:root{--color-apple-blue: #0071e3;--color-link-blue: #0066cc;--color-signal-blue: #2997ff;--color-carbon: #1d1d1f;--color-frost: #f5f5f7;--color-ice: #f4f8fb;--color-smoke: #333333;--color-graphite: #474747;--color-ash: #707070;--color-mist: #858585;--color-onyx: #000000;--color-pebble: #e2e2e5;--color-hairline: #d2d2d7;--color-danger: #d70015;--font-sf-pro-display: "SF Pro Display", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Segoe UI", sans-serif;--font-sf-pro-text: "SF Pro Text", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Segoe UI", sans-serif;--text-caption: 12px;--leading-caption: 1.33;--tracking-caption: -.264px;--text-body-sm: 14px;--leading-body-sm: 1.29;--tracking-body-sm: -.224px;--text-body: 17px;--leading-body: 1.47;--tracking-body: -.272px;--text-subheading: 21px;--leading-subheading: 1.24;--tracking-subheading: -.105px;--text-heading-sm: 28px;--leading-heading-sm: 1.18;--tracking-heading-sm: .196px;--text-heading: 40px;--leading-heading: 1.14;--tracking-heading: .44px;--font-weight-light: 300;--font-weight-regular: 400;--font-weight-semibold: 600;--spacing-4: 4px;--spacing-8: 8px;--spacing-12: 12px;--spacing-16: 16px;--spacing-20: 20px;--spacing-24: 24px;--spacing-40: 40px;--radius-cards: 8px;--radius-inputs: 8px;--radius-buttons: 980px;--radius-full: 980px;--surface-canvas: var(--color-frost);--surface-elevated-wash: var(--color-ice);--surface-pebble: var(--color-pebble);--paper: var(--color-frost);--paper-deep: var(--color-pebble);--ink: var(--color-carbon);--ink-soft: var(--color-ash);--card: #ffffff;--line: var(--color-hairline);--known: var(--color-apple-blue);--unknown: var(--color-link-blue);--danger: var(--color-danger);--safe-bottom: env(safe-area-inset-bottom, 0px);--browser-bottom: 0px;--inset-bottom: max(var(--safe-bottom), var(--browser-bottom));--app-vh: 100dvh;--vv-top: 0px;--card-min-height: 380px}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%}html,body,#root{height:100%;max-height:100%;min-height:100%;overflow-x:visible;overflow-y:hidden}html.is-keyboard .quiz-page{top:var(--vv-top, 0px);padding-bottom:12px}body{margin:0;color:var(--color-carbon);background:var(--surface-canvas);font-family:var(--font-sf-pro-text);font-size:var(--text-body);font-weight:var(--font-weight-regular);line-height:var(--leading-body);letter-spacing:-.016em;-webkit-font-smoothing:antialiased}button,input{font:inherit;letter-spacing:inherit}button{cursor:pointer}.app-shell{width:min(430px,100%);min-height:100dvh;margin:0 auto;padding:20px 20px calc(24px + var(--inset-bottom));display:flex;flex-direction:column;overflow:visible}.brand{font-size:var(--text-caption);font-weight:var(--font-weight-regular);letter-spacing:var(--tracking-caption);color:var(--color-ash);margin:0 0 8px}.site-header{display:flex;align-items:flex-start;gap:12px;margin-bottom:24px}.site-header-actions{flex:none;margin-left:auto;align-self:center}.site-logo{width:40px;height:40px;flex:none;object-fit:contain;display:block}.site-heading{min-width:0}.site-name{font-family:var(--font-sf-pro-display);font-size:var(--text-subheading);font-weight:var(--font-weight-semibold);line-height:var(--leading-subheading);letter-spacing:var(--tracking-subheading);color:var(--color-carbon);margin:0 0 4px}.home-motto{font-family:var(--font-sf-pro-text);font-size:var(--text-body);font-weight:var(--font-weight-light);line-height:var(--leading-body);letter-spacing:var(--tracking-body);margin:0;color:var(--color-ash)}@keyframes home-logo-spin{0%{transform:rotate(0);animation-timing-function:linear}96.667%{transform:rotate(0);animation-timing-function:cubic-bezier(.42,0,.58,1)}to{transform:rotate(1080deg)}}.home-page .site-logo{transform-origin:center center;animation:home-logo-spin 30s infinite}.home-page{min-height:var(--app-vh, 100dvh);max-height:var(--app-vh, 100dvh);overflow:hidden;gap:clamp(8px,1.2dvh,12px);padding-top:clamp(12px,2dvh,20px);padding-bottom:calc(8px + var(--inset-bottom))}.home-body{flex:1 1 auto;min-height:0;display:flex;flex-direction:column;gap:clamp(8px,1.2dvh,12px);overflow-y:auto;-webkit-overflow-scrolling:touch}.home-page .site-header{flex-shrink:0;margin-bottom:clamp(6px,1dvh,12px)}.home-page .panel{padding:clamp(14px,2dvh,20px)}.home-main{flex-shrink:0}.home-main .stat-row{margin-bottom:clamp(10px,1.5dvh,14px)}.home-main .plan-bar{display:flex;align-items:center;gap:clamp(8px,2vw,12px);margin-top:clamp(2px,.4dvh,4px);padding:clamp(6px,1dvh,8px);background:var(--color-frost);border:1px solid var(--color-hairline);border-radius:var(--radius-cards)}.home-main .plan-bar-label{flex:none;padding:clamp(6px,1dvh,8px) clamp(8px,2.2vw,10px);font-family:var(--font-sf-pro-display);font-size:clamp(12px,3.2vw,var(--text-body-sm));font-weight:var(--font-weight-semibold);line-height:1.2;letter-spacing:var(--tracking-body-sm);color:var(--color-carbon);white-space:nowrap}.home-main .plan-options--inline{flex:1;min-width:0;margin-top:0;gap:clamp(4px,1.2vw,6px)}.home-main .plan-option{padding:clamp(7px,1.1dvh,9px) clamp(2px,.8vw,4px);font-size:clamp(11px,3vw,var(--text-body-sm))}.home-daily-hint{margin:clamp(12px,1.6dvh,16px) 0 0;padding:clamp(11px,1.5dvh,14px) clamp(14px,4vw,18px);text-align:center;background:var(--color-ice);border:1px solid var(--color-hairline);border-radius:var(--radius-cards);color:var(--color-graphite);font-size:clamp(14px,3.8vw,var(--text-body-sm));line-height:1.35;letter-spacing:var(--tracking-body-sm)}.home-daily-hint strong{display:inline-block;margin:0 .15em;font-family:var(--font-sf-pro-display);font-size:clamp(24px,6.8vw,32px);font-weight:var(--font-weight-semibold);line-height:1;letter-spacing:.02em;color:var(--color-apple-blue);font-variant-numeric:tabular-nums;vertical-align:-.06em}.home-cta{margin-top:clamp(10px,1.4dvh,12px)}.home-cta .btn{min-height:clamp(44px,6dvh,48px)}.home-page .error{margin:6px 0 0;min-height:0}.home-page .calendar-panel{flex:1 1 auto;min-height:0;display:flex;flex-direction:column;margin:0;padding:clamp(10px,1.6dvh,16px) clamp(12px,2vw,18px) clamp(8px,1.2dvh,12px);overflow:hidden}.home-page .cal-nav{margin-bottom:clamp(6px,1dvh,10px)}.home-page .cal-nav-btn{width:clamp(30px,8vw,34px);height:clamp(30px,8vw,34px);font-size:18px}.home-page .cal-title{font-size:clamp(16px,4.2vw,19px)}.home-page .cal-grid{flex:1 1 auto;min-height:0;align-content:start;overflow-y:auto;-webkit-overflow-scrolling:touch}.home-page .cal-day{min-height:clamp(30px,7.8vw,38px);padding:2px 0 1px;font-size:clamp(12px,3.2vw,14px)}.home-page .cal-day.is-today span{width:clamp(22px,6vw,26px);height:clamp(22px,6vw,26px)}.home-page .cal-hint{margin-top:clamp(4px,.8dvh,6px);font-size:11px;line-height:1.3}.home-settings{position:relative}.home-settings-btn{display:grid;place-items:center;width:36px;height:36px;padding:0;border:1px solid var(--color-hairline);border-radius:var(--radius-full);background:#fff;color:var(--color-graphite)}.home-settings-btn:active{background:var(--color-pebble)}.home-settings-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:40;border:0;padding:0;margin:0;background:transparent;cursor:default}.home-settings-menu{position:absolute;top:calc(100% + 6px);right:0;z-index:41;min-width:148px;padding:6px;border:1px solid var(--color-hairline);border-radius:12px;background:#fff;box-shadow:0 8px 24px #00000014}.home-settings-item{display:block;width:100%;padding:10px 12px;border:0;border-radius:8px;background:transparent;color:var(--color-carbon);font-size:var(--text-body-sm);text-align:left}.home-settings-item:active{background:var(--color-pebble)}.calendar-panel{margin-bottom:12px;padding:24px 24px 20px}@media (max-height: 700px){.home-page .site-logo{width:34px;height:34px}.home-page .site-name{font-size:17px;margin-bottom:2px}.home-page .home-motto{font-size:13px;line-height:1.35}.home-page .stat b{font-size:clamp(17px,4.8vw,22px)}.home-page .stat-head{margin-bottom:6px;gap:4px}}.cal-nav{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.cal-title{margin:0;font-family:var(--font-sf-pro-display);font-size:var(--text-subheading);font-weight:var(--font-weight-semibold);line-height:var(--leading-subheading);letter-spacing:var(--tracking-subheading)}.cal-nav-btn{width:36px;height:36px;border:1px solid var(--color-hairline);background:var(--surface-elevated-wash);border-radius:var(--radius-full);font-size:22px;line-height:1;color:var(--color-carbon)}.cal-nav-btn:active{background:var(--color-pebble)}.cal-week{display:grid;grid-template-columns:repeat(7,1fr);margin-bottom:4px;color:var(--color-ash);font-size:var(--text-caption);line-height:var(--leading-caption);letter-spacing:var(--tracking-caption);text-align:center}.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:2px}.cal-day{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:44px;padding:4px 0 2px;border:0;background:transparent;color:var(--color-carbon);font-size:var(--text-body-sm);border-radius:var(--radius-cards)}.cal-day:disabled{cursor:default}.cal-day.is-out{color:var(--color-mist)}.cal-day.is-today span{display:grid;place-items:center;width:28px;height:28px;border-radius:var(--radius-full);background:var(--color-apple-blue);color:var(--color-ice)}.cal-day.is-done:not(:disabled){cursor:pointer}.cal-day.is-done:not(:disabled):active{background:var(--color-pebble)}.cal-dot,.cal-dot-slot{display:block;width:5px;height:5px;margin-top:3px;border-radius:var(--radius-full)}.cal-dot{background:var(--color-apple-blue)}.cal-dot-slot{background:transparent}.cal-hint{margin:8px 0 0;color:var(--color-ash);font-size:var(--text-caption);line-height:var(--leading-caption);letter-spacing:var(--tracking-caption);text-align:center}.day-sheet-mask{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;background:#00000052;display:flex;align-items:flex-end;justify-content:center}.day-sheet{width:min(430px,100%);max-height:min(78dvh,640px);overflow:auto;background:#fff;border-radius:8px 8px 0 0;padding:24px 24px calc(24px + var(--inset-bottom))}.day-sheet-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px}.day-sheet-head h2{margin:0;font-family:var(--font-sf-pro-display);font-size:var(--text-subheading);font-weight:var(--font-weight-semibold);line-height:var(--leading-subheading)}.day-sheet-head p{margin:4px 0 0;color:var(--color-ash);font-size:var(--text-body-sm)}.day-sheet-head .btn{width:auto;padding:8px 4px}.day-group-list{list-style:none;margin:0;padding:0}.day-group-item{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 0;border:0;border-top:1px solid var(--color-hairline);background:transparent;color:inherit;text-align:left}.day-group-item:active{opacity:.72}.day-group-main{display:flex;flex-direction:column;gap:4px}.day-group-main b{font-family:var(--font-sf-pro-display);font-size:var(--text-body);font-weight:var(--font-weight-semibold)}.day-group-meta{color:var(--color-ash);font-size:var(--text-body-sm)}.day-group-time{flex:none;color:var(--color-apple-blue);font-size:var(--text-body-sm);font-variant-numeric:tabular-nums}.day-word-list{list-style:none;margin:0;padding:0}.day-word-list li{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;padding:12px 0;border-top:1px solid var(--color-hairline)}.day-word-list b{font-family:var(--font-sf-pro-display);font-size:var(--text-body);font-weight:var(--font-weight-semibold)}.day-word-pos{margin-left:8px;color:var(--color-ash);font-size:var(--text-caption)}.day-word-list p{margin:4px 0 0;color:var(--color-ash);font-size:var(--text-body-sm)}.tag-known,.tag-unknown{flex:none;font-style:normal;font-size:var(--text-caption);font-weight:var(--font-weight-regular);padding:4px 10px;border-radius:var(--radius-full)}.tag-known{color:var(--color-ice);background:var(--color-apple-blue)}.tag-unknown{color:var(--color-link-blue);background:transparent;border:1px solid var(--color-link-blue)}h1{font-family:var(--font-sf-pro-display);font-size:var(--text-heading-sm);font-weight:var(--font-weight-semibold);line-height:var(--leading-heading-sm);letter-spacing:var(--tracking-heading-sm);margin:0 0 6px}.lede{margin:0 0 28px;color:var(--color-ash);font-weight:var(--font-weight-light)}.password-wrap{position:relative}.password-wrap input{padding-right:52px}.password-toggle{position:absolute;right:10px;top:50%;transform:translateY(-50%);border:0;background:none;color:var(--color-link-blue);font-size:var(--text-body-sm);padding:4px}.field-hint{margin:6px 0 0;color:var(--color-ash);font-size:var(--text-caption)}.panel{background:#fff;border:1px solid var(--color-hairline);border-radius:var(--radius-cards);padding:24px}.stat-row{display:flex;justify-content:space-between;gap:12px;margin-bottom:16px}.stat{flex:1;min-width:0}.stat-head{display:flex;align-items:baseline;justify-content:space-between;gap:6px;margin-bottom:8px;min-width:0}.stat b{font-family:var(--font-sf-pro-display);font-size:clamp(18px,5.2vw,var(--text-heading-sm));font-weight:var(--font-weight-semibold);line-height:1.15;letter-spacing:var(--tracking-heading-sm);font-variant-numeric:tabular-nums;white-space:nowrap;flex-shrink:1;min-width:0;text-align:right}.stat span{color:var(--color-ash);font-size:clamp(11px,3.1vw,var(--text-caption));letter-spacing:var(--tracking-caption);line-height:1.2;white-space:nowrap;flex-shrink:0}.stat-bar{height:4px;background:var(--color-pebble);border-radius:var(--radius-full);overflow:hidden}.stat-bar i{display:block;height:100%;background:var(--color-apple-blue);border-radius:inherit}label{display:block;font-size:var(--text-caption);color:var(--color-ash);margin-bottom:6px}input[type=text],input[type=password],input[type=number]{width:100%;border:1px solid var(--color-hairline);background:var(--color-frost);border-radius:var(--radius-inputs);padding:12px 14px;font-size:var(--text-body);outline:none}input:focus{border-color:var(--color-apple-blue);box-shadow:0 0 0 2px #0071e33d}.field{margin-bottom:14px}.btn{width:100%;border:0;border-radius:var(--radius-buttons);padding:11px 15px;font-size:var(--text-body);font-weight:var(--font-weight-regular);letter-spacing:-.022em}.btn-primary,.btn-known{background:var(--color-apple-blue);color:var(--color-ice)}.btn-primary:disabled,.btn-known:disabled{background:var(--color-pebble);color:var(--color-ash);cursor:not-allowed;opacity:1}.btn-primary:active:not(:disabled),.btn-known:active:not(:disabled){filter:brightness(.94)}.btn-ghost,.ghost-link{background:transparent;color:var(--color-link-blue);text-decoration:none}.btn-ghost:hover,.ghost-link:hover,.btn-ghost:active,.ghost-link:active{text-decoration:underline}.btn-unknown{background:transparent;color:var(--color-link-blue);border:1px solid var(--color-link-blue)}.btn-unknown:active:not(:disabled){background:var(--surface-elevated-wash)}.btn-unknown:disabled{opacity:.4;cursor:not-allowed}.switch{display:flex;justify-content:center;gap:8px;margin-top:16px;color:var(--color-ash);font-size:var(--text-body-sm)}.switch button{border:0;background:none;color:var(--color-link-blue);font-weight:var(--font-weight-regular);padding:0}.switch button:hover,.switch button:active{text-decoration:underline}.error{color:var(--color-danger);font-size:var(--text-body-sm);min-height:1.3em;margin:0 0 12px}.days{display:flex;align-items:center;gap:10px}.days input{text-align:center;font-variant-numeric:tabular-nums;font-size:20px;font-weight:var(--font-weight-semibold)}.step{width:44px;height:44px;border:1px solid var(--color-hairline);background:#fff;border-radius:var(--radius-full);font-size:22px;line-height:1;flex:none}.hint{margin:10px 0 0;color:var(--color-ash);font-size:var(--text-body-sm)}.cta-wrap{margin-top:auto;padding-top:24px}.progress-bar{height:4px;background:var(--color-pebble);border-radius:var(--radius-full);overflow:hidden}.progress-bar i{display:block;height:100%;background:var(--color-apple-blue);border-radius:inherit}.plan-options{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:8px}.plan-option{border:1px solid var(--color-hairline);background:transparent;border-radius:var(--radius-full);padding:11px 8px;font-size:var(--text-body-sm);font-weight:var(--font-weight-regular);color:var(--color-link-blue)}.plan-option.is-active{background:var(--color-apple-blue);border-color:var(--color-apple-blue);color:var(--color-ice)}.study-page{display:grid;grid-template-rows:auto minmax(0,1fr) auto;box-sizing:border-box;height:var(--app-vh);min-height:var(--app-vh);max-height:var(--app-vh);padding:10px 14px calc(6px + var(--inset-bottom));overflow:hidden}.study-page.is-open{overflow:visible}.study-header{flex-shrink:0}.study-main{display:flex;flex-direction:column;justify-content:flex-start;align-items:stretch;min-width:0;min-height:0;padding:2px 0 0;overflow:visible;container-type:size;container-name:study-main}.study-error{margin:12px 0 0;text-align:center}.study-footer{flex-shrink:0;padding-top:8px;padding-bottom:0;background:transparent}.study-page .actions .btn{min-height:48px}.card-stage{width:min(100%,390px);margin:0 auto;transform-style:preserve-3d;container-type:inline-size;overflow:visible;--radius-duo: 27px;--radius-duo: calc(100cqw * 62 / 890);--page-h-ratio: calc(100cqw * 1878 / 2670);--page-h: min(var(--page-h-ratio), 100cqh);--flip-dur: 1.2s;--close-dur: .3s}.study-page.is-open .card-stage{--page-h: min(var(--page-h-ratio), 50cqh)}@property --gap{syntax: "<number>"; inherits: true; initial-value: 0;}@property --void{syntax: "<number>"; inherits: true; initial-value: 0;}.card-flipper{display:block;width:100%;border:0;padding:0;background:transparent;cursor:pointer;position:relative;overflow:visible;transform-style:preserve-3d;--gap: 0;--void: 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