:root{--bg: #f8f6f2;--surface: #ffffff;--text: #1b4332;--text-muted: #52796f;--accent: #2d6a4f;--accent-light: #d8f3dc;--accent-warm: #e76f51;--accent-warm-light: #ffe8e0;--border: #b7c9c2;--success: #40916c;--error: #c1121f;--radius: 14px;--font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;--shadow: 0 2px 12px rgba(27, 67, 50, .08);--safe-top: env(safe-area-inset-top, 0px);--safe-right: env(safe-area-inset-right, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-left: env(safe-area-inset-left, 0px);--page-pad-x: max(1rem, var(--safe-left), var(--safe-right));--fab-clearance: calc(5.5rem + var(--safe-bottom))}*,*:before,*:after{box-sizing:border-box}html{font-size:16px;-webkit-text-size-adjust:100%;overflow-x:hidden}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.55;min-height:100dvh;overflow-x:hidden}#root{min-height:100dvh;overflow-x:hidden}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;cursor:pointer}.app-shell{max-width:720px;margin:0 auto;padding:max(.75rem,var(--safe-top)) var(--page-pad-x) calc(4.75rem + var(--safe-bottom));width:100%}.app-shell--subpage{padding-bottom:var(--fab-clearance)}.app-header{display:flex;flex-direction:column;align-items:stretch;gap:.75rem;margin-bottom:1.25rem;padding-bottom:.85rem;border-bottom:2px solid var(--accent-light)}.app-header-brand{display:flex;align-items:center;gap:.65rem;min-width:0}.app-header-icon{flex-shrink:0;border-radius:12px;object-fit:cover}.app-header-tagline{margin:.15rem 0 0;font-size:.85rem}.app-header h1{margin:0;font-size:1.2rem;font-weight:700;letter-spacing:-.02em;line-height:1.25}.app-header-nav{display:flex;align-items:center;flex-wrap:wrap;gap:.45rem}.home-back-header-btn{display:flex;align-items:center;gap:.65rem;padding:.45rem .85rem .45rem .45rem;border-radius:12px;border:2px solid var(--accent);background:var(--accent-light);text-decoration:none;color:inherit;transition:background .12s,transform .12s;max-width:100%}.home-back-header-btn:hover{background:#c7f0d8;text-decoration:none;transform:translateY(-1px)}.home-back-header-icon{flex-shrink:0;border-radius:10px;object-fit:cover}.home-back-header-text{display:flex;flex-direction:column;gap:.05rem;min-width:0}.home-back-header-label{font-weight:700;font-size:1rem;color:var(--accent)}.home-back-header-sub{font-size:.72rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.home-back-fab{position:fixed;left:50%;bottom:calc(.85rem + var(--safe-bottom));transform:translate(-50%);z-index:900;display:inline-flex;align-items:center;gap:.5rem;max-width:calc(100vw - 2rem - var(--safe-left) - var(--safe-right));padding:.7rem 1.25rem;border-radius:999px;background:var(--accent);color:#fff;font-weight:700;font-size:.95rem;text-decoration:none;box-shadow:0 4px 20px #2d6a4f59;border:2px solid #fff;transition:transform .12s,background .12s;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.home-back-fab:hover{background:#1b4332;text-decoration:none;color:#fff;transform:translate(-50%) translateY(-2px)}.home-back-fab-icon{border-radius:8px;object-fit:cover}.home-hero{background:linear-gradient(135deg,#ffe8ef,#fff5f8 45%,#fff);border-color:#f4a6c0;box-shadow:0 4px 18px #e8789c1f}.home-hero-lead{margin:0;font-size:1.15rem;color:#7a2e4a}.home-hero-desc{margin:.75rem 0 0;padding:.9rem 1rem;font-size:clamp(.98rem,3.6vw,1.15rem);font-weight:700;line-height:1.75;color:#7a2e4a;text-align:center;letter-spacing:.02em;background:#ffffffb8;border:2px solid rgba(244,166,192,.85);border-radius:12px;box-shadow:inset 0 1px #ffffffe6}.home-hero-desc-line{display:block}.home-hero-hint{margin:.65rem 0 0;font-size:.85rem;line-height:1.5;color:#9d5a72}.home-hero-hint strong{color:#7a2e4a}.home-quick-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.55rem;margin-bottom:1rem}.home-quick-link{display:flex;flex-direction:column;gap:.15rem;padding:.75rem .85rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);text-decoration:none;color:inherit;transition:border-color .12s,background .12s}.home-quick-link:hover{border-color:var(--accent);background:var(--accent-light);text-decoration:none}.home-quick-link--accent{border-color:var(--accent);background:var(--accent-light)}.home-quick-link-label{font-weight:700;font-size:.95rem;color:var(--accent)}.home-quick-link-desc{font-size:.78rem}.word-progress-pct{font-size:1.1rem;font-weight:700;color:var(--accent)}.word-progress-count{margin:.45rem 0 0;font-weight:600;font-size:.95rem}.progress-bar--lg{height:10px;margin-top:.75rem}.home-footer-note{margin-top:1.5rem;font-size:.82rem;display:flex;flex-wrap:wrap;align-items:center;gap:.35rem}.btn-sm{padding:.3rem .6rem;font-size:.8rem}.streak-badge{background:var(--accent-warm-light);color:var(--accent-warm);padding:.35rem .65rem;border-radius:999px;font-size:.85rem;font-weight:600;white-space:nowrap}.card{background:var(--surface);border-radius:var(--radius);padding:1.15rem 1.25rem;box-shadow:var(--shadow);border:1px solid var(--border);margin-bottom:1rem}.card h2{margin:0 0 .5rem;font-size:1.15rem}.card h3{margin:1rem 0 .35rem;font-size:1rem;color:var(--accent)}.muted{color:var(--text-muted);font-size:.92rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;padding:.65rem 1.1rem;min-height:44px;border-radius:10px;border:none;font-weight:600;font-size:.95rem;transition:transform .12s ease,opacity .12s;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.btn:active{transform:scale(.98)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:disabled{opacity:.45;cursor:not-allowed}.btn-secondary{background:var(--accent-light);color:var(--accent)}.btn-ghost{background:transparent;color:var(--text-muted);border:1px solid var(--border)}.btn-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}.unit-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.75rem}.unit-card{display:block;text-decoration:none;color:inherit;background:var(--surface);border-radius:var(--radius);padding:1rem 1.15rem;border:1px solid var(--border);box-shadow:var(--shadow);transition:border-color .15s,transform .12s}.unit-card:hover{border-color:var(--accent);transform:translateY(-1px);text-decoration:none}.unit-card.locked{opacity:.55;pointer-events:none}.unit-card-header{display:flex;justify-content:space-between;align-items:flex-start;gap:.5rem}.unit-order{font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--accent-warm)}.progress-bar{height:6px;background:var(--accent-light);border-radius:999px;overflow:hidden;margin-top:.65rem}.progress-bar-fill{height:100%;background:var(--accent);border-radius:999px;transition:width .3s ease}.lesson-nav{display:flex;gap:.35rem;flex-wrap:nowrap;overflow-x:auto;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;scrollbar-width:none;margin-bottom:1rem;padding-bottom:.2rem}.lesson-nav::-webkit-scrollbar{display:none}.lesson-tab{padding:.45rem .75rem;border-radius:8px;font-size:.8rem;font-weight:600;border:1px solid var(--border);background:var(--surface);color:var(--text-muted);flex-shrink:0;min-height:44px;white-space:nowrap}.lesson-tab.active{background:var(--accent);color:#fff;border-color:var(--accent)}.lesson-tab.done{border-color:var(--success);color:var(--success)}.vocab-item{padding:.85rem 0;border-bottom:1px dashed var(--border)}.vocab-item:last-child{border-bottom:none}.vocab-word{font-size:1.2rem;font-weight:700;white-space:normal}.vocab-meta{font-size:.88rem;color:var(--text-muted)}.example-line{margin:.35rem 0 0;padding-left:.75rem;border-left:3px solid var(--accent-light)}.example-en-row{display:flex;align-items:flex-start;gap:.35rem}.example-en-row .example-en,.example-en-row p{flex:1;min-width:0}.example-en{font-weight:500}.vocab-word-row{display:flex;flex-wrap:wrap;align-items:center;gap:.35rem .5rem}.vocab-word-row .vocab-meta{width:100%}.speak-btn{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);background:var(--accent-light);border-radius:8px;cursor:pointer;line-height:1;transition:background .15s,transform .1s}.speak-btn--sm{width:2rem;height:2rem;font-size:.95rem}.speak-btn--md{width:auto;height:2.25rem;padding:0 .75rem;font-size:1rem}.speak-btn:hover{background:#b7e4c7}.speak-btn--active{background:var(--accent-warm-light);border-color:var(--accent-warm)}.speak-btn--off{opacity:.5;cursor:not-allowed}.practice-option-row{display:flex;align-items:stretch;gap:.35rem;margin-bottom:.5rem}.practice-option-row .practice-option{flex:1;margin-bottom:0}.reading-card .reading-header{display:flex;align-items:center;gap:.75rem;margin-bottom:.5rem}.reading-intro{font-size:.95rem;color:var(--text-muted)}.reading-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin:1rem 0}.reading-paragraph{margin-bottom:1.25rem;padding-bottom:1rem;border-bottom:1px dashed var(--border)}.reading-paragraph:last-child{border-bottom:none}.reading-en-block{display:flex;align-items:flex-start;gap:.5rem}.reading-en{flex:1;margin:0;font-size:1.05rem;line-height:1.65}.reading-zh{margin:.65rem 0 0;padding:.65rem .85rem;background:var(--accent-light);border-radius:8px;font-size:.92rem;color:var(--text-muted)}.reading-highlights li{margin-bottom:.5rem;list-style:none}.reading-check{display:flex;align-items:center;gap:.5rem;margin:1rem 0;font-size:.92rem;cursor:pointer}.demo-toggle-row{display:flex;flex-wrap:wrap;align-items:center;gap:.65rem;margin-bottom:.85rem;padding-bottom:.85rem;border-bottom:1px dashed var(--border)}.demo-banner{background:#fff8e6;border:1px solid #e9c46a;border-radius:var(--radius);padding:.75rem 1rem;margin-bottom:1rem;font-size:.9rem}.demo-banner-top{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem}.demo-exit{margin-left:auto;padding:.35rem .65rem!important;font-size:.82rem!important}.demo-jump{margin-top:.65rem}.demo-jump summary{cursor:pointer;font-weight:600;color:var(--accent)}.demo-jump-grid{display:flex;flex-direction:column;gap:.75rem;margin-top:.65rem}.demo-jump-unit{padding:.5rem 0;border-bottom:1px dashed var(--border)}.demo-jump-unit:last-child{border-bottom:none}.demo-unit-title{font-weight:600;margin-left:.35rem}.demo-step-links{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:.4rem}.demo-step-link{display:inline-block;padding:.25rem .55rem;border-radius:6px;background:var(--surface);border:1px solid var(--border);font-size:.78rem;font-weight:600;text-decoration:none;color:var(--accent)}.demo-step-link:hover{background:var(--accent-light);text-decoration:none}.learning-path{margin-bottom:1.25rem}.learning-path-hint{font-size:.85rem;margin:.35rem 0 0}.phase-list{list-style:none;padding:0;margin:.75rem 0 0;display:flex;flex-direction:column;gap:.65rem}.phase-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:.85rem 1rem;box-shadow:var(--shadow)}.phase-card--selectable{display:block;width:100%;text-align:left;font:inherit;color:inherit;cursor:pointer;transition:border-color .15s,background .12s}.phase-card--link{display:block;width:100%;text-align:left;text-decoration:none;color:inherit;cursor:pointer;transition:border-color .15s,background .12s,transform .12s}.phase-card--link:hover{border-color:var(--accent);background:var(--accent-light);transform:translateY(-1px);text-decoration:none}.phase-card--selectable:not(:disabled):hover{border-color:var(--accent);background:var(--accent-light)}.phase-card--active{border-color:var(--accent);background:var(--accent-light);box-shadow:0 0 0 1px var(--accent)}.phase-card--selectable:disabled{cursor:default}.stage-page-head{padding:1rem 1.15rem}.phase-unit-list{max-height:none;overflow:visible}.phase-card--soon{opacity:.75;border-style:dashed}.phase-card-head{display:flex;flex-direction:column;gap:.2rem}.phase-num{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--accent-warm)}.roadmap-future{margin-top:.75rem;font-size:.9rem}.roadmap-future summary{cursor:pointer;font-weight:600;color:var(--accent)}.roadmap-future ul{margin:.5rem 0 0;padding-left:1.2rem;color:var(--text-muted)}.clickable-english{line-height:1.65}.clickable-word{display:inline;padding:0 1px;margin:0;border:none;background:transparent;font:inherit;color:inherit;cursor:pointer;border-bottom:2px dotted var(--accent);border-radius:2px;transition:background .12s}.clickable-word:hover,.clickable-word--active{background:var(--accent-light)}.word-popover-meaning-row{display:flex;align-items:flex-start;gap:.5rem;margin:.35rem 0}.word-popover-meaning-row .word-popover-meaning{flex:1;margin:0}.word-popover-add-btn{flex-shrink:0;padding:.35rem .55rem;font-size:.78rem;white-space:nowrap}.clickable-word--saved{border-bottom-color:var(--accent-warm);background:var(--accent-warm-light)}.word-popover{position:fixed;z-index:2000;padding:.75rem .9rem;background:var(--surface);border:2px solid var(--accent);border-radius:12px;box-shadow:0 8px 28px #1b43322e;animation:game-pop .15s ease;pointer-events:auto;max-width:min(272px,calc(100vw - 2rem - var(--safe-left) - var(--safe-right)))}.word-popover-head{display:flex;align-items:center;justify-content:space-between;gap:.35rem}.word-popover-head strong{font-size:1.05rem;color:var(--accent)}.word-popover-meta{margin:.2rem 0 .35rem;font-size:.82rem}.word-popover-meaning{margin:.35rem 0;font-weight:600;line-height:1.45}.word-popover-example{margin:.5rem 0;padding:.5rem .65rem;background:var(--accent-light);border-radius:8px;font-size:.88rem}.word-popover-foot{margin:.5rem 0 0;font-size:.75rem;border-top:1px dashed var(--border);padding-top:.45rem}.word-popover-loading{margin:0;font-size:.9rem;color:var(--text-muted)}.word-save-toast{position:fixed;bottom:calc(5.25rem + var(--safe-bottom));left:50%;transform:translate(-50%);z-index:950;padding:.65rem 1.1rem;border-radius:10px;font-size:.9rem;font-weight:600;box-shadow:var(--shadow);max-width:min(90vw,calc(100vw - 2rem - var(--safe-left) - var(--safe-right)));text-align:center}.word-save-toast--ok{background:#e8f5e9;color:var(--success);border:1px solid var(--success)}.word-save-toast--info{background:var(--surface);color:var(--text-muted);border:1px solid var(--border)}.vocab-book-nav{padding:.35rem .65rem;border-radius:8px;font-size:.85rem;font-weight:600;text-decoration:none;color:var(--accent);background:var(--accent-light);border:1px solid var(--border)}.vocab-book-nav:hover{text-decoration:none;background:#b7e4c7}.vocab-book-nav--active{background:var(--accent);color:#fff}.vocab-book-header{display:flex;justify-content:space-between;align-items:flex-start;gap:.75rem;margin-bottom:1rem}.vocab-book-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.75rem}.vocab-book-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.75rem}.vocab-book-entry-head{display:flex;justify-content:space-between;align-items:flex-start;gap:.5rem}.vocab-book-context{margin-top:.65rem;padding-top:.65rem;border-top:1px dashed var(--border)}.reading-en.clickable-english{flex:1;margin:0;font-size:1.05rem}.game-card{border:2px solid var(--accent-light)}.game-type-badge{font-size:.88rem;color:var(--text-muted);margin:0 0 1rem;padding:.5rem .75rem;background:var(--accent-light);border-radius:8px}.game-shell-inner{margin-top:.25rem}.game-hud{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;margin-bottom:.85rem}.game-hud-emoji{font-size:1.5rem}.game-hud-pill{padding:.25rem .55rem;border-radius:999px;font-size:.78rem;font-weight:700;background:var(--surface);border:1px solid var(--border)}.game-hud-pill--hot{background:var(--accent-warm-light);color:var(--accent-warm);border-color:var(--accent-warm);animation:game-pulse .8s ease infinite}.game-hud-pill--urgent{background:#fde8e8;color:var(--error);border-color:var(--error);animation:game-pulse .5s ease infinite}@keyframes game-pulse{50%{transform:scale(1.04)}}.game-win-banner{text-align:center;padding:1rem;background:linear-gradient(135deg,#e8f5e9,var(--accent-light));border-radius:12px;font-weight:700;font-size:1.05rem;color:var(--success);margin:.75rem 0;animation:game-pop .4s ease}.game-win-spark{display:inline-block;animation:game-spin 1.2s linear infinite;margin:0 .25rem}@keyframes game-pop{0%{transform:scale(.92);opacity:.5}to{transform:scale(1);opacity:1}}@keyframes game-spin{to{transform:rotate(360deg)}}.game-choice-btn{display:block;width:100%;text-align:left;padding:.75rem 1rem;margin-bottom:.45rem;border-radius:12px;border:2px solid var(--border);background:var(--surface);font-size:.95rem;cursor:pointer;transition:transform .1s,border-color .12s}.game-choice-btn:hover:not(:disabled){transform:translateY(-1px);border-color:var(--accent)}.game-choice-btn--sentence{font-size:.88rem;line-height:1.45}.game-choice-btn.correct{border-color:var(--success);background:#e8f5e9}.game-choice-btn.wrong{border-color:var(--error);background:#fde8e8}.game-choice-btn.wrong-highlight{border-color:var(--accent-warm);background:var(--accent-warm-light);box-shadow:0 0 0 2px var(--accent-warm)}.speed-prompt{font-size:1.35rem;font-weight:700;text-align:center;margin:.75rem 0 1rem;color:var(--accent)}.speed-flash.ok .game-choice-btn.correct{animation:game-pop .3s ease}.fill-blitz-sentence{font-size:1.05rem;line-height:1.8;margin:.75rem 0;padding:.85rem;background:var(--accent-light);border-radius:10px}.fill-blitz-slot{display:inline-block;min-width:4rem;padding:.15rem .45rem;margin:0 .15rem;border-bottom:2px dashed var(--accent);font-weight:700;color:var(--accent)}.fill-blitz-slot.filled{border-bottom-style:solid;background:#c7f0d8;border-radius:4px}.fill-blitz-shake{animation:game-shake .4s ease}@keyframes game-shake{20%,60%{transform:translate(-4px)}40%,80%{transform:translate(4px)}}.fill-blitz-chips{margin:.75rem 0}.story-order-slots{min-height:5rem;padding:.75rem;border:2px dashed var(--border);border-radius:12px;margin-bottom:.75rem}.story-order-line{display:flex;gap:.5rem;padding:.5rem 0;border-bottom:1px dashed var(--border);font-size:.92rem;line-height:1.45}.story-order-line--empty{opacity:.45}.story-order-num{flex-shrink:0;width:1.5rem;height:1.5rem;border-radius:50%;background:var(--accent);color:#fff;font-size:.75rem;font-weight:700;display:flex;align-items:center;justify-content:center}.story-order-pool{display:flex;flex-direction:column;gap:.4rem}.story-order-chip{text-align:left;padding:.65rem .85rem;border-radius:10px;border:2px solid var(--border);background:var(--surface);font-size:.88rem;cursor:pointer}.story-order-chip:hover{border-color:var(--accent);background:var(--accent-light)}.emoji-guess-stage{text-align:center;padding:1rem;margin:.75rem 0 1rem;background:var(--accent-warm-light);border-radius:14px}.emoji-guess-big{font-size:3rem;display:block;margin-bottom:.35rem}.emoji-guess-hint{font-weight:600;margin:0;font-size:1.1rem}.example-zh{font-size:.9rem;color:var(--text-muted)}.grammar-rule{background:var(--accent-light);padding:.85rem 1rem;border-radius:10px;margin:.75rem 0;font-size:.95rem}.grammar-pattern{font-family:ui-monospace,Cascadia Code,Consolas,monospace;font-size:.88rem;color:var(--accent);margin:.5rem 0}.mistake-box{background:var(--accent-warm-light);padding:.65rem .85rem;border-radius:8px;margin-top:.5rem;font-size:.9rem}.practice-option{display:block;width:100%;text-align:left;padding:.75rem 1rem;margin-bottom:.5rem;border-radius:10px;border:2px solid var(--border);background:var(--surface);font-size:.95rem;color:var(--text)}.practice-option.selected{border-color:var(--accent);background:var(--accent-light)}.practice-option.correct{border-color:var(--success);background:#e8f5e9}.practice-option.wrong{border-color:var(--error);background:#fde8e8}.feedback{margin-top:.75rem;padding:.75rem 1rem;border-radius:10px;font-size:.92rem}.feedback.ok{background:#e8f5e9;color:var(--success)}.feedback.err{background:#fde8e8;color:var(--error)}.game-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem}@media(min-width:480px){.game-grid{grid-template-columns:repeat(4,1fr)}}.memory-card{aspect-ratio:1;border-radius:10px;border:2px solid var(--border);background:var(--accent-light);font-size:.78rem;font-weight:600;display:flex;align-items:center;justify-content:center;text-align:center;padding:.35rem;transition:transform .15s,background .15s}.memory-card.flipped{background:var(--surface)}.memory-card.matched{background:#c7f0d8;border-color:var(--success);visibility:hidden}.word-chip{display:inline-block;padding:.45rem .75rem;margin:.25rem;border-radius:8px;background:var(--accent-light);border:1px solid var(--border);font-weight:600;cursor:grab;-webkit-user-select:none;user-select:none}.word-chip.used{opacity:.3;pointer-events:none}.sentence-build-area{min-height:3rem;padding:.75rem;border:2px dashed var(--border);border-radius:10px;margin:.75rem 0}.hero-note{background:linear-gradient(135deg,var(--accent-light) 0%,#fff 100%);border-radius:var(--radius);padding:1.25rem;margin-bottom:1.25rem;border:1px solid var(--border)}.hero-note p{margin:.35rem 0}.tag{display:inline-block;font-size:.72rem;font-weight:700;padding:.2rem .5rem;border-radius:6px;background:var(--accent-light);color:var(--accent);margin-right:.35rem}.word-progress-card{margin-bottom:1.25rem}.word-progress-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:.5rem}.listen-lab-page{display:flex;flex-direction:column;gap:.75rem}.listen-lab-head{display:flex;flex-direction:column;gap:.35rem}.listen-lab-title{margin:0;font-size:1.15rem}.listen-lab-intro{margin:0;font-size:.82rem;line-height:1.45}.listen-lab-picker{display:flex;flex-direction:column;gap:.3rem;margin-top:.15rem}.listen-lab-picker-label{font-size:.78rem;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em}.listen-lab-select{width:100%;min-height:44px;padding:.55rem 2rem .55rem .75rem;border:2px solid var(--border);border-radius:10px;background:var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2352796f' d='M1 1l5 5 5-5'/%3E%3C/svg%3E") no-repeat right .75rem center;-webkit-appearance:none;-moz-appearance:none;appearance:none;font:inherit;font-size:.92rem;font-weight:600;color:var(--text);cursor:pointer}.listen-lab-select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #2d6a4f26}.listen-lab-page .listen-speak-card{margin-bottom:0}.listen-lab-foot{margin:0;font-size:.8rem;line-height:1.45}.listen-speak-card .listen-target-box{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin:1rem 0;padding:1rem;background:var(--accent-light);border-radius:10px}.listen-target-text{font-size:1.25rem;font-weight:700;flex:1;min-width:120px}.listen-input{width:100%;padding:.75rem;border:2px solid var(--border);border-radius:8px;font-size:1rem;margin-bottom:.75rem}.surprise-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#1b43328c;display:flex;align-items:center;justify-content:center;z-index:1000;padding:max(.75rem,var(--safe-top)) var(--page-pad-x) max(.75rem,var(--safe-bottom))}.surprise-modal{background:var(--surface);border-radius:var(--radius);padding:1.5rem;max-width:420px;box-shadow:var(--shadow);border:2px solid var(--accent-warm);text-align:center}.surprise-badge{display:inline-block;background:var(--accent-warm-light);color:var(--accent-warm);font-weight:700;font-size:.85rem;padding:.35rem .75rem;border-radius:999px;margin-bottom:.75rem}.surprise-quote{margin:1rem 0;padding:.75rem;background:var(--accent-light);border-radius:8px;font-size:.95rem}.review-stats-card{margin-bottom:1rem}.review-stats-list{margin:0;padding-left:1.25rem;line-height:1.7}.review-check-row{display:flex;align-items:flex-start;gap:.5rem;margin-bottom:.65rem;cursor:pointer;font-size:.92rem}.review-card{max-width:520px;text-align:center;padding:1.5rem}.review-word-row{display:flex;align-items:center;justify-content:center;gap:.75rem;flex-wrap:wrap}.review-word{font-size:1.75rem;font-weight:700;color:var(--text);word-break:break-word;white-space:normal}.review-meaning{font-size:1.35rem;font-weight:600;color:var(--accent);margin:.75rem 0}.review-example{text-align:left;margin:1rem 0;padding:.75rem;background:var(--accent-light);border-radius:8px}.review-answer-row{justify-content:center;margin-top:1rem}.review-summary{max-width:480px}.red-packet-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1100;display:flex;align-items:center;justify-content:center;padding:max(.75rem,var(--safe-top)) var(--page-pad-x) max(.75rem,var(--safe-bottom));background:#140a0a9e;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.red-packet-modal{position:relative;width:auto;background:transparent;overflow:visible;transition:width .45s ease,min-height .45s ease,border-radius .45s ease,box-shadow .45s ease}.red-packet-modal--opened{width:min(340px,88vw);min-height:min(500px,76dvh);border-radius:16px;overflow:hidden;box-shadow:0 20px 50px #00000061}.red-packet-bg{position:absolute;top:0;right:0;bottom:0;left:0;background-size:cover;background-position:center center;background-repeat:no-repeat;z-index:0}.red-packet-bg:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(180deg,#ffffff1f,#ffffffad 42%,#fffffff0)}.red-packet-cover-stage{position:relative;z-index:1;animation:red-packet-pop .55s cubic-bezier(.34,1.4,.64,1) both}.red-packet-figure{position:relative;width:min(250px,72vw);margin:0;filter:drop-shadow(0 18px 36px rgba(0,0,0,.38))}.red-packet-cover-full{display:block;width:100%;height:auto;-webkit-user-select:none;user-select:none;pointer-events:none}.red-packet-open-hit{position:absolute;left:50%;top:77%;transform:translate(-50%,-50%);width:30%;min-width:68px;min-height:68px;aspect-ratio:1;padding:0;border:none;border-radius:50%;background:transparent;cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation;transition:background .15s ease,transform .12s ease}.red-packet-open-hit:hover{background:#ffffff24}.red-packet-open-hit:active{transform:translate(-50%,-50%) scale(.94)}.red-packet-opened-stage{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;text-align:center;padding:2.25rem 1.25rem 1.35rem;min-height:min(500px,76dvh);justify-content:flex-end;animation:red-packet-open-reveal .45s ease both}.red-packet-opened-title{margin:0 0 .35rem;font-size:1.05rem;font-weight:700;color:var(--text)}.red-packet-opened-amount{margin:0 0 .65rem;line-height:1}.red-packet-yuan{font-size:clamp(2.35rem,11vw,3.25rem);font-weight:800;color:#c1121f;letter-spacing:-.02em}.red-packet-unit{margin-left:.15rem;font-size:1.15rem;font-weight:700;color:#c1121f}.red-packet-opened-msg{margin:0 0 .75rem;font-size:.95rem;line-height:1.55;color:var(--text);max-width:18rem}.red-packet-opened-stats{margin:0 0 .35rem;font-size:.9rem;color:var(--text-muted)}.red-packet-opened-hint{margin:0 0 1.1rem;font-size:.82rem;color:var(--text-muted)}.red-packet-actions{width:100%;justify-content:center}.red-packet-actions .btn{min-width:7.5rem}@keyframes red-packet-pop{0%{opacity:0;transform:scale(.35) translateY(24px)}65%{opacity:1;transform:scale(1.04) translateY(-4px)}to{opacity:1;transform:scale(1) translateY(0)}}@keyframes red-packet-open-reveal{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.review-reward-message{margin:0 0 1rem;padding:.85rem 1rem;background:var(--accent-warm-light);border:2px solid var(--accent-warm);border-radius:var(--radius);font-size:1rem;line-height:1.55;color:var(--text)}.review-reward-message strong{font-size:1.15rem;color:var(--accent-warm)}.settings-section{margin-bottom:1rem}.settings-stats{margin:0;padding-left:1.25rem;line-height:1.7}.settings-mode{border:none;margin:0 0 1rem;padding:0}.settings-mode legend{font-weight:600;font-size:.92rem;margin-bottom:.5rem}.settings-file-input{display:none}.settings-preview{margin-top:.75rem;padding:.75rem;background:var(--accent-light);border-radius:8px}.cultural-flavor-banner{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1rem;margin-bottom:1rem;padding:.65rem .85rem;border-radius:10px;font-size:.92rem;font-weight:600;word-break:break-word}.cultural-flavor-banner--netherlands{background:#fff4e6;border:1px solid #ffb366;color:#8b4513}.cultural-flavor-banner--nishuihan{background:#f3e8ff;border:1px solid #c4a7e7;color:#4a2c6a}.page-bg-shell{position:relative;isolation:isolate}.page-bg-layer{position:fixed;top:0;right:0;bottom:0;left:0;z-index:0;background-size:cover;background-position:center top;background-repeat:no-repeat;pointer-events:none}.page-bg-layer:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#f8f6f2d6}.page-bg-content{position:relative;z-index:1}.page-bg-shell .card,.page-bg-shell .lesson-nav,.page-bg-shell .cultural-flavor-banner,.page-bg-shell .practice-block,.page-bg-shell .reading-section,.page-bg-shell .listen-speak-section,.page-bg-shell .home-quick-link,.page-bg-shell .phase-card,.page-bg-shell .stage-page-head,.page-bg-shell .learning-path,.page-bg-shell .word-progress-card{background:#ffffffed;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.app-shell--has-bg .app-header{position:relative;z-index:2;background:#f8f6f2f0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);margin-left:calc(-1 * var(--page-pad-x));margin-right:calc(-1 * var(--page-pad-x));padding-left:var(--page-pad-x);padding-right:var(--page-pad-x)}.app-shell--subpage .home-back-fab{background:#fffffff5;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--accent);border-color:var(--border);box-shadow:0 4px 20px #1b43321f}.app-shell--subpage .home-back-fab:hover{background:var(--accent-light);color:var(--text)}.lesson-unit-head{display:flex;flex-wrap:wrap;align-items:center;gap:.35rem .5rem;margin-top:0;word-break:break-word}.lesson-unit-head .tag{margin-left:0}@media(max-width:480px){.card{padding:1rem}.app-header h1{font-size:1.1rem}.home-back-header-label{font-size:.95rem}.vocab-book-nav{font-size:.8rem;padding:.35rem .55rem}.home-quick-nav{gap:.45rem}.home-quick-link{padding:.65rem .75rem}.red-packet-overlay{align-items:center;justify-content:center;padding:max(.75rem,var(--safe-top)) var(--page-pad-x) max(.75rem,var(--safe-bottom))}.red-packet-opened-stage{padding:2rem 1rem 1.25rem;min-height:min(480px,72dvh)}.red-packet-actions{flex-direction:column;align-items:stretch}.red-packet-actions .btn{min-width:0;width:100%}.review-answer-row{flex-direction:column;align-items:stretch}.review-answer-row .btn{width:100%}.surprise-overlay{align-items:flex-end}.surprise-modal{width:100%;max-width:none;border-bottom-left-radius:0;border-bottom-right-radius:0}.word-popover-meaning-row{flex-direction:column;align-items:stretch}.word-popover-add-btn{width:100%;justify-content:center}input,textarea,select,.listen-input{font-size:16px}.memory-card{font-size:.72rem;padding:.25rem}.demo-exit{margin-left:0;width:100%;margin-top:.35rem}}@media(min-width:481px){.lesson-nav{flex-wrap:wrap;overflow-x:visible}}@media(min-width:600px){.red-packet-overlay,.surprise-overlay{align-items:center}.surprise-modal{border-radius:var(--radius)}}