin:28px 0;text-align:center;font-size:clamp(30px,8vw,64px);font-weight:850;line-height:1.35}.quiz-choices{display:grid;grid-template-columns:1fr 1fr;gap:10px}.quiz-choice{padding:17px;border:1px solid var(--line);border-radius:14px;background:var(--white);cursor:pointer;font-weight:750;text-align:left}.quiz-choice:hover{border-color:var(--ink)}.quiz-choice.correct{background:#dcebdd;border-color:var(--green)}.quiz-choice.wrong{background:#f2dcd7;border-color:var(--red)}.quiz-choice:disabled{cursor:default}.quiz-feedback{min-height:28px;margin:17px 0 0;text-align:center;font-weight:800}footer{padding:45px 0 34px;color:var(--muted);font-size:12px;text-align:center}footer span{padding:0 7px}dialog{width:min(430px,calc(100% - 32px));border:0;border-radius:20px;padding:0;background:var(--white);box-shadow:0 25px 80px rgba(0,0,0,.22)}dialog::backdrop{background:rgba(23,23,20,.48);backdrop-filter:blur(3px)}.dialog-inner{padding:28px}.dialog-inner h2{margin:0}.dialog-inner p{color:var(--muted);white-space:pre-line}.dialog-inner .primary-button{width:100%;min-width:0;justify-content:center;margin-top:20px}@media(max-width:850px){.hero-grid{grid-template-columns:1fr}.concept-panel{display:grid;grid-template-columns:1.2fr auto 1fr;align-items:stretch}.bridge-line{width:50px;height:auto}.bridge-line span{width:100%;height:1px;align-self:center}.bridge-line span::after{right:0;left:auto;bottom:-3px;transform:rotate(-45deg)}.level-options,.kanji-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:620px){.app-shell{width:min(100% - 20px,1180px)}.topbar{align-items:flex-start;padding-top:18px}.brand-mark{width:44px;height:44px}.brand p{display:none}.tabs{margin-bottom:15px}.tab{padding:10px 12px;font-size:13px}.input-panel{padding:18px}textarea{min-height:180px;padding:16px}.level-options{grid-template-columns:1fr 1fr}.level-options span{min-height:72px;padding:10px}.action-row{align-items:stretch;flex-direction:column}.primary-button{width:100%;min-width:0}.concept-panel{grid-template-columns:1fr}.bridge-line{width:auto;height:40px}.bridge-line span{width:1px;height:100%}.bridge-line span::after{left:-4px;right:auto;bottom:-1px;transform:rotate(45deg)}.language-pair{grid-template-columns:1fr 1fr}.result-header,.page-heading{flex-direction:column;align-items:stretch}.result-actions,.heading-actions{justify-content:flex-start;flex-wrap:wrap}.result-grid{grid-template-columns:1fr}.japanese-card,.explanation-card{grid-column:auto}.expression-step{grid-template-columns:1fr}.step-arrow{transform:rotate(90deg);justify-self:center}.kanji-section{padding:18px}.kanji-grid{grid-template-columns:1fr 1fr}.kanji-card{min-height:175px}.library-item{grid-template-columns:44px minmax(0,1fr)}.library-number{width:44px;height:44px}.library-actions{grid-column:2}.quiz-choices{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation-duration:.001ms!important;transition-duration:.001ms!important}}

/* OCR and exact-furigana additions */
.ocr-panel{margin-top:14px;padding:16px;border:1px solid var(--line);border-radius:16px;background:rgba(255,253,248,.72)}
.ocr-heading{display:flex;align-items:center;justify-content:space-between;gap:14px}
.ocr-heading h3{margin:2px 0 0;font-size:15px}
.ocr-actions{display:flex;gap:7px;flex-wrap:wrap;justify-content:flex-end}
.ocr-preview{display:grid;grid-template-columns:92px minmax(0,1fr) auto;align-items:center;gap:13px;margin-top:13px;padding:10px;border-radius:13px;background:#ebe7dc}
.ocr-preview img{display:block;width:92px;height:74px;object-fit:cover;border-radius:10px;background:#d8d3c8}
.ocr-preview-copy{min-width:0}
.ocr-preview-copy strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px}
.ocr-preview-copy p{margin:3px 0 0;color:var(--muted);font-size:11px;line-height:1.5}
.ocr-controls{display:flex;align-items:center;gap:14px;margin-top:12px;flex-wrap:wrap}
.ocr-controls .secondary-button{padding:10px 14px}
.check-option{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;font-weight:700;cursor:pointer}
.check-option input{width:17px;height:17px;accent-color:var(--ink)}
.strong-secondary{background:#fff8dc}
.furigana-only-panel{max-width:1000px;margin-inline:auto}
.original-card{grid-column:auto;min-height:0}
.original-card .main-output{font-size:clamp(19px,2.7vw,27px)}
.preserve-lines{white-space:pre-wrap;overflow-wrap:anywhere}
.original-note{margin:15px 2px 0;color:var(--muted);font-size:12px}
body[aria-busy="true"] .file-label{pointer-events:none;opacity:.55}
@media(max-width:620px){
  .ocr-heading{align-items:flex-start;flex-direction:column}
  .ocr-actions{justify-content:flex-start;width:100%}
  .ocr-preview{grid-template-columns:72px minmax(0,1fr)}
  .ocr-preview img{width:72px;height:68px}
  .ocr-preview .delete-button{grid-column:2;justify-self:start}
  .ocr-controls{align-items:stretch;flex-direction:column}
  .ocr-controls .secondary-button{width:100%}
}