.app{background:#f6f4f1;font-family:-apple-system,BlinkMacSystemFont,sans-serif;min-height:100vh;padding:24px}.header{margin-bottom:32px}.header h1{font-size:28px;font-weight:700}.tagline{color:#666;font-size:14px}.feed{display:flex;flex-direction:column;gap:20px}.card{background:#fff;border-radius:16px;box-shadow:0 4px 20px #0000000f;overflow:hidden}.image{background:#ddd;height:200px}.content{padding:16px}.message{font-size:16px;line-height:1.5}.meta{color:#999;font-size:12px}