:root{--bg:#f4f6f8;--surface:#fff;--soft:#f7f9fb;--text:#1f2933;--muted:#667085;--line:#e4e7ec;--accent:#165d9c;--accent-soft:#eaf3fb;--danger:#b42318;--shadow:0 5px 20px rgba(16,24,40,.06)}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Helvetica Neue","Hiragino Sans","Yu Gothic",Meiryo,sans-serif}a{color:inherit}button,input,select,textarea{font:inherit}.app-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:calc(14px + env(safe-area-inset-top)) 18px 14px;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.app-header>div{flex:1;min-width:0}.app-header h1{margin:2px 0 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