:root{--color-background:#f7f8fa;--color-surface:#fff;--color-text:#1f2937;--color-accent:#167c8d;--space-2:.5rem;--space-4:1rem;--space-6:1.5rem;--type-body:-apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--type-title:"PingFang SC", "Noto Sans CJK SC", var(--type-body)}*{box-sizing:border-box}body{background:var(--color-background);min-inline-size:20rem;color:var(--color-text);font-family:var(--type-body);margin:0}button,input,select,textarea{font:inherit}a{color:var(--color-accent)}.app-shell{gap:var(--space-6);min-height:100dvh;padding-block:var(--space-6) calc(var(--space-6) + env(safe-area-inset-bottom));padding-inline:var(--space-4);grid-template-rows:auto 1fr auto;inline-size:min(100%,32rem);margin-inline:auto;display:grid}.app-header 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