:root{color:#27334d;font-synthesis:none;--ink:#27334d;--muted:#68738c;--cream:#fffaf0;--purple:#7458d6;--purple-dark:#5940b7;--green:#20a779;--red:#e45b65;--line:#dfe5f1;background:#dcecff;font-family:Hiragino Maru Gothic ProN,Yu Gothic,Meiryo,sans-serif}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{background:radial-gradient(circle at 12% 18%,#ffffffbf 0 8%,#0000 9%),linear-gradient(145deg,#dcedff 0%,#f5eaff 48%,#fff1d9 100%);min-width:320px;min-height:100dvh;overflow-x:hidden}button{font:inherit}button:focus-visible{outline-offset:3px;outline:4px solid #162843}.page-decoration{z-index:0;opacity:.45;filter:blur(1px);pointer-events:none;border-radius:50%;width:220px;height:220px;position:fixed}.decoration-one{background:#7fd6ff;top:-70px;left:-70px}.decoration-two{background:#ffc97f;bottom:-70px;right:-80px}.app-shell{z-index:1;background:var(--cream);width:min(100%,520px);min-height:100dvh;margin:0 auto;position:relative;overflow:hidden;box-shadow:0 0 50px #3647702e}.screen{min-height:100dvh;padding:max(22px, env(safe-area-inset-top)) 22px max(24px, env(safe-area-inset-bottom))}.screen.is-hidden{display:none}.home-screen-content{flex-direction:column;justify-content:center;min-height:calc(100dvh - 46px);display:flex}.eyebrow{color:var(--purple-dark);letter-spacing:.08em;text-align:center;margin:0 0 7px;font-size:.85rem;font-weight:800}.title-lockup{text-align:center;margin:0 auto 12px;position:relative}.title-lockup h1{color:var(--ink);letter-spacing:.03em;margin:0;font-size:clamp(2rem,9vw,3.1rem);line-height:1.1}.title-highlight{color:var(--purple);display:inline-block;position:relative}.title-highlight:after{content:"";background:#ffd557;border-radius:999px;height:7px;position:absolute;bottom:-5px;left:2px;right:2px;transform:rotate(-1.5deg)}.subtitle{color:var(--muted);text-align:center;margin:0 0 9px;font-size:.95rem;font-weight:700}.time-attack-badge{width:max-content;color:var(--purple-dark);background:#f1edff;border:2px solid #d9d0f8;border-radius:999px;margin:0 auto 16px;padding:6px 12px;font-size:.78rem;font-weight:900}.mini-equation{justify-content:center;align-items:center;gap:8px;margin:0 auto 25px;display:flex}.mini-number,.mini-answer{border-radius:16px;place-items:center;width:54px;height:54px;font-size:1.55rem;font-weight:900;display:grid;box-shadow:0 5px #27334d1f}.mini-number:first-child{background:#bdeaff}.mini-number:nth-child(3){background:#ffd6a7}.mini-answer{background:#ccefc5}.math-sign{color:var(--muted);font-size:1.4rem;font-weight:900}.section-label{text-align:center;margin:0 0 10px;font-size:.9rem;font-weight:900}.difficulty-list{gap:11px;display:grid}.difficulty-button{width:100%;min-height:88px;color:var(--ink);cursor:pointer;text-align:left;background:#fff;border:2px solid #0000;border-radius:20px;grid-template-columns:48px 1fr auto;align-items:center;padding:11px 14px;transition:transform .14s,box-shadow .14s,border-color .14s;display:grid;box-shadow:0 7px 18px #2d3e621a}.difficulty-button:hover{border-color:var(--purple);transform:translateY(-2px);box-shadow:0 9px 22px #2d3e6226}.difficulty-button:active{transform:translateY(1px);box-shadow:0 4px 10px #2d3e621f}.difficulty-icon{width:42px;height:42px;color:var(--purple-dark);background:#ebe5ff;border-radius:14px;place-items:center;font-size:1.3rem;display:grid}.difficulty-copy{gap:3px;display:grid}.difficulty-name{font-size:1.08rem;font-weight:900}.difficulty-range{color:var(--muted);font-size:.78rem;font-weight:700}.difficulty-best{color:#4c5872;font-size:.7rem;font-weight:800}.difficulty-arrow{color:var(--purple);font-size:1.45rem;font-weight:900}.text-button{color:var(--purple-dark);cursor:pointer;text-underline-offset:4px;background:0 0;border:0;align-self:center;margin:19px auto 0;padding:10px 15px;font-size:.9rem;font-weight:800;text-decoration:underline;text-decoration-thickness:2px}.game-layout{flex-direction:column;min-height:calc(100dvh - 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40px);margin:0 auto;padding:11px 17px;font-size:.78rem;font-weight:800;transition:opacity .18s,transform .18s;position:fixed;bottom:20px;left:20px;right:20px;transform:translateY(12px);box-shadow:0 8px 25px #1920373d}.toast.is-visible{opacity:1;transform:translateY(0)}@keyframes card-pop{0%{transform:scale(.85)}55%{transform:scale(1.08)rotate(1deg)}to{transform:scale(1)}}@keyframes card-shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}50%{transform:translate(6px)}75%{transform:translate(-3px)}}@keyframes sparkle{0%{opacity:.55;transform:translateY(2px)scale(.95)}to{opacity:1;transform:translateY(-2px)scale(1.05)}}@keyframes target-arrive{0%{opacity:.2;transform:scale(.68)rotate(-5deg)}70%{opacity:1;transform:scale(1.1)rotate(2deg)}to{opacity:1;transform:scale(1)rotate(0)}}@keyframes feedback-pop{0%{opacity:.3;transform:scale(.94)}to{opacity:1;transform:scale(1)}}@media (width>=700px){body{padding:24px 0}.app-shell,.screen{min-height:calc(100dvh - 48px)}.app-shell{border-radius:32px}.home-screen-content,.game-layout,.result-layout,.settings-layout{min-height:calc(100dvh - 94px)}}@media (height<=650px){.screen{padding-top:14px;padding-bottom:14px}.target-area{margin:10px 0 6px}.target-number{border-width:5px;width:78px;height:78px;font-size:2.3rem}.number-card{min-height:56px}.board-note{margin-top:10px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}