:root{--sky:#3d7bd8;--sky-deep:#2f66ba;--sky-tint:#e6f2fb;--gold:#f4c242;--gold-tint:#fff1c9;--sun:#f26a1b;--sun-deep:#d6560d;--sun-tint:#ffe8d6;--leaf:#6fae2e;--leaf-tint:#e9f4d8;--cream:#fff6e6;--paper:#fff;--ink:#2b1d12;--ink-soft:#2b1d129e;--ink-faint:#2b1d121f;--floor:#fbf4e4;--mine:#ffd233;--font:"Hiragino Maru Gothic ProN", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;--r-lg:20px;--r-md:14px;--r-sm:10px;--r-pill:999px;--shadow-card:0 6px 18px #2b1d121a}*{box-sizing:border-box}html,body{background:var(--cream);color:var(--ink);font-family:var(--font);margin:0;font-size:15px;line-height:1.5}button,input,select,textarea{font:inherit;color:inherit}.st-app{max-width:1200px;margin:0 auto;padding:12px 16px 48px}.st-top{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:8px 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6px;font-size:12px;font-weight:800}.st-row{border-radius:var(--r-md);text-align:left;cursor:pointer;background:0 0;border:0;align-items:center;gap:10px;width:100%;padding:8px 10px;display:flex}.st-row:hover{background:var(--paper)}.st-row.is-on{background:var(--paper);box-shadow:var(--shadow-card)}.st-ava{background:var(--sun-tint);border-radius:12px;flex:none;width:40px;height:40px;overflow:hidden}.st-ava img,.st-ava .face-svg,.st-ava .face-svg svg{object-fit:cover;width:100%;height:100%;display:block}.st-ava-l{border-radius:16px;width:56px;height:56px}.st-row-main{flex:1;min-width:0;display:grid}.st-row-name{white-space:nowrap;text-overflow:ellipsis;font-weight:800;overflow:hidden}.st-row-sub{color:var(--ink-soft);font-size:12px}.st-row-side{flex-wrap:wrap;flex:none;justify-content:flex-end;gap:4px;max-width:120px;display:flex}.st-pill{border-radius:var(--r-pill);background:var(--sky-tint);color:var(--sky-deep);white-space:nowrap;padding:1px 8px;font-size:11px;font-weight:800}.st-pill-friend{background:var(--leaf-tint);color:#2f6b12}.st-pill-draft{background:var(--gold-tint);color:#8a5a00}.st-pane{border-radius:var(--r-lg);background:var(--paper);min-width:0;box-shadow:var(--shadow-card);padding:16px}.st-pane-head{align-items:center;gap:12px;display:flex}.st-h2{margin:0;font-size:22px;font-weight:800}.st-pane-sub{color:var(--ink-soft);margin:0;font-size:13px}.st-tabs{border-bottom:2px solid var(--ink-faint);gap:6px;margin:14px 0 12px;display:flex;overflow-x:auto}.st-tab{color:var(--ink-soft);cursor:pointer;background:0 0;border:0;border-bottom:3px solid #0000;flex:none;align-items:center;gap:6px;margin-bottom:-2px;padding:8px 12px;font-weight:800;display:inline-flex}.st-tab.is-on{color:var(--ink);border-bottom-color:var(--sun)}.st-tab-n{border-radius:var(--r-pill);background:var(--gold-tint);min-width:20px;color:var(--ink);text-align:center;padding:0 6px;font-size:12px}.st-h3{margin:0 0 8px;font-size:15px;font-weight:800}.st-help{color:var(--ink-soft);margin:6px 0 0;font-size:12px;font-weight:700}.st-empty{text-align:center;color:var(--ink-soft);margin:24px 0;font-weight:700}.st-error{border-radius:var(--r-sm);background:var(--sun-tint);color:var(--sun-deep);margin:8px 0 0;padding:8px 12px;font-size:13px;font-weight:800}.st-editing{color:#8a5a00;margin:0 0 8px;font-size:12px;font-weight:800}.st-compose{grid-template-columns:1fr;gap:20px;display:grid}.st-kinds{flex-wrap:wrap;gap:8px;margin-bottom:12px;display:flex}.st-chip{border:2px solid var(--ink-faint);border-radius:var(--r-pill);background:var(--paper);cursor:pointer;min-height:38px;padding:0 16px;font-weight:800}.st-chip.is-on{background:var(--ink);border-color:var(--ink);color:#fff}.st-field{color:var(--ink-soft);gap:4px;margin-bottom:12px;font-size:13px;font-weight:800;display:grid}.st-field input,.st-field textarea{border:2px solid var(--ink-faint);border-radius:var(--r-sm);background:var(--paper);width:100%;min-height:44px;color:var(--ink);padding:8px 12px;font-weight:700}.st-field textarea{resize:vertical}.st-field input:focus,.st-field textarea:focus{border-color:var(--sky);outline:none}.st-field-row{grid-template-columns:1fr 1fr;gap:10px;display:grid}.st-actions{flex-wrap:wrap;gap:8px;margin-top:8px;display:flex}.st-btn{border:2px solid var(--sky);border-radius:var(--r-pill);background:var(--paper);min-height:44px;color:var(--sky-deep);cursor:pointer;padding:0 18px;font-weight:800}.st-btn:hover{background:var(--sky-tint)}.st-btn-main{background:var(--sun);border-color:var(--sun);color:#fff}.st-btn-main:hover{background:var(--sun-deep);border-color:var(--sun-deep)}.st-btn-quiet{border-color:var(--ink-faint);color:var(--ink-soft)}.st-btn-quiet:hover{background:var(--cream)}.st-btn-small{min-height:34px;padding:0 12px;font-size:13px}.st-reply-head{justify-items:start;gap:8px;margin-bottom:12px;display:grid}.st-quote{border-left:4px solid var(--mine);background:var(--gold-tint);border-radius:6px;margin:0;padding:8px 12px;font-weight:700}.st-compose-preview{border-radius:var(--r-md);background:var(--floor);padding:14px}.pv{flex-direction:column;align-items:flex-start;display:flex}.pv-sender{color:var(--ink-soft);margin:0 0 3px 6px;font-size:12px;font-weight:800}.pv-line{align-items:flex-end;gap:6px;max-width:100%;display:flex}.pv-bubble{background:var(--paper);overflow-wrap:anywhere;border-radius:6px 18px 18px;max-width:300px;padding:10px 14px;font-size:15px;font-weight:700;line-height:1.5;box-shadow:0 1px 2px #2b1d1214}.pv-meta{color:var(--ink-soft);white-space:nowrap;padding-bottom:2px;font-size:11px;font-weight:700}.pv-kind{color:var(--sky-deep);align-items:center;gap:4px;margin:0;font-size:11px;font-weight:800;display:flex}.pv-date{margin:2px 0 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8px;font-size:12px}.st-letters,.st-notices{gap:8px;margin:8px 0 0;padding:0;list-style:none;display:grid}.st-letter{border-radius:var(--r-md);background:var(--floor);grid-template-columns:auto 1fr auto;align-items:center;gap:10px;padding:10px 12px;display:grid}.st-letter-time{color:var(--ink-soft);white-space:nowrap;font-size:12px;font-weight:800}.st-letter-text{overflow-wrap:anywhere;font-weight:700}.st-letter-act{align-items:center;gap:6px;display:flex}.st-notice{border-radius:var(--r-md);background:var(--floor);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;display:flex}.st-notice-main{min-width:0;display:grid}.st-notice-kind{color:var(--sky-deep);font-size:11px;font-weight:800}.st-notice-title{overflow-wrap:anywhere;font-weight:800}.st-notice-time{color:var(--ink-soft);font-size:12px}.st-notice-act{flex-wrap:wrap;gap:6px;display:flex}.st-toast{border-radius:var(--r-pill);background:var(--ink);color:#fff;box-shadow:var(--shadow-card);z-index:10;margin:0;padding:10px 18px;font-weight:800;position:fixed;bottom:24px;left:50%;translate:-50%}@media (max-width:599px){.st-letter{grid-template-columns:1fr;gap:4px}}@media (min-width:900px){.st-main{grid-template-columns:300px 1fr;align-items:start}.st-select-wrap{display:none}.st-list{max-height:calc(100vh - 180px);padding:4px 4px 4px 0;display:block;position:sticky;top:12px;overflow-y:auto}.st-compose{grid-template-columns:1fr 360px}}