:root{--gc-primary: #1a1a2e;--gc-primary-hover: #2a2a44;--gc-secondary: #6c727f;--gc-secondary-hover: #565b66;--gc-bg: #f4f5f7;--gc-surface: #ffffff;--gc-border: #d9dce1;--gc-text: #1a1a2e;--gc-error: #c0392b;--gc-radius: 10px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--gc-bg);color:var(--gc-text)}.gc-page{min-height:100vh;display:flex;align-items:flex-start;justify-content:center;padding:48px 16px}.gc-checkout{width:100%;max-width:420px;background:var(--gc-surface);border:1px solid var(--gc-border);border-radius:var(--gc-radius);padding:28px;box-shadow:0 6px 24px #0000000f;display:flex;flex-direction:column;gap:14px}.gc-logo{max-height:40px;align-self:flex-start}.gc-summary{font-size:1.25rem;font-weight:600}.gc-notice{font-size:.9rem;color:var(--gc-secondary);line-height:1.4}.gc-mock-note{background:#fff7e6;border:1px solid #ffe1a8;color:#8a6d1f;padding:8px 10px;border-radius:8px}.gc-field{display:flex;flex-direction:column;gap:4px}.gc-field-label{font-size:.8rem;color:var(--gc-secondary)}.gc-input{padding:10px 12px;border:1px solid var(--gc-border);border-radius:8px;font-size:1rem;width:100%}.gc-input:focus{outline:none;border-color:var(--gc-primary);box-shadow:0 0 0 3px #1a1a2e1f}.gc-secure-field{height:42px;padding:0 12px;display:flex;align-items:center}.gc-secure-field.focus{border-color:var(--gc-primary);box-shadow:0 0 0 3px #1a1a2e1f}.gc-row{display:flex;gap:10px}.gc-row .gc-field{flex:1}.gc-error{color:var(--gc-error);font-size:.85rem;min-height:1em}.gc-error:empty{display:none}.gc-pay{margin-top:6px;padding:12px 16px;border:none;border-radius:8px;background:var(--gc-primary);color:#fff;font-size:1rem;font-weight:600;cursor:pointer;transition:background .15s ease}.gc-pay:hover:not(:disabled){background:var(--gc-primary-hover)}.gc-pay:disabled{opacity:.6;cursor:not-allowed}.gc-fatal{max-width:420px;background:var(--gc-surface);border:1px solid var(--gc-border);border-radius:var(--gc-radius);padding:24px;color:var(--gc-error)}