/* Polyglot AI 5.6 — interaction QA, modal scroll isolation, readable CJK */
:root{--v56-safe-top:env(safe-area-inset-top,0px);--v56-safe-right:env(safe-area-inset-right,0px);--v56-safe-bottom:env(safe-area-inset-bottom,0px);--v56-safe-left:env(safe-area-inset-left,0px);--v56-cjk:"Noto Sans CJK SC","Noto Sans CJK JP","Noto Sans CJK KR","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Yu Gothic",system-ui,sans-serif}

/* Desktop: restore richer hierarchy without returning to clutter */
@media(min-width:981px){
  .app-body{grid-template-columns:248px minmax(0,1fr)!important;gap:24px!important;padding:22px 26px 34px!important}
  .v54-desktop-nav{width:248px!important;padding:18px 14px!important;border-radius:24px!important;background:linear-gradient(180deg,rgba(24,35,63,.96),rgba(12,20,39,.95))!important;box-shadow:0 24px 70px rgba(0,0,0,.28)!important}
  .v54-desktop-nav>button{min-height:58px!important;padding:10px 12px!important;border-radius:16px!important;margin-bottom:6px!important}
  .v54-desktop-nav>button span:nth-child(2) b{font-size:14px!important}.v54-desktop-nav>button span:nth-child(2) small{font-size:10px!important;display:block!important;margin-top:3px!important}
  .page-section{max-width:1420px!important;padding:4px 2px 70px!important}
  .v55-function-page{gap:18px!important;max-width:1400px!important}
  .v55-function-hero{padding:26px 28px!important;border-radius:28px!important;background:radial-gradient(circle at 86% 0,rgba(56,189,248,.13),transparent 34%),linear-gradient(145deg,rgba(109,94,252,.20),rgba(255,255,255,.052))!important}
  .v55-title h1{font-size:clamp(36px,3.3vw,52px)!important}.v55-title p{font-size:15px!important;max-width:780px!important}
  .v55-fact{min-height:94px!important;padding:16px!important}.v55-fact b{font-size:15px!important}.v55-fact small{font-size:10px!important}
  .v55-method{padding:17px 20px!important;border-radius:20px!important}.v55-step i{width:31px!important;height:31px!important}.v55-step b{font-size:12px!important}
  .v55-function-page :is(.vocab-pack-grid,.skill-unit-grid,.unit-grid,.dashboard-skill-grid){grid-template-columns:repeat(2,minmax(0,1fr))!important;gap:16px!important}
  .v55-function-page :is(.vocab-pack-card,.skill-unit-card,.unit-card,.review-card){padding:20px!important;border-radius:22px!important}
  .v55-function-page:not(.v55-show-advanced) .vocab-session-guide{display:block!important}
}

/* Clear button states and interaction feedback */
button:not(:disabled){cursor:pointer!important}
button:disabled{cursor:not-allowed!important;opacity:.52!important}
button.v56-clicking{transform:scale(.985)!important;filter:brightness(1.12)!important}
.v56-toast{position:fixed;left:50%;bottom:calc(24px + var(--v56-safe-bottom));z-index:7000;transform:translate(-50%,16px);opacity:0;pointer-events:none;background:#101a30;color:#fff;border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:11px 15px;box-shadow:0 18px 55px rgba(0,0,0,.45);font-size:12px;font-weight:700;transition:.2s}
.v56-toast.show{opacity:1;transform:translate(-50%,0)}

/* CJK and pronunciation */
.remember-word-stage h1,.flashcard-face h2,.write-correction-box h2,.character-main h1,.character-main .character-glyph,.vocab-word-preview b,.v56-cjk-word{font-family:var(--v56-cjk)!important;font-synthesis:none!important;text-rendering:geometricPrecision!important;-webkit-font-smoothing:antialiased!important}
.remember-word-stage h1{font-size:clamp(48px,6vw,76px)!important;line-height:1.18!important;font-weight:650!important;letter-spacing:.01em!important;margin:12px 0 5px!important}
.remember-word-stage h3,.v56-pronunciation-main{font-family:var(--v56-cjk)!important;font-size:20px!important;line-height:1.45!important;color:#c8bfff!important;margin:0!important;font-weight:600!important}
.remember-word-stage>small,.v56-pronunciation-latin{font-size:14px!important;color:#93c5fd!important;letter-spacing:.025em!important;margin-top:3px!important}
.v56-pronunciation{display:flex;flex-direction:column;align-items:center;gap:2px;margin:0 0 16px;padding:7px 14px;border-radius:13px;background:rgba(124,92,255,.08);border:1px solid rgba(167,139,250,.16)}
.v56-pronunciation-label{font-size:9px!important;color:#8fa4c7!important;letter-spacing:.12em!important;text-transform:uppercase!important}
.flashcard-face h2{font-size:clamp(44px,5vw,68px)!important;line-height:1.2!important}.reading-stack b{font-family:var(--v56-cjk)!important;font-size:20px!important}.reading-stack span{font-size:14px!important}
.vocab-word-preview span{display:flex!important;flex-direction:column!important;align-items:flex-start!important;gap:1px!important}.vocab-word-preview b{font-size:17px!important;line-height:1.4!important}.vocab-word-preview small{font-size:11px!important;color:#aebed8!important}

/* Mobile lesson session becomes the only scroll container */
@media(max-width:980px){
  body.v56-learning-open{overflow:hidden!important;overscroll-behavior:none!important;touch-action:none!important;width:100%!important}
  body.v56-learning-open .topbar,body.v56-learning-open .v54-mobile-nav,body.v56-learning-open .v53-mobile-nav,body.v56-learning-open .v503-mobile-dock{visibility:hidden!important;pointer-events:none!important}
  .vocab-lab-page.v56-active-session{position:fixed!important;z-index:5600!important;inset:var(--v56-safe-top) var(--v56-safe-right) var(--v56-safe-bottom) var(--v56-safe-left)!important;width:auto!important;max-width:none!important;height:auto!important;overflow-y:auto!important;overflow-x:hidden!important;-webkit-overflow-scrolling:touch!important;overscroll-behavior:contain!important;touch-action:pan-y!important;background:linear-gradient(180deg,#111d37,#0b1428)!important;padding:10px 10px 28px!important;margin:0!important;scrollbar-width:none!important}
  .vocab-lab-page.v56-active-session::-webkit-scrollbar{display:none!important}
  .vocab-lab-page.v56-active-session .vocab-session-top{position:sticky!important;top:0!important;z-index:5!important;margin:-10px -10px 10px!important;padding:10px!important;background:rgba(12,21,40,.96)!important;backdrop-filter:blur(15px)!important}
  .vocab-lab-page.v56-active-session .vocab-session-layout{display:flex!important;flex-direction:column!important;min-height:auto!important;overflow:visible!important;gap:10px!important}
  .vocab-lab-page.v56-active-session .vocab-practice-card{min-height:auto!important;height:auto!important;padding:14px 12px 18px!important;border-radius:19px!important;overflow:visible!important}
  .vocab-lab-page.v56-active-session .remember-word-stage{min-height:auto!important;padding:12px 4px!important}
  .vocab-lab-page.v56-active-session .vocab-session-guide{display:block!important;padding:13px!important;max-height:none!important}
  .vocab-lab-page.v56-active-session .remember-rating-row{position:sticky!important;bottom:0!important;z-index:4!important;padding:8px 0 calc(6px + var(--v56-safe-bottom))!important;background:linear-gradient(180deg,transparent,rgba(11,20,40,.98) 25%)!important}
  .vocab-lab-page.v56-active-session .remember-rating-row button{min-height:60px!important;padding:9px 7px!important}
  .remember-word-stage h1{font-size:clamp(43px,14vw,62px)!important;line-height:1.22!important;margin-top:9px!important}
  .remember-word-stage h3,.v56-pronunciation-main{font-size:19px!important}.remember-word-stage>small,.v56-pronunciation-latin{font-size:14px!important}
  .flashcard-face h2{font-size:clamp(42px,13vw,58px)!important}.reading-stack b{font-size:19px!important}
  .vocab-pack-card{padding:15px!important}.vocab-word-preview{gap:7px!important}.vocab-word-preview b{font-size:18px!important}.vocab-word-preview small{font-size:12px!important}
  .v55-function-hero{padding:15px!important}.v55-title h1{font-size:29px!important}.v55-title p{font-size:13px!important;line-height:1.65!important}
  .v55-fact b{font-size:12px!important}.v55-step b{font-size:10px!important}
  .v56-toast{left:10px;right:10px;bottom:calc(76px + var(--v56-safe-bottom));transform:translateY(16px);text-align:center}.v56-toast.show{transform:translateY(0)}
}