:root{color-scheme:light;font-family:Segoe UI,Hiragino Sans,sans-serif;line-height:1.5;font-weight:400;background:#f6f7fb;color:#1d2433;--panel-bg: #ffffff;--border: #d6dbe7;--accent: #1d6ef2;--accent-pressed: #1557c2;--muted: #667189;--danger: #c03434}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at top,rgba(29,110,242,.08),transparent 35%),#f6f7fb}button,input,select{font:inherit}.app-shell{max-width:960px;margin:0 auto;padding:16px}.topbar{margin-bottom:16px}.topbar h1{margin:0;font-size:1.5rem}.subtitle{margin:8px 0 0;color:var(--muted);font-size:.95rem}.layout{display:grid;gap:16px}.panel{background:var(--panel-bg);border:1px solid var(--border);border-radius:16px;padding:16px;box-shadow:0 10px 30px #121f350f}.controls-panel{display:grid;gap:16px}.field-group{display:grid;gap:8px}.field-row{display:grid;gap:12px}.field-group label{font-weight:600}.field-group input[type=file],.field-group input[type=password],.field-group select{width:100%;padding:12px;border:1px solid var(--border);border-radius:12px;background:#fff}.helper-text{margin:0;color:var(--muted);font-size:.9rem}.button-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.secondary-row{grid-template-columns:1fr}.button-row button{border:none;border-radius:999px;min-height:48px;padding:0 16px;background:var(--accent);color:#fff;font-weight:600}.button-row button:hover:not(:disabled){background:var(--accent-pressed)}.button-row button:disabled{opacity:.45}.secondary-button{background:#edf2ff!important;color:#21457d!important}.secondary-button:hover:not(:disabled){background:#dfe9ff!important}.status-block{display:grid;gap:8px}.status-message,.error-message{min-height:1.4em;margin:0;font-size:.95rem}.status-message{color:var(--muted)}.error-message{color:var(--danger)}.phrase-panel{min-height:320px;display:flex;align-items:center;justify-content:center}.phrase-card{width:100%;text-align:center;display:grid;gap:20px}.english-text{margin:0;font-size:clamp(1.4rem,5vw,2rem);font-weight:700;line-height:1.25;word-break:break-word}.japanese-text{margin:0;font-size:clamp(1.1rem,4vw,1.5rem);color:#42506a;word-break:break-word}.empty-state{margin:0;text-align:center;color:var(--muted)}.hidden{display:none}.fatal-error{padding:24px;color:var(--danger)}@media(min-width:768px){.layout{grid-template-columns:minmax(300px,360px) 1fr;align-items:start}.field-row{grid-template-columns:repeat(2,1fr)}}