:root{--bg: #f6f5f1;--surface: #ffffff;--ink: #1b2430;--muted: #586374;--line: #d9dde3;--brand: #1f3a5f;--brand-ink: #ffffff;--accent: #2f6db5;--hard: #c2410c;--ok: #a16207;--easy: #15803d;--none: #9aa3af;--hint-bg: #eef4fb;--answer-bg: #f3f7ef;--danger: #b42318;--radius: 14px;--tap: 48px;color-scheme:light dark;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,Hiragino Sans,Helvetica Neue,system-ui,sans-serif;-webkit-text-size-adjust:100%;text-size-adjust:100%}@media(prefers-color-scheme:dark){:root{--bg: #0f141a;--surface: #18202a;--ink: #eef1f5;--muted: #a7b0bd;--line: #2c3744;--brand: #9cc3ff;--brand-ink: #0f141a;--accent: #8ab8ff;--hard: #fb923c;--ok: #facc15;--easy: #4ade80;--none: #6b7280;--hint-bg: #16263a;--answer-bg: #18291d;--danger: #f87171}}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink)}body{min-height:100dvh;-webkit-tap-highlight-color:transparent}button,select,input{font:inherit;color:inherit}:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.app{max-width:560px;margin:0 auto;min-height:100dvh;padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}.screen{padding:calc(env(safe-area-inset-top) + 4px) 16px calc(env(safe-area-inset-bottom) + 16px)}.topbar{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:8px;min-height:52px;position:sticky;top:0;z-index:5;background:var(--bg);padding-top:env(safe-area-inset-top);margin-top:calc(-1*env(safe-area-inset-top))}.home .topbar{grid-template-columns:1fr auto}.app-title{font-size:1.35rem;margin:0;color:var(--brand);letter-spacing:.01em}.topbar-label{text-align:center;font-weight:600;font-size:.98rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar-pos{font-variant-numeric:tabular-nums;color:var(--muted);min-width:3.5em;text-align:right}.btn{min-height:var(--tap);min-width:var(--tap);border-radius:12px;border:1px solid var(--line);background:var(--surface);padding:0 16px;font-size:1rem;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:6px;touch-action:manipulation}.btn:disabled{opacity:.45;cursor:default}.btn-primary{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}.btn-secondary{background:var(--surface)}.btn-ghost{background:transparent;border-color:transparent;color:var(--accent);padding:0 8px}.btn-danger{color:var(--danger);border-color:var(--danger);background:transparent}.btn-small{min-height:44px;font-size:.9rem;padding:0 12px}.btn-wide{width:100%}.btn-col{display:grid;gap:10px}.btn-row{display:flex;gap:10px;flex-wrap:wrap}.file-label{position:relative}.select{width:100%;min-height:var(--tap);border-radius:12px;border:1px solid var(--line);background:var(--surface);padding:0 12px;font-size:1rem}.pack-row{margin:4px 0 12px}.summary{color:var(--muted);margin:8px 2px 0;font-size:.92rem}.type-grid{display:grid;gap:10px}.type-tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.type-main{display:flex;align-items:baseline;gap:10px;width:100%;min-height:52px;padding:10px 14px 6px;border:0;background:transparent;text-align:left;cursor:pointer}.type-id{font-weight:700;color:var(--muted);font-variant-numeric:tabular-nums}.type-name{font-size:1.12rem;font-weight:700}.type-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;padding:0 10px 10px}.dot-btn{min-height:var(--tap);border-radius:10px;border:2px solid var(--none);background:transparent;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4px 2px;cursor:pointer;line-height:1.15}.dot-letter{font-weight:800}.dot-sub{font-size:.72rem;color:var(--muted)}.dot-hard{border-color:var(--hard);background:color-mix(in srgb,var(--hard) 14%,transparent)}.dot-ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,transparent)}.dot-easy{border-color:var(--easy);background:color-mix(in srgb,var(--easy) 16%,transparent)}.home-actions{display:grid;gap:12px;margin-top:16px}.segmented{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:12px;overflow:hidden}.segmented button{min-height:44px;border:0;background:var(--surface);cursor:pointer;font-weight:600}.segmented button[aria-pressed=true]{background:var(--brand);color:var(--brand-ink)}.legend{font-size:.85rem;color:var(--muted);display:flex;flex-wrap:wrap;align-items:center;gap:4px 6px;margin:0}.dot-sample{display:inline-block;width:12px;height:12px;border-radius:50%;border:2px solid var(--none);margin-left:6px}.practice{padding-bottom:calc(env(safe-area-inset-bottom) + 140px)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px 16px;box-shadow:0 1px 2px #0000000a}.card-meta{display:flex;justify-content:space-between}.card-id{font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:.85rem;background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:2px 8px;letter-spacing:.03em;-webkit-user-select:all;user-select:all}.card-title{margin:10px 0 4px;font-size:1.05rem;color:var(--muted);font-weight:600}.label{font-size:.72rem;letter-spacing:.1em;font-weight:700;color:var(--muted);margin:12px 0 4px}.question{font-size:1.28rem;line-height:1.4;font-weight:650;margin:0}.facts{margin:0;padding-left:1.2em;font-size:1.08rem;line-height:1.5}.facts li+li{margin-top:2px}.assist{margin-top:12px;display:grid;gap:10px}.hint-buttons{display:grid;grid-template-columns:1fr 1fr;gap:8px}.btn-hint small{font-weight:500;color:var(--muted);font-size:.78rem}.hint,.answer{border-radius:var(--radius);padding:4px 14px 12px;line-height:1.5}.hint{background:var(--hint-bg)}.hint ul{margin:4px 0 0;padding-left:1.2em}.answer{background:var(--answer-bg)}.sample{font-size:1.05rem;margin-top:0}.btn-answer{border-style:dashed;color:var(--muted)}.atsu-list{margin:0;padding-left:1.1em}.atsu-id{font-family:ui-monospace,Menlo,monospace;font-size:.8rem;color:var(--muted)}.note{font-size:.88rem;color:var(--muted)}.bottombar{position:fixed;left:0;right:0;bottom:0;z-index:10;background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:8px max(16px,env(safe-area-inset-right)) calc(env(safe-area-inset-bottom) + 8px) max(16px,env(safe-area-inset-left))}.bottombar>*{max-width:528px;margin-left:auto;margin-right:auto}.rating{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.rate{min-height:var(--tap);border-radius:12px;border:2px solid var(--line);background:var(--surface);font-weight:700;cursor:pointer}.rate-hard[aria-pressed=true]{border-color:var(--hard);background:color-mix(in srgb,var(--hard) 18%,var(--surface))}.rate-ok[aria-pressed=true]{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 18%,var(--surface))}.rate-easy[aria-pressed=true]{border-color:var(--easy);background:color-mix(in srgb,var(--easy) 18%,var(--surface))}.nav{display:grid;grid-template-columns:1fr 1.4fr;gap:8px;margin-top:8px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:4px 16px 16px;margin-top:12px;line-height:1.55}.panel h2{font-size:1.05rem;margin:12px 0 6px}.warn{color:var(--hard);font-size:.92rem}.banner{background:var(--hint-bg);border-radius:12px;padding:10px 14px;margin:8px 0}.banner-error{background:color-mix(in srgb,var(--danger) 18%,var(--surface));margin:8px 16px}.pack-list{list-style:none;padding:0;margin:8px 0 12px}.pack-list li{display:flex;justify-content:space-between;align-items:center;gap:8px;min-height:48px;border-bottom:1px solid var(--line)}.preview{margin-top:12px;border:1px dashed var(--line);border-radius:12px;padding:4px 12px 12px}.preview-list{font-size:.9rem;max-height:260px;overflow:auto;padding-left:1.4em}.errors{color:var(--danger);font-size:.88rem}.footnote{text-align:center;color:var(--muted);font-size:.8rem;margin-top:20px}