*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f7f5f0;color:#1a1a1a}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1a1a1a,#2d2416)}.login-card{background:#fff;border-radius:16px;padding:48px 40px;width:100%;max-width:400px;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.3)}.login-logo{font-size:48px;margin-bottom:16px;color:#c9a84c}.login-title{font-size:24px;font-weight:700;margin-bottom:8px}.login-sub{color:#666;margin-bottom:32px;font-size:14px}.error-msg{color:#e53e3e;font-size:13px;margin:-8px 0 12px}.app{min-height:100vh}.header{background:#1a1a1a;color:#fff;padding:0 24px}.header-inner{max-width:860px;margin:0 auto;justify-content:space-between;height:60px}.header-brand,.header-inner{display:flex;align-items:center}.header-brand{gap:10px}.brand-icon{color:#c9a84c;font-size:20px}.brand-name{font-weight:600;font-size:16px;letter-spacing:.3px}.main{max-width:860px;margin:32px auto;padding:0 24px;display:flex;flex-direction:column;gap:24px}.card{background:#fff;border-radius:12px;padding:32px;box-shadow:0 1px 4px rgba(0,0,0,.08)}.card-slim{padding:24px}.card-header{margin-bottom:28px}.card-title{font-size:18px;font-weight:700;margin-bottom:4px}.card-sub{color:#666;font-size:13px}.card-footer{display:flex;align-items:center;justify-content:flex-end;gap:16px;margin-top:28px;border-top:1px solid #f0ece4;padding-top:24px}.rates-grid{display:grid;grid-template-columns:1fr;grid-gap:16px;gap:16px;max-width:320px}.rate-item{background:#fdf9f0;border:1px solid #f0e8d0;border-radius:10px;padding:16px 20px}.rate-label{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px}.rate-karat{font-weight:600;font-size:15px}.rate-purity{color:#999;font-size:12px}.rate-input-wrap{display:flex;align-items:center;gap:8px}.rate-symbol{color:#c9a84c}.rate-input,.rate-symbol{font-size:16px;font-weight:600}.rate-input{flex:1 1;border:1px solid #e0d8c8;border-radius:6px;padding:8px 12px;background:#fff;outline:none;transition:border-color .2s}.rate-input:focus{border-color:#c9a84c}.rate-unit{color:#999;font-size:13px}.gst-row{margin-top:16px;background:#f5f5f5;border:1px solid #e8e8e8;border-radius:10px;padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:20px}.input{width:100%;padding:12px 16px;border:1px solid #e0e0e0;border-radius:8px;font-size:15px;margin-bottom:16px;outline:none}.input:focus{border-color:#c9a84c}.btn-primary{background:#1a1a1a;color:#fff;border:none;border-radius:8px;padding:12px 24px;font-size:14px;font-weight:600;cursor:pointer;transition:background .2s;width:100%}.btn-primary:hover:not(:disabled){background:#333}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:transparent;color:#aaa;border:1px solid #444;border-radius:6px;padding:6px 14px;font-size:13px;cursor:pointer}.btn-ghost:hover{color:#fff;border-color:#888}.btn-update{width:100%;padding:16px;background:linear-gradient(135deg,#c9a84c,#a8832a);color:#fff;border:none;border-radius:10px;font-size:16px;font-weight:700;cursor:pointer;letter-spacing:.3px;transition:opacity .2s}.btn-update:hover:not(:disabled){opacity:.9}.btn-update:disabled{opacity:.6;cursor:not-allowed}.formula-box{background:#f7f5f0;border-left:3px solid #c9a84c;border-radius:6px;padding:16px 20px;margin-bottom:24px}.formula-title{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.8px;color:#999;margin-bottom:10px}.formula-text{font-size:14px;line-height:2;color:#333}.formula-note{margin-top:12px;font-size:12px;color:#999}.progress-section{margin-top:24px}.progress-bar-wrap{height:6px;background:#f0ece4;border-radius:99px;overflow:hidden;margin-bottom:8px}.progress-bar{height:100%;background:linear-gradient(90deg,#c9a84c,#a8832a);border-radius:99px;transition:width .3s}.progress-stats{display:flex;gap:16px;font-size:12px;color:#666;margin-bottom:16px}.log-box{background:#1a1a1a;border-radius:8px;padding:16px;max-height:260px;overflow-y:auto;font-family:monospace;font-size:13px}.log-line{padding:2px 0}.log-success{color:#68d391}.log-skip{color:#a0aec0}.log-error{color:#fc8181}.log-info{color:#63b3ed}.log-done{color:#f6e05e;font-weight:700}.ref-table{width:100%;border-collapse:collapse;font-size:13px;margin-top:12px}.ref-table th{text-align:left;padding:8px 12px;background:#f7f5f0;font-weight:600;color:#666;font-size:11px;text-transform:uppercase;letter-spacing:.5px}.ref-table td{padding:8px 12px;border-top:1px solid #f0ece4;color:#444;font-family:monospace}.ref-table tr:first-child td{border-top:none}.msg-success{color:#38a169}.msg-error,.msg-success{font-size:13px;font-weight:600}.msg-error{color:#e53e3e}@media (max-width:600px){.main{padding:0 16px;margin:16px auto}.card{padding:20px}.rates-grid{grid-template-columns:1fr}.gst-row{flex-direction:column;align-items:flex-start}}