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(orientation:landscape) and (height<=480px){.board-welcome{text-align:left;flex-direction:row;justify-content:center;align-items:center;gap:clamp(18px,4vw,44px);width:min(760px,100vw - 88px);top:50%}.board-welcome-title{flex:auto;max-width:320px;font-size:clamp(1.1rem,1rem + 1.4vw,1.5rem);line-height:1.22}.board-welcome-examples{flex-flow:column;flex:none;align-items:flex-start;gap:6px}.board-welcome-chip{gap:7px;padding:4px 11px 4px 4px;font-size:.76rem}.welcome-chip-icon{flex-basis:24px;width:24px;height:24px}.welcome-chip-icon svg{width:14px;height:14px}.bottom-composer{width:min(640px,100vw - 40px)}}.board-svg-shape,.board-svg-shape svg{width:100%;height:100%;display:block}.board-image-shape{object-fit:contain;object-position:center;-webkit-user-select:none;user-select:none;-webkit-user-drag:none;width:100%;height:100%;display:block}.board-svg-shape svg{overflow:visible}@media (width>=520px) and (width<=1024px) and (height<=480px) and 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/ 2)}.mobile-study .voice-pause-panel,.mobile-study .response-panel{left:calc((100% - var(--lesson-rail)) / 2);max-width:calc(100% - var(--lesson-rail) - 24px)}.mobile-composer-close{color:#343434;min-height:44px;font:inherit;background:#fff;border:1px solid #e5e1d6;border-radius:22px;align-items:center;gap:6px;margin:0 0 4px auto;padding:0 12px;font-size:12px;display:flex}.mobile-composer-close:focus-visible{outline-offset:2px;outline:2px solid #ffcf32}.mobile-study .topbar-compact{transition:transform .24s,opacity .24s}.mobile-study.lesson-running{--lesson-rail:0px}.mobile-study.lesson-running .topbar-compact{opacity:0;pointer-events:none;transform:translate(100%)}.mobile-study.lesson-running .board-shell{border-radius:0;inset:0}.lesson-pill{z-index:45;right:max(10px, env(safe-area-inset-right,0px));-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#ffffffeb;border:1px solid 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56px);color:#fff;white-space:nowrap;pointer-events:none;background:#101113e0;border-radius:18px;padding:8px 14px;font-size:.82rem;line-height:1.3;animation:.16s both screen-lock-hint-in;position:fixed;bottom:71px}}@keyframes screen-lock-nudge{50%{transform:scale(1.14)}}@keyframes screen-lock-hint-in{0%{opacity:0;transform:translate(6px)}}@media (prefers-reduced-motion:reduce){.lesson-pill-button.is-nudged,.screen-lock-hint{animation:none}}.photo-source-menu{z-index:60;background:#fff;border:1px solid #10111314;border-radius:14px;flex-direction:column;min-width:220px;padding:6px;display:flex;position:absolute;bottom:calc(100% + 8px);right:8px;box-shadow:0 1px 2px #1011130a,0 14px 36px -10px #1011132e}.photo-source-menu button{color:#262626;min-height:48px;font:inherit;text-align:left;cursor:pointer;background:0 0;border:0;border-radius:12px;align-items:center;gap:12px;padding:0 14px;font-size:15px;display:flex}.photo-source-menu button:active,.photo-source-menu 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#0000008c}.photo-crop-handle{touch-action:none;border:4px solid #ffcf32;width:28px;height:28px;position:absolute}.photo-crop-handle.is-tl{border-bottom:0;border-right:0;top:-6px;left:-6px}.photo-crop-handle.is-tr{border-bottom:0;border-left:0;top:-6px;right:-6px}.photo-crop-handle.is-bl{border-top:0;border-right:0;bottom:-6px;left:-6px}.photo-crop-handle.is-br{border-top:0;border-left:0;bottom:-6px;right:-6px}.photo-cropper-actions{padding:16px;padding-bottom:max(16px, env(safe-area-inset-bottom));justify-content:space-between;gap:12px;display:flex}.photo-cropper-actions button{border:0;border-radius:999px;align-items:center;gap:8px;padding:12px 20px;font-size:.95rem;font-weight:700;display:inline-flex}.photo-cropper-retake{color:#fff;background:#ffffff1f}.photo-cropper-use{color:#191b22;background:#ffcf32}.photo-viewer{justify-content:center;align-items:center}.photo-viewer img{object-fit:contain;max-width:100%;max-height:100%}.photo-viewer-close{position:absolute;top:12px;right:12px}.signin-page{--signin-wall:#e8e7e3;z-index:200;background:var(--signin-wall);color:#101113;grid-template-columns:minmax(0,1.15fr) minmax(440px,.85fr);display:grid;position:fixed;inset:0}.signin-art{background:#141414 -webkit-image-set(url(/signin-saitama.avif) 1x type("image/avif"),url(/signin-saitama.webp) 1x type("image/webp"),url(/signin-saitama.jpg) 1x type("image/jpeg")) 60%/cover no-repeat;background:#141414 image-set("/signin-saitama.avif" 1x type("image/avif"),"/signin-saitama.webp" 1x type("image/webp"),"/signin-saitama.jpg" 1x type("image/jpeg")) 60%/cover no-repeat;position:relative}.signin-panel{min-height:0;padding:calc(32px + var(--safe-top)) clamp(28px, 4.5vw, 72px) 32px;flex-direction:column;align-items:center;display:flex;overflow-y:auto}.signin-wordmark{cursor:pointer;background:0 0;border:0;flex:none;padding:0;display:inline-flex}.signin-content{text-align:center;width:100%;max-width:400px;margin:auto 0;padding:40px 0}.signin-content h1{color:#101113;letter-spacing:-.048em;text-wrap:balance;margin:0;font-family:Bricolage Grotesque,Plus Jakarta Sans,sans-serif;font-size:clamp(2.3rem,3.3vw,3.1rem);font-weight:710;line-height:1}.signin-lead{text-wrap:balance;color:#46484c;max-width:320px;margin:16px auto 36px;font-size:1rem;line-height:1.55}.signin-google,.signin-guest,.signin-start{border-radius:14px;justify-content:center;align-items:center;gap:12px;width:100%;min-height:52px;padding:0 20px;font-size:.97rem;font-weight:600;transition:background-color .16s,border-color .16s;display:flex}.signin-google,.signin-start{color:#e3e3e3;background:#131314;border:1px solid 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32px}.signin-legal{margin-top:auto}.signin-content h1{font-size:clamp(2.3rem,10.6vw,3rem)}}@media (width<=1024px) and (height<=500px) and (orientation:landscape){.signin-page{grid-template-rows:none;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);overflow:hidden}.signin-art{background-position:60%}.signin-panel{padding:max(14px, env(safe-area-inset-top,0px)) max(24px, env(safe-area-inset-right,0px)) max(12px, env(safe-area-inset-bottom,0px)) 24px;border-radius:0;margin-top:0;overflow-y:auto}.signin-content{max-width:360px;margin:auto;padding:8px 0}.signin-content h1{font-size:2rem}.signin-lead{margin:8px auto 18px;font-size:.9rem}.signin-google,.signin-guest{min-height:44px}.signin-guest{margin-top:8px}.signin-legal{margin-top:0;font-size:.7rem}}@media (prefers-reduced-motion:reduce){.signin-google,.signin-guest,.signin-start,.welcome-field input,.welcome-level-option,.welcome-level-tick{transition:none}}.welcome-backdrop{z-index:190;padding:calc(16px + var(--safe-top)) 16px 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.16s,box-shadow .16s;display:block}.welcome-field input::placeholder{color:#a3a6ab}.welcome-field input:focus{border-color:var(--field-ring);box-shadow:0 0 0 3px var(--field-glow);outline:none}.welcome-field>span small{color:#9a9da3;letter-spacing:0;margin-left:0;font-family:Plus Jakarta Sans,sans-serif;font-size:.82rem;font-weight:500}.welcome-levels{gap:8px;display:grid}.welcome-level-option{color:#101113;width:100%;min-height:68px;font:inherit;text-align:left;cursor:pointer;background:#fff;border:1px solid #10111324;border-radius:16px;grid-template-columns:22px minmax(0,1fr) 22px;align-items:center;column-gap:16px;padding:12px 18px;transition:border-color .16s,background-color .16s,box-shadow .16s;display:grid}.welcome-level-bars{justify-content:center;align-items:flex-end;gap:3px;height:18px;font-style:normal;display:flex}.welcome-level-bars span{background:#dfe0e3;border-radius:2px;width:5px;height:7px}.welcome-level-bars span:nth-child(2){height:12px}.welcome-level-bars span:nth-child(3){height:18px}.welcome-level-bars span.on{background:#101113}.welcome-level-words{gap:2px;min-width:0;display:grid}.welcome-level-option b{font-size:1rem;font-weight:600;line-height:1.25}.welcome-level-option small{color:#8b8e94;font-size:.84rem;line-height:1.3}.welcome-level-tick{color:#0000;border:1.5px solid #10111333;border-radius:50%;place-items:center;width:22px;height:22px;font-style:normal;transition:background-color .16s,border-color .16s,color .16s;display:grid}.welcome-level-option:hover{border-color:#10111352}.welcome-level-option:focus-visible{border-color:var(--field-ring);box-shadow:0 0 0 3px var(--field-glow);outline:none}.welcome-level-option.chosen{color:#fff;box-shadow:none;background:#101113;border-color:#101113}.welcome-level-option.chosen small{color:#ffffffb8}.welcome-level-option.chosen .welcome-level-bars span{background:#ffffff40}.welcome-level-option.chosen .welcome-level-bars 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strong{color:#0f1012;font-weight:600}.ls-took{color:#9aa1ad;font-variant-numeric:tabular-nums;font-size:.72rem;font-weight:500;line-height:20px}.ls-srcs{flex-wrap:wrap;gap:6px;display:flex}.ls-src{color:#0f1012;background:#f4f5f7;border:1px solid #0f11140d;border-radius:999px;align-items:center;gap:7px;height:26px;padding:0 10px 0 4px;font-size:.75rem;font-weight:550;text-decoration:none;display:inline-flex}.ls-src:hover{background:#eceef1}.ls-src b{border-radius:6px;place-items:center;width:18px;height:18px;font-size:.62rem;font-weight:700;display:grid}.ls-thoughts{gap:2px;display:grid}.ls-thought{color:#0f1012;animation:.35s cubic-bezier(.22,1,.36,1) both ls-drop}.ls-facts{gap:4px;margin:0;padding:0;list-style:none;display:grid}.ls-facts li{padding-left:13px;position:relative}.ls-facts li:before{content:"";background:#9aa1ad;width:6px;height:1px;position:absolute;top:.72em;left:1px}@media (prefers-reduced-motion:reduce){.ls-line,.ls-line.is-leaving,.ls-panel,.ls-dots i,.ls-spin,.ls-what{animation:none}.ls-what{-webkit-text-fill-color:#0f1012}.ls-line.is-leaving{display:none}}