* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.login-wrapper { display: flex; align-items: center; justify-content: center; height: 100%; }
.login-card { background: #fff; width: 100%; max-width: 380px; padding: 40px 35px; border-radius: 12px; box-shadow: 0 15px 35px rgba(0, 0, 0, .2); }
.login-card h2 { text-align: center; margin-bottom: 25px; font-weight: 500; color: #333; }
.form-group { margin-bottom: 18px; }
.form-group input { width: 100%; padding: 12px 15px; border: 1px solid #ddd; border-radius: 6px; font-size: 14px; transition: border-color .2s; }
.form-group input:focus { outline: none; border-color: #667eea; }
.form-group button { width: 100%; padding: 12px; border: none; border-radius: 6px; background: #667eea; color: #fff; font-size: 15px; cursor: pointer; transition: background .2s; }
.form-group button:hover { background: #5a67d8; }
.error-tip { color: #e74c3c; font-size: 13px; text-align: center; margin-bottom: 15px; }
.login-links { text-align: center; font-size: 13px; }
.login-links a { color: #667eea; text-decoration: none; }
.login-links a:hover { text-decoration: underline; }