:root{--paper:#fafaf7;--card:#fff;--ink:#1a2433;--muted:#5a6a7e;--line:#e3e6ec;--rail:#1b4f9c;--rail-strong:#143c77;--rail-soft:#eaf1f9;--amber:#f5a623;--amber-deep:#e07f00;--amber-soft:#fdf1da;--night:#2c3a4e;--radius:14px;--shadow:0 1px 2px #1420360f, 0 8px 24px #14203612}@media (prefers-color-scheme:dark){:root{--paper:#0e1622;--card:#16202e;--ink:#e8edf4;--muted:#9aa9bc;--line:#26344a;--rail:#6fa3e8;--rail-strong:#8db8f0;--rail-soft:#1c2a3d;--amber:#ffb94d;--amber-deep:#ffa726;--amber-soft:#33270f;--night:#0a101a;--shadow:0 1px 2px #0006, 0 8px 24px #00000059}}*{box-sizing:border-box}[hidden]{display:none!important}html{color-scheme:light dark;background:var(--paper)}body{background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased;margin:0;font-family:Noto Sans TC,PingFang TC,Microsoft JhengHei,Hiragino Sans,Yu Gothic UI,system-ui,sans-serif;line-height:1.65}main{max-width:640px;margin:0 auto;padding:0 16px 48px}.site-head{max-width:640px;margin:0 auto;padding:28px 16px 20px}.brand{align-items:baseline;gap:10px;margin:0;display:flex}.brand-mark{letter-spacing:.06em;color:var(--rail);font-size:2rem;font-weight:900}.brand-kana{color:var(--muted);letter-spacing:.35em;font-size:.85rem}.brand-sub{margin:2px 0 0;font-size:1.05rem;font-weight:700}.brand-line{color:var(--muted);margin:2px 0 0;font-size:.85rem}.mode-tabs{background:var(--paper);border:1.5px solid var(--line);border-radius:12px;grid-template-columns:1fr 1fr;gap:4px;margin-bottom:14px;padding:4px;display:grid}.mode-tab{font:inherit;min-height:42px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:9px;font-size:.92rem;font-weight:700}.mode-tab[aria-selected=true]{background:var(--rail);color:#fff}@media (prefers-color-scheme:dark){.mode-tab[aria-selected=true]{color:#0e1622}}.rail-status{margin:6px 0 10px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}.field-line{margin-bottom:12px}.stations{grid-template-columns:1fr auto 1fr;align-items:end;gap:8px;display:grid}.when{grid-template-columns:1fr 1fr;gap:8px;margin-top:12px;display:grid}.when .field:last-child{grid-column:1/-1}@media (width>=520px){.when{grid-template-columns:1fr 1fr 1.4fr}.when .field:last-child{grid-column:auto}}.field{min-width:0;display:block}.field-label{color:var(--muted);letter-spacing:.04em;margin-bottom:4px;font-size:.78rem;font-weight:700;display:block}select,input[type=date],input[type=time],input[type=search],textarea{width:100%;font:inherit;color:var(--ink);background:var(--paper);border:1.5px solid var(--line);border-radius:10px;min-height:46px;padding:10px 12px;font-size:1rem}select:focus-visible,input:focus-visible,textarea:focus-visible,button:focus-visible{outline:2.5px solid var(--rail);outline-offset:2px}.swap{border:1.5px solid var(--line);background:var(--paper);min-width:46px;min-height:46px;color:var(--rail);cursor:pointer;border-radius:10px;font-size:1.2rem}.swap:active{transform:scale(.94)}.submit{background:var(--rail);color:#fff;width:100%;min-height:50px;font:inherit;letter-spacing:.08em;cursor:pointer;border:0;border-radius:12px;margin-top:14px;font-size:1.05rem;font-weight:700}.submit:hover{background:var(--rail-strong)}@media (prefers-color-scheme:dark){.submit{color:#0e1622}}.form-error{color:#c23b22;margin:10px 0 0;font-size:.9rem;font-weight:600}#result{margin-top:20px}.verdict-card{border-radius:var(--radius);border:1px solid var(--line);background:var(--card);box-shadow:var(--shadow);overflow:hidden}@media (prefers-reduced-motion:no-preference){.verdict-card{animation:.35s ease-out rise}@keyframes rise{0%{opacity:0;transform:translateY(8px)}}}.verdict-head{border-bottom:1px solid var(--line);background:linear-gradient(135deg, var(--rail-soft), transparent 65%);padding:20px 18px 14px}.verdict-route{color:var(--muted);margin:0 0 6px;font-size:.85rem}.verdict-main{margin:0;font-size:clamp(1.7rem,7vw,2.3rem);font-weight:900;line-height:1.25}.verdict-main .seat-letter{color:var(--rail);padding:0 2px;font-size:1.15em}.verdict-sub{color:var(--muted);margin:6px 0 0;font-size:.92rem}.verdict-note{color:var(--rail);margin:8px 0 0;font-size:.85rem;font-weight:600}.chips{flex-wrap:wrap;gap:6px;padding:12px 18px;display:flex}.chip{background:var(--rail-soft);color:var(--ink);font-variant-numeric:tabular-nums;border-radius:999px;padding:4px 10px;font-size:.8rem;font-weight:600}.chip.sun{background:var(--amber-soft)}.verdict-body{padding:4px 18px 20px}.verdict-body h3{color:var(--muted);letter-spacing:.08em;margin:18px 0 8px;font-size:.85rem}.diagram-wrap svg,.timeline-wrap svg{width:100%;height:auto;display:block}@media (prefers-reduced-motion:no-preference){.sun-glyph{transform-origin:50%;transform-box:fill-box;animation:3.2s ease-in-out infinite breathe}@keyframes breathe{50%{transform:scale(1.12)}}}.legend{color:var(--muted);flex-wrap:wrap;gap:14px;margin-top:6px;font-size:.78rem;display:flex}.legend i{vertical-align:-1px;border-radius:3px;width:12px;height:12px;margin-right:5px;font-style:normal;display:inline-block}.about{margin-top:32px;padding:0 4px}.about h2{letter-spacing:.06em;color:var(--rail);margin:22px 0 6px;font-size:1rem}.about p{color:var(--ink);margin:0 0 8px;font-size:.92rem}.note{color:var(--muted);font-size:.82rem}.site-foot{border-top:1px solid var(--line);max-width:640px;color:var(--muted);margin:0 auto;padding:20px 20px 40px;font-size:.85rem}.feedback-open{font:inherit;color:var(--rail);border:1.5px solid var(--rail);cursor:pointer;background:0 0;border-radius:999px;margin-bottom:12px;padding:7px 18px;font-weight:700}dialog{border-radius:var(--radius);background:var(--card);color:var(--ink);box-shadow:var(--shadow);border:0;width:min(92vw,420px);padding:20px}dialog::backdrop{background:#0a101a8c}dialog h2{margin:0 0 12px;font-size:1.1rem}dialog .field{margin-bottom:10px}.dialog-actions{gap:8px;margin-top:14px;display:flex}.dialog-actions .submit{flex:1;margin-top:0}.ghost{font:inherit;border:1.5px solid var(--line);color:var(--muted);cursor:pointer;background:0 0;border-radius:12px;min-height:50px;padding:0 18px}.hp{opacity:0;width:1px;height:1px;position:absolute;left:-9999px}