.sd-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:2rem;align-items:center;padding:1.5rem 0 1rem}.sd-hero-copy .sd-title{margin-top:.8rem;font-size:clamp(2.2rem,5vw,3.4rem);font-weight:800;letter-spacing:-.02em;color:var(--color-ink-900);line-height:1.05}.sd-lead{margin-top:1rem;max-width:34rem;font-size:1.05rem;line-height:1.7;color:var(--color-ink-500)}.sd-hero-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.5rem}.sd-hero-stats{display:flex;gap:2.2rem;margin:1.8rem 0 0;padding:0}.sd-hero-stats dt{font-size:.78rem;color:var(--color-ink-400)}.sd-hero-stats dd{margin:0;font-size:1.6rem;font-weight:800;color:var(--color-brand-700)}.sd-hero-art{position:relative;display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;max-width:20rem;margin-inline:auto}.sd-art-cell{aspect-ratio:1;display:grid;place-items:center;border-radius:1rem;background:linear-gradient(160deg,#fff,#f3f0ff);box-shadow:var(--shadow-soft);font-size:2.2rem;font-weight:800;font-family:var(--font-mono);color:var(--color-brand-700);animation:sd-float 3.4s ease-in-out infinite;animation-delay:var(--d)}.sd-art-grid{grid-column:1 / -1;text-align:center;font-weight:700;color:var(--color-ink-600);background:var(--color-brand-50);border-radius:.75rem;padding:.6rem;animation:sd-float 3.4s ease-in-out infinite;animation-delay:var(--d)}@keyframes sd-float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.sd-play{display:grid;grid-template-columns:16rem 1fr;gap:1.25rem;margin-top:1.5rem}.sd-settings{padding:1.25rem;align-self:start;position:sticky;top:5rem}.sd-set-title{display:flex;align-items:center;gap:.5rem;font-weight:700;color:var(--color-ink-800);margin-bottom:1rem}.sd-set-block{margin-bottom:1.1rem}.sd-set-label{display:block;font-size:.85rem;font-weight:600;color:var(--color-ink-600);margin-bottom:.5rem}.sd-seg{display:grid;grid-template-columns:repeat(3,1fr);gap:.4rem}.sd-seg-btn{padding:.45rem .2rem;border-radius:.7rem;border:1px solid var(--color-ink-200);background:#fff;color:var(--color-ink-600);font-size:.82rem;font-weight:600;cursor:pointer;transition:all .15s}.sd-seg-btn.is-active{background:var(--color-brand-600);border-color:var(--color-brand-600);color:#fff}.sd-diff-note{margin-top:.5rem;font-size:.78rem;color:var(--color-ink-400);line-height:1.5}.sd-set-toggle{display:flex;align-items:center;justify-content:space-between}.sd-switch{width:2.8rem;height:1.6rem;border-radius:999px;border:none;background:var(--color-ink-200);position:relative;cursor:pointer;transition:background .2s;flex-shrink:0}.sd-switch.is-on{background:var(--color-brand-500)}.sd-switch-knob{position:absolute;top:.2rem;left:.2rem;width:1.2rem;height:1.2rem;border-radius:50%;background:#fff;transition:transform .2s;box-shadow:0 1px 3px #0003}.sd-switch.is-on .sd-switch-knob{transform:translate(1.2rem)}.sd-start{width:100%;margin-top:.3rem}.sd-set-hint{margin-top:.7rem;font-size:.8rem;color:var(--color-ink-400);text-align:center}.sd-arena{padding:1.5rem;min-height:30rem;display:flex;flex-direction:column}.sd-arena-idle{margin:auto;text-align:center;display:flex;flex-direction:column;align-items:center;gap:.6rem}.sd-idle-icon{display:grid;place-items:center;width:4.5rem;height:4.5rem;border-radius:1.5rem;background:var(--color-brand-50);color:var(--color-brand-600)}.sd-idle-title{font-size:1.3rem;font-weight:700;color:var(--color-ink-800)}.sd-idle-sub{color:var(--color-ink-400);font-size:.9rem;margin-bottom:.5rem}.sd-arena-top{margin-bottom:1rem}.sd-meta-row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}.sd-meta{display:inline-flex;align-items:center;gap:.3rem;padding:.35rem .7rem;border-radius:.7rem;background:var(--color-ink-50);font-size:.85rem;font-weight:600;color:var(--color-ink-600)}.sd-meta b{color:var(--color-ink-800);font-family:var(--font-mono)}.sd-pause-btn{margin-left:auto;padding:.35rem .9rem;border-radius:.7rem;border:1px solid var(--color-ink-200);background:#fff;color:var(--color-ink-600);font-size:.82rem;font-weight:600;cursor:pointer}.sd-pause-btn.is-paused{color:var(--color-warm-600);border-color:var(--color-warm-200);background:var(--color-warm-50)}.sd-feedback{min-height:1.3rem;font-size:.92rem;font-weight:600;margin-top:.7rem;text-align:center;opacity:0;transition:opacity .2s}.sd-feedback.is-ok{opacity:1;color:var(--color-success)}.sd-feedback.is-err{opacity:1;color:var(--color-danger)}.sd-feedback.is-info{opacity:1;color:var(--color-brand-600)}.sd-board-wrap{position:relative;display:grid;place-items:center}.sd-board{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);width:100%;max-width:32rem;aspect-ratio:1;background:var(--color-ink-900);border:3px solid var(--color-ink-900);border-radius:.6rem;overflow:hidden;gap:1px;user-select:none;touch-action:manipulation}.sd-cell{position:relative;display:grid;place-items:center;background:#fff;font-size:clamp(1.1rem,4.2vw,1.7rem);font-weight:700;color:var(--color-brand-700);font-family:var(--font-mono);cursor:pointer;transition:background .12s}.sd-cell:hover{background:var(--color-brand-50)}.sd-cell[data-c="2"],.sd-cell[data-c="5"]{border-right:2px solid var(--color-ink-400)}.sd-cell[data-r="2"],.sd-cell[data-r="5"]{border-bottom:2px solid var(--color-ink-400)}.sd-cell.is-given{color:var(--color-ink-900);background:var(--color-ink-50);font-weight:800;cursor:default}.sd-cell.is-selected{background:var(--color-brand-100);box-shadow:inset 0 0 0 2px var(--color-brand-500)}.sd-cell.is-peer{background:var(--color-brand-50)}.sd-cell.is-same{background:#e9e3ff}.sd-cell.is-error{color:var(--color-danger)!important;background:#ffeaea}.sd-cell.is-hint{animation:sd-hintpulse 1.2s ease;color:var(--color-success)!important}@keyframes sd-hintpulse{0%{background:var(--color-success)}to{background:#fff}}.sd-notes{position:absolute;inset:0;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);padding:2px;pointer-events:none}.sd-note{display:grid;place-items:center;font-size:clamp(.5rem,1.8vw,.72rem);font-weight:600;color:var(--color-ink-400);font-family:var(--font-sans);line-height:1}.sd-note.is-done{visibility:hidden}.sd-win{position:absolute;inset:0;display:grid;place-items:center;background:#ffffffdb;backdrop-filter:blur(3px);border-radius:.6rem;animation:sd-fade .3s ease}@keyframes sd-fade{0%{opacity:0}to{opacity:1}}.sd-win-card{text-align:center;display:flex;flex-direction:column;align-items:center;gap:.6rem;padding:1.5rem}.sd-win-badge{display:inline-flex;align-items:center;gap:.4rem;padding:.4rem 1rem;border-radius:999px;background:linear-gradient(135deg,var(--color-brand-500),var(--color-brand-600));color:#fff;font-weight:700}.sd-win-title{font-size:1.3rem;font-weight:800;color:var(--color-ink-900)}.sd-win-sub{color:var(--color-ink-500)}.sd-win-sub b{color:var(--color-brand-700);font-family:var(--font-mono)}.sd-win-actions{display:flex;gap:.6rem;margin-top:.5rem;flex-wrap:wrap;justify-content:center}.sd-tool-row{display:grid;grid-template-columns:repeat(6,1fr);gap:.5rem;margin-top:1.1rem}.sd-tool{display:inline-flex;align-items:center;justify-content:center;gap:.25rem;padding:.6rem .2rem;border-radius:.8rem;border:1px solid var(--color-ink-200);background:#fff;color:var(--color-ink-600);font-size:.78rem;font-weight:600;cursor:pointer;transition:all .15s}.sd-tool:hover{border-color:var(--color-brand-300);color:var(--color-brand-700)}.sd-tool:active{transform:scale(.96)}.sd-tool.is-active{background:var(--color-brand-600);border-color:var(--color-brand-600);color:#fff}.sd-tool:disabled{opacity:.4;cursor:not-allowed}.sd-keypad{display:grid;grid-template-columns:repeat(5,1fr);gap:.5rem;margin-top:.7rem;max-width:32rem;margin-inline:auto;width:100%}.sd-key{aspect-ratio:1.4;border-radius:.9rem;border:1px solid var(--color-brand-100);background:var(--color-brand-50);color:var(--color-brand-700);font-size:1.4rem;font-weight:700;font-family:var(--font-mono);cursor:pointer;transition:all .15s;display:grid;place-items:center}.sd-key:hover{background:var(--color-brand-100)}.sd-key:active{transform:scale(.94)}.sd-key.is-done{opacity:.35}.sd-key-erase{color:var(--color-danger);background:#ffeaea;border-color:transparent}.sd-remain{display:grid;grid-template-columns:repeat(9,1fr);gap:.35rem;margin-top:.9rem;max-width:32rem;margin-inline:auto;width:100%}.sd-remain-item{text-align:center;padding:.3rem 0;border-radius:.5rem;background:var(--color-ink-50);font-size:.78rem;font-weight:700;color:var(--color-ink-600);font-family:var(--font-mono)}.sd-remain-item.is-zero{color:var(--color-ink-300)}.sd-section{margin-top:3.5rem}.sd-section-head{display:flex;flex-direction:column;gap:.4rem;margin-bottom:1.25rem}.sd-section-sub{color:var(--color-ink-500);font-size:.95rem}.sd-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.sd-step{padding:1.4rem;position:relative}.sd-step-num{display:grid;place-items:center;width:2.2rem;height:2.2rem;border-radius:.7rem;background:linear-gradient(135deg,var(--color-brand-500),var(--color-brand-600));color:#fff;font-weight:800;font-family:var(--font-mono);margin-bottom:.8rem}.sd-step-title{font-weight:700;color:var(--color-ink-900);margin-bottom:.4rem}.sd-step-desc{font-size:.9rem;color:var(--color-ink-500);line-height:1.6}.sd-skill-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.sd-skill{padding:1.25rem}.sd-skill-title{font-weight:700;color:var(--color-ink-900);margin-bottom:.4rem}.sd-skill-desc{font-size:.88rem;color:var(--color-ink-500);line-height:1.6}.sd-faq{display:flex;flex-direction:column;gap:.6rem}.sd-faq-item{border:1px solid var(--color-white, #fff);background:#ffffffd9;border-radius:var(--radius-sm);box-shadow:var(--shadow-soft);overflow:hidden}.sd-faq-item summary{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 1.2rem;cursor:pointer;font-weight:600;color:var(--color-ink-800);list-style:none}.sd-faq-item summary::-webkit-details-marker{display:none}.sd-faq-caret{color:var(--color-ink-400);transition:transform .2s;flex-shrink:0}.sd-faq-item[open] .sd-faq-caret{transform:rotate(180deg)}.sd-faq-body{padding:0 1.2rem 1.1rem;color:var(--color-ink-500);font-size:.92rem;line-height:1.7}@media(max-width:900px){.sd-hero{grid-template-columns:1fr}.sd-hero-art{display:none}.sd-play{grid-template-columns:1fr}.sd-settings{position:static}.sd-steps{grid-template-columns:1fr}.sd-skill-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:560px){.sd-skill-grid{grid-template-columns:1fr}.sd-tool-row{grid-template-columns:repeat(3,1fr)}.sd-arena{padding:1rem}.sd-seg{grid-template-columns:repeat(3,1fr)}}