:root{--color-bg: #f4f4f4;--color-answer-bg:#eee;--color-muted: #777;--color-text: #333;--color-dark: #131313;--color-light: #ccc;--color-primary: #1e81b0;--color-success: #4caf50;--color-error: #f44336;--color-overlay: rgba(0, 0, 0, .5);--color-link: #007aff;--color-muted-light: #999}.text-xl{font-size:24px;font-weight:700}.text-lg{font-size:18px;font-weight:600}.text-base{font-size:16px;font-weight:400}.text-sm{font-size:13px;color:var(--color-muted-light)}html,body{overscroll-behavior-y:contain;height:100%;margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Arial,sans-serif;background-color:var(--color-bg);color:var(--color-text);overflow-y:auto}.app-wrapper{display:flex;flex-direction:column;align-items:center;height:100vh;padding:0 16px;box-sizing:border-box}.main-content{width:100%;max-width:400px;display:flex;flex-direction:column;align-items:center;flex-grow:1;padding-bottom:160px}.app-header{padding:12px 0 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