:root{--background:#f0f2f5;--foreground:#1c1e21;--primary:#0056b3;--primary-hover:#004494;--surface:#fff;--surface-border:#ccd0d5;--input-bg:#fff;--input-border:#ccd0d5;--success:#28a745;--font-sans:Arial, Helvetica, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--background);color:var(--foreground);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;flex-direction:column;min-height:100vh;display:flex}.container{width:100%;max-width:800px;margin:0 auto;padding:20px}.card{background:var(--surface);border:1px solid var(--surface-border);border-radius:8px;padding:20px;box-shadow:0 1px 2px #0000000d}.input-field{background:var(--input-bg);border:1px solid var(--input-border);width:100%;color:var(--foreground);border-radius:4px;outline:none;margin-bottom:12px;padding:10px 12px;font-size:14px}.input-field:focus{border-color:var(--primary);box-shadow:0 0 0 2px #0056b333}.btn-primary{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:4px;padding:10px 20px;font-size:14px;font-weight:700}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:disabled{opacity:.7;cursor:not-allowed}@media (max-width:768px){.container,.card{padding:15px}.home-header h1{font-size:32px!important}.home-header p{font-size:16px!important}.post-title{font-size:18px!important}.post-card{padding:16px 0}}